Adhesive-free SAPO-34/ZSM-5 composite molecular sieve and preparation method thereof

Abstract

The invention relates to an adhesive-free SAPO-34 / ZSM-5 composite molecular sieve and a preparation method thereof, which aim to solve the problems of complex process, high cost, large pollution, low activity of an adhesive-containing catalyst and low strength of an adhesive-free catalyst in preparation of a molecular sieve by a hydro-thermal synthesis method in the prior art. The problems are well solved through the adoption of the technical scheme that the preparation method comprises the following steps: firstly mixing a silicon source, an aluminum source, a phosphorus source and a ZSM-5 molecular sieve with water according to a certain proportion to form gel, crushing the gel into particles in certain sizes after being dried, and then placing the gel in steam containing an organic template agent to be crystallized at 120-220 DEG C for 24-100 hour to obtain the adhesive-free SAPO-34 / ZSM-5 composite molecular sieve. The adhesive-free SAPO-34 / ZSM-5 composite molecular sieve can be used in a reaction to prepare arene with methyl alcohol or dimethyl ether.

Description

technical field [0001] The invention relates to a binder-free SAPO-34 / ZSM-5 composite molecular sieve and a preparation method thereof. [0002] Background technique [0002] Aromatics, especially light aromatics such as BTX (benzene, toluene, xylene), are important basic organic chemical raw materials. With the continuous development of global industry and economy in recent years, the demand for aromatics continues to grow. At present, the main sources of aromatics are naphtha reforming and pyrolysis gasoline hydrogenation processes, both of which use petroleum as raw materials for production. However, with the continuous consumption of petroleum resources and rising prices, the production cost of aromatics using petroleum as raw material has risen sharply. Therefore, in the long run, the direct conversion of methanol to aromatics is a very promising route for the production of aromatics. Currently reported catalysts for methanol conversion to aromatics are usually co...

AI Technical Summary

Problems solved by technology

One of the technical problems to be solved by the present invention is that the process of preparing molecular sieves by hydrothermal synthesis method in the prior art is complicated, the cost is high, the pollution is relatively large, and the catalysts containing binders have low activity and the catalysts without binders have poor strength. , to provide a binder-free SAPO-34 / ZSM-5 composite molecular sieve, which has the characteristics of high reactivity, simple preparation process, low cost and little pollution

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