Preparation method of hierarchically porous Y-type molecular sieve

Abstract

The invention discloses a preparation method of a hierarchically porous Y-type molecular sieve. The method comprises the following steps: mixing a silicon source and an aluminium source at 5-60 DEG C,and standing and aging the mixture to prepare seed crystal glue; mixing the silicon source, the seed crystal glue and the aluminium source at 15-70 DEG C, and stirring the mixture to obtain sol; mixing the sol, a co-structure- directing agent and a template agent, stirring the mixture for 0.5-8 h, heating the obtained sol to 90-120 DEG C, crystallizing the sol for 6-72 h, and performing filtering, washing, drying and roasting to obtain the hierarchically porous Y-type molecular sieve. The co-structure directing agent and the template agent adopted in the preparation method are cheap, available and small in dosage and are easily separated from volume phase; the obtained hierarchically porous Y-type molecular sieve is high in relative crystallinity, mesoporous channels are regular, microporous channels and mesoporous channels intersect, and mesoporous diameter distribution is uniform.

Description

technical field [0001] The invention belongs to the field of molecular sieve materials and their preparation, and specifically relates to a method for preparing multi-stage Y molecular sieves through hydrothermal crystallization by using organosilane as a co-structure directing agent and anionic surfactant as a template. Background technique [0002] Because of its excellent pore structure and suitable surface acidity, Y-type molecular sieve has been widely used in the fields of adsorption, separation and catalysis. It has been used as the main active component of petrochemical catalysts in catalytic cracking and hydrocracking. With the increasingly heavy feed oil, improving the accessibility of the active center of refining catalysts and improving their catalytic conversion ability to macromolecules has become the focus of petrochemical catalyst development. With the continuous development of new synthetic techniques for molecular sieve materials, multi-level porous molecul...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a multi-level porous Y molecular sieve, which uses an anionic surfactant as a mesoporous template to form an ordered mesoscopic structure, and uses a co-structure directing agent as a linking agent The bridge between the mesoporous structure and the microporous structure solves the problems that the microporous template and the mesoporous template cannot be reasonably matched, connected and co-built during the self-assembly process. Synthesis of hierarchically porous Y molecular sieves by one-step hydrothermal method

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