Preparation method of hierarchical pore ZSM-5 molecular sieve

Abstract

The invention belongs to the field of preparation of hierarchical pore ZSM-5 molecular sieves. The invention particularly relates to a preparation process for synthesizing a hierarchical pore ZSM-5 molecular sieve by taking various high-silicon tailings as a unique silicon source under the participation of a solvent-free and mesoporous-free template agent. Pretreated silicon-containing tailings and sodium sulfate decahydrate are used as raw materials; the raw materials are mixed by using a solvent-free self-assembly method, the mixture is directly put into a reaction kettle, sealed and stood at a certain temperature to synthesize the hierarchical pore ZSM-5 molecular sieve, no solvent participates in the molecular sieve synthesis process, the initial raw materials are only ground and uniformly mixed, and then the mixture is transferred into the reaction kettle for crystallization reaction, so the synthesis process is simplified. The solvent-free self-assembly method is applied to the process for synthesizing the hierarchical pore ZSM-5 molecular sieve by taking silicon-containing tailings as the raw material for the first time. According to the method, the hierarchical pore ZSM-5 molecular sieve is synthesized by taking the silicon-containing tailings as the raw material through the solvent-free self-assembly method, the process is simple, the application range is wide, the environmental problem caused by the tailings can be relieved, and high-added-value utilization of the tailings can be achieved.

Description

technical field [0001] The invention belongs to the field of preparation of multi-stage porous ZSM-5 molecular sieves. Specifically, high-silicon tailings are used as the only silicon source for the preparation of hierarchically porous ZSM-5 molecular sieves, and at the same time, the preparation process of synthesizing hierarchically porous ZSM-5 molecular sieves without the participation of solvents, and the synthesis process of this process does not need to add mesoporous templates agent. Background technique [0002] At present, my country's tailings stockpile has exceeded 10 billion tons, and it is increasing at a rate of 10 million tons per year. The stockpiling of tailings not only occupies land, pollutes the environment, but also brings safety hazards such as dam breaks, which seriously restricts economic and social development. Therefore, governance and reuse have become inevitable. As a secondary resource that has been misplaced and has yet to find "suitable tech...

AI Technical Summary

Problems solved by technology

The process is simple and the utilization rate of the equipment is high. There is no report on the preparation of multi-level porous ZSM-5 molecular sieves by solvent-free self-assembly method using high-silicon tailings as raw materials.

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