Preparation method of stepped hole heteroatom M-Beta molecular sieve

A technology of heteroatom and molecular sieve, which is applied in the field of preparation of heteroatom M-Beta nanocrystals, can solve the problems of reducing alkalinity of crystallization system, environmental hazards, autoclave pressure, etc., and achieves the improvement of nucleation efficiency and crystallization efficiency. The effect of cost reduction and synthesis time reduction
CN111439756APending Publication Date: 2020-07-24FUZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUZHOU UNIV
Publication Date
2020-07-24

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Abstract

The invention provides a preparation method of a stepped hole heteroatom M-Beta molecular sieve. Compared with an existing synthesis method, the method has the advantages that the M-Beta molecular sieve can be directly synthesized through a one-step steam-assisted method, and the inherent defects of traditional hydrothermal synthesis are overcome. Compared with the existing M-Beta synthesis method, the method has the advantages that the M-Beta molecular sieve with a regular morphology and a stepped pore structure can be synthesized without a nuclear promoter aluminum and a high-corrosivity crystallization aid hydrofluoric acid; the synthesis time is reduced to 48 hours, the steps are simple, and the energy consumption can be effectively reduced; little crystallization liquid is generated so that the pollution problem of a large amount of crystallization waste liquid can be effectively avoided; meanwhile, the problem that a large amount of waste acid is discharged due to the fact that strong acid must be used for pretreatment in a traditional secondary isomorphous substitution method and an aluminum-containing one-step synthesis method is solved.
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Description

technical field

[0001] The invention relates to a preparation method for synthesizing framework heteroatom M-Beta molecular sieves, specifically a preparation method for synthesizing [Al, F]-Free heteroatom M-Beta nanocrystals in one step by steam-assisted conversion. Background technique

[0002] Beta molecular sieve is the only molecular sieve with three-dimensional intersecting channels of twelve-membered rings, which has unique pore structure, acidity and good hydrothermal stability. The traditional Beta molecular sieve is a silica-alumina zeolite, but only relying on the traditional Al-Beta zeolite cannot greatly improve the application field of the BEA structure. The introduction of different transition metals (Ti, Fe, Co, Ga, etc.) into the zeolite framework can endow the silicon framework with separated, well-dispersed, and diverse catalytic active centers. The special pore structure of zeolite provides a suitable living space for these metal atoms, so that it has b...

Claims

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