CN1052133A

CN1052133A - Assisted catalyst for catalyzing cracking with high octane number

Info

Publication number: CN1052133A
Application number: CN 89108834
Authority: CN
Inventors: 舒兴田; 何呜元; 傅维; 张淑琴
Original assignee: Sinopec Research Institute of Petroleum Processing
Current assignee: Sinopec Research Institute of Petroleum Processing
Priority date: 1989-11-30
Filing date: 1989-11-30
Publication date: 1991-06-12
Anticipated expiration: 2004-11-30
Also published as: CN1020280C

Abstract

A kind of assisted catalyst for catalyzing cracking is with SiO ₂, Al ₂O ₃Or SiO ₂Al ₂O ₃One of be carrier, the heavy % of load 10～40 contain that the five-membered ring structure high-silicon zeolite of rare earth constitutes.This supersiliceous zeolite has the x-ray diffraction spectra of ZSM-5 zeolite family, but the aperture is more narrow than ZSM-5, and its anhydrous chemical expression is XRE ₂O ₃, YNa ₂OAl ₂O ₃ZSiO ₂, wherein X=0.01～0.30, Y=0.4～0.6, Z=20～100.It is high product gasoline octane rating bucket and lower coking yield that this promotor has more conventional ZSM-5 or REZSM-5 promotor.

Description

Assisted catalyst for catalyzing cracking with high octane number

The invention relates to a kind of promotor that is used for catalytic cracking of hydrocarbon and preparation method thereof, exactly, about a kind of catalytic cracking of hydrocarbon promotor of improving product gasoline octane rating bucket, rare earth containing high silica zeolite and preparation method thereof that is used to.

In order to reduce environmental pollution, people are more and more stricter with quantitative limitation to tetraethyl lead in the gasoline, and the octane value that improves white gasoline becomes a pressing problem.One of approach that addresses this problem is to add the ZSM-5 zeolite to improve the octane value of catalytically cracked gasoline in the catalytic cracking reaction system.

ZSM-5 be a kind ofly have five-membered ring structure, the aperture is the supersiliceous zeolite of 0.54 * 0.56 nanometer, its framework si-al ratio is more than 12.Because this class zeolite aligns, the isomery hydro carbons has the characteristic of selecting shape absorption, therefore can be used for selective splitting low octane rating normal paraffin, improve gasoline octane rating (USP3,894,931) effectively.For many years, people are carrying out the work that improves ZSM-5 zeolite shape selective catalysis cracking performance always.For example, USP4 has reported in 552,648 with the pretreated method of hydro-thermal and has reduced the α value of ZSM-5 zeolite and then reduce the fall of gasoline yield, EP156 has introduced the ZSM-5 zeolite that uses big crystal grain can be received boosting of octane rating as catalytic cracking additive effect in 490; USP4 proposes a spot of Ag of ZSM-5 zeolite in 549,956 ⁺Carry out exchange energy and reach the purpose of boosting of octane rating; USP4 also proposes ZSM-5 zeolite and NH in 416,765 ⁺ ₄Be aided with RE after the exchange again ³⁺Exchange can improve the catalytic selectivity of zeolite.

Aspect of performance is all obtained certain progress although all above-mentioned these are operated in improvement ZSM-5 zeolite catalysis, yet when improving gasoline octane rating, can cause gasoline yield more significantly to descend inevitably, so that influence total economic benefit, though this loss can be by the C of volume increase ^- ₃, C ^- ₄Alkylation remedy (J.Oil ﹠amp; Gas, 83(19), 108,1985), but for no alkylation process, do not allow the application of the existing ZSM-5 zeolite additive in refinery of gasoline yield minimizing just to be restricted again.

At the problems referred to above that existing ZSM-5 zeolite exists, the purpose of this invention is to provide a kind of catalytic cracking of hydrocarbon promotor of gasoline yield and preparation method of this promotor of when improving gasoline octane rating, improving in catalytic cracking is used.

Promotor provided by the present invention is with SiO ₂, Al ₂O ₃Or SiO ₂.Al ₂O ₃One of be carrier, the heavy % of load 10～40 contain that the five-membered ring structure high-silicon zeolite of rare earth constitutes.Its preparation method is as follows: with one of silica gel, aluminium glue or alumino silica gel and the five-membered ring structure high-silicon zeolite that contains rare earth according to 90～60: 10～40 weight ratio is mixed, spray drying forming behind the homogeneous, the particle NH after the moulding ⁺ ₄Exchange also is washed to Na ₂O content promptly gets promotor provided by the present invention less than 0.15 heavy % after the drying.SiO in the said alumino silica gel ₂Content should be 55～95 heavy %, best 70～90 heavy %, it both can make by glue method altogether, also can make by step-by-step precipitation method.

The said five-membered ring structure high-silicon zeolite that contains rare earth has the x-ray diffraction spectra of ZSM-5 zeolite family among the present invention, sees Table 1 column data; Because of it has than ZSM-5 is the big absorption ratio to normal hexane/hexanaphthene, is little aperture so this supersiliceous zeolite has than ZSM-5; Its anhydrous state chemical constitution formula is as follows: XRE ₂O ₃YNa ₂OAl ₂O ₃ZSiO ₂, wherein X=0.01～0.30, Y=0.4～0.6, Z=20～100.

Continuous table 1

VS：80～100%;S：60～80%;M：40～60%;W：20～40%;VW：＜20%。

The preparation method of the said five-membered ring structure high-silicon zeolite that contains rare earth is as follows among the present invention:

1, in the NaY zeolite be initiator make contain rare earth 2～23%, sodium≤5.0%(all with oxide weight) REY or REHY zeolite;

2, be crystal seed with above-mentioned REY or REHY zeolite, with its be evenly dispersed in be used for conventional synthetic ZSM-5 zeolite contain any organic amine, Na ₂O, Al ₂O ₃, SiO ₂, H ₂In the colloidal state system of O, the consumption of crystal seed is with each self-contained Al in crystal seed and the colloidal state system ₂O ₃Weight ratio be 0.05～7.0 to be advisable;

3, the colloidal state system that will contain crystal seed is at 130～200 ℃, leaves standstill crystallization 16～60 hours under best 150～180 ℃, and best 18～28 hours, after filtration, wash, be drying to obtain the five-membered ring structure high-silicon zeolite that contains rare earth provided by the present invention.

Wherein said REY prepare zeolite method as crystal seed is as follows: with NaY zeolite and re chloride according to zeolite (base burns): RECl ₃: H ₂O is 1: 0.01～1.0: 10～100, is preferably 1: 0.1～0.4: 20～50 weight ratio is at 50～150 ℃, and best 60～120 ℃ of exchanges 0.2～2.0 hour are down filtered, and filter cake was 400～600 ℃ of roastings 0.5～4.0 hour.Zeolite after the roasting can carry out the exchange second time, roasting as stated above.

Wherein said REHY prepare zeolite method as crystal seed is as follows: with NaY zeolite and ammonium sulfate solution according to zeolite (base burns): (NH ₄) ₂SO ₄: H ₂O is 1: 0.2～4.0: 10～40, is preferably 1: 0.8～2.0: 20～30 weight ratio is at 50～150 ℃, best 80～120 ℃ of exchanges 0.2～2.0 hour down.This exchange step can repeat 1～2 time.Filter filter cake 400～600 ℃ of roastings 0.5～4.0 hour in the dry air that flows.Zeolite after the roasting and re chloride are according to zeolite (base burns): RECl ₃: H ₂O is 1: 0.05～1.0: 10～100, and best 1: 0.2～0.8: 20～50 weight ratio is at 50～150 ℃, and best 80～120 ℃ exchange 0.2～2.0 hour down, filter.

The promotor that contains the five-membered ring structure high-silicon zeolite of rare earth provided by the invention has the characteristics that improve product gasoline octane rating bucket and reduce coking yield when improving transformation efficiency.When using this promotor in catalytic cracking process, the add-on of this promotor accounts in the supersiliceous zeolite add-on can have obvious effects when 0.25～2.5 of catalyst inventory weighs %.For example, with triumph decompressed wax oil (197～479 ℃ of boiling ranges) is that stock oil adds promotor provided by the present invention when carrying out catalytic cracking, when making the five-membered ring structure high-silicon zeolite that contains rare earth account for 1 weight % of base catalyst reserve, the more conventional cracking catalyst of gasoline octane rating bucket, contain ZSM-5 or the REZSM-5 cracking catalyst improves 4～12% and 6～14% respectively, coking yield contains the ZMS-5 cracking catalyst, contain the REZSM-5 cracking catalyst reduces by 13～20% and 10～17% respectively.

Following example will give further instruction to promotor provided by the present invention and preparation method thereof.

Example 1

The preparation of crystal seed REY and REHY.

Getting silica alumina ratio and be 5.0(X optical diffraction method measures) NaY zeolite 100 grams (base burns), be dispersed in 2500 grams, 1 heavy %RECl ₃(chemical plant, packet header Industrial products wherein contain Ce ₂O ₃49%, La ₂O ₃24%) in the solution, 90 ℃ of ion-exchange under agitation 30 minutes is filtered, and filter cake was 550 ℃ of following roastings 2 hours.Repeat above-mentioned exchange one roasting once, obtain consisting of RE ₂O ₃19.0%, Na ₂O1.5%, Al ₂O ₃18.5%, SiO ₂61.0% REY zeolite (Na wherein ₂O is recorded by atomic absorption spectrum, and all the other compositions are recorded by the X-ray fluorometric method).

Be that 3.2 and 4.2 NaY zeolite is a starting raw material with silica alumina ratio respectively, make as stated above to form and be respectively RE ₂O ₃22.5%, Na ₂O0.8%, Al ₂O ₃25.8%, SiO ₂50.1% and RE ₂O ₃19.5%, Na ₂O0.5%, Al ₂O ₃22.2%, SiO ₂57.8% REY zeolite.

Get silica alumina ratio and be 5.0 NaY zeolite 100 grams, be dispersed in 2100 grams, 5 heavy %(NH ₄) ₂SO ₄In (Beijing Chemical Plant's product, chemical pure) solution, ion-exchange is 30 minutes under boiling temperature, mends into distilled water constant to keep liquor capacity during exchange at any time.The roasting 2 hours in 550 ℃ of mobile dry air of dope filtration after the exchange, filter cake, the sample after the roasting join 5000 grams, 1 heavy %RECl ₃In the solution, 90 ℃ of ion-exchange under agitation 30 minutes obtains consisting of RE after the filtration ₂O ₃16.0%, Na ₂O0.8%, Al ₂O ₃21.0%, SiO ₂62.2% REHY zeolite.

Example 2～11

Prepare the five-membered ring structure high-silicon zeolite that contains rare earth by method provided by the invention.

Getting a certain amount of (by burning base) is that ethamine (Shanghai insecticide factory Industrial products, the content 40 heavy %) solution of 0.371 grams per milliliter is dispersed in 283 grams and contains Na as the REY of crystal seed or REHY zeolite and 15 ml concns ₂O3.1%, SiO ₂9.9% water glass (Nanjing inorganic chemical industry factory Industrial products, SiO ₂Content 28.0%, modulus 3.2) in the solution, under agitation adds the AlCl of different aluminum contents ₃(Beijing Chemical Plant's product, chemical pure) solution 41.4 grams, PH to 10.5～11.0 of adjusting system with 10 heavy % hydrochloric acid make it to form gel, can calculate the colloidal that generates by charging capacity and consist of: 26C ₂H ₅NH ₂12Na ₂OnRE ₂O ₃Al ₂O ₃100SiO ₂MH ₂O, m=3740 in the example 9,10,11, m=3470 in all the other examples.

Colloid is put into the crystallizing kettle crystallization, cool off, filter, be washed to neutrality then, 110～120 ℃ of oven dry promptly get the said five-membered ring structure high-silicon zeolite that contains rare earth among the present invention.

Each parameter value sees Table 2 in the example.

Above-mentioned each sample all has the listed x-ray diffraction spectra of table 1, and their weight compositional analysis and absorption property analytical resultss are separately listed in table 3 and the table 4 respectively.Na ₂O content is recorded by atomic absorption spectrum, RE ₂O ₃, Al ₂O ₃, SiO ₂Content is recorded by the X-ray fluorometric method.Absorption property is measured with weight absorption instrument, and the sample before the absorption is in advance through 850 ℃ of roastings 2 hours, and adsorptive pressure is 39 mmhg, and adsorption temp is 18～20 ℃, and adsorption time is 2 hours.

Table 3

Example	Compositional analysis, heavy %				Silica alumina ratio *
						RE ₂O ₃	Na ₂0	Al ₂O ₃	SiO ₂
	2 3 4 5 6 7 8 9 10 11	1.5 2.0 0.7 0.5 1.5 1.5 1.5 1.1 0.9 1.2	0.6 0.6 0.8 0.9 0.6 0.6 0.6 0.7 0.8 0.7	2.0 2.2 2.4 2.6 2.0 2.0 2.0 2.2 2.3 2.3						95.9 95.4 96.1 96.0 95.9 95.9 95.9 96.0 96.0 95.8	81.52 73.71 68.07 62.76 81.52 81.52 81.52 74.19 70.96 70.81
ZSM-5 REZSM-5					0 0.45	1.4 0.5	2.2 2.2	96.4 96.85	74.49 74.83

* calculate by compositional analysis.

Table 4

Example	Adsorptive capacity, milligram/gram		The normal hexane adsorptive capacity
					Normal hexane *	Hexanaphthene * *	The hexanaphthene adsorptive capacity
	2 3 4 5 9 10 11	102.5 104.5 103.6 101.5 103.5 101.5 101.5	13.3 10.8 14.4 12.8 12.8 14.5 12.8	7.70 9.68 7.19 7.92 8.09 7.00 7.93
ZSM-5 REZSM-5						112.0 111.8	52.2 55.1	1.98 2.03

* the normal hexane kinetic diameter is 0.43 nanometer;

* hexanaphthene kinetic diameter is 0.61 nanometer.

Example 12

Getting ethylamine solution that 2.0 grams (by burning base) are 0.371 grams per milliliter as REY zeolite (initial NaY silica alumina ratio is 5.0) and 5 ml concns of crystal seed is dispersed in 200 and restrains and contain Na ₂O3.3%, SiO ₂In 10.0% the water glass solution, under agitation add Al ₂O ₃Content is 1.3% AlCl ₃Solution 43.6 grams, PH to 10.5～11.0 of adjusting system with 10 heavy % hydrochloric acid make it to form gel, can calculate the colloidal that generates by charging capacity and consist of: 4.5C ₂H ₅NH ₂4.2Na ₂O0.12RE ₂O ₃Al ₂O ₃38.4SiO ₂1500H ₂O.Colloid is added in the crystallizing kettle, and neutrality, 110～120 ℃ of oven dry are cooled off, filter, are washed to 180 ℃ of crystallization 16 hours then.

This sample has the listed x-ray diffraction spectra of table 1, and its weight compositional analysis and the silica alumina ratio that calculates are thus listed in the table 5.

Table 5

RE ₂O ₃, heavy %	Na ₂0, heavy %	Al ₂O ₃, heavy %	SiO ₂, heavy %	Silica alumina ratio
					1.5	0.7	4.5	93.3	35.25

Comparative example

For comparing, prepare ZSM-5 zeolite and REZSM-5 zeolite by the method for prior art with the said five-membered ring structure high-silicon zeolite that contains rare earth among the present invention.

The ethylamine solution of getting 2.0 gram (burn base) ZSM-5 zeolite (dying of Shanghai seven factory's industrial goods, silica alumina ratio 60) crystal seeds and 15 ml concns and be 0.371 grams per milliliter is dispersed in 283 and restrains and contain Na ₂O3.1%, SiO ₂In 9.9% the water glass solution, stir down slowly adding and contain Al ₂O ₃1.16% AlCl ₃Solution 41.4 grams, PH to 10.5～11.0 of adjusting system with 10 heavy % hydrochloric acid make it to form gel, can calculate the colloidal that generates by charging capacity and consist of: 26C ₂H ₅NH ₂12Na ₂OAl ₂O ₃100SiO ₂3470H ₂O.Colloid is added in the crystallizing kettle about 20 hours of 160～170 ℃ of following crystallization, cool off, filter, be washed to neutrality, 110～120 ℃ then and be drying to obtain the ZSM-5 zeolite.

Get a certain amount of above-mentioned ZSM-5 zeolite that synthesizes through 550 ℃ of roastings after 2 hours, according to zeolite: RECl ₃: the weight ratio of deionized water=1: 0.5: 20,90 ℃ of ion-exchanges twice under agitation, each 30 minutes, filter, 110～120 ℃ are drying to obtain the REZSM-5 zeolite.

The X-ray diffraction data of above-mentioned ZSM-5 and REZSM-5 zeolite, weight compositional analysis and absorption property analytical results are listed in table 1, table 3 and the table 4 respectively.

Example 13

Provided by the invention is active ingredient with the five-membered ring structure high-silicon zeolite that contains rare earth, is that the promotor of carrier has the advantages that to improve product octane value bucket, reduce coking yield with the amorphous aluminum silicide.

1000 grams are contained SiO ₂5 heavy %, Na ₂Water glass (the Nanjing inorganic chemical industry factory product) solution of the heavy % of O1.6 at room temperature mixes the silicon gel that obtains PH6.5～7.5 with 20 heavy % sulfuric acid (Beijing Chemical Plant's product, chemical pure), the aging 200 gram Al that under agitation add after 30 minutes under the room temperature ₂O ₃Content is Tai-Ace S 150 (Beijing Chemical Plant's product, the chemical pure) solution of 5 heavy %, and (Beijing Chemical Plant's product, chemical pure contains NH with ammoniacal liquor in the back that is uniformly dispersed ₃10 heavy %) transfer its pH value to 5.0～5.5 promptly to get and contain SiO ₂83 heavy %, Al ₂O ₃The alumino silica gel of 17 heavy %.

Get ZSM-5, each 15 gram of REZSM-5 zeolite (base burns) of making in the five-membered ring structure high-silicon zeolite that contains rare earth that makes in the example 2,3,4,11,12 and the comparative example respectively, add and join in the above-mentioned alumino silica gel after water grinds, spraying drying behind the homogeneous is used NH then + ₄Exchange and be washed to the Na in the microballoon ₂It is carrier that O＜0.15%, 120 ℃ is drying to obtain with the amorphous aluminum silicide, contain the promotor of 20 heavy % zeolites.

On fixed fluidized bed catalytic cracking unit with triumph decompressed wax oil (197～479 ℃ of boiling ranges, carbon residue amount 0.06 heavy %) be stock oil, poiser with Y-7 cracking catalyst (Zhou village, Shandong catalyst plant Industrial products) is a base catalyst, the bodying agent loading amount is 150 grams, the loading amount of promotor accounts for 1.0 heavy % of bodying agent in zeolite weight, under the reaction conditions of 500 ℃ of temperature of reaction, weight space velocity 8.0, agent-oil ratio (calculating) 4.0, the performance of above-mentioned each promotor is evaluated, be the results are shown in table 6 by bodying agent.Wherein research octane number (RON) system is recorded by chromatography.

Can be found out by table 6 data: promotor provided by the invention can make the transformation efficiency of conventional cracking catalyst improve 12～19%; Octane value bucket raising 6～14%, coking yield than the ZSM-5 promotor reduce by 10～20%.

Example 14～15

Provided by the invention with the five-membered ring structure high-silicon zeolite that contains rare earth be active ingredient, with SiO ₂Or Al ₂O ₃The characteristics that have raising product octane value bucket, reduction coking yield for the promotor of carrier equally.

1000 grams are contained SiO ₂5 heavy %, Na ₂The sodium silicate solution of the heavy % of O1.6 at room temperature is added dropwise to the sulphuric acid soln of 20 heavy % to PH6.5～7.5, keeps aged at room temperature to obtain neutral silicon gel in 30 minutes.The zeolite that makes in the example 2 12.5 grams (base burns) are added join in the above-mentioned silicon gel after water grinds, spraying drying behind the homogeneous is used NH then + ₄Exchange and be washed to the Na in the microballoon ₂O＜0.15%, 120 ℃ is drying to obtain with SiO ₂For carrier, contain the promotor of 20 heavy % zeolites.

50 grams are intended thin water aluminum oxide powder, and (base that burns, Shandong Aluminum Plant's industrial goods contain Al ₂O ₃72 heavy %) be dispersed in the 500 gram water, under room temperature and stirring, be added dropwise to 10 heavy % hydrochloric acid solns 40 grams, continue to stir 15～20 minutes, wore out 1 hour down at 60 ℃ then, obtain the aluminium glue of PH2.9.The zeolite that makes in the example 2 12.5 grams (base burns) are added join in the above-mentioned aluminium glue after water grinds, spraying drying behind the homogeneous is used NH then + ₄Exchange and be washed to the Na in the microballoon ₂O＜0.15%, 120 ℃ is drying to obtain with Al ₂O ₃For carrier, contain the promotor of 20 heavy % zeolites.

According to method described in the example 13 performance of above-mentioned two promotors is evaluated, and be that carrier contains 20 heavy % example 2 zeolite promotors, contains 20 heavy %ZSM-5 promotors and compare with the sial, the results are shown in table 7.

Table 7

Catalyzer	Bodying agent	Add the silica-alumina supports auxiliary agent	Add SiO ₂The carrier auxiliary agent	Add Al ₂O ₃The carrier auxiliary agent	Add the ZSM-5 auxiliary agent
						Material balance; Heavy % H2-C2 C3-C4 gasoline, diesel heavy oil coke conversion ratio, heavy % research octane number (RON) octane number bucket	1.76 17.76 47.24 20.67 8.95 3.62 70.38 88.6 4185.5	2.46 23.67 50.48 13.28 6.41 3.70 80.31 90.3 4558.3	2.26 22.40 50.20 14.00 7.46 3.68 78.54 90.5 4543.1	2.50 24.00 49.80 15.00 4.96 3.74 80.04 90.5 4506.9	2.30 25.71 44.85 16.20 6.89 4.58 76.91 91.8 4117.2

Example 16

This example illustrates that the consumption of promotor provided by the invention is to base catalyst catalytic cracking Effect on Performance.

The promotor that contains example 2 zeolites that makes in the example 13 is estimated according to method described in the example 13, and the add-on of promotor weighs % with 0.25 heavy %, the 1.0 heavy % and 2.0 that the score of supersiliceous zeolite add-on does not account for catalyst inventory, and evaluation result is listed in table 8.

Table 8

Catalyzer	Bodying agent	The auxiliary agent mesolite accounts for reserve 0.25 heavy %	And the agent mesolite accounts for reserve 1.0 heavy %	The auxiliary agent mesolite accounts for reserve 2.0 heavy %
					Material balance; Heavy % H2-C2 C3-C4 gasoline, diesel heavy oil coke conversion ratio, heavy % research octane number (RON) octane number bucket	1.76 17.76 47.24 20.67 8.95 3.62 70.38 88.6 4185.5	2.00 21.76 48.24 17.34 7.00 3.66 75.66 90.2 4351.2	2.46 23.67 51.48 13.28 6.41 3.70 80.31 90.3 4558.3	2.60 27.48 50.00 11.00 4.96 3.96 84.04 90.5 4525.0

Claims

1, a kind of assisted catalyst for catalyzing cracking is characterized in that:

(1) it is with SiO ₂, Al ₂O ₃Or SiO ₂, Al ₂O ₃One of the five-membered ring structure high-silicon zeolite of rare earth constitutes for carrier, load 10～40 heavy % contain;

(2) this supersiliceous zeolite has the x-ray diffraction spectra of ZSM-5 zeolite family, but the aperture is more narrow than ZSM-5, and its anhydrous chemical expression is XRE ₂O ₃YNa ₂OAl ₂O ₃ZSiO ₂, wherein X=0.01～0.30, Y=0.4～0.6, Z=20～100;

(3) this promotor prepares by following method: with silica gel, aluminium glue or SiO ₂Content be one of alumino silica gel of 55～95 heavy % with the five-membered ring structure high-silicon zeolite that contains rare earth according to 90～60: 10～40 weight ratio is mixed, spray drying forming behind the homogeneous, the particle NH4 after the moulding ⁺Exchange also is washed to Na ₂O content is less than 0.15 heavy %, drying;

(4) this supersiliceous zeolite prepares by following method: in the REY or the REHY zeolite that contain rare earth 2～23%, sodium≤5.0% (all with oxide weight) is crystal seed, with crystal seed be evenly dispersed in be used for conventional synthetic ZSM-5 zeolite contain any organic amine, Na ₂O, Al ₂O ₃, SiO ₂, H ₂In the colloidal state system of O, the consumption of crystal seed is 0.05～7.0 to be advisable with the weight ratio of each self-contained Al203 in crystal seed and the colloidal state system, leaves standstill 16～60 hours after-filtration of crystallization, washing, drying under 130～200 ℃;

(5) used REY zeolite seed crystal prepares by following method: with NaY zeolite and chlorination dilute solution according to zeolite (base burns): RECl ₃: H ₂O is 0.01～1.0: 10～100 weight ratio 50～150 ℃ of exchanges 0.2～2.0 hour down, filters, and filter cake is 400～600 ℃ of roastings 0.5～4.0 hour, and the zeolite after the roasting can repeat that above-mentioned steps carries out exchanging second time, roasting;

(6) used REHY zeolite seed crystal prepares by following method: with NaY zeolite and ammonium sulfate solution according to zeolite (base burns): (NH ₄) ₂SO ₄: H ₂O is 1: 0.2～0.4: 10～40 weight ratio 50～150 ℃ of exchanges 0.2～2.0 hour down, this exchange step can repeat 1～2 time, filter, filter cake 400～600 ℃ of roastings 0.5～4.0 hour in the dry air that flows, the zeolite after the roasting and re chloride are according to zeolite (it is basic to burn): RECl ₃: H ₂O is 1: 0.05～1.0: 10～100 weight ratio 50～150 ℃ of exchanges 0.2～2.0 hour down, filters.

2, according to the described promotor of claim 1, SiO in the said alumino silica gel in its feature (3) ₂Content is 70～90 heavy %.

3, according to the described promotor of claim 1, the said crystallization that leaves standstill was carried out under 150～180 ℃ 18～28 hours in its feature (4).

4, according to the described promotor of claim 1, said NaY zeolite and re chloride are according to zeolite (base burns): RECl in its feature (5) ₃: H ₂O is that 1: 0.1～0.4: 20～50 weight ratio exchanges under 60～120 ℃.

5, according to the described promotor of claim 1, said NaY zeolite and ammonium sulfate solution are according to zeolite (burn base) in its feature (6): (NH ₄) ₂SO ₄: H ₂O is that 1: 0.8～2.0: 20～30 weight ratio exchanges under 80～120 ℃.

6, according to the described promotor of claim 1, said zeolite and re chloride are according to zeolite (base burns): RECl in its feature (6) ₃: H ₂O is that 1: 0.2～0.8: 20～50 weight ratio exchanges under 80～120 ℃.

7, the described supersiliceous zeolite promotor of claim 1 catalytic cracking that is used to improve product gasoline octane rating bucket.