CN107971001A

CN107971001A - It is a kind of containing rich in mesoporous assistant for calalytic cracking of Beta molecular sieves and preparation method thereof

Info

Publication number: CN107971001A
Application number: CN201610921658.5A
Authority: CN
Inventors: 陈振宇; 朱玉霞; 周灵萍; 张蔚琳; 田辉平; 刘建强; 罗斌; 罗一斌
Original assignee: Sinopec Research Institute of Petroleum Processing; China Petroleum and Chemical Corp
Current assignee: Sinopec Research Institute of Petroleum Processing; China Petroleum and Chemical Corp
Priority date: 2016-10-21
Filing date: 2016-10-21
Publication date: 2018-05-01
Anticipated expiration: 2036-10-21
Also published as: CN107971001B

Abstract

The invention discloses a kind of containing rich in mesoporous assistant for calalytic cracking of Beta molecular sieves and preparation method thereof, by weight and on the basis of the butt weight of the auxiliary agent, the auxiliary agent contain the 10 75 weight % in terms of butt rich in mesoporous Beta molecular sieves, the clay of 0 60 weight % in terms of butt, the inorganic oxide binder of 15 60 weight % in terms of butt, with P₂O₅The phosphorus additive of 0 25 weight % and VIII race's metallic addition of the 0 15 weight % in terms of oxide of meter, wherein, the Al distributed constants D of the molecular sieve meets：0.4≤D≤0.8；The micropore specific area of the molecular sieve is 350 500 meters²/ gram, the ratio that the mesopore volume of the molecular sieve accounts for total pore volume is 30 70 body %.The auxiliary agent of the present invention can be improved to the yield of isobutene and propylene applied to catalytic cracking, improve octane number.

Description

A kind of assistant for calalytic cracking containing rich in mesoporous Beta molecular sieves and its preparation Method

Technical field

The present invention relates to a kind of containing rich in mesoporous assistant for calalytic cracking of Beta molecular sieves and preparation method thereof.

Background technology

Low-carbon alkene alkene is important Organic Chemicals, and the whole world all increases the demand of low-carbon alkene year by year.Fluidisation is urged It is one of important process for producing low-carbon alkene to change cracking, and for most of catalytic cracking units, addition auxiliary agent is volume increase The effective technical way of low-carbon alkene.But the prior art is to improving isobutylene concentration effect unobvious in liquefied gas.From FCC processes Isobutene generation sees that beta-molecular sieve (also referred to as β zeolites, beta molecular sieves) is a kind of effective active component with reactive chemistry.β points It is easily to be damaged its structure during its template is removed on the one hand that son, which sieves main problem in use and embodies, Evil, be on the other hand during the reaction easy dealuminzation thus activity stability it is poor.

Some Cracking catalyst or auxiliary agent for containing β zeolites are disclosed in the patent of early stage, octane number can be improved, Increased low carbon olefine output, liquefied gas, such as United States Patent (USP) US4740292, US4898846, US4911823 and WO95026533 are special Profit.β zeolite some in these patents is emphasized to emphasize as high silica alumina ratio zeolite for low sodium h-type zeolite, some.High silica alumina ratio β can directly synthesize, can also be obtained by hydro-thermal process or acid treatment.

United States Patent (USP) US4837396 discloses a kind of catalyst, containing β zeolites and Y zeolites, and contains metal ion type Compound improves the hydrothermal stability and mechanical strength of catalyst as stabilizer.The stabilizer can be [Al₂(OH)₅Cl]_x, Either Al₃Zr(OH)₉Cl₄.Stabilizer can be acted on directly with β zeolites, can also be added in catalyst process is prepared.

United States Patent (USP) US6355591 discloses a kind of assistant for calalytic cracking, the aluminum phosphate containing 4-20%, 1-40%'s ZSM-5, β and its mixture, the clay of 40-90%, can improve LPG yield.The preparation method of aluminum phosphate is：Concentrated phosphoric acid adds Diluted in deionized water, add aluminium powder dissolving, wherein Al and PO₄Molar ratio be 1:3, pH are less than 2.0.Obtained aluminum phosphate It is uniformly mixed with kaolin, is blended into molecular sieve pulp, finally spraying shaping.In terms of Patent right requirement, which is free of and removes Other binding agents, other inorganic oxides outside aluminum phosphate.In addition, the auxiliary agent system of the zeolite containing β is not provided in the embodiment of the patent Preparation Method and performance.

A kind of method of modifying of beta-molecular sieve is proposed in Chinese patent CN 1043450A, this method is to pass through Na beta-molecular sieves Part framework aluminum is pumped with acid after roasting, then carrying out potassium exchange makes zeolite potassium content for 0.5-2.5 weight %, through drying, roasting Afterwards with including potassium hydrogen phosphate-potassium dihydrogen phosphate, hypophosphorous acid-potassium hypophosphite, phosphorous acid-potassium phosphite, weakly acidic pH Microcosmic salt buffer solution soak at room temperature 4-10 it is small when, washing or not washing as one sees fit makes phosphorus content on zeolite be 0.01-0.5 Weight %, then dry, roasting；The hydrocarbon for being suitable as being related to hydroisomerization reaction by the modified beta-molecular sieve of this method Processing catalyst.

A kind of method of modifying of beta-molecular sieve is proposed in Chinese patent CN 1179994A, this method uses Na beta-molecular sieves Ammonium ion exchanges the Na to zeolite₂O content is less than 0.1 heavy %；Then the beta-molecular sieve that above-mentioned ammonium exchanges is pumped with acid treatment Part framework aluminum, makes its silica alumina ratio be more than 50；Beta-molecular sieve after above-mentioned dealuminzation and phosphoric acid or phosphate are dried after mixing It is dry, make P on gained zeolite₂O₅Amount for 2-5 weight %；It is finally small with 450-650 DEG C of hydrothermal calcine 0.5-4 under water vapour atmosphere When.Higher alkene can be obtained in the cracking reaction for hydro carbons by the modified beta-molecular sieve of this method, it is especially different The yield of structure alkene and relatively low coke yield.

Chinese patent CN1205249A discloses a kind of method of modifying of β zeolites, and this method includes the β zeolites that will synthesize Original powder is with containing Al₂O₃Source, P₂O₅Source, SiO₂Source, H₂O₂And the mixture of water is according to β zeolites:Al₂O₃:P₂O₅:SiO₂:H₂O₂: H₂O=1:(0.001~0.02):(0.01~0.30):(0~0.05):(0~0.10):The weight ratio mixing of (1.0~3.0) Uniformly, after drying, then be warming up to 400~650 DEG C roasting 1~5 it is small when, then exchanged with conventional method through ammonium ion to it Na₂O content is less than 0.1 weight %, and this method can make the activity stability of β zeolites be significantly improved, while can also make it Crystallization reservation degree is improved.

Chinese patent CN1616351 discloses a kind of preparation method of phosphorous β zeolites, is by silicon source, alkali source and tetraethyl Ammonium cation solution is made into working solution in water, using the silica gel that granularity is 20-300 mesh as silicon source, silica gel and the work is molten Liquid mixes, and silica gel particle surface is soaked by the working solution, keeps that crystal seed is made when 20-80 is small at 80-140 DEG C Glue；The aluminum phosphate of crystal seed glue charged material weight 5-30% is added in the above-mentioned crystal seed glue being prepared into again, is existed after mixing When crystallization 50-100 is small at 140-170 DEG C, solid product is isolated, is washed to Na₂O content is less than 0.1 weight %, after dry .This method can prepare the β zeolites that phosphorus content is up to 5 weight %, be urged when in for alkylated reaction with higher Change selectivity.

Chinese patent CN1872685A discloses a kind of modified beta molecular sieve, it is characterised in that the anhydrous chemical of the beta-molecular sieve Expression formula, (0-0.3) Na is calculated as with the quality of oxide₂O·(0.5-10)Al₂O₃·(1.3-10)P₂O₅·(0.7-15) M_xO_y·(70-97)SiO₂, wherein, the one kind of M in Fe, Co, Ni, Cu, Mn, Zn and Sn.The zeolite is applied to catalytic cracking In, can be as the active component of catalyst or auxiliary agent.

Chinese patent CN101434401A discloses a kind of phosphorous beta-molecular sieve, it is characterised in that described beta-molecular sieve phosphorus Content is with P₂O₅0.01~10 heavy % is calculated as, thermogravimetric is characterized in collection of illustrative plates a weightless peak occurs at 220 ± 25 DEG C.The molecular sieve is After beta-molecular sieve to be roasted to removing organic formwork agent in air atmosphere, then with phosphorus-containing compound aqueous solution in 100~250 DEG C of temperature What degree was handled.

Chinese patent CN101450318A discloses a kind of method of modifying of beta-molecular sieve, it is characterised in that by sodium form beta molecule Sieve is according to molecular sieve:Ammonium salt:H₂O=1:(0.1~1):The weight ratio of (5~10) is small to exchange 0.3~1 at 100 DEG C in room temperature When after filter, then the solution with phosphorus-containing compound solution and containing metallic compound carries out dipping modification to molecular sieve, wherein soaking It is 6~8 that stain liquid, which adjusts pH, then dry, roasting.

Chinese patent CN102971065A and CN105312081A disclose one kind and are used for NO_xReduction it is new containing metal Zeolite beta.Organic structure directing agent (SDA) is not required in its preparation process.Metal can include Fe or Cu containing 1-10wt%.Also Disclose the method using the nitrogen oxides in disclosed zeolite selective catalytic reduction exhaust gas.

Chinese patent CN103447068A discloses a kind of catalytic cracking catalyst auxiliary agent of zeolite containing β and applies the patent It is related to one kind and is suitable for catalytic cracking reaction, and liquid can be increased and receive, reduce coke, the zeolite beta catalyst agent aid of propylene enhancing.It is logical Cross and kaolin microsphere in-situ crystallization β zeolites are modified, are demoulded and aging is to prepare catalyst promoter, and split applied to catalysis Change reaction.By the microspheroidal zeolite beta catalyst agent aid of in-situ crystallization, the base catalyst of 2~50wt% of substitution, with binder method Obtained zeolite beta catalyst agent aid is compared, and in-situ crystallization method β zeolite builders have stronger propylene enhancing, anti-coking and increasing Liquid feeding receives ability.

Chinese patent CN103771437A discloses a kind of phosphorous modified beta molecular sieve, it is characterised in that with P₂O₅Count phosphorus Content accounts for 3-10 weight %, the molecular sieve²⁷In Al MAS NMR, chemical shift is 40 ± 3ppm resonance signals peak area with changing Displacement study is more than or equal to 1 for the ratio between 54ppm ± 3ppm resonance signal peak areas.Phosphorus and framework aluminum coordination are abundant in the molecular sieve, Framework aluminum is adequately protected, and has excellent hydrothermal stability and more preferable product selectivity.

Chinese patent CN103785455A discloses a kind of cracking additive for improving catalytic cracking low-carbon olefin concentration, including The phosphorus and transition metal modified beta-molecular sieve of 10-75 weight %, the clay of 0-60 weight %, the inorganic oxide of 15-60 weight % The phosphorus additive of thing binding agent, VIII race's metallic addition of 0.5-15 weight % and 2-25 weight %；The transition metal choosing From the one or more in Fe, Co, Ni, Cu, Mn, Zn, Sn and Bi；The beta-molecular sieve of the phosphorous and transition metal, with P₂O₅ Meter phosphorus content accounts for 1-10 weight %, and tenor accounts for 0.5-10 weight % in terms of metal oxide, the molecular sieve²⁷Al MAS In NMR, chemical shift be 40 ± 3ppm resonance signals peak area with chemical shift be 54ppm ± 3ppm resonance signals peak area it Than more than 1, the sum of resonance signal peak area that chemical shift is 0 ± 3ppm and chemical shift is -12ppm ± 3ppm accounts for Zong Feng faces Long-pending percentage is less than 10%.The cracking catalyst composition is applied to the catalytic cracking of petroleum hydrocarbon, can increase catalytic cracking liquid Change gas yield, improve low-carbon olefin concentration, especially isobutylene concentration in liquefied gas, while improve the ratio between ethene and dry gas, carry High octane number.

Chinese patent CN103785456A discloses a kind of cracking additive for improving low-carbon olefin concentration, contains modified β points Sub- sieve, the phosphorus aluminium inorganic binder containing the first clay, other inorganic binders and VIII race's metallic addition, it is viscous with or without second Soil；The phosphorus aluminium inorganic binder containing the first clay includes aluminium component, phosphorus component and with the first clay；The phosphorus and Transition metal modified beta-molecular sieve, with P₂O₅Meter phosphorus content accounts for 1-10 weight %, and tenor accounts for 0.5-10 in terms of metal oxide Weight %, the molecular sieve²⁷In Al MAS NMR, chemical shift is with chemical shift for 40 ± 3ppm resonance signals peak area The ratio between 54ppm ± 3ppm resonance signal peak areas be more than or equal to 1, chemical shift be 0 ± 3ppm and chemical shift be -12ppm ± The percentage that the sum of resonance signal peak area of 3ppm accounts for total peak area is less than or equal to 10%.The cracking catalyst composition application In the catalytic cracking of petroleum hydrocarbon, catalytic cracking liquefied gas yield can be increased, improve low-carbon olefin concentration in liquefied gas, it is especially different Butene concentration, while the ratio between ethene and dry gas are improved, octane number is improved, large scale does not influence major catalyst when blending auxiliary agent Heavy oil conversion performance.

Chinese patent CN103785457A discloses a kind of cracking additive for improving low-carbon olefin concentration, including 10-75 weights The beta-molecular sieve of phosphorous and transition metal, the clay of 0-60 weight %, the inorganic oxide binder of 15-60 weight % of % is measured, Wherein, with P in the described phosphorous and beta-molecular sieve of transition metal₂O₅Meter phosphorus content is 1-10 weight %, the gold in terms of metal oxide Category content is 0.5-10 weight %；It is described phosphorous and the beta-molecular sieve of transition metal²⁷In Al MAS NMR, chemical shift 40 ± 3ppm resonance signals peak area is more than 1 with chemical shift for the ratio between 54ppm ± 3ppm resonance signal peak areas, and chemical shift is The percentage that 0 ± 3ppm and chemical shift account for total peak area for the sum of resonance signal peak area of -12ppm ± 3ppm is less than 10%.The auxiliary agent, which is applied to catalytic cracking, can improve ethylene concentration in catalytic cracked dry gas, improve propylene, isobutene in liquefied gas Concentration.

Chinese patent CN103785458A discloses a kind of cracking additive for improving low-carbon olefin concentration, contains phosphorous and mistake Cross metal, phosphorus aluminium inorganic binder, other inorganic binders and the second clay containing the first clay；Wherein, it is described containing the The phosphorus aluminium inorganic binder of one clay is included with Al₂O₃Count 15~40 weight % aluminium components, with P₂O₅Count the phosphorus of 45~80 weight % First clay of component and in terms of butt 1~40 weight %, and its P/Al weight ratio is 1~6；The phosphorous and transition gold The beta-molecular sieve of category, with P₂O₅Meter phosphorus content accounts for 1~10 weight %, and tenor accounts for 0.5~10 heavy % in terms of metal oxide, should Molecular sieve²⁷In Al MAS NMR, chemical shift is 40 ± 3ppm resonance signals peak area and chemical shift is 54ppm ± 3ppm The ratio between resonance signal peak area is more than 1, the resonance signal peak that chemical shift is 0 ± 3ppm and chemical shift is -12ppm ± 3ppm The percentage that the sum of area accounts for total peak area is less than 10%.The auxiliary agent is applied to catalytic cracking, can improve in catalytic cracked dry gas Propylene, isobutylene concentration in ethylene concentration, liquefied gas.

Chinese patent CN103787357A discloses a kind of modified beta molecular sieve, with P₂O₅Meter phosphorus content accounts for 1-10 weight %, Tenor accounts for 0.5-10 weight % in terms of metal oxide, it is characterised in that the molecular sieve²⁷In Al MAS NMR, chemical potential It is that the ratio between 54ppm ± 3ppm resonance signal peak areas are more than or equal to 1 to move as 40 ± 3ppm resonance signals peak area and chemical shift, And the sum of resonance signal peak area that chemical shift is 0 ± 3ppm and chemical shift is -12ppm ± 3ppm accounts for the hundred of total peak area Fraction is less than or equal to 10%.The molecular sieve has excellent hydrothermal stability, applied to catalytic cracking or Deep Catalytic Cracking process It is middle as the active component of catalyst or auxiliary agent when with more excellent product selectivity.

Chinese patent CN103787358A discloses a kind of phosphorous and beta-molecular sieve of metal, it is characterised in that with P₂O₅Meter Phosphorus content accounts for 1-10 weight %, and tenor accounts for 0.5-10 weight % in terms of metal oxide, the molecular sieve²⁷Al MAS NMR In, chemical shift is 40 ± 3ppm resonance signals peak area and chemical shift is the ratio between 54ppm ± 3ppm resonance signal peak areas More than or equal to 1.

Chinese patent CN103787359A discloses a kind of phosphorous Silicon-rich beta-molecular sieve, it is characterised in that with P₂O₅Count phosphorus Content accounts for 1-10 weight %, the molecular sieve²⁷In Al MAS NMR, chemical shift is 40 ± 3ppm resonance signals peak area with changing Displacement study is more than or equal to 1 for the ratio between 54ppm ± 3ppm resonance signal peak areas, chemical shift be 0 ± 3ppm and chemical shift be- The percentage that the sum of resonance signal peak area of 12ppm ± 3ppm accounts for total peak area is less than or equal to 10%.The patent also provides The preparation method of above-mentioned phosphorous Silicon-rich beta-molecular sieve, is characterized in that beta-molecular sieve original powder by temperature-programmed calcination removing mould Aluminium is taken out after plate agent, then carries out P Modification again.

Since the pore passage structure of beta-molecular sieve uniqueness, peracidity and good hydrothermal stability, the prospect of its commercial Application are wide It is general, it has been applied successfully to the petrochemical industries such as the alkylation of isomerization, catalytic cracking and aromatic hydrocarbons.But due to selecting for molecular sieve Shape acts on so that when the aerodynamic size of reactant molecule has exceeded the aperture of micro porous molecular sieve, reactant molecule can not expand Dissipate and enter inside molecular sieve；Due to the presence of outer surface acidity so that reaction product occurs to react without selection in molecular sieve surface, Influence product distribution.Poromerics aperture is smaller, surface has more polyoxybiontic weakness in order to overcome, surface Silicon-rich and rich in being situated between The catalysis material in hole is increasingly subject to the attention of people.

Chinese patent CN1769169A discloses a kind of preparation method of the beta-molecular sieve with hierarchical porous structure, its is main Comprise the following steps：The direct crystal form ammonium salt of molecular sieve of low temperature nucleation, high temperature crystallization is handled, three sections of controls of crystal form after filtration drying The temperature roasting demoulding, after then carrying out acid treatment under the conditions of mitigation, then carries out pressurized thermal water, the silica alumina ratio of the beta-molecular sieve of gained 80~120, and there is the distribution in tri- kinds of apertures of 0.1~1.7nm, 1.7~6.0nm and 10~90.0nm, improve beta-molecular sieve Surface utilisation.

Chinese patent CN101003378 discloses a kind of preparation method of beta zeolite with multilevel pore canals, is impregnated with sucrose solution Monolithic silica column, dry, polymerization, charing, obtains charcoal silicon compound, by charcoal silicon compound with by silicon source, inorganic base, organic amine, After the mixed solution wetting of water composition, crystallization and recovery product.This method Carbon Materials in crystallization process are effectively protected silicon The pore passage structure of glue integral post, and be unlikely to be destroyed in crystallization process.There are micro- in β zeolitic materials prepared by this method The multistage pore canals such as meter level macropore, mesoporous and micropore, overcome limitation of the zeolite molecular sieve micropore to its catalytic performance, wherein penetrating The presence of type macropore can shorten the distance of reaction molecular diffusion, can reduce the pressure drop of device and then improve the processed in units of device Ability, can make the selectivity of product be easy to adjust and control, mesoporous to provide abundant inner ratio surface area, this urges macromolecular Change reaction to have very important significance.

Chinese patent CN101538049 discloses a kind of preparation method of beta zeolite with multilevel pore canals, belong to the preparation of zeolite with Applied technical field.It is characterized in that the charcoal particle for constraining lower generation using ordered mesoporous pore canals adds small as hard template The mesoporous Si-Al converted in-situ of parcel charcoal particle is micropore β zeolites by molecule organic ammonium soft template, after roasting removes soft or hard template It can must contain the β zeolites of multistage pore canal.The beta zeolite with multilevel pore canals for the method synthesis that the patent provides using mesoporous carbon with directly making mould Plate is compared, and without first removing mesoporous Si-Al, is then introduced back into the sial species of synthetic zeolite, has both reduced the process of complexity, A kind of preparation method of beta zeolite with multilevel pore canals of raw material is saved again.Diffusional resistance can be substantially reduced, reduces secondary response, tool There is more preferable catalytic performance, have huge potential using value in the field such as petrochemical industry and field of fine chemical.

Chinese patent CN102050463A discloses the beta-molecular sieve and its silication preparation method of a kind of containing mesopore, therein Preparation method includes：H beta-molecular sieves after roasting carry out dealuminzation in acid solution；By the sample of dealuminzation and template-silicon source solution Mixing, carries out crystallization；It is filtered, it is dry, obtain product after roasting.

Chinese patent CN102826564A discloses a kind of preparation method of the beta-molecular sieve of hierarchical porous structure, it is with positive silicon Acetoacetic ester is silicon source, using sodium metaaluminate as silicon source, using six ammonium cation type quaternary surfactants as template, in alkali Property under the conditions of prepared by hydrothermal synthesis method and contain the mesoporous and multistage porous molecular sieve of β micropores.

Chinese patent CN102826565A discloses a kind of preparation method of multistage pore canal beta-molecular sieve, without the second template In the case of agent, by " plan solid phase " alumino-silicate one-step synthesis multi-stage pore channel beta molecular screen, it includes " cellular " structure Or particle size is 5-60 microns of bulky grains, " cellular " structure or bulky grain are polymerized by nano-class molecular sieve little crystal grain, The size of nano-class molecular sieve little crystal grain is 10-100 nanometers, and the mesoporous pore size being polymerized by nano-class molecular sieve little crystal grain is 3-45 nanometers, micropore size is 0.6-0.8 nanometers.

Chinese patent CN103318911A discloses a kind of preparation method of beta zeolite with multilevel pore canals：By silicon source, tetraethyl hydrogen Ammonium hydroxide solution, sodium hydroxide and the silicon source that is completely dissolved after mixing constant temperature stirring at a certain temperature until being formed dry solidifying Glue；120 1 180 DEG C of progress first time hydro-thermals of gained xerogel, suitable silane coupling agent is added after cooling, grinding；120 1 180 ° of DEG C of progress, second of hydro-thermal, can obtain the β zeolites of multistage pore canal after cooling, filtering, roasting；Preparation method and post processing Method is simple, and yield is high, industry's enlarging production easy to implement.

Chinese patent CN103964458A discloses a kind of beta-molecular sieve of high silica alumina ratio multistage pore canal and preparation method thereof. There is pore-size distribution in the duct of the molecular sieve in below 2nm, 5~11nm and more than 50nm, and wherein micro pore volume is in 0.19cm³/g More than, mesoporous and macropore cumulative volume is 0.35cm³/ more than g, its silica alumina ratio are more than 90, specific surface area 400m²/ more than g.Should Preparation method comprises the following steps：Raw material β zeolites are subjected to first time acid treatment；β zeolites after first time acid treatment are carried out Roast for the first time；β zeolites carry out second of acid treatment after first time is roasted, and obtain the β of the high silica alumina ratio multistage pore canal Zeolite.

Chinese patent CN104261423A discloses a kind of preparation method of monocrystalline multi-stage porous beta-molecular sieve.First by nothing Machine alkali source, silicon source are added in the aqueous solution of micropore template agent (TEA+), then add suitable n-methyl-2-pyrrolidone (NMP) stirred evenly with silicon source, pass through simple hydro-thermal method synthetic single crystal multi-stage porous Beta molecular sieves.

Chinese patent CN104321280A discloses a kind of zeolite beta and its manufacture method.It is characterized in that：(i)SiO₂/ Al₂O₃Than for 8~30, and SiO₂/ ZnO ratios are 8~1000；(ii) micro pore surface area is 300m²/ g~800m²/g；(iii) micropore Volume is 0.1cm³/ g~0.3cm³/g；(iv) there is a diameter of 2nm~6nm, its volume in the state of keeping intact in post synthesis For 0.001cm³/ g~0.3cm³/ g's is mesoporous.The zeolite beta can be manufactured suitably in the following manner：By zinc silicate salt β Type zeolite is added in the reaction mixture containing silica source, alumina source, alkali source and water as crystal seed, and carries out anti- Should.

Chinese patent CN104353484A discloses a kind of preparation method of cheap highly acid multi-stage porous Beta zeolites.Method Including：First, by Beta zeolite calcinations, micropore Hydrogen Beta zeolites are obtained；2nd, micropore Hydrogen Beta zeolites are added to aqueous slkali Middle stirring, is washed, dry, obtains sodium form desiliconization multi-stage porous Beta zeolites；3rd, sodium form desiliconization multi-stage porous Beta zeolites are added to Aqueous ammonium nitrate solution exchanges, and Hydrogen desiliconization multi-stage porous Beta zeolites are obtained after calcining；4th, by Hydrogen desiliconization multi-stage porous Beta zeolites It is added in acid solution and stirs, wash, dry, then repeat step three, that is, obtains highly acid multi-stage porous Beta zeolites.

Chinese patent CN104402020A discloses a kind of middle micro-diplopore beta-molecular sieve and its preparation method and application.The party Method is using sodium metaaluminate as optimal silicon source, using ethyl orthosilicate as optimal silicon source, with eight Bola type quaternary ammoniums of different carbon chain lengths Salt surfactant is template, and being prepared in alkaline condition with hydro-thermal method at the same time there is the mesoporous and β multi-stage porous of microcellular structure to boil Stone molecular sieve.

Chinese patent CN104418345A, CN104418346A, CN104418347A, CN104418348A, CN104418349A, CN104418350A, CN104418351A, CN104418352A, CN104418353A disclose one group of tool There is multi-stage artery structure beta-molecular sieve and preparation method thereof, use such as polyquaternium -6, polyquaternium -7, gather in the synthesis process Quaternary ammonium salt -10, polyquaternium -11, Merquat 280, polyquaternium -32, polyquaternium -37, polyquaternium -39, polyquaternary amine The grade high molecular polymer of salt -44 has 8~20nm at the same time as micropore and mesoporous directed agents, synthesized beta-molecular sieve at the same time Mesoporous and 50~200nm macropore.

Chinese patent CN105692644A discloses a kind of method for preparing porous zeotile, i.e., using various alkali steam as boiling The mineralizer of petrochemical industry, using amorphous mesopore/macropore material as presoma, multi-stage porous is prepared by the method for alkali steam heating Zeolitic material.The amorphous mesopore/macropore material that the patent is applicable in is related to various mesoporous or large pore molecular sieve nothing for presoma Shape porous, inorganic presoma, and applicable porous zeotile is related to the boiling of MFI zeolites, β zeolites, Y zeolites, silicatite-1 Stone.This is the first case that the hot method of vapour of an alkali metal prepares porous zeotile, with the prior art with equal or higher HF and more Wide zeolite prepares applicability.

All exist in the above-mentioned method for preparing multi-stage porous β using organic ammonium salt sewage is not disposable, preparation flow is longer, divides The problems such as sub- sieve pore structure is destroyed, is distributed without modulation surfaces of aluminum.

The content of the invention

The object of the present invention is to provide a kind of assistant for calalytic cracking containing rich in mesoporous Beta molecular sieves and its preparation The auxiliary agent of the present invention, can be improved the yield of isobutene and propylene by method applied to catalytic cracking, improve octane number.

To achieve these goals, present invention offer is a kind of helps containing the catalytic cracking rich in mesoporous Beta molecular sieves Agent, by weight and on the basis of the butt weight of the auxiliary agent, the auxiliary agent contains the richness of the 10-75 weight % in terms of butt The Beta molecular sieves of containing mesopore, the clay of 0-60 weight % in terms of butt, the inorganic oxide of 15-60 weight % in terms of butt Thing binding agent, with P₂O₅The VIII race metal addition of the phosphorus additive of the 0-25 weight % of meter and the 0-15 weight % in terms of oxide Agent, wherein, the Al distributed constants D of the molecular sieve meets：0.4≤D≤0.8, wherein, D=Al (S)/Al (C), Al (S) are represented The inside H in crystal face edge using the zeolite crystal of TEM-EDS methods measure is arbitrarily more than 100 square nanometers regions apart from interior Aluminium content, Al (C) are represented in the outside H distances of geometric center using crystal face described in the zeolite crystal of TEM-EDS methods measure Any aluminium content for being more than 100 square nanometers regions, wherein the H arrives the crystal face geometrical center to center for the crystal face edge point From 10%；The micropore specific area of the molecular sieve is 350-500 meters²/ gram, the mesopore volume of the molecular sieve accounts for total hole body Long-pending ratio is 30-70 bodies %.

Preferably, the Al distributed constants D of the molecular sieve meets：0.55≤D≤0.75；The micropore of the molecular sieve compares table Area is 370-450 meters²/ gram, the ratio that the mesopore volume of the molecular sieve accounts for total pore volume is 35-60 bodies %.

Preferably, by weight and on the basis of the butt weight of the auxiliary agent, the auxiliary agent contains the 20- in terms of butt The clay of the 10-45 weight % rich in mesoporous Beta molecular sieves, in terms of butt of 60 weight %, the 25-50 weights in terms of butt Measure the inorganic oxide binder of %, with P₂O₅The phosphorus additive of the 5-15 weight % of meter and the 1-10 weight % in terms of oxide VIII race's metallic addition.

Preferably, the clay include selected from kaolin, metakaolin, sepiolite, attapulgite, montmorillonite, tired de- stone, At least one of diatomite, galapectite, saponite, bentonite and hydrotalcite, the inorganic oxide binder are included selected from plan At least one of boehmite, Aluminum sol, silicon-aluminum sol and waterglass.

Preferably, the phosphorus additive introduces the auxiliary agent in the form of phosphorus-containing compound, and the phosphorus-containing compound includes At least one of oxide, phosphate, phosphite, subphosphate and acid phosphate selected from phosphorus；The VIII race gold Belonging to is included selected from least one of Fe, Co and Ni, and VIII race metallic addition introduces institute in the form of metal-containing compound State auxiliary agent, the metal-containing compound include selected from oxide, hydroxide, chloride, nitrate, sulfate, phosphate and At least one of organic compound.

The present invention also provides a kind of preparation method of assistant for calalytic cracking, which includes：It will be enriched in mesoporous Beta molecular sieves, inorganic oxide binder and water mixing, add or are added without clay, be beaten, spray drying；Wherein, introduce Or phosphorus additive is not introduced, introduce or do not introduce VIII race's metallic addition；By weight and with the preparing raw material of the auxiliary agent On the basis of butt weight, the preparing raw material of the auxiliary agent contains dividing rich in mesoporous Beta for the 10-75 weight % in terms of butt Son sieve, the clay of 0-60 weight % in terms of butt, the inorganic oxide binder of 15-60 weight % in terms of butt, with P₂O₅ VIII race's metallic addition of the phosphorus additive of the 0-25 weight % of meter and the 0-15 weight % in terms of oxide；The molecular sieve Al distributed constants D meets：0.4≤D≤0.8, wherein, D=Al (S)/Al (C), Al (S) represent to measure using TEM-EDS methods The inside H in crystal face edge of zeolite crystal represent to adopt apart from interior any aluminium content for being more than 100 square nanometers regions, Al (C) The outside H of geometric center of crystal face is arbitrarily more than 100 square nanometers apart from interior described in the zeolite crystal measured with TEM-EDS methods The aluminium content in region, wherein the H, which is the crystal face edge point, arrives the 10% of the crystal face geometric center distance；The molecular sieve Micropore specific area be 350-500 meters²/ gram, the ratio that the mesopore volume of the molecular sieve accounts for total pore volume is 30-70 Body %.

Preferably, the preparation process rich in mesoporous Beta molecular sieves includes：A, by sodium form Beta molecular sieves in alkali Alkali process is carried out in property solution, and after being filtered and being washed, obtains alkali process molecular sieve；B, by gained alkali process in step a Molecular sieve carries out dealumination treatment in the Compound-acid dealuminzation agent solution being made of fluosilicic acid, organic acid and inorganic acid, and carries out After filter and washing, obtain described being rich in mesoporous Beta molecular sieves.

Preferably, the alkaline solution is selected from sodium hydroxide solution, potassium hydroxide solution, lithium hydroxide solution, ammonium hydroxide At least one of with high alkali deflection aluminium acid sodium solution；In terms of oxide, the sodium content of the high alkali deflection aluminium acid sodium solution is 270- 310 g/l, aluminium content is 30-50 g/l, and the density of high alkali deflection aluminium acid sodium solution is 1.25-1.45 grams per milliliters.

Preferably, the condition of alkali process includes described in step a：With in the molecular sieve and alkaline solution of dry basis The weight ratio of alkali is 1：(0.02-0.3)；Wherein, the weight of the alkali in the sodium hydroxide solution is with the weight of sodium hydroxide Count, the weight of the alkali in the potassium hydroxide solution is in terms of the weight of potassium hydroxide, the weight of the alkali in the lithium hydroxide solution Amount is in terms of the weight of lithium hydroxide, and the weight of the alkali in the ammonium hydroxide is in terms of the weight of a hydration ammonia, the high alkali deflection aluminium acid sodium The weight of alkali in solution is in terms of the weight of sodium oxide molybdena.

Preferably, the condition of alkali process includes described in step a：The temperature of alkali process be 25-100 DEG C, alkali process when Between for 0.5-6 it is small when.

Preferably, organic acid described in step b is in ethylenediamine tetra-acetic acid, oxalic acid, citric acid and sulfosalicylic acid At least one, the inorganic acid be selected from least one of hydrochloric acid, sulfuric acid and nitric acid.

Preferably, the condition of dealumination treatment includes described in step b：With the molecular sieve of dry basis, fluosilicic acid, organic The weight ratio of acid and inorganic acid is 1：(0.03-0.5):(0.05-0.4):(0.05-0.5)；Treatment temperature is 25-100 DEG C, When processing time is 0.5-6 small.

Preferably, the condition of dealumination treatment includes described in step b：With the molecular sieve of dry basis, fluosilicic acid, organic The weight ratio of acid and inorganic acid is 1：(0.05-0.3):(0.1-0.3):(0.1-0.3).

Cracking additive provided by the present invention, uses rich in mesoporous beta-molecular sieve as active component, may be incorporated into appropriate Phosphorus additive and VIII race's metallic addition, improve the yield and selectivity of isobutene, propylene and ethene, improve catalysis and split Change the octane number of gasoline, and the liquid for increasing catalytic cracking reaction is received.

Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.

Embodiment

The embodiment of the present invention is described in detail below.It is it should be appreciated that described herein specific Embodiment is merely to illustrate and explain the present invention, and is not intended to limit the invention.

Present invention offer is a kind of containing the assistant for calalytic cracking rich in mesoporous Beta molecular sieves, by weight and with described On the basis of the butt weight of auxiliary agent, the auxiliary agent contain the 10-75 weight % in terms of butt rich in mesoporous Beta molecular sieves, The clay of 0-60 weight % in terms of butt, the inorganic oxide binder of the 15-60 weight % in terms of butt, with P₂O₅Meter VIII race's metallic addition of the phosphorus additive of 0-25 weight % and the 0-15 weight % in terms of oxide, preferably comprises in terms of butt 20-60 weight % clay, the 25- in terms of butt rich in mesoporous Beta molecular sieves, 10-45 weight % in terms of butt The inorganic oxide binder of 50 weight %, with P₂O₅The phosphorus additive of the 5-15 weight % of meter and the 1-10 weights in terms of oxide Measure VIII race's metallic addition of %；Wherein, the Al distributed constants D of the molecular sieve meets：0.4≤D≤0.8, wherein, D=Al (S)/Al (C), Al (S) represent the inside H in crystal face edge using the zeolite crystal of TEM-EDS methods measure apart from interior arbitrarily large Aluminium content in 100 square nanometers regions, Al (C) are represented using crystal face described in the zeolite crystal of TEM-EDS methods measure The outside H of geometric center is apart from interior any aluminium content for being more than 100 square nanometers regions, wherein the H is the crystal face edge Point arrives the 10% of the crystal face geometric center distance；The micropore specific area of the molecular sieve is 350-500 meters²/ gram, the molecule The ratio that the mesopore volume of sieve accounts for total pore volume is 30-70 bodies %.Preferably, the Al distributed constants D of the molecular sieve meets： 0.55≤D≤0.75；The micropore specific area of the molecular sieve is 370-450 meters²/ gram, the mesopore volume of the molecular sieve accounts for The ratio of total pore volume is 35-60 bodies %.

According to the present invention, using TEM-EDS methods measure molecular sieve aluminium content be it is well-known to those skilled in the art, Wherein described geometric center is also well-known to those skilled in the art, can be calculated according to formula, and the present invention is no longer superfluous State, the geometric center of generally symmetrical figure is the intersection point of each opposed apexes line, for example, normal cubic shape Beta molecular sieves are just Point of intersection of the geometric center of square crystal face in opposed apexes line.The crystal face is a face of regular crystal grain, it is described to Interior and outwardly direction refers both to the direction inwardly or outwardly on the crystal face.

According to the present invention, clay and inorganic oxide binder are well-known to those skilled in the art, for example, described glue Soil can be included selected from kaolin, metakaolin, sepiolite, attapulgite, montmorillonite, tired de- stone, diatomite, galapectite, soap At least one of stone, bentonite and hydrotalcite, preferably include selected from kaolin, metakaolin, diatomite, sepiolite, bumps At least one of rod stone, montmorillonite and tired de- stone；The inorganic oxide binder can be included selected from boehmite, aluminium At least one of colloidal sol, silicon-aluminum sol and waterglass, preferably include boehmite and/or Aluminum sol.

According to the present invention, the phosphorus additive can introduce the auxiliary agent in the form of phosphorus-containing compound, described to contain phosphatization Compound includes the one or more in the inorganic compound and organic compound of phosphorus, can be soluble easily in water or difficult Water or phosphorus compound not soluble in water are dissolved in, is selected from oxide, phosphate, phosphite, subphosphate and the acid of phosphorus At least one of acid phosphate；Preferable phosphorus compound is phosphoric acid, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, aluminum phosphate With the one or more in phosphorus Aluminum sol.The phosphorus additive can reside in any position that may be present of auxiliary agent, such as can be with It is present in inside the duct of zeolite, the surface of zeolite, can reside in host material, the hole of zeolite can also be present at the same time Inside road, in the surface and host material of zeolite.The phosphorus additive is with phosphorus compound (oxide of such as phosphorus, phosphate, phosphorous Hydrochlorate, subphosphate, acid phosphate) form exist.

According to the present invention, VIII race metal can include more preferably including Fe selected from least one of Fe, Co and Ni, VIII race metallic addition can introduce the auxiliary agent in the form of metal-containing compound, and the metal-containing compound can wrap Include selected from least one of oxide, phosphate, phosphite, subphosphate and acid phosphate.The metal addition Agent can reside in any position that may be present of auxiliary agent, such as can reside in inside the duct of zeolite, the surface of zeolite, can be with It is present in host material, can also be present at the same time inside the duct of zeolite, in the surface and host material of zeolite, preferably deposit In host material.Existence form of VIII race metallic addition in auxiliary agent can be any possible form, such as Can be the metal oxide, phosphate, phosphite, subphosphate or acid phosphate in one or more.

According to the present invention, the micropore specific area of the molecular sieve and mesopore volume account for the ratio of total pore volume using nitrogen suction Attached BET specific surface area method measures, and the mesopore volume finger-hole footpath is more than 2 nanometers of pore volumes for being less than 100 nanometers.

According to the present invention, the preparation process rich in mesoporous Beta molecular sieves can include：A, sodium form Beta is divided Son sieve carries out alkali process in alkaline solution, and after being filtered and being washed, obtains alkali process molecular sieve；B, by institute in step a Obtain alkali process molecular sieve and carry out dealumination treatment in the Compound-acid dealuminzation agent solution being made of fluosilicic acid, organic acid and inorganic acid, And after being filtered and being washed, obtain described being rich in mesoporous Beta molecular sieves.

According to the present invention, the sodium form Beta molecular sieves are well-known to those skilled in the art, specifically may refer to U.S. State patent USP3,308,069 and Chinese patent CN 00107486.5, can be without amine crystallization gained, can also be by template legal system Obtained by after standby molecular sieve roasting, sodium content can be 4-6 weights % in terms of sodium oxide molybdena in sodium form Beta molecular sieves.

According to the present invention, alkali process is used for the part framework silicon atom for removing molecular sieve, produces more second holes, the alkali Property solution can be selected from sodium hydroxide solution, potassium hydroxide solution, lithium hydroxide solution, ammonium hydroxide and high alkali deflection aluminium acid sodium solution At least one of, it is preferably high alkali deflection aluminium acid sodium solution；In terms of oxide, the sodium content of the high alkali deflection aluminium acid sodium solution can Think 270-310 g/l, aluminium content can be 30-50 g/l, and the density of high alkali deflection aluminium acid sodium solution can be 1.25-1.45 Grams per milliliter；The condition of alkali process can include described in step a：With the alkali in the molecular sieve and alkaline solution of dry basis Weight ratio can be 1：(0.02-0.3), is preferably 1：(0.03-0.25)；Wherein, the alkali in the sodium hydroxide solution Weight in terms of the weight of sodium hydroxide, the weight of the alkali in the potassium hydroxide solution is described in terms of the weight of potassium hydroxide The weight of alkali in lithium hydroxide solution is in terms of the weight of lithium hydroxide, and the weight of the alkali in ammonium hydroxide is with the weight of a hydration ammonia Count, the weight of the alkali in high alkali deflection aluminium acid sodium solution is in terms of the weight of sodium oxide molybdena；The temperature of alkali process can be 25-100 DEG C, alkali When the time of processing can be 0.5-6 small.

According to the present invention, dealumination treatment is well-known to those skilled in the art, but is not reported inorganic acid, organic acid It is used for dealumination treatment together with fluosilicic acid.The dealumination treatment can carry out once or several times, can be first by organic acid and institute The mixing of alkali process molecular sieve is stated, then mixes fluosilicic acid and inorganic acid with the alkali process molecular sieve, you can with will first to have Machine acid is added in alkali process molecular sieve, and then by fluosilicic acid and inorganic acid, cocurrent adds at a slow speed, or is first added fluosilicic acid and added Inorganic acid, is preferably that cocurrent adds at a slow speed for fluosilicic acid and inorganic acid.Organic acid described in step b can be selected from ethylenediamine tetrem At least one of acid, oxalic acid, citric acid and sulfosalicylic acid, are preferably oxalic acid or citric acid, more preferably oxalic acid；Nothing Machine acid can be selected from least one of hydrochloric acid, sulfuric acid and nitric acid, be preferably hydrochloric acid or sulfuric acid, more preferably hydrochloric acid； The condition of dealumination treatment can include described in step b：With the molecular sieve of dry basis, fluosilicic acid, organic acid and inorganic acid Weight ratio can be 1：(0.03-0.5):(0.05-0.4):(0.05-0.5), is preferably 1：(0.05-0.3):(0.1- 0.3):(0.1-0.3)；Treatment temperature can be 25-100 DEG C, when processing time can be 0.5-6 small.

Washing of the present invention is well-known to those skilled in the art, refers generally to wash, it is for instance possible to use 5-10 times 30-60 DEG C of water of molecular sieve elutes molecular sieve.

Assistant for calalytic cracking preparation method provided by the present invention, when containing phosphorus additive in auxiliary agent, the phosphorus adds Add agent that the combination of one of following method or several method can be used to introduce, but be not limited to these methods and introduce auxiliary agent In：

1st, phosphorus compound is added in slurries in going to for auxiliary agent spray drying forming；

2nd, after auxiliary agent spray drying forming through dipping or chemisorbed phosphorus compound, through separation of solid and liquid (if desired If), dry and roasting process introduce, the temperature of the drying can be room temperature to 400 DEG C, preferably 100-300 DEG C, roasting Temperature can be 400-700 DEG C, be preferably 450-650 DEG C, be preferably 0.5-10 small when roasting time can be 0.5-100 small When.The phosphorus compound can be selected from the one or more in the various inorganic compounds and organic compound of phosphorus.The phosphatization Compound can be soluble easily in water or be insoluble in water or phosphorus compound not soluble in water.The embodiment bag of phosphorus compound Include the oxide of phosphorus, phosphoric acid, orthophosphates, phosphite, hypophosphites, phosphorous organic compound etc..Preferable phosphatization is closed Thing selected from phosphoric acid, ammonium phosphate, ammonium dihydrogen phosphate, diammonium hydrogen phosphate, aluminum phosphate and in one or more.

Thus, the phosphorus additive can reside in any position that may be present of auxiliary agent, as can reside in zeolite Inside duct, the surface of zeolite, can reside in host material, can also be present at the same time inside the duct of zeolite, zeolite Surface and host material in.The phosphorus additive is with phosphorus compound (oxide of such as phosphorus, orthophosphates, phosphite, alkali formula Phosphate, acid phosphate) form exist.

According to the present invention, the metallic addition, metallic addition can be introduced by introducing the form of metallic compound It can be introduced in any step before the spray drying forming of auxiliary agent preparation process toward addition metallic compound in slurries； It can be introduced by being roasted after dipping or chemisorbed metallic compound after the auxiliary agent spray drying forming, this method includes Auxiliary agent is impregnated with metal-containing compound aqueous solution or chemisorbed is handled, then carries out separation of solid and liquid (if desired Words), dry and roasting, wherein dry temperature is room temperature to 400 DEG C, preferably 100-300 DEG C, the temperature of roasting is 400-700 DEG C, it is preferably 450-650 DEG C, when roasting time is 0.5-100 small, when being preferably 0.5-10 small.The metallic compound choosing One or more from their inorganic compound and organic compound can be soluble easily in water or be insoluble in Water or compound not soluble in water.The oxide of the example of metallic compound including metallic compound, hydroxide, chloride, Nitrate, sulfate, phosphate, the organic compound etc. of metal.Preferable metallic compound is selected from their chloride, nitric acid One or more in salt, sulfate and phosphate.

Assistant for calalytic cracking provided by the invention is suitable for various hydrocarbon oil catalytic crackings., can during for catalytic cracking process Individually toward adding in catalyst cracker, used after can also being mixed with catalytic cracking catalyst.Under normal circumstances, the present invention carries The auxiliary agent of confession accounts for FCC catalyst and is no more than 30 weight % with agent mixture total amount provided by the invention, is preferably 1-25 weights %, more preferably 3-15 weight % are measured, the hydrocarbon ils be selected from various petroleum distillates, such as crude oil, reduced crude, decompression residuum, normal Press wax oil, decompressed wax oil, straight-run gas oil, propane it is light/one or more in de-oiling, wax tailings and coal liquefaction products again.Institute Beavy metal impurity and sulphur, the nitrogen impurities such as nickel, vanadium can be contained by stating hydrocarbon ils, as the content of sulphur may be up to 3.0 weight %, the content of nitrogen The content of the metal impurities such as up to 2.0 weight %, vanadium, nickel may be up to 3000ppm.

Assistant for calalytic cracking provided by the invention is used in catalytic cracking process, and hydrocarbon oil catalytic cracking condition can be conventional Catalytic cracking condition.In general, it is 400-600 DEG C which, which includes reaction temperature, is preferably 450- 550 DEG C, when weight (hourly) space velocity (WHSV) is 8-120 small^-1, when being preferably 8-80 small^-1, oil ratio (weight ratio) is 1-20, is preferably 3-15. Assistant for calalytic cracking provided by the invention can be used for existing various catalyst crackers, such as in fixed bed reactors, fluidisation Carried out in bed reactor, riser reactor, multi-reaction-area reactor etc..

The present invention will be further illustrated by embodiment below, but the present invention is not therefore subject to any restriction, Instrument and reagent used by the embodiment of the present invention, unless otherwise instructed, be those skilled in the art's common instrument of institute and Reagent.

Part material property used in the embodiment of the present invention and comparative example is as follows：Boehmite is public for Shandong Aluminum Co., Ltd. Department's production industrial products, 61 weight % of solid content；Aluminum sol is the industrial products of sinopec catalyst asphalt in Shenli Refinery production, Al₂O₃Content is 21.5 weight %；The industrial products that waterglass produces for sinopec catalyst asphalt in Shenli Refinery, SiO₂Content 28.9 weight %, Na₂8.9 weight % of O content；Kaolin is the special kaolinite of Cracking catalyst of Kaolin of Suzhou company production Soil, 78 weight % of solid content.

The TEM-EDS assay methods of the present invention are referring to the research method of solid catalyst, petrochemical industry, 29 (3), and 2000： 227。

Micropore specific area, mesoporous pore volume, the assay method of total pore volume of the present invention is as follows：

The AS-3 produced using Quantachrome instrument companies, AS-6 static state n2 absorption apparatus measure.

Instrument parameter：Sample is placed in sample processing system, 1.33 × 10 are evacuated at 300 DEG C^-2Pa, heat-insulation pressure keeping 4h, purifies sample.At -196 DEG C of liquid nitrogen temperature, test purification sample is not pressing P/P on year-on-year basis₀Under the conditions of to the adsorbance of nitrogen And desorption rate, obtain N₂Adsorption-desorption isothermal curve.Then total specific surface area is calculated using two parameter BET formula, micropore compares table Area and mesopore surface area, take than pressing P/P₀Less than=0.98 adsorbance is the total pore volume of sample, utilizes BJH formula meters The pore-size distribution of mesoporous part is calculated, and mesoporous pore volume (2-100 nanometers) and 2-20 nanometers of mesoporous hole are calculated using integration method Volume.

The computational methods of D values are as follows：A crystal grain is chosen in transmission electron microscope and some crystal face of the crystal grain is formed One polygon, there are 10% distance H of geometric center, edge and geometric center to edge point is (different for the polygon Edge point, H values are different), choose respectively any one piece in the inside H distances in the crystal face edge be more than 100 square nanometers regions with And any one piece in the outside H distances of crystal face geometric center is more than 100 square nanometers regions, measures aluminium content, is Al (S1) With Al (C1), and D1=Al (S1)/Al (C1) is calculated, choose different crystal grain respectively and measure 5 times, it is D to calculate average value.

Embodiment 1-6 prepares molecular sieve provided by the invention；Comparative example 1-8 prepares contrast molecular sieve.

Embodiment 1

By 100gBeta molecular sieves, (catalyst asphalt in Shenli Refinery produces, SiO₂/Al₂O₃=25, sodium oxide content 4.5 Weight %, similarly hereinafter；Butt quality) plus water be beaten solid content for 10 weight % molecular sieve pulps, add 11.4g high alkali deflection aluminium acid sodiums Solution (Na₂O is 290g/L, Al₂O₃For 40g/L, solution density 1.353g/mL), it is warming up to 50 DEG C of constant temperature stirring 0.5h, mistake Filter washing is to neutrality；By filter cake plus water be beaten solid content for 20 weight % molecular sieve pulps, in stirring add 5.3g oxalic acid, so 51g hydrochloric acid (mass fraction 10%) and 17g fluosilicic acid (concentration 20%) is slowly added dropwise at the same time afterwards, is warming up to 50 DEG C of constant temperature stirrings 1h, filtration washing are dried to obtain sieve sample A, and the physico-chemical property of sieve sample A is listed in table 1.

Comparative example 1

By 100gBeta molecular sieves (butt quality) plus water be beaten solid content is the molecular sieve pulps of 10 weight %, add 22.4g high alkali deflection aluminium acid sodium solution (Na₂O is 290g/L, Al₂O₃For 40g/L, solution density 1.353g/mL), it is warming up to 50 DEG C constant temperature stirring 0.5h, filtration washing to neutrality；By filter cake plus water be beaten solid content for 20 weight % molecular sieve pulps, slowly 240g fluosilicic acid (concentration 20%) is added dropwise, is warming up to 50 DEG C of constant temperature stirring 1h, filtration washing is dried to obtain sieve sample DB1, The physico-chemical property of sieve sample DB1 is listed in table 1.

Comparative example 2

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, add 25g High alkali deflection aluminium acid sodium solution (Na₂O is 280g/L, Al₂O₃For 40g/L, solution density 1.25g/mL), it is warming up to 50 DEG C of constant temperature 0.5h is stirred, filtration washing to neutrality is dried to obtain sieve sample DB2, and the physico-chemical property of sieve sample DB2 is listed in table 1.

Comparative example 3

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added in stirring Enter 5.3g oxalic acid, 51g hydrochloric acid (mass fraction 10%) and 17g fluosilicic acid (concentration 20%) is then slowly added dropwise, is warming up to 50 DEG C Constant temperature stirs 1h, and filtration washing is dried to obtain sieve sample DB3, and the physico-chemical property of sieve sample DB3 is listed in table 1.

Comparative example 4

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 16.42gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water, which are beaten, to be consolidated Content is the molecular sieve pulp of 20 weight %, and oxalic acid 12g is added in stirring, then adds 280g hydrochloric acid (mass fraction 10%), is risen Temperature to 50 DEG C of constant temperature stir 1h, and filtration washing is dried to obtain sieve sample DB4, and the physico-chemical property of sieve sample DB4 is listed in Table 1.

Comparative example 5

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 10.42gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water, which are beaten, to be consolidated Content is the molecular sieve pulp of 20 weight %, and oxalic acid 40g is added in stirring, is warming up to 50 DEG C of constant temperature stirring 1h, filtration washing drying Sieve sample DB5 is obtained, the physico-chemical property of sieve sample DB5 is listed in table 1.

Comparative example 6

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 10.42gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h；By filter cake plus water be beaten solid content is 20 weight % Molecular sieve pulp, adds 300g hydrochloric acid (mass fraction 10%) in stirring, be warming up to 50 DEG C of constant temperature stirring 1h, filtration washing drying Sieve sample DB6 is obtained, the physico-chemical property of sieve sample DB6 is listed in table 1.

Comparative example 7

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 10.42gLiOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h；By filter cake plus water be beaten solid content is 20 weight % Molecular sieve pulp, adds 30g oxalic acid, 100g fluosilicic acid (concentration 20%) is then slowly added dropwise, is warming up to 50 DEG C of constant temperature in stirring 1h is stirred, filtration washing is dried to obtain sieve sample DB7, and the physico-chemical property of sieve sample DB7 is listed in table 1.

Comparative example 8

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 10.42gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h；By filter cake plus water be beaten solid content is 20 weight % Molecular sieve pulp, adds 180g hydrochloric acid (mass fraction 10%), 100g fluosilicic acid (concentration 20%) is then slowly added dropwise in stirring, 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample DB8, and sieve sample DB8 physico-chemical properties are listed in Table 1.

Embodiment 2

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 16gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water are beaten to consolidate and contained Measure for 20 weight % molecular sieve pulps, in stirring add 16g oxalic acid, then at the same time 108g hydrochloric acid (mass fractions are slowly added dropwise 10%) with 26g fluosilicic acid (concentration 20%), 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample B, The physico-chemical property of sieve sample B is listed in table 2.

Embodiment 3

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 19gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water are beaten to consolidate and contained Measure for 20 weight % molecular sieve pulps, in stirring add 26g oxalic acid, then at the same time 250g sulfuric acid (mass fractions are slowly added dropwise 10%) with 95g fluosilicic acid (concentration 20%), 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample C, The physico-chemical property of sieve sample C is listed in table 2.

Embodiment 4

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 30gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water are beaten to consolidate and contained Measure for 20 weight % molecular sieve pulps, in stirring add 33g oxalic acid, then at the same time 240g hydrochloric acid (mass fractions are slowly added dropwise 10%) with 95g fluosilicic acid (concentration 20%), 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample D, The physico-chemical property of sieve sample D is listed in table 2.

Embodiment 5

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 22gNaOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water are beaten to consolidate and contained Measure for 20 weight % molecular sieve pulps, in stirring add 5g citric acids, then at the same time 250g hydrochloric acid (mass fractions are slowly added dropwise 10%) with 130g fluosilicic acid (concentration 20%), 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample E, The physico-chemical property of sieve sample E is listed in table 2.

Embodiment 6

100gBeta molecular sieves (butt quality) plus water are configured to the molecular sieve pulp of the weight of solid content 10 %, added 25gKOH (purity 96%), is warming up to 50 DEG C of constant temperature stirring 0.5h, filtration washing to neutrality；Filter cake plus water are beaten to obtain solid content For the molecular sieve pulp of 20 weight %, 35g oxalic acid is added in stirring, 190g nitric acid (mass fraction 10%) then is slowly added dropwise at the same time With 90g fluosilicic acid (concentration 20%), 50 DEG C of constant temperature stirring 1h are warming up to, filtration washing is dried to obtain sieve sample F, molecular sieve The physico-chemical property of sample F is listed in table 2.

Conventional alkali process (DB2) will make Beta molecular sieve surface richness aluminium it can be seen from data in table 1, and use is single Organic acid oxalic acid dealuminzation (DB5) uses single inorganic acid HCl dealumination (DB6) and uses organic acid oxalic acid and inorganic acid salt Sour two kinds of acid compound (DB4) effectively can not all remove the Al in molecular sieve, molecular sieve still surface richness aluminium and only use Preferable dealuminzation effect could be obtained after fluosilicic acid, improves the distribution of molecular sieve aluminium.When fluosilicic acid dealuminzation is used alone (DB1), The aluminium distribution of molecular sieve can be improved, but it is mesoporous relatively fewer.Fluosilicic acid composite organic acid oxalic acid dealuminzation (DB7), same nothing Method obtains higher mesoporous ratio.Fluosilicic acid composite inorganic acid HCl dealumination (DB8), although mesopore volume increased, Ethyl cyclohexane conversion ratio and olefin yields are all be not as high as molecular sieve provided by the invention.Handled only with Compound-acid (DB3), mesoporous pore volume can not be increased, after the present invention to molecular sieve using first desiliconization processing is carried out, reuse compound acid system, Dealumination treatment is carried out under three kinds of sour synergistic effects, can ensure crystal structure of molecular sieve and mesopore orbit structural intergrity On the premise of improve aluminium distribution and acid distribution.

Embodiment 7-15 prepares cracking additive provided by the invention；Comparative example 9-17 prepares contrast auxiliary agent.

Embodiment 7

It is prepared by phosphorus aluminium glue：1.05 kilograms of boehmites (butt) and 3.35 kilograms of decationizing water are beaten 30 minutes, Toward 4.9 kilograms of concentrated phosphoric acids (pure, the 85 weight % of phosphoric acid of chemistry) of addition in slurries under stirring, 70 DEG C are warming up to, it is then warm herein The lower reaction of degree 45 minutes, is made the phosphorus aluminium glue (phosphorus Aluminum sol) of water white transparency.Wherein contain P₂O₅Content is 30.6 weight %, Al₂O₃ Content is 10.5 weight %, pH=1.7.

Molecular sieve-4 A and boehmite, kaolin are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, stirring Lower addition FeCl₃·6H₂Aqueous solution (the FeCl of O₃30 weight % of concentration, FeCl used in following embodiments₃·6H₂The aqueous solution of O Concentration is without specified otherwise, FeCl₃Concentration is 30 weight %), it is 34 weight % to control colloid solid content, is adjusted by hydrochloric acid The pH value 3.0 of slurries, is then beaten 45 minutes, adds phosphorus aluminium glue, stirs 30 minutes, is then spray-dried obtained slurries, Obtain microballoon.Microballoon is roasted at 500 DEG C 1 it is small when, auxiliary agent C1 is made.Auxiliary formula is shown in Table 3.

Comparative example 9-16

The preparation flow of comparative example 9-16 is not both to substitute A with molecular sieve DB1-DB8, contrast auxiliary agent is made with embodiment 7 D1-D8.Contrast auxiliary formula is shown in Table 3.

Comparative example 17

The preparation flow of comparative example 17 with embodiment 7, be not both with conventional beta-molecular sieve (catalyst asphalt in Shenli Refinery produces, SiO₂/Al₂O₃=25, ammonium is exchanged to weight below the % of sodium oxide content 0.1, butt quality) substitution molecular sieve-4 A, contrast auxiliary agent is made D9.Contrast auxiliary formula is shown in Table 3.

Embodiment 8

Molecular sieve B and kaolin are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, obtain 40 weight of solid content % slurries are measured, obtained slurries are spray-dried, obtain microballoon.Microballoon is roasted at 500 DEG C 1 it is small when, the obtained present invention carries The auxiliary agent C2 of confession.Auxiliary formula is shown in Table 4.

Embodiment 9

Molecular sieve C, kaolin and boehmite are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, obtain 30 weight % slurries of solid content, stir the hydrochloric acid that lower addition concentration is 36 weight %, and the dosage of hydrochloric acid causes the pH value of slurries 3.0, it is beaten 45 minutes, then (prepares), stir 30 minutes according to 7 method of embodiment toward addition phosphorus aluminium glue in mixed serum, will Obtained slurries spray drying, obtains microballoon.Microballoon is roasted at 500 DEG C 1 it is small when, auxiliary agent C3 is made.Auxiliary formula is shown in Table 4。

Embodiment 10

Molecular sieve C, kaolin and boehmite are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, stirring Lower addition FeCl₃·6H₂The aqueous solution of O, obtains 30 weight % slurries of solid content, adds the hydrochloric acid that concentration is 36 weight %, hydrochloric acid Dosage make the pH value 3.0 of slurries, be then beaten 45 minutes, obtained slurries be spray-dried, obtain microballoon.By microballoon in When roasting 1 is small at 500 DEG C, auxiliary agent C4 is made.Auxiliary formula is shown in Table 4.

Embodiment 11

Decationized Y sieve water and Aluminum sol are mixed, add molecular sieve B, diatomite and boehmite, mashing 120 thereto Minute, stir lower addition FeCl₃·6H₂The aqueous solution of O, it is 35 weight % slurries to obtain solid content, adds the pH that hydrochloric acid adjusts slurries It is worth for 2.8, is beaten 30 minutes, add diammonium hydrogen phosphate solid, is beaten 30 minutes, then obtained slurries are spray-dried, are obtained To microballoon, microballoon is roasted at 500 DEG C 1 it is small when, auxiliary agent C5 is made.Auxiliary formula is shown in Table 4.

Embodiment 12

Molecular sieve-4 A and kaolin are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, stirs lower addition Co (NO₃)₂·6H₂Aqueous solution (Co (the NO of O₃)₂20 weight % of concentration), it is 38 weight % slurries to obtain solid content, is adjusted with hydrochloric acid The pH value of slurries is 3.3, is then beaten 30 minutes, then toward addition phosphorus aluminium glue in mixed serum (according to 7 method system of embodiment It is standby), stir 30 minutes, obtained slurries are spray-dried, obtain microballoon.Microballoon is roasted at 500 DEG C 1 it is small when, be made and help Agent C6.Auxiliary formula is shown in Table 4.

Embodiment 13

Molecular sieve D and boehmite are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, stirs lower addition Ni (NO₃)₂·6H₂Aqueous solution (Ni (the NO of O₃)₂20 weight % of concentration), the slurries of 30 weight % of solid content are obtained, adding hydrochloric acid makes The pH value 3.0 of slurries, is then beaten 45 minutes, and obtained slurries are spray-dried, obtain microballoon.

Thus obtained microsphere is roasted at 500 DEG C 1 it is small when after, add ammonium dibasic phosphate aqueous solution, 60 DEG C be warming up under stirring, React at this temperature after twenty minutes, by slurries vacuum filter, drying, when then roasting 1 is small at 500 DEG C, auxiliary agent C7 is made. Auxiliary formula is shown in Table 4.

Embodiment 14

Molecular sieve E, kaolin and waterglass are taken, decationized Y sieve water is added and is beaten 120 minutes, stirs lower addition FeCl₃· 6H₂The aqueous solution of O, obtains the slurries that solid content is 33 weight %, and the pH value that slurries are adjusted by hydrochloric acid is 3.0, is then beaten 45 minutes, then (prepare), stir 30 minutes, the slurry that will be obtained according to 7 the method for embodiment toward addition phosphorus aluminium glue in slurries Liquid is spray-dried, and obtains microballoon.Microballoon is roasted at 400 DEG C 1 it is small when, auxiliary agent C8 is made.Auxiliary formula is shown in Table 4.

Embodiment 15

Molecular sieve F, kaolin and boehmite are taken, decationized Y sieve water is added and Aluminum sol is beaten 120 minutes, obtain Solid content is 30 weight % slurries, and adding hydrochloric acid makes the pH value of slurries be 3.0, is beaten 45 minutes, then toward adding phosphorus in slurries Aluminium glue (is prepared) according to 7 method of embodiment, is stirred 30 minutes, and obtained slurries are spray-dried, obtain microballoon.

Thus obtained microsphere is roasted at 500 DEG C 1 it is small when after, with ammonium dibasic phosphate aqueous solution (P₂O₅8 weight % of concentration) according to 1:1 weight ratio dipping is uniform, after 120 DEG C of drying, when roasting 1 is small at 500 DEG C, then with FeCl₃·6H₂The aqueous solution of O (FeCl₃4 weight % of concentration) according to 1:1 weight ratio dipping is uniform, 120 DEG C of dryings, when then roasting 1 is small at 500 DEG C, system Obtain auxiliary agent C9.Auxiliary formula is shown in Table 4.

Embodiment 16-24

The following examples illustrate the cracking reaction of cracking additive provided by the invention by taking fixed fluidized-bed reactor as an example Effect.

Respectively by 30 grams of auxiliary agent C1-C9 when aging 12 is small under the conditions of 800 DEG C, 100% steam atmosphere.Take different weight The auxiliary agent C1-C9 through burin-in process (the industrial trade mark is the FCC of DVR-3 with the industrial FCC equilibrium catalysts of different weight respectively Equilibrium catalyst, 5) main character, which is shown in Table, to be mixed.Catalyst mixture is loaded to the reaction of small fixed flowing bed-tion reacting device In device, catalytic cracking is carried out to feedstock oil shown in table 6.Table 7 and table 8 give used catalyst mixture weight composition, reaction Condition and reaction result.

Comparative example 18-27

Following comparative example illustrates the situation using contrast auxiliary agent by taking fixed fluidized-bed reactor as an example.

Catalytic cracking is carried out to same feedstock oil as described in Example 16, the difference is that used catalyst is respectively 100% industry FCC equilibrium catalysts, according to contrast auxiliary agent D1-D9 of the method for embodiment 16 Jing Guo aging and industry FCC balances The mixture of catalyst.Table 7 gives used catalyst mixture composition, reaction condition and reaction result.

From table 7 and table 8 as can be seen that compared with contrast medium, catalyst aid provided by the invention, can effectively increase catalysis The yield of cracking liquefied gas yield, particularly isobutene and propylene, significantly increases propylene in catalytic cracking liquefied gas and different Butene concentration, improves the ethylene concentration in dry gas, while octane number improves, and catalytic cracking liquid is received and conversion ratio increase, burnt Charcoal is selectively improved.

Table 1

Table 2

Table 3

Table 4

Table 5

Project	Industrial equilibrium catalyst DVR-3
		Tenor, ppm
Ni/V	8762/1387
		Fe/Sb	5214/2512
Ca	1516
		Micro- index living	60

Table 6

Feedstock oil title	Manage defeated wax oil and mix residual oil
		Density (20 DEG C), gram per centimeter³	0.9070
Viscosity (100 DEG C), millimeter²/ the second	10.41
		Solidification point, DEG C	40
Carbon residue, weight %	3.1
		Element forms, weight %
C/H	86.39/12.53
		S/N	0.8/0.29
Four components, weight %
		Saturated hydrocarbons	56.8
Aromatic hydrocarbons	24.2
		Colloid	18.2
Asphalitine	0.8
		Tenor, ppm
V/Ni	0.8/7.0
		Fe/Cu	7.8/0.1
Na	2.6
		Boiling range, DEG C
Initial boiling point/5%	241/309
		10%/20%	343/387
30%/40%	413/432
		50%/60%	450/466
70%/80%	493/535

Table 7

Table 8

Claims

1. it is a kind of containing the assistant for calalytic cracking rich in mesoporous Beta molecular sieves, by weight and with the dry basis of the auxiliary agent On the basis of amount, the auxiliary agent contain the 10-75 weight % in terms of butt rich in mesoporous Beta molecular sieves, the 0- in terms of butt The clay of 60 weight %, the inorganic oxide binder of 15-60 weight % in terms of butt, with P₂O₅The 0-25 weight %'s of meter VIII race's metallic addition of phosphorus additive and the 0-15 weight % in terms of oxide, wherein, the Al distributed constants D of the molecular sieve Meet：0.4≤D≤0.8, wherein, D=Al (S)/Al (C), Al (S) represent the zeolite crystal using TEM-EDS methods measure The inside H in crystal face edge represent to use TEM-EDS methods apart from interior any aluminium content for being more than 100 square nanometers regions, Al (C) The outside H of the geometric center of crystal face described in the zeolite crystal of measure apart from interior any aluminium content for being more than 100 square nanometers regions, Wherein described H is that the crystal face edge point arrives the 10% of the crystal face geometric center distance；The micropore of the molecular sieve compares surface Product is 350-500 meters²/ gram, the ratio that the mesopore volume of the molecular sieve accounts for total pore volume is 30-70 bodies %.

2. auxiliary agent according to claim 1, wherein, the Al distributed constants D of the molecular sieve meets：0.55≤D≤0.75； The micropore specific area of the molecular sieve is 370-450 meters²/ gram, the mesopore volume of the molecular sieve accounts for the ratio of total pore volume For 35-60 bodies %.

3. auxiliary agent according to claim 1, wherein, it is described by weight and on the basis of the butt weight of the auxiliary agent Auxiliary agent contains the viscous of the 10-45 weight % rich in mesoporous Beta molecular sieves, in terms of butt of the 20-60 weight % in terms of butt Soil, the inorganic oxide binder of 25-50 weight % in terms of butt, with P₂O₅The phosphorus additive of the 5-15 weight % of meter and with VIII race's metallic addition of the 1-10 weight % of oxide meter.

4. auxiliary agent according to claim 1, wherein, the clay is included selected from kaolin, metakaolin, sepiolite, recessed At least one of convex rod stone, montmorillonite, tired de- stone, diatomite, galapectite, saponite, bentonite and hydrotalcite, the inorganic oxygen Compound binding agent is included selected from least one of boehmite, Aluminum sol, silicon-aluminum sol and waterglass.

5. auxiliary agent according to claim 1, wherein, the phosphorus additive introduced in the form of phosphorus-containing compound described in help Agent, the phosphorus-containing compound are included in the oxide selected from phosphorus, phosphate, phosphite, subphosphate and acid phosphate At least one；

VIII race metal is included selected from least one of Fe, Co and Ni, and VIII race metallic addition is with containing metal compound The form of thing introduces the auxiliary agent, and the metal-containing compound is included selected from oxide, hydroxide, chloride, nitrate, sulphur At least one of hydrochlorate, phosphate and organic compound.

6. a kind of preparation method of assistant for calalytic cracking, the preparation method include：

Mesoporous Beta molecular sieves, inorganic oxide binder and water mixing are will be enriched in, adds or is added without clay, be beaten, spray Mist is dried；Wherein, introduce or do not introduce phosphorus additive, introduce or do not introduce VIII race's metallic addition；

By weight and on the basis of the butt weight of the preparing raw material of the auxiliary agent, the preparing raw material of the auxiliary agent contains with dry The 10-75 weight % of base meter rich in mesoporous Beta molecular sieves, the clay of 0-60 weight % in terms of butt, in terms of butt The inorganic oxide binder of 15-60 weight %, with P₂O₅The phosphorus additive and the 0-15 in terms of oxide of the 0-25 weight % of meter VIII race's metallic addition of weight %；

The Al distributed constants D of the molecular sieve meets：0.4≤D≤0.8, wherein, D=Al (S)/Al (C), Al (S) represent to use The inside H in crystal face edge of the zeolite crystal of TEM-EDS methods measure contains apart from interior any aluminium more than 100 square nanometers regions Amount, Al (C) represent the outside H of geometric center using crystal face described in the zeolite crystal of TEM-EDS methods measure apart from interior any More than the aluminium content in 100 square nanometers regions, wherein the H, which is the crystal face edge point, arrives the crystal face geometric center distance 10%；The micropore specific area of the molecular sieve is 350-500 meters²/ gram, the mesopore volume of the molecular sieve accounts for total pore volume Ratio is 30-70 bodies %.

7. preparation method according to claim 6, wherein, the preparation process bag rich in mesoporous Beta molecular sieves Include：

A, sodium form Beta molecular sieves are subjected to alkali process in alkaline solution, and after being filtered and being washed, obtain alkali process point Son sieve；

B, it is gained alkali process molecular sieve in step a is molten in the Compound-acid dealumination agent being made of fluosilicic acid, organic acid and inorganic acid Dealumination treatment is carried out in liquid, and after being filtered and being washed, obtain described being rich in mesoporous Beta molecular sieves.

8. preparation method according to claim 7, wherein, the alkaline solution is selected from sodium hydroxide solution, hydroxide At least one of potassium solution, lithium hydroxide solution, ammonium hydroxide and high alkali deflection aluminium acid sodium solution；It is described high-alkali inclined in terms of oxide The sodium content of sodium aluminate solution is 270-310 g/l, and aluminium content is 30-50 g/l, and the density of high alkali deflection aluminium acid sodium solution is 1.25-1.45 grams per milliliter.

9. preparation method according to claim 8, wherein, the condition of alkali process includes described in step a：With butt weight The weight ratio of alkali in the molecular sieve and alkaline solution of meter is 1：(0.02-0.3)；Wherein, in the sodium hydroxide solution The weight of alkali is in terms of the weight of sodium hydroxide, and the weight of the alkali in the potassium hydroxide solution is in terms of the weight of potassium hydroxide, institute The weight of the alkali in lithium hydroxide solution is stated in terms of the weight of lithium hydroxide, the weight of the alkali in the ammonium hydroxide is with a hydration ammonia Weight meter, the weight of the alkali in the high alkali deflection aluminium acid sodium solution is in terms of the weight of sodium oxide molybdena.

10. preparation method according to claim 7, wherein, the condition of alkali process includes described in step a：Alkali process Temperature is 25-100 DEG C, when the time of alkali process is 0.5-6 small.

11. preparation method according to claim 7, wherein, organic acid described in step b be selected from ethylenediamine tetra-acetic acid, At least one of oxalic acid, citric acid and sulfosalicylic acid, the inorganic acid are at least one in hydrochloric acid, sulfuric acid and nitric acid Kind.

12. preparation method according to claim 7, wherein, the condition of dealumination treatment includes described in step b：With butt The molecular sieve of weight meter, fluosilicic acid, the weight ratio of organic acid and inorganic acid are 1：(0.03-0.5):(0.05-0.4): (0.05-0.5)；Treatment temperature is 25-100 DEG C, when processing time is 0.5-6 small.

13. preparation method according to claim 7, wherein, the condition of dealumination treatment includes described in step b：With butt The molecular sieve of weight meter, fluosilicic acid, the weight ratio of organic acid and inorganic acid are 1：(0.05-0.3):(0.1-0.3):(0.1- 0.3)。

14. preparation method according to claim 6, wherein, the clay is included selected from kaolin, metakaolin, Hai Pao At least one of stone, attapulgite, montmorillonite, tired de- stone, diatomite, galapectite, saponite, bentonite and hydrotalcite, it is described Inorganic oxide binder is included selected from least one of boehmite, Aluminum sol, silicon-aluminum sol and waterglass.

15. preparation method according to claim 6, wherein, the phosphorus additive introduces institute in the form of phosphorus-containing compound Auxiliary agent is stated, the phosphorus-containing compound includes oxide, phosphate, phosphite, subphosphate and acid phosphate selected from phosphorus At least one of salt；