Preparation method of mesoporous Beta molecular sieve

Abstract

The invention belongs to the field of synthesis of crystalline aluminosilicate molecular sieves, and particularly relates to a preparation method of a mesoporous Beta molecular sieve. The mesoporous Beta molecular sieve prepared by using the method has a mesoporous structure, high relative crystallinity, high specific surface area and excellent diffusivity in a catalytic reaction. A used guiding agent solution can be prefabricated or may be concentrated Beta molecular sieve synthesis mother liquor. According to the invention, a silicon source and an aluminum source provided by a Y-type molecular sieve are used so as to achieve the synthesis of the mesoporous Beta molecular sieve; the participation of an organic template agent is avoided during the process; the synthesis mother liquid can be recycled; green synthesis is achieved; and manufacturing cost is substantially reduced.

Description

technical field [0001] The invention belongs to the field of synthesis of crystalline aluminosilicate molecular sieves, in particular to a preparation method of mesoporous Beta molecular sieves. Background technique [0002] Beta molecular sieve has a twelve-membered ring three-dimensional channel structure. Due to its high hydrothermal stability, good shape selectivity and acidity, Beta molecular sieve is used in isomerization, hydrocracking, benzene and propylene to produce cumene, It exhibits excellent catalytic performance in reactions such as aromatic hydrocarbon alkylation and toluene disproportionation (CN 106430230A). The synthesis of traditional molecular sieves is mainly based on hydrothermal method, and the synthesis of most new molecular sieves requires the addition of templates, and special templates need to be added when manufacturing pore structures. Such as hard templates: carbon-aerogels, carbon nanoparticles, mesoporous carbon, carbon nanotubes, etc. Howe...

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Problems solved by technology

The traditional preparation process has the disadvantages of high synthesis cost, high wastewater discharge, high COD, difficult treatment, and low product yield.

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