CN111632589A - Preparation method of high-stability automobile exhaust purification catalyst - Google Patents
Preparation method of high-stability automobile exhaust purification catalyst Download PDFInfo
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- 239000003054 catalyst Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000000746 purification Methods 0.000 title claims abstract description 12
- 229910052878 cordierite Inorganic materials 0.000 claims abstract description 68
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 claims abstract description 68
- 230000000694 effects Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 20
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000002131 composite material Substances 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 6
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- 239000008367 deionised water Substances 0.000 claims description 6
- 229910021641 deionized water Inorganic materials 0.000 claims description 6
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 6
- 229910000510 noble metal Inorganic materials 0.000 claims description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 6
- 239000001301 oxygen Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000003860 storage Methods 0.000 claims description 6
- OERNJTNJEZOPIA-UHFFFAOYSA-N zirconium nitrate Chemical compound [Zr+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O OERNJTNJEZOPIA-UHFFFAOYSA-N 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 4
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 claims description 3
- NGDQQLAVJWUYSF-UHFFFAOYSA-N 4-methyl-2-phenyl-1,3-thiazole-5-sulfonyl chloride Chemical compound S1C(S(Cl)(=O)=O)=C(C)N=C1C1=CC=CC=C1 NGDQQLAVJWUYSF-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 229910052684 Cerium Inorganic materials 0.000 claims description 3
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 3
- 229920001131 Pulp (paper) Polymers 0.000 claims description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 3
- 239000004480 active ingredient Substances 0.000 claims description 3
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 239000012752 auxiliary agent Substances 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 238000000748 compression moulding Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 3
- 238000003837 high-temperature calcination Methods 0.000 claims description 3
- 229910052746 lanthanum Inorganic materials 0.000 claims description 3
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 claims description 3
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- PUDIUYLPXJFUGB-UHFFFAOYSA-N praseodymium atom Chemical compound [Pr] PUDIUYLPXJFUGB-UHFFFAOYSA-N 0.000 claims description 3
- 150000003839 salts Chemical class 0.000 claims description 3
- 238000001179 sorption measurement Methods 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- VWQVUPCCIRVNHF-UHFFFAOYSA-N yttrium atom Chemical compound [Y] VWQVUPCCIRVNHF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052726 zirconium Inorganic materials 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000007493 shaping process Methods 0.000 abstract description 3
- 238000005242 forging Methods 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 239000011949 solid catalyst Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/024—Multiple impregnation or coating
- B01J37/0242—Coating followed by impregnation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/10—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of rare earths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/56—Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional monoliths
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention discloses a preparation method of an automobile exhaust purification catalyst with high stability, which comprises a first cordierite carrier, a gamma-Al 2O3 second carrier and active components, wherein the upper end of the first cordierite carrier is provided with honeycomb holes which are distributed in a rectangular manner and penetrate through the upper and lower parts, the front, rear, left and right end surfaces of the first cordierite carrier are respectively provided with strip-shaped grooves which are distributed at equal intervals, the gamma-Al 2O3 second carrier is coated on the outer surface of the first cordierite carrier, the wall of each honeycomb hole and the wall of each strip-shaped groove, and the active components are distributed on the outer surface of the gamma-Al 2O3 second carrier. According to the preparation method of the high-stability automobile exhaust purification catalyst, the adhesion rate of the active component is improved through two adhesion procedures, and the prepared catalyst is high in stability, high in activity and wide in airspeed application range through high-temperature shaping; the catalyst obtained by the invention is formed by multiple high-temperature forging, has good heat resistance, and can resist short-term impact at the high temperature of 900 ℃.
Description
Technical Field
The invention belongs to the field of catalyst preparation, and particularly relates to a preparation method of an automobile exhaust purification catalyst with high stability.
Background
A substance that can change the chemical reaction rate of a reactant (either by increasing or decreasing) in a chemical reaction without changing the chemical equilibrium and whose mass and chemical properties are not changed before or after the chemical reaction is called a catalyst (solid catalyst is also called a catalyst). According to statistics, about more than 90% of industrial processes use catalysts, such as chemical industry, petrochemical industry, biochemical industry, environmental protection and the like. In contemporary society, automobiles have become one of the main transportation tools of people, with the mass use of automobiles. A large amount of automobile exhaust is discharged into the air, causes environmental pollution, so the automobile exhaust needs to be purified, and a catalyst is an essential part in the purification process.
In the use of the existing catalyst, because the heat of the automobile exhaust is high, the heat resistance of the carrier of the catalyst is low, the catalyst is fast to consume, the service life is low, and in the manufacturing process of the existing catalyst, the carrier structure is simple, in the manufacturing process, the adhesion area of the active component is low, so that in the use process, the stability of the catalyst is poor, and the airspeed adaptive range is small, so that a novel preparation method of the automobile exhaust purification catalyst with high stability is provided.
Disclosure of Invention
The invention aims to provide a preparation method of an automobile exhaust purification catalyst with high stability, which is realized by the following technical scheme for solving the technical problems:
a preparation method of an automobile exhaust purification catalyst with high stability comprises a first cordierite carrier, a second gamma-Al 2O3 carrier and active components, and is characterized in that: the upper end of the first cordierite carrier is provided with honeycomb holes which are distributed in a rectangular mode and penetrate through the first carrier up and down, the front end face, the rear end face, the left end face, the right end face and the front end face of the first cordierite carrier are provided with strip-shaped grooves which are distributed equidistantly, the second gamma-Al 2O3 carrier is coated on the outer surface of the first cordierite carrier, the hole walls of the honeycomb holes and the groove walls of the strip-shaped grooves, and the active components.
Preferably, the method comprises the following steps:
(1) preparation of cordierite first carrier: mixing cordierite particles, ceramic particles and water according to the weight ratio of 2: mixing according to the ratio of 1:1, adding paper pulp fibers, PVA solution and a small amount of water into obtained cordierite slurry, fully mixing through pugging, then sealing for 12-15 hours, carrying out compression molding, then carrying out high-temperature firing to obtain cordierite, and carrying out honeycomb hole and strip groove treatment after cooling the cordierite to obtain a required cordierite first carrier;
(2) preparation of a second carrier of gamma-Al 2O 3: dissolving cerium nitrate, zirconium nitrate and yttrium nitrate in water according to the ratio of 3:1:1, adding ammonia water to adjust the pH value to be alkaline to obtain an oxygen storage solution, ball-milling lanthanum oxide and cerium oxide for 20-30 hours to obtain powder, adding water to mix to obtain an active aluminum solution, adding 30% of the obtained active aluminum solution and 50% of the obtained oxygen storage solution into water containing an auxiliary agent 1, 4-butyrolactone, and fully mixing to obtain a gamma-Al 2O3 second carrier solution;
(3) preparing an active component; mixing soluble salt containing one or more elements of lanthanum, zirconium, cerium, yttrium or praseodymium with deionized water at the temperature of 30-60 ℃ to obtain noble metal solution, and mixing pseudo-boehmite and deionized water according to the weight ratio of 1: 10 at the temperature of 30-60 ℃ to obtain slurry, fully mixing the noble metal solution and the obtained slurry according to the ratio of 1:1 for 30 minutes, and sealing for 2-3 hours to fully react to obtain the high-activity composite alumina solution.
(4) Adsorption of active ingredients: and (3) putting the cordierite first carrier obtained in the step (1) into the gamma-Al 2O3 second carrier solution in the step (2) for soaking for 30-50 minutes, putting the soaked cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 20-30 minutes, taking out the cordierite first carrier for drying treatment, and putting the dried cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 10-15 minutes.
(5) And (3) forming of the catalyst: and (4) drying the cordierite first carrier soaked in the step (4) for the second time, calcining at high temperature after combustion, taking out after calcination, and cooling to obtain the required catalyst.
Preferably, the cordierite first carrier obtained in the step (1) has a water absorption of 25% to 30%, and the honeycomb pores on the cordierite first carrier have a pore density of 200-300 mesh/square inch.
Preferably, the high-temperature firing temperature in the step (1) is 800-900 ℃, and the high-temperature firing time is 10-12 hours.
Preferably, the first cordierite carrier soaked in the step (4) is dried at the temperature of 60-80 ℃ for 40-60 minutes.
Preferably, the cordierite first carrier is subjected to secondary drying in the step (5) at a temperature of 35 to 55 ℃ for a drying time of 20 to 40 minutes.
Preferably, the high-temperature calcination temperature in the step (5) is 1100-1300 ℃, and the calcination time is 6-8 hours.
The invention has the following beneficial effects:
the honeycomb holes with the density of 200-plus 300 meshes/square inch are formed in the first cordierite carrier, rectangular grooves are formed in the front, the rear, the left and the right end faces of the first cordierite carrier, the attachment area of an active component is greatly increased in the catalysis and manufacturing process, the attachment rate of the active component is increased through two attachment procedures in the attachment process of the active component to the gamma-Al 2O3 second carrier, and the manufactured catalyst is high in stability, high in activity and wide in airspeed application range through high-temperature shaping; the catalyst obtained by the invention is formed by multiple high-temperature forging, has good heat resistance, can resist the impact of high temperature of 900 ℃ in a short period, has low initial reaction temperature and wide application.
Drawings
FIG. 1 is a schematic structural view of a first cordierite substrate according to the present invention.
FIG. 2 is a schematic view showing the distribution of a cordierite first carrier, a γ -Al2O3 second carrier, and an active component according to the present invention.
FIG. 3 is a flow chart of the preparation method of the present invention.
1. A cordierite first carrier; 2. honeycomb holes; 3. a strip-shaped groove; 4. a second support of gamma-Al 2O 3; 5. An active component.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a preparation method of an automobile exhaust purification catalyst with high stability, which comprises a cordierite first carrier 1, a gamma-Al 2O3 second carrier 4 and an active component 5, and is characterized in that: the upper end of the first cordierite carrier 1 is provided with honeycomb holes 2 which are distributed in a rectangular shape and penetrate through the upper and lower parts, the front, rear, left and right end surfaces of the first cordierite carrier 1 are provided with strip-shaped grooves 3 which are distributed at equal intervals, the second gamma-Al 2O3 carrier 2 is coated on the outer surface of the first cordierite carrier 1, the hole walls of the honeycomb holes 2 and the groove walls of the strip-shaped grooves 3, and the active components 5 are distributed on the outer surface of the second gamma-Al 2O3 carrier 4.
The preparation method of the catalyst comprises the following steps:
(1) preparation of cordierite first carrier: mixing cordierite particles, ceramic particles and water according to the weight ratio of 2: 1:1, adding paper pulp fiber, PVA solution and a small amount of water into the obtained cordierite slurry, fully mixing through pugging, sealing for 12-15 hours, then carrying out compression molding, firing at the high temperature of 800-900 ℃ for 10-12 hours to obtain cordierite, cooling the cordierite, and then carrying out honeycomb holes and strip groove treatment to obtain the required cordierite first carrier, wherein the water absorption rate of the obtained cordierite first carrier is 25-30%, and the hole density of the honeycomb holes on the cordierite first carrier is 200-300 meshes/square inch;
(2) preparation of a second carrier of gamma-Al 2O 3: dissolving cerium nitrate, zirconium nitrate and yttrium nitrate in water according to the ratio of 3:1:1, adding ammonia water to adjust the pH value to be alkaline to obtain an oxygen storage solution, ball-milling lanthanum oxide and cerium oxide for 20-30 hours to obtain powder, adding water to mix to obtain an active aluminum solution, adding 30% of the obtained active aluminum solution and 50% of the obtained oxygen storage solution into water containing an auxiliary agent 1, 4-butyrolactone, and fully mixing to obtain a gamma-Al 2O3 second carrier solution;
(3) preparing an active component; mixing soluble salt containing one or more elements of lanthanum, zirconium, cerium, yttrium or praseodymium with deionized water at the temperature of 30-60 ℃ to obtain noble metal solution, and mixing pseudo-boehmite and deionized water according to the weight ratio of 1: 10 at the temperature of 30-60 ℃ to obtain slurry, fully mixing the noble metal solution and the obtained slurry according to the ratio of 1:1 for 30 minutes, and sealing for 2-3 hours to fully react to obtain a high-activity composite alumina solution;
(4) adsorption of active ingredients: putting the cordierite first carrier obtained in the step (1) into the gamma-Al 2O3 second carrier solution in the step (2) for soaking for 30-50 minutes, putting the soaked cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 20-30 minutes, taking out the cordierite first carrier, drying the cordierite first carrier at the temperature of 60-80 ℃ for 40-60 minutes, and putting the dried cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 10-15 minutes;
(5) and (3) forming of the catalyst: and (4) carrying out secondary drying on the cordierite first carrier soaked in the step (4) at the temperature of 35-55 ℃ for 20-40 minutes, carrying out high-temperature calcination at the temperature of 1100-1300 ℃ for 6-8 hours after combustion, taking out the calcined carrier and cooling to obtain the required catalyst.
In the invention, the selected cordierite first carrier has a unique structure and is fired at high temperature, the water absorption rate of the cordierite first carrier is 25-30%, the cell density of honeycomb pores on the cordierite first carrier is 200-300 meshes/square inch, the attachment area of an active component is greatly improved in the catalytic and manufacturing process, in the attachment process of the active component to a gamma-Al 2O3 second carrier, the attachment rate of the active component is improved through two attachment procedures, and the manufactured catalyst has high stability, high activity and wide airspeed application range through high-temperature shaping; the catalyst obtained by the invention is forged at the high temperature of 1100-1300 ℃, has good heat resistance, can resist the impact of the high temperature of 900 ℃ for a short period, has low initial reaction temperature and wide application.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (7)
1. A preparation method of an automobile exhaust purification catalyst with high stability comprises a first cordierite carrier, a second gamma-Al 2O3 carrier and active components, and is characterized in that: the upper end of the first cordierite carrier is provided with honeycomb holes which are distributed in a rectangular mode and penetrate through the first carrier up and down, the front end face, the rear end face, the left end face, the right end face and the front end face of the first cordierite carrier are provided with strip-shaped grooves which are distributed equidistantly, the second gamma-Al 2O3 carrier is coated on the outer surface of the first cordierite carrier, the hole walls of the honeycomb holes and the groove walls of the strip-shaped grooves, and the active components.
2. The preparation method of the automobile exhaust purification catalyst with high stability according to claim 1, characterized by comprising the following steps:
(1) preparation of cordierite first carrier: mixing cordierite particles, ceramic particles and water according to the weight ratio of 2: mixing according to the ratio of 1:1, adding paper pulp fibers, PVA solution and a small amount of water into obtained cordierite slurry, fully mixing through pugging, then sealing for 12-15 hours, carrying out compression molding, then carrying out high-temperature firing to obtain cordierite, and carrying out honeycomb hole and strip groove treatment after cooling the cordierite to obtain a required cordierite first carrier;
(2) preparation of a second carrier of gamma-Al 2O 3: dissolving cerium nitrate, zirconium nitrate and yttrium nitrate in water according to the ratio of 3:1:1, adding ammonia water to adjust the pH value to be alkaline to obtain an oxygen storage solution, ball-milling lanthanum oxide and cerium oxide for 20-30 hours to obtain powder, adding water to mix to obtain an active aluminum solution, adding 30% of the obtained active aluminum solution and 50% of the obtained oxygen storage solution into water containing an auxiliary agent 1, 4-butyrolactone, and fully mixing to obtain a gamma-Al 2O3 second carrier solution;
(3) preparing an active component; mixing soluble salt containing one or more elements of lanthanum, zirconium, cerium, yttrium or praseodymium with deionized water at the temperature of 30-60 ℃ to obtain noble metal solution, and mixing pseudo-boehmite and deionized water according to the weight ratio of 1: 10 at the temperature of 30-60 ℃ to obtain slurry, fully mixing the noble metal solution and the obtained slurry according to the ratio of 1:1 for 30 minutes, and sealing for 2-3 hours to fully react to obtain the high-activity composite alumina solution.
(4) Adsorption of active ingredients: and (3) putting the cordierite first carrier obtained in the step (1) into the gamma-Al 2O3 second carrier solution in the step (2) for soaking for 30-50 minutes, putting the soaked cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 20-30 minutes, taking out the cordierite first carrier for drying treatment, and putting the dried cordierite first carrier into the high-activity composite alumina solution in the step (3) for soaking for 10-15 minutes.
(5) And (3) forming of the catalyst: and (4) drying the cordierite first carrier soaked in the step (4) for the second time, calcining at high temperature after combustion, taking out after calcination, and cooling to obtain the required catalyst.
3. The preparation method of the catalyst for purifying automobile exhaust with high stability according to claim 2, wherein the preparation method comprises the following steps: the water absorption rate of the cordierite first carrier obtained in the step (1) is 25-30%, and the cell density of the honeycomb cells on the cordierite first carrier is 200-300 meshes/square inch.
4. The preparation method of the catalyst for purifying automobile exhaust with high stability according to claim 2, wherein the preparation method comprises the following steps: the high-temperature firing temperature in the step (1) is 800-900 ℃, and the high-temperature firing time is 10-12 hours.
5. The preparation method of the catalyst for purifying automobile exhaust with high stability according to claim 2, wherein the preparation method comprises the following steps: the first cordierite carrier soaked in the step (4) is dried at the temperature of 60-80 ℃ for 40-60 minutes.
6. The preparation method of the catalyst for purifying automobile exhaust with high stability according to claim 2, wherein the preparation method comprises the following steps: in the step (5), the temperature for secondary drying of the cordierite first carrier is 35-55 ℃, and the drying time is 20-40 minutes.
7. The preparation method of the catalyst for purifying automobile exhaust with high stability according to claim 2, wherein the preparation method comprises the following steps: the high-temperature calcination temperature in the step (5) is 1100-1300 ℃, and the calcination time is 6-8 hours.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01236942A (en) * | 1988-03-14 | 1989-09-21 | Mazda Motor Corp | Catalyst for purifying exhaust gas |
| US5916839A (en) * | 1995-10-13 | 1999-06-29 | Samsung Electro-Mechanics Co., Ltd. | Catalyst for purifying automobile exhausts |
| CN1436592A (en) * | 2002-02-07 | 2003-08-20 | 中国石油化工股份有限公司 | Prepn process of catalyst for purfying automobile tail gas |
| CN1436598A (en) * | 2002-02-07 | 2003-08-20 | 中国石油化工股份有限公司 | Coating method of automobile tail gas purifying catalyst |
| WO2015143225A1 (en) * | 2014-03-21 | 2015-09-24 | SDCmaterials, Inc. | Compositions for passive nox adsorption (pna) systems |
| CN109012666A (en) * | 2018-09-15 | 2018-12-18 | 四川鑫元瑞科技有限公司 | A kind of preparation method of cleaning catalyst for tail gases of automobiles |
| CN110252294A (en) * | 2019-06-11 | 2019-09-20 | 合肥神舟催化净化器股份有限公司 | A kind of preparation method of cleaning catalyst for tail gases of automobiles |
| CN110922205A (en) * | 2019-12-05 | 2020-03-27 | 陕西科技大学 | Porous cordierite and preparation method thereof |
-
2020
- 2020-06-09 CN CN202010520324.3A patent/CN111632589A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01236942A (en) * | 1988-03-14 | 1989-09-21 | Mazda Motor Corp | Catalyst for purifying exhaust gas |
| US5916839A (en) * | 1995-10-13 | 1999-06-29 | Samsung Electro-Mechanics Co., Ltd. | Catalyst for purifying automobile exhausts |
| CN1436592A (en) * | 2002-02-07 | 2003-08-20 | 中国石油化工股份有限公司 | Prepn process of catalyst for purfying automobile tail gas |
| CN1436598A (en) * | 2002-02-07 | 2003-08-20 | 中国石油化工股份有限公司 | Coating method of automobile tail gas purifying catalyst |
| WO2015143225A1 (en) * | 2014-03-21 | 2015-09-24 | SDCmaterials, Inc. | Compositions for passive nox adsorption (pna) systems |
| CN109012666A (en) * | 2018-09-15 | 2018-12-18 | 四川鑫元瑞科技有限公司 | A kind of preparation method of cleaning catalyst for tail gases of automobiles |
| CN110252294A (en) * | 2019-06-11 | 2019-09-20 | 合肥神舟催化净化器股份有限公司 | A kind of preparation method of cleaning catalyst for tail gases of automobiles |
| CN110922205A (en) * | 2019-12-05 | 2020-03-27 | 陕西科技大学 | Porous cordierite and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 罗民华编著，: "《多孔陶瓷实用技术》", 31 March 2006, 中国建材工业出版社 * |
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