KR100858924B1 - Supported catalyst for producing hydrogen gas by steam reforming reaction of liquefied natural gas, method for preparing the supported catalyst and method for producing hydrogen gas using the supported catalyst - Google Patents

Abstract

The present invention relates to a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas, a method for producing the same, and a method for producing hydrogen gas using the supported catalyst, and more particularly, to alumina and a surface of the alumina alumina-zirconia composite oxide carriers comprising grafted) zirconia; And a supported catalyst for producing hydrogen gas by steam reforming of a liquefied natural gas containing a catalyst metal supported on the composite oxide support, a method for preparing the same, and a method for producing hydrogen gas using the supported catalyst.

According to the present invention, hydrogen gas can be produced by steam reforming of liquefied natural gas consisting of a relatively inexpensive mixed gas of methane and ethane, rather than steam reforming of pure methane. In addition, it shows high reaction activity and can be manufactured at a lower production cost than the conventional high active noble metal catalyst, and its hydrogen content is reduced by the steam reforming reaction of liquefied natural gas with excellent reproducibility. A supported catalyst for producing gas, a method for producing the same, and a method for producing hydrogen gas using the supported catalyst can be provided.

Alumina-zirconia composite oxide, grafting mathod, supported catalyst, liquefied natural gas, steam reforming reaction, hydrogen production

Description

Supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas, method for preparing the same, and method for producing hydrogen gas using the supported catalyst {Supported catalyst for producing hydrogen gas by steam reforming reaction of liquefied natural gas, method for preparing the supported catalyst and method for producing hydrogen gas using the supported catalyst}

1 shows commercially available X-ray diffraction analysis results of Al ₂ O ₃ -ZrO ₂ -1 and Al ₂ O ₃ -ZrO ₂ -2, which are alumina-zirconia composite oxide carriers prepared according to Preparation Examples 1 and ₂ . It is a figure compared with the result of X-ray diffraction analysis of commercial alumina.

2 is a supported catalyst prepared according to Preparation Examples 3 and 4 (20Ni / Al ₂ O ₃ -ZrO ₂ -1 and 20Ni / Al ₂ O ₃ -ZrO ₂ -2) and a supported catalyst prepared according to Comparative Example 1 ( 20 Ni / Al ₂ O ₃ ) is a view showing a comparison of the X-ray diffraction analysis results.

3 is a supported catalyst prepared according to Preparation Examples 3 and 4 (20Ni / Al ₂ O ₃ -ZrO ₂ -1 and 20Ni / Al ₂ O ₃ -ZrO ₂ -2) and a supported catalyst prepared according to Comparative Example 1 ( X-ray diffraction analysis obtained after reduction of 20Ni / Al ₂ O ₃ ) at 800 ^° C. for 3 hours using a mixed gas of nitrogen (30 ml / min) and hydrogen (10 ml / min). Drawing.

4 is a schematic diagram of a reactor for performing hydrogen production reaction by steam reforming reaction of liquefied natural gas composed of methane and ethane mixed gas using three supported catalysts according to Preparation Examples 3, 4 and Comparative Example 1; .

5 is a graph showing a change in liquefied natural gas conversion rate of the catalyst according to Examples 1 and 2 according to the reaction time at 600 ℃.

6 is a hydrogen production reaction by steam reforming of liquefied natural gas according to the method of Example 1 using a 20Ni / Al ₂ O ₃ -ZrO ₂ -2 catalyst prepared according to Preparation Example 4 and reacted at 600 ° C. It is a graph showing the change in catalytic activity over time.

The present invention relates to a supported catalyst for producing hydrogen gas by the steam reforming reaction of liquefied natural gas, a method for producing the same, and a method for producing hydrogen gas using the supported catalyst, and more particularly, not only exhibits high reaction activity, A supported catalyst for producing hydrogen gas by the steam reforming reaction of liquefied natural gas with excellent reproducibility due to its low constituents and a synthetic route, which has a simple manufacturing cost compared to a highly active noble metal catalyst, a manufacturing method and the supported catalyst It relates to a hydrogen gas production method using.

A fuel cell is a power generation system that converts chemical energy of hydrogen and oxygen directly into electrical energy contained in hydrocarbon-based materials such as methanol, ethanol and natural gas. (stack), fuel processor (FP), fuel tank, fuel pump and the like. The fuel cell stack forms a main body of the fuel cell, and has a structure in which a plurality of unit cells consisting of a membrane electrode assembly (MEA) and a separator (separator or bipolar plate) are stacked in a few to several tens, and the fuel pump has a fuel tank. The internal fuel is supplied to the fuel processing apparatus, and the fuel processing apparatus reforms and purifies the fuel to generate hydrogen, and supplies the hydrogen to the fuel cell stack.

Hydrogen gas, which is used as an energy source for fuel cells and attracts attention as a next-generation energy source, is continuously recognized for its importance due to research results and market expansion in the fuel cell field. As for the production of hydrogen gas supplied to fuel cells, studies are being actively conducted based on petroleum hydrocarbons such as methanol or methane. Especially, liquefied natural gas (LNG) based on methane is hydrogen for fuel cell. It is known as a suitable raw material for producing gas, because liquefied natural gas has a lot of reserves in the world, but mainly composed of lower gas such as methane and ethane, so it does not show great utility value or added value except for heating purpose.

In general, reforming reactions are used to produce hydrogen from petroleum hydrocarbons such as liquefied natural gas, and known reforming reactions include steam reforming, depending on the type of material used as a reactant with hydrocarbons. Auto-thermal reforming, partial oxidation and CO ₂ reforming. Among these reforming reactions, steam reforming reaction and autothermal reforming reaction, which are relatively excellent in hydrogen yield, are mainly used for hydrogen production for fuel cells.

In the case of the autothermal reforming reaction, hydrocarbon, steam and oxygen are used together as reactants. Since the reaction shows a thermodynamic weak endothermic characteristic compared to steam reforming reaction using hydrocarbons and steam as reactants, heat is applied to the reformer for fuel cell. Supplying is not a big problem. However, the autothermal reforming reaction has a lower ratio of hydrogen / carbon monoxide in the product, a lower hydrogen yield, and a relatively complicated reaction path due to the use of oxygen as a reactant, and it is difficult to use commercially due to many byproducts. many.

In contrast, the reaction of producing hydrogen through steam reforming using liquefied natural gas has a high commercial value in hydrogen production for fuel cells, which is not only methane but also methane, the main component of liquefied natural gas. This is because the mixed gas of and ethane can be directly converted to hydrogen by steam reforming reaction, and the urban natural gas pipe can produce hydrogen gas for use in a small domestic fuel cell. The steam reforming reaction of liquefied natural gas is a reaction in which methane and ethane, the main constituents of liquefied natural gas, react with steam to produce carbon monoxide and carbon dioxide in addition to hydrogen, the main product, and the reactant water vapor / carbon ratio, reaction temperature, and catalyst used. Since the yield of the product can be adjusted, the reactivity can be adjusted according to desired purposes such as hydrogen gas production for fuel cells or synthesis gas production.

Meanwhile, in a commercial process for producing hydrogen gas for fuel cells, a nickel catalyst supported on α-alumina is generally used under reaction conditions in which the ratio of water vapor / carbon, which is a reactant, is 3 to 5 or more and the reaction temperature is 800 ° C. or more. Hydrogen is produced by steam reforming reaction. However, such a commercial steam reforming reaction requires a high reaction temperature and because a large amount of water must be vaporized with water vapor, there is an economic problem in terms of heat supply, and there is a problem that the deactivation of the nickel catalyst supported on the alumina is serious [J . Sehested, Catal. Today, vol. 111, 103 (2006)]. Therefore, in the steam reforming reaction, the ratio of the water vapor / carbon as a reactant and the reaction temperature are lowered, thereby reducing the hydrogen yield and the catalyst deactivation problem. Thus, a catalyst having a high ratio of hydrogen / carbon monoxide in the product, that is, a high selectivity of hydrogen is selected. Developing is the most important task.

To date, catalysts used for steam reforming of methane include, depending on the supported main catalyst metals, catalysts of precious metals such as ruthenium or rhodium, alkaline earth metals or lanthanide elements such as calcium, magnesium, lanthanum, cerium and ytterbium, in addition to nickel. And catalysts using as a cocatalyst have been disclosed, and zirconia, silica, silica-zirconia, ceria-zirconia, alumina-ceria-zirconia, and the like have been disclosed as carriers. Particularly, in the case of ceria or zirconia carriers, the adsorption of water vapor to the catalyst surface in the steam reforming reaction is enhanced to induce easy gasification of the hydrocarbon adsorbed on the catalyst surface, resulting in a positive conversion of the hydrocarbon and the hydrogen yield. At the same time, it is known to significantly reduce the catalyst deactivation factors such as carbon deposition and sintering, which are problems of the nickel catalyst supported on alumina. However, the direct use of zirconia itself as a carrier causes a problem that the price competitiveness is significantly lower than that of the alumina carrier, and that thermal stability and mechanical stability are poor.

As described above, in the case of a catalyst used for steam reforming of methane, various studies have been conducted on main catalysts, cocatalysts, and carriers, but steam reforming reactions of liquefied natural gas containing methane and ethane as main components have been conducted. No in-depth research has yet been conducted and the optimal catalyst system that can be used for this reaction has not been clearly presented.

The present invention intends to produce hydrogen gas by steam reforming of liquefied natural gas consisting of a relatively inexpensive mixed gas of methane and ethane, rather than steam reforming of pure methane.

Accordingly, the first technical problem to be achieved by the present invention is to improve the problems of the nickel catalyst catalyst supported on the α-alumina which is widely used commercially while retaining the advantages of the zirconia carrier, reaction activity, catalyst stability, economical And a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas having excellent characteristics in mass productivity and the like.

In addition, a second technical problem to be achieved by the present invention is to provide a method for preparing a supported catalyst for producing hydrogen gas by steam reforming of the liquefied natural gas.

Finally, a third technical problem to be achieved by the present invention is to provide a hydrogen gas production method using a supported catalyst for producing hydrogen gas by the steam reforming reaction of the liquefied natural gas.

The present invention to achieve the first technical problem,

An alumina-zirconia composite oxide carrier comprising alumina and zirconia grafted on the surface of the alumina; And

Provided is a supported catalyst for producing hydrogen gas by steam reforming of a liquefied natural gas containing a catalyst metal supported on the composite oxide support.

According to a preferred embodiment of the present invention, the alumina-zirconia composite oxide carrier may include 1 to 50 parts by weight of the zirconia with respect to 100 parts by weight of the alumina.

According to another preferred embodiment of the present invention, the catalyst metal is Pt, Au, Pd, Rh, La, Ce, Yb, Ni, Cu, Ag, Ru, Ir, Os, Au, Co, V, Fe, Sn, Ca, Mg or mixtures thereof.

According to another preferred embodiment of the present invention, the catalyst metal may be supported in an amount of 1 to 50 parts by weight based on 100 parts by weight of the composite oxide carrier.

According to another preferred embodiment of the present invention, the specific surface area of the composite oxide carrier may be 50 m ² / g to 300 m ² / g.

According to another preferred embodiment of the present invention, the average particle diameter of the catalyst metal may be 2 to 50 nm.

In addition, the present invention to achieve the second technical problem,

a) dispersing the alumina powder in an organic solvent and then adding a basic catalyst to activate the surface of the alumina powder;

b) adding and reacting a zirconium precursor to the alumina powder;

c) preparing a slurry by washing the reaction product of step b) with an organic solvent;

d) performing hydration and condensation by adding distilled water to the slurry;

e) filtering the reaction product of step d), drying and heat treating the filtrate to prepare an alumina-zirconia composite oxide carrier;

f) mixing the alumina-zirconia composite oxide carrier and the catalyst metal precursor in a dispersion medium and uniformly mixing them; And

g) It provides a method for producing a supported catalyst for producing hydrogen gas by the steam reforming reaction of liquefied natural gas comprising the step of drying and heat treatment the mixture.

According to a preferred embodiment of the present invention, the organic solvent of the a) and c) step is toluene, 2-butanol, benzene, ethylbenzene, trimethylbenzene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, ethyl acetate And butyl acetate, n-hexane, isopropyl alcohol, trichloroethylene, 1,1,1-trichloroethane, and at least one organic solvent selected from the group consisting of pentane.

According to another preferred embodiment of the present invention, the basic catalyst is ethylamine, diethylamine, triethylamine, trimethylamine, N-methylpyrrolidine, pyridine, 4- (N, N-dimethylamino) pyridine, 4 At least one basic catalyst selected from the group consisting of-(N, N-diethylamino) pyridine, N, N-dimethylformamide and 1-methyl-2-pyrrolidone.

According to another preferred embodiment of the present invention, the amount of the alumina powder and the basic catalyst added in step a) may be 1 to 5 parts by weight and 0.1 to 3 parts by weight based on 100 parts by weight of the organic solvent, respectively.

According to another preferred embodiment of the present invention, step a) may be performed for 0.5 hours to 3 hours at a temperature of 10 ℃ to 80 ℃.

According to another preferred embodiment of the present invention, step b) may be performed by adding 1 to 50 parts by weight of zirconium precursor based on 100 parts by weight of the alumina powder.

According to another preferred embodiment of the present invention, the step b) is for 3 to 10 hours at a temperature of 10 ℃ to 80 ℃ while adding and stirring the zirconium precursor at a rate of 0.01 g / min to 0.1 g / min Can be performed.

According to another preferred embodiment of the present invention, the zirconium precursor is zirconium butoxide (zirconium butoxide), zirconium propoxide, zirconium tert-butoxide (zirconium tert-butoxide), zirconium isopropoxide Zirconium alkoxide selected from the group consisting of zirconium isopropoxide and mixtures thereof.

According to another preferred embodiment of the present invention, step c) may be performed once to five times.

According to another preferred embodiment of the present invention, the hydration and condensation reaction of step d) is added 1 to 20 parts by weight of the slurry relative to 100 parts by weight of the distilled water, 3 to 10 hours at a temperature of 10 ℃ to 80 ℃ Can be carried out by reaction.

According to another preferred embodiment of the present invention, the drying of the steps e) and g) is carried out for 1 to 10 hours at a temperature of 70 ℃ to 200 ℃, heat treatment 3 to 10 at a temperature of 400 ℃ to 800 ℃ May be performed for a time.

According to another preferred embodiment of the present invention, step f) may be performed by adding 1 to 50 parts by weight of the catalyst metal precursor with respect to 100 parts by weight of the alumina-zirconia composite oxide carrier.

According to another preferred embodiment of the present invention, the dispersion medium of step f) is water; One or more alcoholic solvents selected from the group consisting of methanol, ethanol, isopropyl alcohol and butyl alcohol; Or mixtures thereof.

Finally, the present invention to achieve the third technical problem,

Pretreatment by flowing nitrogen and hydrogen mixed gas while maintaining the surface temperature of the supported catalyst for producing hydrogen gas by the steam reforming reaction of the liquefied natural gas at 500 ° C to 900 ° C; And

2,000 ml / h · g-catalyst to 30,000 ml / h · of liquefied natural gas and water vapor containing methane gas and ethane gas while maintaining a reaction temperature of 500 ° C. to 900 ° C. on the surface of the pre-treated supported catalyst. It provides a method for producing hydrogen gas comprising the step of flowing at the space velocity of the g-catalyst.

According to a preferred embodiment of the present invention, the hydrogen / nitrogen mixing volume ratio of the nitrogen and hydrogen mixed gas may be 0.01 to 0.3.

According to another preferred embodiment of the present invention, the pretreatment time may be 2 to 8 hours.

According to another preferred embodiment of the present invention, the mixed volume ratio of the liquefied natural gas and water vapor may be 1 to 10.

According to another preferred embodiment of the present invention, the liquefied natural gas methane gas / ethane gas mixing volume ratio may be 99.9 to 9.

Hereinafter, the present invention will be described in more detail.

In the present invention, using a liquefied natural gas consisting of a relatively inexpensive mixture of methane and ethane as a raw material rather than the steam reforming reaction of pure methane as a raw material without a separate separation process by using a steam reforming reaction to achieve high hydrocarbon conversion and hydrogen yield while hydrogen gas In order to prepare, and to overcome the conventional problems by using a carrier having excellent economic, thermal stability or mechanical stability compared to the existing carrier.

In the method for producing hydrogen gas by steam reforming of liquefied natural gas, hydrocarbons and steam as reactants are adsorbed onto a metal catalyst or carrier to generate hydrogen, carbon monoxide and carbon dioxide as a result. It is influenced by the size of the active catalyst metal particles and the distribution state of the metal phase present on the carrier by the action, and as a result, the reactivity of the catalyst is greatly influenced by the type of the carrier. The catalyst metal supported on the alumina-zirconia composite oxide carrier prepared according to the present invention causes a metal-carrier interaction different from that of the catalyst metal supported by a common impregnation method such as alumina, which is a commercial carrier. In the steam reforming of the liquefied natural gas comprising a, it is possible to significantly improve the reactivity and hydrogen yield of the hydrocarbon.

In more detail, the supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas according to the present invention has a form in which a catalyst metal is supported on an alumina-zirconia composite oxide carrier, and the alumina-zirconia composite oxide carrier It is manufactured through the modification process of grafting zirconia on the surface of commercial alumina by the grafting method, and has a higher ratio of tetragonal phase in the crystal structure compared to a normal pure zirconia carrier. Have That is, conventional pure zirconia carriers have a monoclinic phase thermally more stable than a tetragonal phase when subjected to high temperature heat treatment, so that a monoclinic phase dominates in the crystal structure. According to the alumina-zirconia composite oxide support, the tetragonal phase occupies most of the crystal structure despite the high temperature heat treatment. This may be due to the stabilization phenomenon of the zirconia tetragonal system due to the surface interaction between the alumina component and the zirconia component.

Thus, according to the present invention, while maintaining the advantages such as high hydrocarbon conversion, high hydrogen yield and catalyst deactivation suppression of the zirconia carrier, it is possible to provide a new composite oxide carrier which can compensate for the disadvantages such as economical efficiency, thermal stability and mechanical stability. It becomes possible.

In the alumina-zirconia composite oxide support, the content of alumina and zirconia in the support is preferably 1 to 50 parts by weight of the zirconia, more preferably 10 to 35 parts by weight, and 10 to 25 parts by weight based on 100 parts by weight of alumina. Even more preferable, but if the content of zirconia is less than 1 part by weight, it is not preferable because there is a problem that can not sufficiently retain the advantages of zirconia, that is, there may be problems such as reduced hydrocarbon conversion, reduced hydrogen yield and catalyst deactivation, 50 weight In the case where the amount is exceeded, the disadvantage of zirconia by alumina may not be sufficiently compensated for, that is, it is not economical and thermally and mechanically unstable.

The supported catalyst according to the present invention may be prepared by supporting a catalyst metal for catalyzing the hydrogenation reaction of a hydrocarbon on the alumina-zirconia composite oxide support, and as such a catalyst metal, a catalyst metal commonly used in the hydrogenation reaction in the art. As non-limiting examples, Pt, Au, Pd, Rh, La, Ce, Yb, Ni, Cu, Ag, Ru, Ir, Os, Au, Co, V, Fe, Sn, Ca, Mg or mixtures thereof Various catalytic metals such as and the like can be used.

The amount of the catalyst metal supported on the support is preferably 1 to 50 parts by weight, more preferably 10 to 35 parts by weight based on 100 parts by weight of the composite oxide carrier, and the amount of the catalyst metal to be supported is less than 1 part by weight. In this case, it is not preferable because there is a problem in that it cannot exhibit sufficient catalytic activity, and in the case of exceeding 50 parts by weight, it is not preferable because there is a disadvantage in terms of economically disadvantageous effect of increasing the catalytic activity that can be reaped compared to the amount of the supported catalyst.

On the other hand, in the supported catalyst according to the present invention, the specific surface area of the composite oxide carrier is 50 m ² / g to 300 m ² / g, which can induce a smooth dispersion of the supported catalyst metal to ensure sufficient catalytic activity In addition, it ensures that the supported catalyst has acceptable mechanical properties and has thermally stable properties even at high temperatures.

The average particle diameter of the catalyst metal is preferably 2 to 50 nm. If the average particle diameter is less than 2 nm, the size of the catalyst metal particles is too small to show sufficient catalytic activity. This is because there is a problem in that the catalytic activity is deteriorated due to the aggregation of.

The present invention also to achieve the above other technical problem,

a) dispersing the alumina powder in an organic solvent and then adding a basic catalyst to activate the surface of the alumina powder; b) adding and reacting a zirconium precursor to the alumina powder; c) preparing a slurry by washing the reaction product of step b) with an organic solvent; d) adding the slurry to distilled water to perform a hydration and condensation reaction; e) filtering the reaction product of step d), drying and heat treating the filtrate to prepare an alumina-zirconia composite oxide carrier; f) mixing the alumina-zirconia composite oxide carrier and the catalyst metal precursor in a dispersion medium and uniformly mixing them; And g) provides a method for producing a supported catalyst for producing hydrogen gas by the steam reforming reaction of liquefied natural gas comprising the step of drying and heat treatment the mixture.

First, in the preparation method of the supported catalyst according to the present invention, the alumina powder is dispersed in an organic solvent and the surface of the alumina powder is activated by a basic catalyst.

The organic solvent is not particularly limited as long as it can smoothly disperse alumina, and non-limiting examples thereof include toluene, 2-butanol, benzene, ethylbenzene, trimethylbenzene, xylene, methylethyl ketone, methyl isobutyl ketone, and acetone. And one or more organic solvents selected from the group consisting of ethyl acetate, butyl acetate, n-hexane, isopropyl alcohol, trichloroethylene, 1,1,1-trichloroethane and pentane.

The basic catalyst serves to activate the surface of the alumina to facilitate grafting with zirconia added in a later step. Non-limiting examples include ethylamine, diethylamine, triethylamine, trimethylamine, N-methylpyrrolidine, pyridine, 4- (N, N-dimethylamino) pyridine, 4- (N, N-diethylamino) pyridine, N, N-dimethylformamide and 1-methyl-2-pyrroli And at least one basic catalyst selected from the group consisting of pigs.

The addition amount of the alumina powder and the basic catalyst of the step a) is preferably 1 to 5 parts by weight and 0.1 to 3 parts by weight with respect to 100 parts by weight of the organic solvent, respectively, and the content of the alumina powder is less than or within the above range. If it exceeds, there may be a problem that the activation of the surface of the alumina powder is not performed smoothly. In addition, when the content of the basic catalyst is less than the above range, there is a problem that the grafting between alumina and zirconia cannot be performed smoothly because the activation of the surface of the alumina powder is not performed smoothly. It is not desirable because there is a problem that can form adverse conditions.

On the other hand, the dispersion process of step a) may be performed for 0.5 hours to 3 hours at a temperature of 10 ℃ to 80 ℃ using a conventional stirrer, such as a magnetic stirrer.

Subsequently, a zirconium precursor is added to the active alumina dispersion of step a) to perform a grafting reaction between alumina and zirconia, wherein the amount of the zirconium precursor is added based on 100 parts by weight of the alumina powder. It is preferably from 50 parts by weight, more preferably from 10 to 35 parts by weight, even more preferably from 10 to 25 parts by weight.

It should be noted that in step b), the zirconium precursor has a high hydration rate, and thus it is necessary to slowly and repeatedly add a small amount of the zirconium precursor to the hydration rate. This is because the zirconium precursor can be relatively uniformly grafted on the surface of the alumina by injecting it slowly while minimizing the exposure in the air. Therefore, in step b), the zirconium precursor is preferably added and stirred at a rate of 0.01 g / min to 0.1 g / min, and in order to ensure a sufficient reaction, the reaction temperature and time are 10 ° C. to 80 ° C. and It is preferable that it is 3 to 10 hours, More preferably, it is 6 to 10 hours.

The zirconium precursor includes, but is not limited to, zirconium butoxide, zirconium propoxide, zirconium tert-butoxide, zirconium isopropoxide Zirconium alkoxides selected from the group consisting of

Next, after step b), a washing process for removing unbound zirconium precursor remaining in the reaction solution is to be performed, and the washing process is performed once to 5 times considering the balance between sufficient washing and shortening of the overall reaction time. Can be performed repeatedly. The organic solvent used in the washing process may be the same as or different from the organic solvent used in step a).

The washing process is a step of preparing a slurry for carrying out the hydration and condensation reaction carried out in step d), and when the washing is completed by adding distilled water to the slurry to perform the hydration and condensation reaction, zirconia on the surface of alumina It will be grafted in the form of. At this time, the content ratio of the slurry and distilled water suitable for the hydration and condensation reaction is 1 to 10 parts by weight of the slurry with respect to 100 parts by weight of the distilled water, the reaction temperature and time is 10 ℃ to 80 ℃ and 3 to 10 hours, preferably It can be 6 to 10 hours.

Subsequently, as a final step for preparing the composite oxide carrier, the reaction product of the hydration and condensation reaction is filtered using a vacuum filter to obtain a solid component, and then the filtrate is dried and heat treated. . At this time, the drying is carried out for 1 to 10 hours, preferably 3 to 5 hours at a temperature of 70 ℃ to 200 ℃, preferably 100 ℃ to 150 ℃, heat treatment 400 ℃ to 800 ℃, preferably 600 It may be carried out for 3 to 10 hours, more preferably 5 to 8 hours at a temperature of ℃ to 800 ℃, more preferably 700 ℃ to 800 ℃, drying may be carried out in a vacuum condition or in an oven have.

By supporting the catalyst metal on the alumina-zirconia composite oxide carrier prepared by the above steps a) to e), it is possible to prepare a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas according to the present invention. The supporting process of the metal may be carried out by placing the carrier and the catalyst metal precursor in a dispersion medium, mixing them uniformly, and drying and heat treating the resultant.

At this time, in order to obtain the catalyst metal content as described above, it is preferable to add 1 to 50 parts by weight of the catalyst metal precursor, and more preferably 10 to 35 parts by weight based on 100 parts by weight of the alumina-zirconia composite oxide carrier. Do. As a dispersion medium, water, an alcoholic solvent or a mixture thereof may be used, and as the alcoholic solvent, one or more selected from the group consisting of methanol, ethanol, isopropyl alcohol, and butyl alcohol may be used.

Meanwhile, the catalyst metal precursor may be Pt, Au, Pd, Rh, La, Ce, Yb, Ni, Cu, Ag, Ru, Ir, Os, Au, Co, V, Fe, Sn, Ca, Mg, or Various precursors can be used to support the mixture as catalyst metal. For example, if the catalyst metal is nickel, nickel nitrate hexahydrate, nickel chloride hexahydrate, nickel acetate tetrahydrate, nickel bromide hydrate Various nickel hydrates such as) may be used. In addition, when the catalytic metal is various metals such as platinum, ruthenium or gold, H ₂ PtCl ₄ , H ₂ PtCl ₆ , K ₂ PtCl ₄ , K ₂ PtCl ₆ , (NH ₄ ) ₂ [RuCl ₆ ], (NH ₄ ) Various precursors such as ₂ [RuCl ₅ H ₂ 0], H ₂ [AuCl ₄ ], (NH ₄ ) ₂ [AuCl ₄ ], H [Au (NO ₃ ) ₄ ] H ₂ O, and the like, may be used. Suitable precursors may be selected according to the type of metal to be supported.

Drying and heat treatment of the dispersion product of the carrier and the catalyst metal precursor may be carried out at the same temperature and time conditions as the drying and heat treatment of the filtrate of step e), the drying is 70 ℃ to 200 ℃, preferably 100 1 to 10 hours, preferably 3 to 5 hours at a temperature of ℃ to 150 ℃, heat treatment is 400 ℃ to 800 ℃, preferably 600 ℃ to 800 ℃, more preferably of 700 ℃ to 800 ℃ The temperature may be performed for 3 to 10 hours, more preferably for 5 to 8 hours. If the heat treatment temperature is lower than 400 ℃, the crystal structure of the catalyst is not well formed, if higher than 800 ℃ there is a problem that a metal phase with low catalytic activity is formed, if the baking time is less than 3 hours, the crystal structure of the catalyst is sufficiently formed If not more than 10 hours is unnecessary because there is a problem that the unnecessary time is consumed more economically disadvantageous. The firing atmosphere may also be an air atmosphere, and is not particularly limited.

Finally, the present invention to achieve the third technical problem,

Pretreatment by flowing a mixture of nitrogen and hydrogen while maintaining the surface temperature of the supported catalyst for producing hydrogen gas by the steam reforming reaction of the liquefied natural gas at 500 ° C to 900 ° C; And 2,000 ml / h · g-catalyst to 30,000 ml / h of liquefied natural gas and water vapor including methane gas and ethane gas while maintaining a reaction temperature of 500 ° C. to 900 ° C. on the surface of the pretreated supported catalyst. It provides a method for producing hydrogen gas comprising the step of flowing at the space velocity of the g-catalyst.

In the hydrogen gas production method according to the present invention, hydrogen gas can be produced by steam reforming reaction using the mixed gas itself as a raw material without a separate methane / ethane separation process. After pretreatment and reduction, the reaction may be carried out by flowing the reactant liquefied natural gas and water vapor to the surface of the catalyst layer at a suitable space velocity at a predetermined reaction temperature.

The reaction temperature of the pretreatment or reduction step and subsequent reaction temperature of the steam reforming reaction is preferably 500 ° C to 900 ° C, more preferably 600 ° C to 800 ° C, and even more preferably 700 ° C to 800 ° C, If the temperature is less than 500 ℃ has a problem that the conversion rate and the hydrogen yield of the liquefied natural gas is low, when the temperature exceeds 900 ℃ is not preferable because there is a problem that a safe and stable heat supply can not be made.

Another important measure for a smooth steam reforming reaction is the inflow rates of liquefied natural gas and water vapor, which are the space velocities of 2,000 ml / h · g-catalyst to 30,000 ml / h · g-catalyst. More preferably, from 2,000 ml / h-g-catalyst to 10,000 ml / h-g-catalyst, and more preferably from 2,000 ml / h-g-catalyst to 3,000 ml / h-g-catalyst Even more preferred. If the inflow rate is less than 2,000 ml / h-g-catalyst, it is inefficient considering that the supported catalyst according to the present invention has a high hydrocarbon conversion rate, and if the inflow rate exceeds 30,000 ml / h-g-catalyst, It is undesirable in that sufficient steam reforming may not be carried out to produce unreacted liquefied natural gas. At this time, in order to achieve a sufficient hydrocarbon conversion rate, the preferred mixing volume ratio of liquefied natural gas and water vapor is 1 to 10, more preferably 1 to 5, even more preferably 2 to 3. In addition, the methane gas / ethane gas mixing volume ratio of the liquefied natural gas is preferably 99.9 to 9, more preferably 15 to 9.

In addition, the volume ratio of the hydrogen / nitrogen mixture of the nitrogen and the hydrogen mixed gas flowing in the pretreatment step for the reduction of the catalytic metal is preferably 0.01 to 0.3, more preferably 0.1 to 0.3, and even more preferably 0.2 to 0.3. However, when the nitrogen gas is present in excess of the range of less than 0.01, the catalyst metal may not be sufficiently reduced. In the case where the hydrogen gas is present in excess of the range of 0.3, the catalyst may be reduced. There is a problem in sintering, which is not preferable. On the other hand, the pretreatment time is preferably from 2 to 8 hours, more preferably from 2 to 5 hours, even more preferably from 3 to 5 hours in order to achieve a proper balance of sufficient catalytic reduction and reaction time shortening.

In the actual steam reforming reaction, the inflow rate of steam and liquefied natural gas can be precisely controlled using a mass flow controller, and the steam can be supplied by vaporizing the liquid water at the same time using a syringe pump. At this time, the temperature of the portion where the liquid water is preheated can be maintained at 150 ℃ to 300 ℃, preferably 150 ℃ to 200 ℃, the water injected by the syringe pump is vaporized immediately with water vapor and liquefied natural gas and After sufficient mixing, it may be allowed to pass through the catalyst bed.

The supported catalyst according to the present invention is a part of a fuel processing apparatus that produces hydrogen from liquefied natural gas as a fuel reformer together with a desulfurization apparatus, a high temperature shift reaction apparatus, a low temperature shift reaction apparatus, and a PROX reaction apparatus and supplies the fuel cell to a fuel cell. You will be able to configure At this time, the desulfurization apparatus serves to remove sulfur compounds that poison the catalyst contained in the subsequent apparatus, and the high temperature shift reaction apparatus and the low temperature shift reaction apparatus serve to remove carbon monoxide poisoning the fuel cell catalyst layer. The proxy reactor is responsible for further reducing the concentration of carbon monoxide to less than 10 ppm.

Furthermore, the fuel processing apparatus will form an overall fuel cell system together with a fuel cell stack, and the fuel cell stack may be formed by stacking or arranging a plurality of unit fuel cells, wherein the unit fuel cell includes a cathode, an anode and It may include an electrolyte membrane positioned therebetween and further include a separator.

Hereinafter, the configuration and effects of the present invention will be described in more detail through specific preparation examples, examples, evaluation examples, and comparative examples, but these examples are only intended to more clearly understand the present invention, and thus, limit the scope of the present invention. It is not intended to be.

Preparation Example 1

Alumina in accordance with the present invention Zirconia  Complex oxide Carrier  Produce

Alumina was a commercially available γ-alumina of Degussa, and zirconium butoxide was used as a zirconium precursor. While stirring and stirring 0.6 ml of triethylamine (TEA) and 100 ml of toluene using a magnetic stirrer, 3 g of the γ-alumina was added onto the triethylamine-toluene mixed solution, followed by high dispersion, and at the same time the hydroxide on the surface of the alumina. The actual group was activated by triethylamine (TEA), which is a basic catalyst.

Thereafter, 2.4 g of zirconium butoxide (25% by weight of zirconium butoxide) was slowly injected into the mixed solution over 0.5 hours, and reacted for 6 hours with sufficient stirring using a magnetic stirrer. The zirconium precursor that was not grafted on the surface of the alumina in the reaction solution was repeatedly dissolved in toluene and removed by several washing processes using a centrifuge.

Subsequently, the slurry obtained after washing was dissolved in 100 ml of distilled water, followed by hydration and condensation for about 6 hours, and the solid obtained by filtration through a vacuum separator was dried for 3 hours in an oven at 120 ° C., and the dried solid was dried in an electric furnace under an air atmosphere. Alumina-zirconia composite oxide carrier grafted with zirconia on alumina was prepared by heat treatment at 5 ° C. for 5 hours. The carrier thus prepared was named Al ₂ O ₃ -ZrO ₂ -1.

Preparation Example 2

Alumina in accordance with the present invention Zirconia  Complex oxide Carrier  Produce

In order to increase the weight ratio of zirconia grafted to alumina, alumina-zirconia composite oxide carrier was prepared according to the preparation method of Preparation Example 1, but before the hydration and condensation reaction using distilled water, the washed slurry was subjected to 2-butanol. After washing once more with (2-Butanol), it was dissolved in 100 ml of 2-butanol and sufficiently stirred with a magnetic stirrer. Subsequently, when a small amount of distilled water (1 ml) is injected and reacted for about 6 hours, the butoxyl group (-OBu group) of the zirconium precursor grafted on alumina is converted into a hydroxyl group (-OH group).

The solution prepared by the above process was filtered using a vacuum separator, and the obtained solid was dried in an oven at 120 ° C. for 3 hours and calcined at 700 ° C. for 5 hours in an electric furnace. The solid sample obtained by sintering was prepared again according to the method of Preparation Example 1, and the zirconia was additionally bonded on the hydroxyl group which did not bond to the surface of alumina or the zirconia site which had already been bonded, and thus, compared with the case of Preparation Example 1 Alumina-zirconia carriers with increased zirconia content were prepared. The carrier thus prepared was named Al ₂ O ₃ -ZrO ₂ -2.

Preparation Examples 3 and 4

Preparation of Supported Catalysts According to the Present Invention

20 mass based on the mass of the carrier, using the alumina-zirconia composite oxide carrier prepared according to Preparation Example 1 (Al ₂ O ₃ -ZrO ₂ -1) and Preparation Example 2 (Al ₂ O ₃ -ZrO ₂ -2) % Nickel was supported by the impregnation method.

To this end, 0.996 g of nickel nitrate hexahydrate, a nickel precursor, was sufficiently dissolved in 1 ml of distilled water, and prepared in Example 1 (Al ₂ O ₃ -ZrO ₂ -1) and Preparation Example 2 (Al _2). 1 g of the alumina-zirconia composite oxide carrier prepared by O ₃ -ZrO ₂ -2) was added thereto, mixed well so that the aqueous nickel precursor solution was evenly dispersed on the surface of the carrier, and then dried at room temperature for 2 hours. The supported catalyst was dried in an oven at 24 ° C. for 24 hours, and the dried solid was heat-treated at 700 ° C. for 5 hours in an electric furnace to prepare a supported catalyst according to the present invention. The supported catalyst thus prepared was named 20Ni / Al ₂ O ₃ -ZrO ₂ -1 (Preparation Example 3) and 20Ni / Al ₂ O ₃ -ZrO ₂ -2 (Preparation Example 4), respectively.

Comparative Example 1

Preparation of Supported Catalysts According to the Prior Art (γ-alumina Supported  Nickel catalyst)

By the impregnation method, a supported catalyst carrying 20% by mass of nickel was prepared based on the mass of the carrier? -Alumina.

To this end, 0.996 g of nickel nitrate hexahydrate is sufficiently dissolved in 1 ml of distilled water, 1 g of commercially available γ-alumina of Degussa is added to this solution, and then an aqueous nickel precursor solution is evenly dispersed on the surface of the carrier. Mix well so that it was dried at room temperature for 2 hours. The supported catalyst was dried in an oven at 24 ° C. for 24 hours, and the dried solid was heat-treated at 700 ° C. for 5 hours in an electric furnace to prepare a supported catalyst according to the prior art. The supported catalyst thus prepared was named 20Ni / Al ₂ O ₃ .

Evaluation example 1

carrier  And Characterization of Supported Catalysts

1 shows commercially available X-ray diffraction analysis results of Al ₂ O ₃ -ZrO ₂ -1 and Al ₂ O ₃ -ZrO ₂ -2, which are alumina-zirconia composite oxide carriers prepared according to Preparation Examples 1 and ₂ . It is a figure compared with the result of X-ray diffraction analysis of commercial alumina.

In the case of Al ₂ O ₃ -ZrO ₂ -1 and Al ₂ O ₃ -ZrO ₂ -2 according to the present invention compared to the commercial γ-alumina, tetragonal phases of zirconia at 30 degrees, 34 degrees, 50 degrees and 60 degrees ( The tetragonal phase peak is well developed.

2 is a supported catalyst prepared according to Preparation Examples 3 and 4 (20Ni / Al ₂ O ₃ -ZrO ₂ -1 and 20Ni / Al ₂ O ₃ -ZrO ₂ -2) and a supported catalyst prepared according to Comparative Example 1 ( 20Ni / Al ₂ O ₃ ) is a view showing a comparison of the X-ray diffraction analysis results.

As shown in Figure 2, it can be seen that the supported catalyst according to the present invention has a nickel oxide species different from the supported catalyst prepared according to Comparative Example 1. The peak positions of the surface nickel oxide species that are relatively weakly bonded to the alumina-zirconia carrier, the surface nickel oxide species that are relatively strongly bonded, and the nickel-aluminate having a stable structure by entering nickel in the lattice of the alumina are similar to each other and are easily distinguished. Although it is difficult to do so, the supported catalyst according to the present invention, compared to the supported catalyst according to Comparative Example 1, the surface nickel oxide species and nickel-aluminate that are weakly bonded to the alumina that causes low activity is eliminated and relatively strong binding It can be seen that the surface nickel oxide species are formed.

3 is a supported catalyst prepared according to Preparation Examples 3 and 4 (20Ni / Al ₂ O ₃ -ZrO ₂ -1 and 20Ni / Al ₂ O ₃ -ZrO ₂ -2) and a supported catalyst prepared according to Comparative Example 1 ( X-ray diffraction analysis obtained after reduction of 20Ni / Al ₂ O ₃ ) at 800 ^° C. for 3 hours using a mixed gas of nitrogen (30 ml / min) and hydrogen (10 ml / min). Drawing.

As shown in FIG. 3, it can be seen that the supported catalyst according to the present invention has a well developed nickel peak in an active phase, unlike the supported catalyst prepared according to Comparative Example 1. In the supported catalyst according to the present invention, it can be confirmed that nickel having a small particle size is formed.

Examples 1 and 2 and Comparative Example 2

Steam reforming reaction of liquefied natural gas according to the present invention

Hydrogen production reaction by steam reforming reaction of liquefied natural gas consisting of methane and ethane mixed gas was carried out using three supported catalysts according to Preparation Examples 3, 4 and Comparative Example 1. The composition of the liquefied natural gas consisting of a mixture of methane and ethane used in the reactants is shown in Table 1, the schematic of the reactor is shown in FIG.

Furtherance Molecular formula Volume content (%) methane CH ₄ 92 ethane C ₂ H ₆ 8 Sum 100

For the steam reforming reaction, a straight quartz reactor was installed in an electric furnace to maintain a constant reaction temperature through a temperature controller, and the reaction proceeded continuously while passing the catalyst layer in the reactor. The amount of nitrogen and hydrogen used in the mixed gas and pretreatment (catalyst reduction) of methane and ethane used in the reaction was controlled using a mass flow controller, and the amount of water vapor was controlled by adjusting the injection rate of the syringe pump containing water. It was.

Before the reaction, the catalyst was reduced for 3 hours while flowing nitrogen (30 ml / min) and hydrogen (10 ml / min) simultaneously at 800 ° C. The spatial velocity of the reactants was set to 3,000 ml / h · g-catalyst and the molar ratio of water vapor / carbon as the reactants was maintained at 2. Water vapor is injected in the form of water at the inlet of the reactor, and the reaction device is designed so that the water is vaporized directly with water vapor at 150 ° C. and completely mixed with another reactant mixture of methane and ethane. Steam reforming was performed at 600 ° C.

The type and amount of the product were analyzed by gas chromatography (GC), and molecular sieves 5M (Molecularsieve 5A) and Porapak N were used. In addition to the target hydrogen, the product contains carbon monoxide, carbon dioxide and unreacted methane, ethane and water vapor. Conversion rate of liquefied natural gas, hydrogen yield, hydrogen composition in dry gas was calculated by the following equations (1), (2) and (3), respectively.

Evaluation example 2

Catalytic reactivity

The results of the hydrogen production reaction by steam reforming of the liquefied natural gas according to Examples 1, 2 and Comparative Example 2 are shown in Table 2 below.

Classification Zirconia content (% by weight) Conversion rate of liquefied natural gas (%) Hydrogen yield (%) Composition of hydrogen in dry gas (%) Example 1 10.9 80.1 238.2 67.1 Example 2 17.5 86.3 264.3 69.0 Comparative Example 2 0 72.0 218.1 66.2

As can be seen from the results of Table 2, in the case of the supported catalyst according to the present invention, the zirconia content on the supported catalyst was changed according to the alumina-zirconia carrier production method, and the content of zirconia in the supported catalyst was 10.9 wt% (Example As it increased from 1) to 17.5% by weight (Example 2), the liquefied natural gas conversion rate increased greatly from 80.1% to 86.3%, and the hydrogen yield also increased greatly from 238.2% to 264.3%. In addition, the composition of hydrogen in the dry gas also increased from 67.1% to 69.0%.

As indicated above, the catalyst according to Example 2 showed better catalytic activity in the steam reforming reaction of liquefied natural gas than the catalyst according to Example 1, because the content of zirconia in the alumina-zirconia composite oxide carrier was increased. It seems to be. The catalyst according to the present invention shows better liquefied natural gas conversion, hydrogen yield and hydrogen composition in dry gas than the 20Ni / Al ₂ O ₃ catalyst according to the prior art, and therefore, the supported catalyst according to the present invention It can be seen that the catalytic activity is more excellent in the hydrogen production by the steam reforming reaction.

Looking at the change in the liquefied natural gas conversion rate of the catalyst according to Examples 1 and 2 according to the reaction time at 600 ℃ as shown in FIG. As can be seen from Figure 5, it can be seen that the conversion rate of the liquefied natural gas is reduced in the order of Example 2> Example 1> Comparative Example 1. In other words, the supported catalyst according to the present invention showed better catalytic activity than the supported catalyst according to the prior art. The high hydrogen composition in the dry gas means that the production of products that reduce the purity of hydrogen supplied to fuel cells such as carbon monoxide and carbon dioxide is relatively reduced, and the supported catalyst according to the present invention is reforming of liquefied natural gas. It can be seen that it acts as a very efficient catalyst for the reaction.

Catalyst stability

Prepared according to Preparation Example 4 20Ni / Al ₂ O ₃ -ZrO using the catalyst according to the method of _2-2 of Example 1 to perform the hydrogen-producing reaction by the steam reforming of the liquefied natural gas in accordance with the reaction time at 600 ℃ The results of examining the change in catalytic activity are shown in FIG. 6.

As shown in FIG. 6, in the case of the 20Ni / Al ₂ O ₃ -ZrO ₂ -2 catalyst showing the best catalytic activity in the present invention, the catalyst deactivation hardly occurs even after the reaction time is about 1,100 minutes and the stable catalyst activity Showed. From this, it can be seen that the supported catalyst according to the present invention continuously shows excellent catalytic activity with little catalyst deactivation unlike the supported catalyst according to the prior art.

According to the present invention, hydrogen gas can be produced by steam reforming of liquefied natural gas consisting of a relatively inexpensive mixed gas of methane and ethane, rather than steam reforming of pure methane. In addition, it shows high reaction activity and can be manufactured at a lower production cost than the conventional high active noble metal catalyst, and its hydrogen content is reduced by the steam reforming reaction of liquefied natural gas with excellent reproducibility. A supported catalyst for producing gas, a method for producing the same, and a method for producing hydrogen gas using the supported catalyst can be provided.

Claims (24)

An alumina-zirconia composite oxide carrier comprising alumina and zirconia grafted on the surface of the alumina and having a specific surface area of 50 m ² / g to 300 m ² / g; And Water vapor of liquefied natural gas containing catalyst metal supported on the composite oxide carrier A supported catalyst for producing hydrogen gas by a group reforming reaction. The supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas according to claim 1, wherein the alumina-zirconia composite oxide carrier comprises 1 to 50 parts by weight of zirconia with respect to 100 parts by weight of the alumina. The method of claim 1, wherein the catalyst metal is Pt, Au, Pd, Rh, La, Ce, Yb, Ni, Cu, Ag, Ru, Ir, Os, Au, Co, V, Fe, Sn, Ca, Mg or A supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas, which is a mixture thereof. The supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas according to claim 1, wherein the catalyst metal is supported in an amount of 1 to 50 parts by weight based on 100 parts by weight of the composite oxide carrier. delete The supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas according to claim 1, wherein the average particle diameter of the catalyst metal is 2 to 50 nm. a) dispersing the alumina powder in an organic solvent and then adding a basic catalyst to activate the surface of the alumina powder; b) adding and reacting a zirconium precursor to the alumina powder; c) preparing a slurry by washing the reaction product of step b) with an organic solvent; d) performing hydration and condensation by adding distilled water to the slurry; e) filtering the reaction product of step d), drying and heat treating the filtrate to prepare an alumina-zirconia composite oxide carrier; f) mixing the alumina-zirconia composite oxide carrier and the catalyst metal precursor in a dispersion medium and uniformly mixing them; And g) a method of preparing a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas comprising drying and heat-treating the mixture. The method of claim 7, wherein the organic solvent of step a) and c) is toluene, 2-butanol, benzene, ethylbenzene, trimethylbenzene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, ethyl acetate, butyl acetate, Support for producing hydrogen gas by steam reforming of liquefied natural gas, characterized in that at least one organic solvent selected from the group consisting of n-hexane, isopropyl alcohol, trichloroethylene, 1,1,1-trichloroethane and pentane Method for preparing a catalyst. The method of claim 7, wherein the basic catalyst is ethylamine, diethylamine, triethylamine, trimethylamine, N-methylpyrrolidine, pyridine, 4- (N, N-dimethylamino) pyridine, 4- (N, N-diethylamino) pyridine, N, N-dimethylformamide and 1-methyl-2-pyrrolidone Hydrogen gas by steam reforming of liquefied natural gas, characterized in that at least one basic catalyst selected from the group consisting of Process for preparing supported catalyst for production. 8. The steam reforming of liquefied natural gas according to claim 7, wherein the amount of the alumina powder and the basic catalyst added in step a) is 1 to 5 parts by weight and 0.1 to 3 parts by weight based on 100 parts by weight of the organic solvent. A method for producing a supported catalyst for producing hydrogen gas by reaction. The method of claim 7, wherein the step a) is performed at a temperature of 10 ° C. to 80 ° C. for 0.5 hour to 3 hours. According to claim 7, wherein the step b) is carried out by the addition of 1 to 50 parts by weight of zirconium precursor based on 100 parts by weight of the alumina powder of the supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas Manufacturing method. The method of claim 7, wherein the zirconium precursor is zirconium butoxide, zirconium propoxide, zirconium tert-butoxide, zirconium isopropoxide and zirconium isopropoxide A method for producing a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas, characterized in that it is zirconium alkoxide selected from the group consisting of the mixture. The method of claim 7, wherein the step b) is performed for 3 to 10 hours at a temperature of 10 ℃ to 80 ℃ while adding and stirring the zirconium precursor at a rate of 0.01 g / min to 0.1 g / min A method for producing a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas. The method according to claim 7, wherein the step c) is carried out one to five times, characterized in that the production method of the supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas. The method according to claim 7, wherein the hydration and condensation reaction of step d) is performed by adding 1 to 10 parts by weight of the slurry to 100 parts by weight of the distilled water and reacting at a temperature of 10 ° C to 80 ° C for 3 to 10 hours. A process for producing a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas. The method of claim 7, wherein the drying of the steps e) and g) is performed for 1 to 10 hours at a temperature of 70 ℃ to 200 ℃, heat treatment is performed for 3 to 10 hours at a temperature of 400 ℃ to 800 ℃ A process for producing a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas. The hydrogen by steam reforming of liquefied natural gas according to claim 7, wherein the step f) is performed by adding 1 to 50 parts by weight of the catalyst metal precursor with respect to 100 parts by weight of the alumina-zirconia composite oxide carrier. Method for preparing a supported catalyst for producing gas. According to claim 7, wherein the dispersion medium of step f) is water; One or more alcoholic solvents selected from the group consisting of methanol, ethanol, isopropyl alcohol and butyl alcohol; Or a mixture thereof; and a supported catalyst for producing hydrogen gas by steam reforming of liquefied natural gas. A mixture of nitrogen and hydrogen is flowed while maintaining the surface temperature of the supported catalyst for producing hydrogen gas by the steam reforming reaction of liquefied natural gas according to any one of claims 1 to 4 or 6. Preprocessing by zooming; And 2,000 ml / h · g-catalyst to 30,000 ml / h · of liquefied natural gas and water vapor containing methane gas and ethane gas while maintaining a reaction temperature of 500 ° C. to 900 ° C. on the surface of the pre-treated supported catalyst. Hydrogen gas production method comprising the step of flowing at the space velocity of the g-catalyst. 21. The method of claim 20, wherein the hydrogen / nitrogen mixed volume ratio of the nitrogen and hydrogen mixed gas is 0.01 to 0.3. The method of claim 20, wherein the pretreatment time is 2 to 8 hours. 21. The method of claim 20, wherein the mixed volume ratio of the liquefied natural gas and water vapor is 1 to 10. The method of claim 20, wherein the liquefied natural gas of methane gas / ethane gas mixing volume ratio is 99.9 to 9, characterized in that the hydrogen gas production method.

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