CN1284403A - Improved Y-type rare earth zeolite and its preparation - Google Patents

Abstract

The Y-type rare earth zeolite with optimized secondary pore structure has an relative XRD crystallinity of 65-85 % and a secondary pore volume of 20-80 % by total pore volume. During its preparation, Y-type rare earth zeolite containing Na2O 2.5-8 wt% is first impregnated in silicious solution and then dried to obtain a silicon content of 1-15 wt% (by SiO2). After that, the impregnated Y-type rare earth zeolite is hydrothermally calcined in steam atmosphere at 500-850 deg.C for 0.5-30 hr. Compared with available zeolite, the Y-type zeolite has more secondary pore and higher heavy oil converting capacity, and is suitable for processingray material blended with residue.

Description

A kind of improved rare earth Y type zeolite and preparation thereof

The present invention relates to a kind of improved rare earth Y type zeolite and preparation method thereof.More particularly, be rare earth Y type zeolite of optimizing about a kind of second hole that can be used for hydrocarbon conversion reactions and preparation method thereof.

The catalyst that contains y-type zeolite is widely used in the petroleum hydrocarbon conversion process for example in the catalytic cracking and hydrocracking process of hydro carbons, in these processes, must carry out modification from the NaY type zeolite that initially synthesizes as the y-type zeolite of main active constituent and make it be suitable for activated centre as hydrocarbon conversion reactions.

In the method for modifying of y-type zeolite, exchange is indispensable with the step of roasting.Be about to initial na-pretreated zeolite through behind the ammonium ion or rare earth ion exchanged of one or many, be higher than under 500 ℃ the temperature, existing or not existing under the condition of steam, the zeolite that exchanged is carried out roasting, repeat this exchange one calcination steps of one or many then.Such processing procedure can remove the part aluminium in the zeolite lattice and the unit cell dimension of zeolite is narrowed down between 24.2～24.5 .Such example all has report in a lot of patents, as USP3293192, and 3449070,3493519,3513108,3506400 and 3929672 etc.

General by such processing, can improve the hydrothermal stability of zeolite.Hydrothermal stability typically refers to when zeolite during roasting, can keep the ability of its degree of crystallinity and specific surface and reactivity under high-temperature water vapor atmosphere.In existing Zeolite modifying method, if the content of sodium oxide molybdena is higher in the original zeolite, it is not thorough to take off sodium as if exchange, can influence the degree of crystallinity of product in roasting process greatly.

Disclose a kind of silicon-rich Y-shaped molecular sieve Cracking catalyst that contains rare earth oxide among the CN1005387B, Y zeolite wherein is to prepare through hydrothermal calcine by rare earth and silicon are deposited on the Y zeolite with the form of oxide again.Disclose a kind of preparation method who contains the ultrastable of amorphous silicon aluminium among the CN1029203C, this method is amorphous silicon aluminium to be deposited on carry out hydrothermal calcine on the Y zeolite then.The purpose of these two kinds of methods all is that the solid phase migration by silicon in the hydrothermal calcine process can insert the part silicon atom to take out in the formed space of aluminium, make the products molecule sieve shrink to improve optionally and simultaneously can have higher hydrothermal stability and reactivity at structure cell, but owing to the form of silicon with soild oxide exists, the effect of its solid phase migration is also not really desirable.

The second hole of molecular sieve is meant that generally the bore dia except that molecular sieve intracrystalline micropore is the hole of 20～1000 .Because the heaviness of crude oil and poor qualityization, in order to improve the cracking ability of catalyst towards heavy matter and inferior raw material, people wish as the Y zeolite in activated centre more second hole is arranged; For the purpose of increasing output of diesel oil, wish that also Y zeolite has more second hole in addition.It is generally acknowledged that molecular sieve can form second hole in the hydrothermal calcine dealumination process, if but the amplitude of roasting dealuminzation is too big, do not have corresponding silicon atom in time to replenish the room that stays behind the dealuminzation again, though can form more second hole, the degree of crystallinity of molecular sieve will reduce greatly.If the molecular sieve after the modification can form more second hole, can keep higher degree of crystallinity again, then be that the cracking hydrocarbon reaction is needed.

Purpose of the present invention is that a kind of improved rare earth Y type zeolite and preparation method thereof is provided, and makes this improved rare earth Y type zeolite both have more second hole, maintains higher degree of crystallinity again.

Its relative crystallinity of improved rare earth Y type zeolite provided by the present invention is 65～85%, and its second hole volume accounts for 20～80% of total pore volume, preferably accounts for 25～70% of total pore volume.

Its ree content of improved rare earth Y type zeolite provided by the present invention can be 1～17 weight %, preferred 3～15 weight %; Said rare earth element is La or Ce or based on the mixed rare-earth elements of La and/or Ce.

Said relative crystallinity is that the product zeolite is compared resulting degree of crystallinity with the NaY raw material (defining its degree of crystallinity is 100%) among the embodiment 1 among the present invention, the assay method of this relative crystallinity is referring to " petrochemical industry analytical method (RIPP test method) " (volume such as Yang Cuiding, Science Press, nineteen ninety publishes) in RIPP 146-90 standard method.

The assay method of said second hole volume and total pore volume is as follows among the present invention: according to RIPP 151-90 standard method (" petrochemical industry analytical method (RIPP test method) ", Yang Cui waits volume surely, Science Press, nineteen ninety publishes) determine the total pore volume of molecular sieve according to adsorption isotherm, determine the micro pore volume of molecular sieve from adsorption isotherm according to the T graphing method then, total pore volume is deducted micro pore volume obtain the second hole volume.

The preparation method of said improved y-type zeolite provided by the invention comprises, with Na ₂O content is 2.5～8 weight %, and the rare earth Y type zeolite of preferred 3～6 weight % is dry then with a kind of siliceous solution impregnation, makes said rare earth Y type zeolite contain the silicon of said dipping of 1～15 weight % (with SiO ₂Meter), then gained is contained flood silicon rare earth Y type zeolite in steam atmosphere in 500～850 ℃ of hydrothermal calcines 0.5～30 hour, preferably 550～800 ℃ of following hydrothermal calcines 1～24 hour, more preferably 600～750 ℃ of following hydrothermal calcines 2～20 hours; Wherein said siliceous solution is selected from Ludox, waterglass, fluosilicate or organic silicon solution, preferred Ludox, waterglass or fluosilicate, more preferably Ludox or waterglass.Wherein said organosilicon is dimethicone or polymethylphenyl siloxane fluid such as polymethylphenyl siloxane fluid 255, polymethylphenyl siloxane fluid 250 and polymethylphenyl siloxane fluid 274 etc.

Said Na in the method provided by the invention ₂O content is that the rare earth Y type zeolite of 2.5～8 weight % can be that lattice constant is REY type zeolite, REHY type zeolite or the extremely steady y-type zeolite of rare earth of 2.440～2.475 nanometers.

The concentration of said siliceous solution is inessential in the method provided by the invention, thereby can select in the scope of broad, and can flood with said silicon evenly is standard.

One of feature of the inventive method is to adopt higher hydrothermal calcine temperature and long hydrothermal calcine time to produce more second hole; Two of its feature is that molecular sieve has higher sodium content in the hydrothermal calcine process, can slow down the dealuminzation speed of molecular sieve under hydrothermal condition like this, and think in the prior art that the sodium in the zeolite is low more good more; Three of its feature is that molecular sieve is impregnated with siliceous solution before hydrothermal calcine, and silicon atom wherein can migrate to the formed room of molecular sieve dealuminzation and carry out solid phase benefit silicon in the hydrothermal calcine process.Mechanism wherein is as follows: under the experiment condition that this method provides, more sodium oxide molybdena in the zeolite of high oxidation sodium content can slow down the speed of zeolite dealuminzation, simultaneously, along with the silicon at zeolite surface can partly enter the room that dealuminzation produces, accelerate to mend the speed of silicon, make dealuminzation suitable with benefit silicon speed, skeleton structure of zeolite is complete, has still kept higher degree of crystallinity when dealuminzation produces second hole; The present invention is owing to adopt liquid siliceous solution to flood in addition, and the silicon of dipping distributes more even on molecular sieve, also carries out the solid phase migration than being easier to, and helps improving the crystallization reservation degree of molecular sieve.The zeolite of the method for prior art preparation is if produce considerable second hole, and then its degree of crystallinity is not high, and main cause is that the speed of dealuminzation in the zeolitic frameworks is much larger than the speed of mending silicon (or silicon migration), zeolite structured easy avalanche.Generally speaking, the speed of dealuminzation is very fast, mends silicon (or silicon migration) inadequately and cause, thereby has influenced the formation of the zeolite of high-crystallinity and high framework si-al ratio.Preparation method provided by the invention has been then because the speed that has reduced dealuminzation has improved and mended the speed of silicon and make dealuminzation and mend silicon and reach certain balance, thereby prolongs roasting time and still can keep higher zeolite crystallinity under with the situation that produces more second hole improving the hydrothermal calcine temperature.

The zeolite of second hole optimization provided by the invention is specially adapted to do the active constituent of catalytic cracking catalyst, with existing zeolite facies ratio, this zeolite has more second hole volume, and has high ability of residuum conversion and higher diesel yield, and residual oil raw material is mixed in suitable processing.

Following embodiment will the present invention is described further, but not thereby limiting the invention.

Embodiment 1

The prepare zeolite that second hole provided by the invention is optimized.

With 100 gram (dry basis) lattice constants is NaY type zeolite (sodium oxide content 14 heavy %, Qilu Petrochemical company Zhou village catalyst plant is produced) and 2 liters of (NH that concentration are 5 heavy % of 2.473 nanometers ₄) ₂SO ₄The aqueous solution carried out ion-exchange 0.5 hour in 60 ℃, filtered, and spent the deionised water filter cake to there not being acid group, obtained NH after the drying ₄NaY type zeolite.

NH with 90 gram (dry basis) above-mentioned preparations ₄NaY type zeolite carries out ion-exchange 0.5 hour under 90 ℃ in the lanthanum chloride solution of 2 liter of 0.2 M, filter, and spends the deionised water filter cake to there not being acid group, obtains containing the NH of lanthanum after the drying ₄NaY type zeolite records its Na ₂O content is 4.0 weight %.

80 gram (dry basis) above-mentioned preparations are contained lanthanum NH ₄(Changhong chemical plant, Beijing commercial product contains 12%SiO to NaY type zeolite at 100 gram Ludox ₂) in soaked 30 minutes, 120 ℃ of dryings 2 hours, make molecular sieve contain the SiO of 10 weight % by butt then ₂, obtain containing lanthanum NH with silicon dipping ₄The NaY zeolite.

70 gram (dry basis) above-mentioned preparations are contained lanthanum NH with silicon dipping ₄The roasting 16 hours in 650 ℃ of water vapour atmospheres of NaY zeolite, the product that obtains with 20 times deionized water washing promptly obtains the zeolite that second hole of the present invention is optimized after the drying again, is designated as A-1.Table 1 has provided the composition of A-1, lattice constant, and relative crystallinity and specific area and second hole volume account for the percentage of total pore volume.

Wherein, the content of sodium oxide molybdena during zeolite is formed, the content of aluminium oxide and the content of silica all adopt x-ray fluorescence spectrometry; Lattice constant and relative crystallinity adopt X-ray diffraction method to measure; Specific surface and pore volume adopt N ₂Absorption (BET) method is measured.The framework si-al ratio of zeolite is calculated and is got by following formula:

Si/Al=192/[1124×(a ₀-2.42383)]

The performance of the A-1 zeolite of table 1: embodiment 1 gained

The zeolite numbering	?A-1
		Lattice constant, nm	?2.454
Relative crystallinity, %	?74
		Specific area, m 2/g	?652
Total pore volume, ml/g	?0.394
		Micro pore volume, ml/g	?0.270
The second hole volume, ml/g	?0.124
		Second hole volume/total pore volume, %	?31.5
Chemical composition, weight %
		????Na 2O	?3.5
????Al 2O 3	?19.7
		????SiO 2	?63.1
????La 2O 3	?13.7

Embodiment 2

The prepare zeolite that second hole provided by the invention is optimized.

With 100 gram (dry basis) lattice constants is NaY type zeolite (sodium oxide content 14 heavy %, Qilu Petrochemical company Zhou village catalyst plant is produced) and 2 liters of (NH that concentration are 10 heavy % of 2.473 nanometers ₄) ₂SO ₄The aqueous solution carried out ion-exchange 0.5 hour in 60 ℃, filtered, and spent the deionised water filter cake to there not being acid group, obtained NH after the drying ₄NaY type zeolite.

NH with 90 gram (dry basis) above-mentioned preparations ₄NaY type zeolite is at the mixed chlorinated rare earth (La that contains 45.45 weight % by total rare earth (TRE) of 1 liter of 30.8 weight %, 10.58 the Ce of weight %, and other rare earth of 43.97 weight %) under 90 ℃, carries out ion-exchange 0.5 hour in the solution, filter, spend the deionised water filter cake to there not being acid group, obtain exchanging the NH of mixed rare earth ions after the drying ₄NaY type zeolite records its Na ₂O content is 3.5 weight %.

The NH that the exchange of 80 gram (dry basis) above-mentioned preparations is had mixed rare earth ions ₄(Zhou village catalyst plant product contains SiO to NaY type zeolite at 100 gram waterglass ₂10 weight %, modulus 3.3) soaked 30 minutes in, 120 ℃ of dryings 2 hours, make molecular sieve contain the SiO of 8.5 weight % by butt then ₂, obtain containing rare earth NH with silicon dipping ₄The NaY zeolite.

70 gram (dry basis) above-mentioned preparations are contained rare earth NH with silicon dipping ₄The roasting 8 hours in 700 ℃ of water vapour atmospheres of NaY zeolite, the product that obtains with 20 times deionized water washing promptly obtains the zeolite that second hole of the present invention is optimized after the drying again, is designated as A-2.Table 2 has provided the composition of A-2, lattice constant, and relative crystallinity and specific area and second hole volume account for the percentage of total pore volume.

The performance of the A-2 zeolite of table 2: embodiment 2 gained

The zeolite numbering	A-2
		Lattice constant, nm	2.450
Relative crystallinity, %	78
		Specific area, m 2/g	668
Total pore volume, ml/g	0.398
		Micro pore volume, ml/g	0.264
The second hole volume, ml/g	0.134
		Second hole volume/total pore volume, %	34
Chemical composition, weight %
		????Na 2O	3.2
????Al 2O 3	20.4
		????SiO 2	63.8
????RE 2O 3	12.6

Embodiment 3

The prepare zeolite that second hole provided by the invention is optimized.

With 100 gram (dry basis) lattice constants is NaY type zeolite (sodium oxide content 14 heavy %, Qilu Petrochemical company Zhou village catalyst plant is produced) and 2 liters of (NH that concentration are 5 heavy % of 2.473 nanometers ₄) ₂SO ₄The aqueous solution carried out ion-exchange 0.5 hour in 60 ℃, filtered, and spent the deionised water filter cake to there not being acid group, obtained NH after the drying ₄NaY type zeolite.

NH with 90 gram (dry basis) above-mentioned preparations ₄NaY type zeolite carries out ion-exchange 0.5 hour under 90 ℃ in the solution of cerium chloride by oxidation of 2 liter of 0.2 M, filter, and spends the deionised water filter cake to there not being acid group, obtains containing the NH of cerium after the drying ₄NaY type zeolite.Record its Na ₂O content is 3.7 weight %.

NH with 80 gram (dry basis) above-mentioned preparations ₄NaY type zeolite soaked 30 minutes in the ammonium fluosilicate solution of 200 milliliters of 0.5M, 120 ℃ of dryings 2 hours, made molecular sieve contain the SiO of 5.6 weight % by butt then ₂, obtain the NH that contains cerium with the silicon dipping ₄The NaY zeolite.

The NH that contains cerium with 70 gram (dry basis) above-mentioned preparations with the silicon dipping ₄The roasting 4 hours in 750 ℃ of water vapour atmospheres of NaY zeolite, the product that obtains with 20 times deionized water washing promptly obtains the zeolite that second hole of the present invention is optimized after the drying again, is designated as A-3.Table 3 has provided the composition of A-3, lattice constant, and relative crystallinity and specific area and second hole volume account for the percentage of total pore volume.

The performance of the zeolite A-3 of table 3: embodiment 3 gained

The zeolite numbering	?A-3
		Lattice constant, nm	?2.452
Relative crystallinity, %	?75
		Specific area, m 2/g	?644
Total pore volume, ml/g	?0.398
		Micro pore volume, ml/g	?0.242
The second hole volume, ml/g	?0.156
		Second hole volume/total pore volume, %	?39
Chemical composition, weight %
		????Na 2O	?3.2
????Al 2O 3	?20.6
		????SiO 2	?64.4
????CeO 2	?11.8

Embodiment 4

Second hole optimization provided by the invention contain the cerium prepare zeolite.

With 100 grams (dry basis), lattice constant is ultrastable (the sodium oxide content 0.8 heavy % of 2.443 nanometers, the Zhou village catalyst plant is produced) with 2 liters of concentration be that 0.2 mole the cerium chloride aqueous solution carried out ion-exchange 0.5 hour in 90 ℃, filter, spend the deionised water filter cake to there not being acid group, obtain containing the ultrastable of cerium after the drying.

The ultrastable that contains cerium and 2 liters of Na that concentration is 5 heavy % with the above-mentioned preparation of 90 grams ₂SO ₄The aqueous solution carried out ion-exchange 0.5 hour in 60 ℃, filtered, and spent the deionised water filter cake to there not being acid group, obtained containing the HNaY zeolite of cerium after the drying, recorded its Na ₂O content is 4.2 weight %.

The HNaY type zeolite that contains cerium of the above-mentioned preparation of 80 grams is being contained SiO ₂5.0 soaked in the dimethyl-silicon aqueous solution of weight % 30 minutes, and 120 ℃ of dryings 2 hours, made molecular sieve contain the SiO of 4.5 weight % by butt then ₂, obtain the HNaY type zeolite that contains cerium with the silicon dipping.

70 grams with the roasting 20 hours in 700 ℃ of water vapour atmospheres of the HNaY type zeolite that contains cerium of silicon dipping, are washed the product that obtains with 20 times deionized water again, and what can obtain second hole optimization after the drying contains cerium zeolite A-4.Table 4 has provided the composition of A-4, lattice constant, and relative crystallinity and specific area and second hole volume account for the percentage of total pore volume.

The performance of the zeolite A-4 of table 4: embodiment 4 gained

The zeolite numbering	?A-4
		Lattice constant, nm	?2.435
Relative crystallinity, %	?70
		Specific area, m 2/g	?598
Total pore volume, ml/g	?0.350
		Micro pore volume, ml/g	?0.171
The second hole volume, ml/g	?0.179
		Second hole volume/total pore volume, %	?51.1
Chemical composition, weight %
		????Na 2O	?3.8
????Al 2O 3	?18.8
		????SiO 2	?72.6
????CeO 2	?4.8

Embodiment 5

The prepare zeolite that second hole provided by the invention is optimized.

With 100 gram (dry basis) lattice constants is REHY type zeolite (sodium oxide content 0.6 heavy %, Qilu Petrochemical company Zhou village catalyst plant is produced) and 2 liters of (Na) that concentration are 5 heavy % of 2.466 nanometers ₂SO ₄The aqueous solution carries out ion-exchange 0.5 hour under 60 ℃, filter, and spends the deionised water filter cake to there not being acid group, gets the higher REHY type zeolite of sodium content after the drying.

Restrain the mixed chlorinated rare earth (La that by total rare earth (TRE) contain 45.45 weight %s of the REHY type zeolite of (dry basis) above-mentioned preparations with 90 at 1 liter of 30.8 weight %, 10.58 the Ce of weight %, and other rare earth of 43.97 weight %) under 90 ℃, carries out ion-exchange 0.5 hour in the solution, filter, spend the deionised water filter cake to there not being acid group, obtain exchanging the y-type zeolite of mixed rare earth ions after the drying, record its Na ₂O content is 3.5 weight %.

(Zhou village catalyst plant product contains SiO to the y-type zeolite that the exchanges of 80 gram (dry basis) above-mentioned preparations are had a mixed rare earth ions at 100 gram waterglass ₂10%, modulus 3.3) soaked 30 minutes in, 120 ℃ of dryings 2 hours, make molecular sieve contain the SiO of 8.0 weight % by butt then ₂, obtain the rare earth exchanged Y zeolite that contains with the silicon dipping.

With 70 gram (dry basis) above-mentioned preparations with silicon dipping contain rare earth exchanged Y zeolite roasting 8 hours in 700 ℃ of water vapour atmospheres, the product that obtains with 20 times deionized water washing more promptly obtains the zeolite of second hole optimization of the present invention after the drying, be designated as A5.Table 5 has provided the composition of A5, lattice constant, and relative crystallinity and specific area and second hole volume account for the percentage of total pore volume.

The performance of table 5:A5 zeolite

The zeolite numbering	?A5
		Lattice constant, nm	?2.456
Relative crystallinity, %	?73
		Specific area, m 2/g	?646
Total pore volume, ml/g	?0.390
		Micro pore volume, ml/g	?0.244
The second hole volume, ml/g	?0.146
		Second hole volume/total pore volume, %	?37
Chemical composition, weight %
		????Na 2O	?3.2
????Al 2O 3	?19.4
		????SiO 2	?62.8
????RE 2O 3	?14.6

Comparative Examples 1

This Comparative Examples illustrates the preparation and the effect thereof of conventional rare earth superstable Y-type molecular sieve.

According to the preparation method of conventional rare earth superstable Y-type molecular sieve, getting silica alumina ratio is 4.9, and lattice constant is 2.465 nanometers, and degree of crystallinity is that 90% NaY molecular sieve is by NaY: RECl ₃: NH ₄Cl: H ₂O=1: 0.3: 0.5: 20 weight ratio uses NaY the solution of being made up of ammonium chloride and mixed chlorinated rare earth in 90 ℃ of exchanges 30 minutes, the roasting 2 hours under 570 ℃ of 100% steam atmosphere of filter cake after the filtration, then by above-mentioned condition exchange again, roasting once, obtain rare earth superstable Y-type molecular sieve, be designated as B-1.Its chemical composition, lattice constant, relative crystallinity and second hole volume account for the percentage of total pore volume and list in the table 6.

The performance of the zeolite B-1 of table 6 Comparative Examples 1 gained

The zeolite numbering	B-1
		Lattice constant, nm	2.449
Relative crystallinity, %	76
		Total pore volume, ml/g	0.323
Micro pore volume, ml/g	0.258
		The second hole volume, ml/g	0.065
Second hole volume/total pore volume, %	20.1
		Chemical composition, weight %
????Na 2O	1.2
		????Al 2O 3	19.4
????SiO 2	77.6
		????RE 2O 3	1.5

Comparative Examples 2

This Comparative Examples provides a kind of effect of the Y zeolite that makes according to the method for describing among the CN1005387B.

List in the table 7 according to its performance of Y zeolite sample B-2 that the embodiment among the CN1005387B 5 makes.

The performance of the zeolite B-2 of table 7 Comparative Examples 2 gained

The zeolite numbering	B-2
		Lattice constant, nm	2.442
Relative crystallinity, %	75
		Total pore volume, ml/g	0.355
Micro pore volume, ml/g	0.286
		The second hole volume, ml/g	0.069
Second hole volume/total pore volume, %	19.4
		Chemical composition, weight %
????Na 2O	0.60
		????Al 2O 3	14.0
????SiO 2	72.3
		????RE 2O 3	12.6

Embodiment 6

This example explanation y-type zeolite and the catalytic performance that contrasts zeolite that contains the second hole structure with optimization of rare earth provided by the invention.

60 gram boehmites and 70 gram water are mixed, and under agitation adding 20 gram concentration is 36% concentrated hydrochloric acid, is warming up to 70 ℃, aging 1.5 hours, and the boehmite that obtains wearing out.

The 50 y-type zeolite Al and 70 that restrain the second hole structure with optimization that contains rare earth of (dry basis) embodiment 1 preparation are restrained the aluminium colloidal sols, and 70 gram kaolin and above-mentioned boehmite mixed, in 500 ℃ of roastings 2 hours.

The above-mentioned product that obtains is pulverized, successively 1. contained HCl 0.84% and NH in the sample butt down with 20 times of weight at 60 ℃ ₃H ₂2. the acid solution of O 0.62% contains NH ₃H ₂The alkali lye of O 0.17% and 3. deionized water mixing making beating washing, filtration obtain catalyst C1 provided by the invention after the drying.

Prepare the catalyst D1 that contains conventional hyperastable Y-type RE zeolite (B1), agent as a comparison according to above-mentioned same procedure.

The catalyst C1 and the D1 of gained are estimated on small fixed flowing bed, and the raw material oil properties sees Table 8, and evaluation result sees Table 9.

Table 8 feedstock oil character

Project	Index
		Density (20 ℃), g/cm 3	?0.9044
Kinematic viscosity, mm 2/s
		????50℃	?57.69
????100℃	?9.96
		Freezing point, ℃	?40.0
Carbon residue, m%	?2.97
		Molecular weight (actual measurement)	?390
?C 7Insoluble matter	?0.37
		C, weight %	?85.98
H, weight %	?12.86
		S, weight %	?0.55
Alkali nitrogen, ppm	?1000
		Boiling range, ℃
Initial boiling point	??243
		????5％	??294
????10％	??316
		????30％	??395
????50％	??429
		????70％	??473
Characteristic factor	??11.9

Table 9 evaluation result

Catalyst	C1	?D1
			Reaction temperature, ℃	500	?500
Oil ratio	6	?6
			Air speed, hour-1	16	?16
Material balance, weight %
			????H 2～C 2	1.36	?1.25
Liquefied gas	10.49	?9.60
			????C 5+ gasoline	59.48	?59.60
Diesel oil	18.38	?17.45
			Heavy oil	5.37	?7.19
Coke	4.92	?4.91

Claims (10)

1, a kind of improved rare earth Y type zeolite is characterized in that its relative crystallinity is 65～85%, and its content of rare earth is (with RE ₂O ₃Meter) be 1～17 weight %, its second hole volume accounts for 20～80% of total pore volume.

2, according to the zeolite of claim 1, wherein the second hole volume accounts for 25～70% of total pore volume.

3, according to the zeolite of claim 1, wherein said rare earth element is La or Ce or based on the mixed rare-earth elements of La and/or Ce.

4, a kind of preparation method of improved rare earth Y type zeolite is characterized in that this method comprises, with Na ₂O content is that the rare earth Y type zeolite of 2.5～8 weight % is dry then with a kind of siliceous solution impregnation, makes said rare earth Y type zeolite contain the silicon of said dipping of 1～15 weight % (with SiO ₂Meter), then gained is contained flood silicon rare earth Y type zeolite in steam atmosphere in 500～850 ℃ of hydrothermal calcines 0.5～30 hour; Wherein said siliceous solution is selected from Ludox, waterglass, fluosilicate or organic silicon solution.

5, according to the method for claim 4, wherein the condition of said hydrothermal calcine is 550～800 ℃ of following hydrothermal calcines 1～24 hour.

6, according to the method for claim 5, wherein the condition of said hydrothermal calcine is 600～750 ℃ of following hydrothermal calcines 2～20 hours.

7, according to the method for claim 4, wherein said siliceous solution is Ludox, waterglass or fluosilicate.

8, according to the method for claim 7, wherein said siliceous solution is Ludox or waterglass.

9, according to the method for claim 4, wherein said Na ₂O content is that 3～8 rare earth Y type zeolite is that lattice constant is REY type zeolite, REHY type zeolite or the extremely steady y-type zeolite of rare earth of 2.440～2.475 nanometers.

10, according to the method for claim 4, wherein said organosilicon is dimethicone or polymethylphenyl siloxane fluid.