14results about "Molecular-sieve silica-polymorphs" patented technology

A novel synthetic crystalline molecular sieve material, designated boron ITQ-21, is provided. The boron ITQ-21 can be synthesized using an N,N-diethyl-5,8-dimethyl-2-azonium bicyclo [3.2.2] nonane cation as a structure directing agent. The boron ITQ-21 may be used in organic compound conversion reactions and / or sorptive processes.

The present invention relates to a method for preparing an inorganic monolith with multi-scale porosity, comprising: a) a step of emulsification of an oily phase in an acidic aqueous phase, wherein: a1) the aqueous phase comprises at least one acid, at least one surfactant and at least one inorganic precursor; a2) the oily phase is added to the mixture obtained in step a1); a3) the mixture obtained in step a2) is subjected to mechanical rotary stirring, preferably at a rotational speed of more than 100 revolutions per minute, in order to obtain an emulsion; b) a step of polycondensation of the emulsion obtained in step a3), preferably for 1 day to 20 days, in order to obtain a gel; c) a step of drying the gel obtained in step b); d) a first step of calcination at a temperature of between 160°C and 200°C, with a heating rate of between 0.5 and 3°C / min, the plateau being maintained for a period of 2 to 6 hours, preferably 3 hours; and e) a second step of calcination at a temperature of between 300°C and 900°C, preferably between 400°C and 800°C, with a heating rate of between 0.5 and 2°C / min, the plateau being maintained for 3 to 8 hours, preferably 7 hours.

A method for producing aluminosilicate SSZ-82 is disclosed. This method comprises (1) preparing a reaction mixture comprising an amorphous alumina source mainly containing aluminum hydroxide, an amorphous silica source mainly containing colloidal silica, a source of alkali metal cations, an organic structure directing agent including 1,6-bis(N-cyclohexylpyrrolidinium)hexanedication, hydroxide ions, a seed crystal comprising a crystalline molecular sieve having an SSZ-82 skeleton, and water; (2) heating the reaction mixture under crystallization conditions including a temperature of 100°C to 200°C for a time sufficient to form crystals of aluminosilicate zeolite; and (3) recovering at least a portion of the aluminosilicate zeolite from step (2).

This invention relates to the field of all-silica molecular sieve preparation technology, and discloses a method for preparing an MFI topological structure all-silica molecular sieve, the MFI topological structure all-silica molecular sieve and its application, comprising: (1) mixing molecular sieve mother liquor, organosilicate, organic template agent and KOH to obtain a colloidal mixture; (2) subjecting the colloidal mixture to a crystallization reaction; (3) performing solid-liquid separation on the crystallization product obtained in step (2) to obtain a wet molecular sieve and a crystallization mother liquor; drying and calcining the wet molecular sieve to obtain an MFI topological structure all-silica molecular sieve; (4) optionally concentrating the crystallization mother liquor, and then returning to step (1) to provide the molecular sieve mother liquor. This method can obtain highly crystallized, fine-particle all-silica-1 molecular sieves, reduce the raw material cost of molecular sieve synthesis, and improve the economics of the new gas-phase rearrangement process technology.

The present invention relates to a process for preparing a multi-scale porosity inorganic monolith comprising: a) an emulsification step of an oily phase in an acidic aqueous phase, in which: a1) the aqueous phase comprises at least one acid, at least one surfactant and at least one inorganic precursor; a2) the oily phase is added to the mixture obtained in step a1); a3) the mixture obtained in step a2 is subjected to mechanical rotary agitation, preferably at a rotational speed greater than 100 revolutions per minute, in order to obtain an emulsion; b) a polycondensation step of the emulsion obtained in step a3, preferably for 1 to 20 days, in order to obtain a gel; c) a drying step of the gel obtained in step b);d) a first calcination stage at a temperature between 160°C and 200°C, with a heating rate between 0.5 and 3°C / min, the plateau being maintained for a period of 2 to 6 hours, preferably for 3 hours; and e) a second calcination stage at a temperature between 300°C and 900°C, preferably between 400°C and 800°C, with a heating rate between 0.5 and 2°C / min, the plateau being maintained for 3 to 8 hours, preferably for 7 hours.

The application discloses a ZSM-5@Silicalite-1 core-shell molecular sieve and a preparation method and application thereof. The preparation method comprises the following steps: mixing an aluminum source, a silicon source I, a template agent, Silicalite-1 crystal seeds, water and alkali, crystallizing I, adding a silicon source II and water, crystallizing II in a closed container, drying, and obtaining the ZSM-5@Silicalite-1 core-shell molecular sieve; wherein the Silicalite-1 is a core, and the ZSM-5 is a shell. The mass ratio of the silicon source I / the silicon source II is fixed, the size of the Silicalite-1 crystal seeds and the adding amount are synchronously changed, and the ZSM-5@Silicalite-1 core-shell material with the same crystal size is obtained.

The invention relates to the technical field of preparation of all-silicon molecular sieves, and discloses a ZSM-5 type all-silicon-1 molecular sieve as well as a synthesis method and application thereof, the synthesis method comprises the following steps: (1) mixing a silicon source, KOH, organic alkali and water, and hydrolyzing to obtain a colloid mixture; wherein the silicon source is organic silicate ester, and the molar ratio of the silicon source, the KOH, the organic alkali and the water in terms of SiO2 is 1: (0.01-0.1): (0.04-0.25): (15-45); (2) crystallizing the colloid mixture, and then drying and roasting; the crystallization temperature is 95 to 150 DEG C, and the crystallization time is 0.5 to 5 days. When the all-silicon-1 molecular sieve prepared by the synthesis method is used as a catalyst to be applied to production of caprolactam, the conversion rate of cyclohexanone-oxime can be increased, and the service life of the catalyst can be prolonged.

The invention relates to a method for preparing a magnetic mesoporous silica-based (MMS) material, said method comprising the steps of: i) functionalising the silanol (-SiOH) groups of a mesoporous silica-based material by covalently grafting a ligand (L) comprising, at at least one end, a zwitterionic group of formula (I), in particular which is capable of complexing superparamagnetic particles: where n is an integer equal to 3 or 4; ii) incorporating superparamagnetic ferrite (MFe2O4NP) particles within the mesoporous material, by means of which a magnetic mesoporous silica-based (MMS) material is obtained.

The application relates to the technical field of catalysts, and discloses a spherical full-silicon molecular sieve catalyst, a preparation method thereof, and a method for gas-phase Beckmann rearrangement of cyclohexanone oxime, which comprises the following steps: (1) mixing a silicon source, an organic alkali and water, performing hydrolysis, and obtaining a colloidal mixture; (2) performing crystallization on the colloidal mixture, and then performing drying to obtain a molecular sieve raw powder; (3) optionally mixing the molecular sieve raw powder with a binder, and then performing rotary molding to obtain spherical particles; and (4) performing calcination on the spherical particles, and then contacting the spherical particles with an alkaline buffer solution containing an ammonium salt, ammonia water, a magnesium salt and a bromine salt; the content of the magnesium salt, calculated according to Mg elements, is 1-500 ppm based on the total amount of the alkaline buffer solution, and the content of the bromine salt, calculated according to Br elements, is 1-500 ppm. In a moving bed or fixed bed reaction system, the spherical ZSM-5 structure full-silicon molecular sieve catalyst has a high conversion rate of cyclohexanone oxime.

The Synthesis of Zeolite nanosheets from mining waste without using any OSDA or chemical reagents during the secondary growth of zeolite nanosheets is disclosed. The produced Zeolite nanosheet may be a synthetic material.

The application relates to the technical field of molecular sieves, and discloses a Silicalite-2 full-silicon molecular sieve, a preparation method and application thereof, the full-silicon molecular sieve method comprises the following steps: crystallizing a crystallization solution containing a silicon source, N,N,N-tri-butyl-1-butylammonium hydroxide and water, performing solid-liquid separation and calcining; wherein the molar ratio of the silicon source, the N,N,N-tri-butyl-1-butylammonium hydroxide and water is 1:0.2-0.5:6-15, and the silicon source is calculated according to SiO2; the crystallization temperature is 100-160 DEG C. The one-way service life of a catalyst can be improved when the molecular sieve is used for a propane dehydrogenation reaction by increasing the external surface area of the molecular sieve and the number of surface defect sites.

This invention provides a method for synthesizing Silicalite-1 molecular sieves using n-butylamine as a template agent, relating to the field of molecular sieve technology. The invention involves mixing n-butylamine, water, a silicon source, Silicalite-1 molecular sieve seed crystals, and sodium hydroxide to obtain an initial gel mixture. The silicon source includes one or more of silica, silica sol, silica gel powder, and tetraethyl orthosilicate. The initial gel mixture is then subjected to hydrothermal crystallization to obtain Silicalite-1 molecular sieves. This invention uses n-butylamine as a template agent and employs a seed-assisted synthesis method for Silicalite-1 molecular sieves, which significantly reduces the amount of n-butylamine used and the synthesis time. Compared with existing technologies, the synthesis method provided by this invention features inexpensive raw materials, low organic template agent usage, high product crystallinity, short synthesis time, and high yield, overcoming the disadvantages of existing synthesis methods that require expensive and large amounts of template agents.

The present invention addresses the problem of providing a metal-doped porous silica that can, when being blended in an article such as cosmetics including permanent wave treating agents, sustain being stably dispersed therein. The metal-doped porous silica according to the present invention providing a solution to the problem is surface modified with a polymer including a vinylpyrrolidone unit. Specific examples of the polymer including the vinylpyrrolidone unit include: a copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate; poly-vinylpyrrolidone; and the like.

This invention relates to the field of all-silica-1 molecular sieve preparation technology, and discloses a method for preparing all-silica-1 molecular sieves from waste catalysts, all-silica-1 molecular sieves and their applications, comprising: (1) carbonizing the waste cyclohexanone oxime gas-phase Beckmann rearrangement catalyst; (2) mixing the product obtained in step (1) with water and slurrying, and grinding until the particle diameter in the slurry is less than 20 μm; (3) mixing the slurry, KOH, organic template agent and alcohol to obtain a colloidal mixture; the composition of the colloidal mixture satisfies the following: the molar ratio of silicon species, KOH, organic template agent, alcohol and water (calculated as SiO2) is 1:(0.01-0.1):(0.04-0.15):(3.5-20):(15-45); (4) crystallizing the colloidal mixture, and then drying and calcining it. This method can eliminate solid waste, save the amount of silicon source and organic template agent used, and improve the economics of the new gas-phase rearrangement process technology.