Catalyst for preparing propylene through methanol conversion and preparation method and application thereof

Abstract

The invention provides a catalyst for preparing propylene through methanol conversion as well as a preparation method and application thereof. The preparation method of the catalyst for preparing propylene through methanol conversion comprises the following steps: mixing a tetrapropylammonium bromide aqueous solution, a water glass aqueous solution and a sodium metaaluminate aqueous solution to obtain a mixed solution; carrying out crystallization treatment on the mixed solution at 150-210 DEG C for at least 6 hours, and washing, drying and roasting a crystallization product to obtain a Na-type ZSM5 molecular sieve; and carrying out ion exchange on the Na-type ZSM5 molecular sieve and an ion exchange solution, washing, drying and roasting to obtain the H-type ZSM5 molecular sieve. The preparation method provided by the invention is simple in technological process, good in repeatability and suitable for industrial production; the catalyst for preparing propylene by converting methanol obtained by the preparation method has the characteristics of high propylene selectivity and good catalytic stability.

Description

technical field [0001] The invention relates to propylene production technology, in particular to a catalyst for converting methanol to propylene, a preparation method and application thereof. Background technique [0002] As an important basic chemical raw material, propylene is widely used in the production of chemicals such as polypropylene, acrylonitrile and propylene oxide, and is the cornerstone of the modern petrochemical industry. In recent years, driven by the rapid growth in the demand for derivatives of propylene downstream products, especially polypropylene, the consumption of propylene has increased significantly, and the market potential is huge. [0003] At present, my country's propylene mainly comes from naphtha steam cracking co-production and catalytic cracking by-products. However, my country's oil resources are scarce, and the production capacity of propylene is far from meeting the demand for propylene in the domestic market. It is urgent to find a new...

AI Technical Summary

Problems solved by technology

Among them, the soft template method usually requires the use of additional, expensive templates, and there are many steps; the hard template method often requires high-temperature calcination to remove the synthesized template, but high-temperature calcination may lead to the destruction of the molecular sieve structure, thereby affecting The catalytic performance of ZSM-5 molecular sieve has adverse effects; the post-treatment method is simpler and easier than the first two methods, but the change of the silicon-aluminum ratio of the molecular sieve caused by chemical dissolution is uncontrollable

Although the hierarchically porous ZSM-5 molecular sieve synthesized by the above method has better catalytic performance than the traditional ZSM-5 molecular sieve, the above synthesis route is largely insufficient to support industrial production applications

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