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Cubic mesoporous molecular sieve catalyst with micropore canals, preparation method and use thereof

A cubic mesopore and catalyst technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of materials that are rarely reported in literature, poor hydrothermal stability, weak acidity, etc.

Inactive Publication Date: 2010-03-31
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with microporous molecular sieves, mesoporous molecular sieves not only have a larger pore size, but also have a larger specific surface area, but their acid strength is not enough, and their hydrothermal stability is poor, which also hinders their application in industrial production.
[0004] Hexagonal MCM-41 and cubic MCM-48 mesoporous molecular sieves are mesoporous materials with long-range order. Because their pore walls are amorphous and have weak acidity, their application range is limited.
Materials with a cubic structure are rarely reported in the literature

Method used

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  • Cubic mesoporous molecular sieve catalyst with micropore canals, preparation method and use thereof
  • Cubic mesoporous molecular sieve catalyst with micropore canals, preparation method and use thereof
  • Cubic mesoporous molecular sieve catalyst with micropore canals, preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix 163.94g of sodium metaaluminate, 140g of sodium hydroxide and 14726g of a 10% aqueous solution of tetraethylammonium hydroxide by mass, then add 1201.68g of white carbon black and stir for 2 hours, then add the reactant to polytetrafluoroethylene to react In the kettle, the reaction kettle was placed in an oven for primary crystallization at 80°C for 8 hours to produce a silicon-aluminum precursor, and 2915.68g of hexadecyltrimethylammonium bromide and four The water of ethyl ammonium hydroxide aqueous solution and the remaining amount of 4746.6g deionized water are mixed evenly, and then added to the silicon aluminum precursor, and the evenly stirred reactants are transferred into a polytetrafluoroethylene reactor, and the reactor is placed in an oven Secondary crystallization at 80°C for 108 hours, self-assembled to form a mesoporous molecular sieve material, filtered, washed, dried at room temperature, and calcined at 400°C for 8 hours to remove the template and o...

Embodiment 2

[0044] Mix 163.94g of sodium metaaluminate, 160g of sodium hydroxide and 58904g of a 10% aqueous solution of tetraethylammonium hydroxide by mass, then add 12016.8g of white carbon black and stir for 2 hours, then add the reactant to polytetrafluoroethylene to react In the kettle, the reaction kettle was placed in an oven for primary crystallization at 100°C for 6 hours to produce a silicon-aluminum precursor, and 14578.4g of hexadecyltrimethylammonium bromide and four The water of ethyl ammonium hydroxide aqueous solution and the remaining amount of 986.4g deionized water are mixed evenly, and then added to the silicon aluminum precursor, and the evenly stirred reactants are transferred into a polytetrafluoroethylene reactor, and the reactor is placed in an oven Secondary crystallization at 100°C for 60 hours, self-assembled to form a mesoporous molecular sieve material, filtered, washed, dried at room temperature, and calcined at 500°C for 5 hours to remove the template to ob...

Embodiment 3

[0046] Mix 666.41g of aluminum sulfate, 180g of sodium hydroxide and 63048g of 10% tetraethylammonium bromide aqueous solution, then add 124998g of tetraethylorthosilicate and stir for 2 hours, then add the reactant to the polytetrafluoroethylene reactor In the process, put the reactor into an oven and carry out primary crystallization at 140°C for 3 hours to produce a silicon-aluminum precursor. Add 26880g of tetradecyltrimethylammonium bromide and minus 10% of tetraethyl ammonium bromide After mixing the water of ammonium bromide aqueous solution and 15256.8g deionized water of the remaining amount evenly, they were added to the silicon-aluminum precursor, and the uniformly stirred reactant was transferred to a polytetrafluoroethylene reactor, and the reactor was placed in an oven. Perform secondary crystallization at 140°C for 24 hours, self-assemble to form a mesoporous molecular sieve material, filter, wash, dry at room temperature, and bake at 700°C for 4 hours to remove ...

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Abstract

The invention relates to a cubic mesoporous molecular sieve catalyst with micropore canals, a preparation method and use thereof. The catalyst comprises the raw materials of an aluminium source, a silicon source, sodium hydroxide, a template, surfactant and de-ionized water, and is prepared through the following steps: firstly preparing a silicon-aluminium precursor; and then utilizing a self-assembly function between the precursor and the surfactant to obtain stable molecular sieve materials. The preparation method comprises two methods of hydro-thermal synthesis and microwave synthesis. Dueto the adoption of the microwave synthesis method, the cubic mesoporous molecular sieve catalyst in the invention has the advantages of shortening the crystallization time, obtaining a synthesized molecular sieve with a cubic mesoporous structure, having micropore canals, having acid strength similar to that of a ZSM-5 molecular sieve, and having relatively higher catalytic activity when used forthe catalytic cracking reaction of 1,3,5-tri-isopropyl benzene.

Description

technical field [0001] The invention relates to a cubic mesoporous molecular sieve catalyst with micropore channels, belonging to the fields of catalytic chemistry, inorganic chemistry and physical chemistry. [0002] The invention also relates to the preparation method and application of the catalyst. Background technique [0003] Microporous molecular sieves are important shape-selective catalysts with well-developed micropores and strong acidity, but their small pore size makes it difficult for macromolecules to enter the pores, which greatly limits their industrial applications. In 1992, Mobil Corporation reported for the first time that a new type of mesoporous molecular sieve series material M41S was synthesized in a hydrothermal system. Compared with microporous molecular sieves, mesoporous molecular sieves not only have a larger pore size, but also have a larger specific surface area, but their acid strength is insufficient and their hydrothermal stability is poor, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06C01B39/04C07C4/18
Inventor 李凤艳崔苗孙桂大张玲玲孙艳茹
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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