A method for directly preparing hzsm-5 molecular sieve and forming hzsm-5 molecular sieve

Abstract

The invention relates to a method for directly preparing an HZSM-5 molecular sieve and molding the HZSM-5 molecular sieve. The method is characterized by comprising the following steps: by taking a silicon source, an aluminum source, HZSM-5 seed crystal and a template agent as raw materials, firstly, grinding the solid raw materials, sufficiently mixing, further adding the liquid raw materials, mixing, putting into a crystallization kettle for crystallization, washing and drying the obtained sample, and roasting, thereby obtaining the HZSM-5 molecular sieve. Mainly aiming to solve the problems that the conventional synthesis process route is relatively long, a relatively large amount of template agent is used, a relatively great amount of waste liquids are discharged, the properties of a molecular sieve can be affected by a molding process, the molding process is relatively long in route, and the like, the invention provides the method for preparing the HZSM-5 molecular sieve and molding the HZSM-5 molecular sieve; the method can be used for directly preparing the HZSM-5 and molding the HZSM-5, and is relatively short in preparation and molding process route, very small in waste liquid discharge, simple in crystallization mode and high in yield.

Description

technical field [0001] The invention relates to a method for directly preparing HZSM-5 molecular sieve and forming the HZSM-5 molecular sieve. Background technique [0002] ZSM-5 molecular sieve is widely used in the fields of catalysis, adsorption and separation due to its unique three-dimensional intersecting pore structure, large specific surface area and pore volume, good thermal stability and hydrothermal stability. In industry, the hydrothermal method is usually used to synthesize HZSM-5. The general steps are as follows: put the raw materials such as silicon source, aluminum source, water, alkali and template agent into the crystallization kettle, age at a certain temperature to form gel, and then Crystallization at high temperature, and then through the processes of suction filtration, washing, drying and roasting to obtain NaZSM-5, and finally through the processes of ion exchange and roasting to obtain HZSM-5. The technological process is very cumbersome, and due ...

AI Technical Summary

Problems solved by technology

This method synthesizes molecular sieve raw powder in advance, then forms it with a binder, and then recrystallizes to obtain binder-free molding HZSM-5. The process is long.

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