Y/eu-1/zsm-5/asa/heteropolyacid composite material and preparation method thereof

Abstract

The invention provides a method for preparing a Y / EU-1 / ZSM-5 / ASA / heteropolyacid composite material containing regular mesopores. The method comprises the following steps: synthesizing a guiding agent, synthesizing small-grain-size Y-shaped molecular sieve by adopting a hydrothermal crystallization method; adding surfactant, EU-1 and ZSM-5 molecular sieve slurry and alkaline aluminum-source solution into the slurry containing a molecular sieve; washing, drying and roasting the product to obtain a mesoporous Y / EU-1 / ZSM-5 / ASA composite material; and adding a surfactant into an H3PMo12-X-YWXLaYO40.nH2O heteropolyacid, mixing and pulping with a Y / ASA material, aging and drying to obtain the mesoporous Y / EU-1 / ZSM-5 / ASA / heteropolyacid composite material.

Description

technical field [0001] The present invention provides a kind of Y / EU-1 / ZSM-5 / ASA / heteropolyacid composite material and preparation method thereof, at first by Y molecular sieve, EU-1 molecular sieve, ZSM-5 molecular sieve and amorphous silicon aluminum (ASA) through In-situ coating synthesis of Y / ASA composite material, and then mixing heteropoly acid aqueous solution with Y / EU-1 / ASA composite material, beating, aging at constant temperature, and drying to obtain Y / EU-1 / ZSM-5 / ASA / heteropolyacid Polyacid composites. Background technique [0002] Molecular sieve complex refers to a composite material that combines molecular sieves and other substances through the interaction between molecules, atoms or ions. Regular materials with mesoporous structures such as MCM-41 mesoporous molecular sieves are suitable for the transformation of organic macromolecules due to their large pore structure, but their poor thermal stability, hydrothermal stability and weak acidity limit their ...

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Problems solved by technology

[0017] The preparation methods of micro-mesoporous composite materials mentioned in the above documents or patents are either complicated in process or take a long time in the synthesis process

CN102000604A introduces a microwave treatment process in the process of synthesizing Y / MCM-41 composite molecular sieve, increases auxiliary equipment, and greatly increases the cost of synthesizing composite molecular sieve

In addition, the mesoporous part in the micro-mesoporous composite material mentioned in the above documents or patents is irregular pores

In the above patents, heteropolyacids are generally loaded or mixed with macroporous amorphous structure materials such as alumina and silica-alumina, but these materials have relatively low specific surface area compared with regular and ordered mesoporous materials, which reduces the specific surface area of ​​heteropolyacids. Catalytic activity

Due to the small pore size of microporous molecular sieves and relatively large heteropolyacid molecules, the loss of specific surface area and pore volume after loading is large, and it is difficult to exert catalytic activity.

The mesoporous molecular sieves developed in recent years have greatly improved the specific surface area, pore volume and pore size of molecular sieves. However, mesoporous molecular sieves such as SBA-15 and MCM-41 have poor thermal stability. Collapse, prone to permanent loss of catalytic activity

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