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

The invention belongs to the catalyst technical field, in particular to a ZSM-5 zeolite catalyst characterized by high ratio of silica and alumina as well as a preparation method and the application thereof. The catalyst, taking a pure silicon compound with activity as a silicon source, is made by a hydrothermal synthesis method by adding trace aluminum. The ratio of silica and alumina in the zeolite catalyst is over 1,000, sub-micron crystal particles with open channels have large surface area and good molecular diffusivity. The catalyst in the reaction of MTP has excellent catalytic activity, high selectivity of propylene, and high ratio of propylene and ethylene. The catalyst has simple regeneration method and good restoration of performance after regeneration.

The invention discloses a hydrogenation catalyst and a preparation method thereof. The catalyst comprises hydrogenation active metal components and a carrier consisting of the small crystal grain Y-shaped molecular sieve, amorphous silica-alumina and aluminum oxide, wherein the small crystal grain Y-shaped molecular sieve is a small crystal grain Y-shaped molecular sieve subjected to hydro-thermal treatment. The hydrocracking catalyst provided by the invention has the characteristics of high catalyst activity, excellent target product selectivity, great preparation flexibility, and the like, thus the catalyst can be used for preparing products such as heavy naphtha, aviation kerosene, diesel oil and the like with high yield and good product quality.

The invention relates to a USY molecular sieve modification method. The USY molecular sieve modification method comprises the following steps of adding a citric acid solution having a concentration of 0.10-0.35mol/L into a USY molecular sieve according to a solid-liquid quality ratio of 1: 5 for modification with stirring at a reaction temperature of 500-1200 DEG C, after a temperature is increased to a preset temperature of 600-900 DEG C, adding an ammonium fluosilicate solution having a concentration of 0.05-0.20mol/L into the reaction product at a rate of 0.1-3.5ml/min according to a volume ratio of citric acid to the ammonium fluosilicate solution of 0.5-3.0, after material addition, carrying out a reaction process at a temperature of 50-120 DEG C for 1-6h, carrying out washing by deionized water until a pH value is 7, and carrying out constant-temperature drying at a temperature of 110 DEG C. The USY molecular sieve obtained by the USY molecular sieve modification method has substantially improved specific surface, secondary pore volume and moderate strong acid level and can be used for a hydrocracking catalyst for maximizing middle distillates as desired products.

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.

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

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/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 provides a USY type molecular sieve modification method and application thereof.The USY type molecular sieve modification method comprises the following steps that an industrial USY molecular sieve is added into an organic acid-chelating agent composite dealumination modifier according to the solid-to-liquid ratio under the stirring condition, stirring continues to be conducted, a reaction is conducted, and milk white turbid liquid is obtained; and washing the milky white suspension until the milky white suspension is neutral, and drying to obtain the modified USY type molecular sieve. According to the novel method for preparing the modified USY type molecular sieve by utilizing the synergistic effect of the organic acid and the chelating agent, the modified USY type molecular sieve has the structural characteristics of large specific surface and small unit cell parameters.

The invention relates to a method for preparing a high-silica alumina ratio Y-type molecular sieve. The method is characterized in that water is added in a NaY molecular sieve for beating, polyhydroxy-alcohol is added according to the mass ratio of alcohol to the sieve at 1-20:1, a slurry A is obtained through processing at the temperature of 80-200 DEG C; the slurry A and organic base are mixed to obtain a slurry B according to the mass ratio of the alcohol to the sieve at 0.1-1:1; the slurry B and a silicon source are mixed and a mixture is aged to obtain a slurry C, by metering with SiO2, the mass ratio of the silicon source to the NaY molecular sieve is 0.1-1:1; the slurry C is subjected to hydrothermal crystallization in an enclosed reaction vessel, and the product is recovered. The method can effectively increase the silica-alumina ratio of the molecular sieve, and can make the crystallization integrity of the molecular sieve better, a structure of the molecular sieve is more stable, and the higher molecular sieve yield can be kept.