32results about How to "Skeleton silicon aluminum ratio is high" patented technology

The invention discloses a method for synthesizing a Y type molecular sieve, and belongs to the technical field of preparation of catalysts. The method comprises the following steps of: mixing sodium metaaluminate and a silicon source in a reaction kettle, and performing rotary ageing to obtain a directing agent; adding the sodium metaaluminate and the directing agent into the silicon source in sequence, stirring, adding acidic aluminum salt, and continuously stirring to obtain silicon-aluminum gel; and crystallizing the silicon-aluminum gel in two steps, centrifuging, and drying to obtain the NaY type molecular sieve. The silicon-aluminum ratio of the synthesized NaY type molecular sieve is more than 5.0, and the average particle size of the sieve is not more than 100nm. The NaY type molecular sieve synthesized by the method is high in specific surface area, has higher performance in the aspects of converting macromolecules, reducing the secondary cracking of a product and the coking of a catalyst, and the like compared with the conventional Y type molecular sieve, is high in thermal stability and hydrothermal stability, is prepared from low-cost industrial raw materials, is environment-friendly, and has an industrial application prospect, and a framework of the sieve is high in silicon-aluminum ratio.

The invention provides a method for preparing a Y / EU-1 / ZSM-5 / ASA / heteropolyacid composite material containing regular mesopores. The method comprises the following steps: synthesizing a guiding agent, synthesizing small-grain-size Y-shaped molecular sieve by adopting a hydrothermal crystallization method; adding surfactant, EU-1 and ZSM-5 molecular sieve slurry and alkaline aluminum-source solution into the slurry containing a molecular sieve; washing, drying and roasting the product to obtain a mesoporous Y / EU-1 / ZSM-5 / ASA composite material; and adding a surfactant into an H3PMo12-X-YWXLaYO40.nH2O heteropolyacid, mixing and pulping with a Y / ASA material, aging and drying to obtain the mesoporous Y / EU-1 / ZSM-5 / ASA / heteropolyacid composite material.

The invention provides a preparation method of Y / SAPO-34 / ZSM-11 / ASA hierarchical porous material. The invention is characterized in that the method comprises the following steps: synthesizing a guideagent, synthesizing Y / SAPO-34 / ZSM-11 composite molecular sieve by hydrothermal crystallization, adding a surfactant, an alkaline aluminum source and / or alkaline silicon source solution into the slurryof Y / SAPO-34 / ZSM-11 molecular sieve, and washing, drying and roasting the product to obtain the mesoporous Y / SAPO-34 / ZSM-11 / ASA hierarchical porous material.

A modified molecular sieve is prepared from the raw molecular sieve powder containing organic templating agent through treating it in organic solvent, ion exchanging, removing Al, and supplementing Si. Its advantages are good crystal form, high crystallinity and low content of residual carbon.

The invention provides a method for preparing a Y / Gd2O3 / ZSM-23 / ZSM-5 / ASA composite material containing regular mesopores. The method comprises the following steps: firstly, preparing a guiding agent, preparing a Gd2O3 / ZSM-23 / ZSM-5 precursor; synthesizing a Y / Gd2O3 / ZSM-23 / ZSM-5 composite molecular sieve by adopting a hydrothermal crystallization method; adding a surfactant and an alkaline aluminum-source solution into the slurry containing the molecular sieve, adjusting the pH value; and washing, drying and roasting the precipitated product to obtain the Y / Gd2O3 / ZSM-23 / ZSM-5 / ASA composite material. In the Y / Gd2O3 / ZSM-23 / ZSM-5 / ASA composite material, the differential thermal failure temperature of the Y molecular sieve can be higher than 950 DEG C, the grain size is kept to be lower than 400nm. The composite material has the porous distribution characteristics of micropore-mesopore, mesopores in the surface ASA are regular mesopores, and the mesoporous size can be adjusted by changing the synthesizing process condition.

The invention discloses a method for preparing a multi-stage pore Y molecular sieve, which relates to the field of molecular sieve synthesis; specifically, it comprises the steps of: pre-preparing a Y-type molecular sieve with a silicon-aluminum ratio of 4-6:1 in an alkaline solution at 20-150°C. Processing; under anhydrous conditions, use an inert gas to carry SiCl 4 and / or SiHCl 3 Steam reacts with pretreated molecular sieves to dealuminate and replenish silicon; then treat with ammonium ion solution at 60-120°C for 0.1-3h; then roast, wash, and dry to finally obtain multi-stage channel Y-type molecular sieves; this invention adopts alkali treatment and chemical The combination of the method and method does not destroy the structure of the molecular sieve. The obtained molecular sieve has a high specific surface area and crystallinity. The prepared multi-stage channel Y molecular sieve has a silicon-aluminum ratio of 20-160; the generated secondary pores are interconnected, and the channels The diameter can be adjusted between 2-50μm according to the alkali treatment conditions; the relative crystallinity of molecular sieves is >70%.

The invention provides a Y type molecular sieve modification method. The Y type molecular sieve modification method is characterized by comprising the steps that (1) a NaY molecular sieve is activated for 1-10 h through polyhydroxy alcohol at 80-200 DEG C to obtain slurry A, wherein the alcohol-sieve weight ratio is (1-20):1; (2) the slurry A is cooled and mixed with organic alkali to obtain slurry B, wherein the alkali-sieve weight ratio is (0.1-1):1; (3) a silicon source and an aluminum source are sequentially added into the slurry B, and the mixture is aged to obtain slurry C, wherein the weight ratio of the silicon source (in terms of SiO2) to the NaY molecular sieve is (0.1-1):1, and the weight ratio of the aluminum source (in terms of Al2O3) to the silicon source (in terms of the SiO2) is (0.3-0.5):1; and (4) the slurry C is subjected to hydrothermal crystallization, and a product is recovered. By adoption of the Y type molecular sieve modification method, the silicon-aluminum ratio of a molecular sieve skeleton can be remarkably increased, meanwhile, the acid site number of the molecular sieve is increased, and the cracking activity of the molecular sieve is improved.

The invention provides a method for preparing a Y / Sm2O3 / SBA-3 / ASA composite material containing regular mesopores. The method comprises the following steps: preparing a guiding agent, preparing an Sm2O3 / SBA-3 precursor, and synthesizing a Y / Sm2O3 / SBA-3 composite molecular sieve from the reaction mixture by adopting a hydrothermal crystallization method; adding a surfactant and an alkaline aluminum-source solution into the Y / Sm2O3 / SBA-3 composite molecular sieve slurry, and adjusting the pH value to obtain a solid product; and washing, drying and roasting the product to obtain the Y / Sm2O3 / SBA-3 / ASA composite material of which the surface is coated with ASA. In the composite material, the differential thermal failure temperature of the Y-shaped molecular sieve can be higher than 950 DEG C, and the grain size is kept to be lower than 400nm. The composite material has the porous distribution characteristics of micropore-mesopore, mesopores in the surface ASA are regular mesopores, and the mesoporous size can be adjusted by changing the synthesizing process condition.

The invention provides a method for preparing a Y / EU-1 / ZSM-23 / ZSM-5 / ASA composite material containing regular mesopores. The method comprises the following steps: firstly, preparing a molecular sieve guiding agent, preparing an EU-1 / ZSM-23 / ZSM-5 precursor based on preparation of ZSM-23 / ZSM-5 molecular sieve slurry by a solid-like phase method; synthesizing a Y / EU-1 / ZSM-23 / ZSM-5 composite molecular sieve by adopting a hydrothermal crystallization method; and adding surfactant and alkaline aluminum-source solution into the slurry containing the molecular sieve; and washing, drying and roasting the product to obtain the composite material. In the Y / EU-1 / ZSM-23 / ZSM-5 / ASA composite material, the differential thermal failure temperature of the Y molecular sieve can be higher than 950 DEG C, the grain size is kept to be lower than 400nm. The composite material has the porous distribution characteristics of micropore-mesopore, mesopores in the surface ASA are regular mesopores, and the mesoporous size can be adjusted by changing the synthesizing process condition.

The invention provides a preparation method of a multistage porous material. The preparation method comprises following steps: step one, preparing a guiding agent; step two, preparing SBA-6 and ZSM-12composite molecular sieve slurry; step three, preparing Y / SBA-6 and ZSM-12 composite molecular sieve slurry; and step four, preparing a Y / SBA-6 / ZSM-12 / ASA multistage porous material. The prepared multistage porous material has the characteristics that the crystal grains of the NaY molecular sieve of the composite molecular sieve of the multistage porous material are small (100 to 400 nm), the silicon / aluminum ratio of the framework is high; the thermal stability is improved, compared with a corresponding NaY molecular sieve, the heat destroying temperature is increased by at least 5 DEG C, and a micro-meso pore structure, which is formed by micro pores with a diameter less than 1 nm and mesopores with a diameter of 3 to 10 nm, is formed.

The invention provides a hydrocracking catalyst capable of producing heavy naphtha and jet fuel and its preparation method and application. The method comprises: synthesizing a directing agent first, and then synthesizing Y / TS‑1 / APO‑1 by hydrothermal crystallization 5 composite molecular sieve, then add surfactant, alkaline aluminum source and / or alkaline silicon source solution to the slurry of Y / TS‑1 / APO‑5 molecular sieve, and the product is washed, dried and roasted to obtain mesoporous Y / TS‑1 / APO‑5 / ASA composite. then H 3 PMo 12‑ x PR x o 40 ·nH 2 The O heteropoly acid aqueous solution is mixed with the mesoporous Y / TS-1 / APO-5 / ASA composite material, then alumina and nitric acid are added, and the hydrocracking catalyst is obtained after kneading, rolling, extruding, drying and roasting. The catalyst can process heavy raw oil, and can produce more heavy naphtha and jet fuel.

The invention provides a Y / ZSM-22 / SAPO-34 / ASA / MOF composite material and a preparation method thereof. The method comprises the following steps: preparing a ZSM-22 / SAPO-34 molecular sieve slurry, and synthesizing a Y / ZSM-22 / SAPO-34 composite molecular sieve by adopting a hydrothermal crystallization method; adding a surfactant and an alkaline aluminum source into the slurry containing he molecular sieve, and adjusting the pH value to obtain a solid product; washing, drying and roasting the product to obtain a Y / ZSM-22 / SAPO-34 / ASA composite material, uniformly mixing and stirring with a metal salt aqueous solution, and drying to obtain a metal-loaded Y / ZSM-22 / SAPO-34 / ASA composite material; adding alcohol and amide organic solvent into carboxyl-containing organic acid, and uniformly mixing to obtain organic mixture; and adding the metal-loaded Y / ZSM-22 / SAPO-34 / ASA material into the organic mixture, uniformly stirring, and reacting to obtain the product.

A small grain Y-type molecular sieve with silicon-rich surface, characterized in that the molecular sieve body phase skeleton SiO2 / Al2O3 molar ratio is 5.0-6.0, the surface SiO2 / Al2O3 molar ratio is 8.0-13.0, and the unit cell parameter is 2.46-2.468nm , the weight content of sodium oxide is less than or equal to 0.1wt%, and the average grain diameter is 50-800nm.