Nanosheet-shaped saPO-34 molecular sieve, method for preparing same, and use thereof

By preparing nanosheet-like SAPO-34 molecular sieves, the problems of diffusion limitation and rapid carbon deposition caused by large crystal grains in the existing technology have been solved, and a methanol-to-olefins reaction with high efficiency and long lifespan has been achieved.

CN117945433BActive Publication Date: 2026-06-30CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA PETROLEUM & CHEMICAL CORP
Filing Date
2022-10-20
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing SAPO-34 molecular sieves suffer from large crystal grains, which severely restricts the diffusion of catalytic active centers, leading to rapid carbon deposition, short catalyst lifetime, and poor product selectivity.

Method used

By employing specific steps and template agent combinations, nanosheet-like SAPO-34 molecular sieves were prepared. By controlling the crystallization conditions and calcination process, nanosheets with a thickness of 10–50 nm and a particle size of 100–500 nm were obtained, reducing mass transfer resistance and improving diffusion performance.

Benefits of technology

It significantly improves the reaction stability and low-carbon olefin selectivity of the catalyst, with a total yield of ethylene and propylene of up to 90% and a reaction stability improvement of 1 to 2 times, making it suitable for industrial applications.

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Abstract

This invention discloses a nanosheet-like SAPO-34 molecular sieve, its preparation method, and its applications. The preparation method includes the following steps: mixing an aluminum source, optionally water, and template agent R1, stirring, then sequentially adding a phosphorus source and a silicon source, stirring to obtain mixture I; then adding template agent R2, stirring to obtain mixture II, which is then placed in a reaction vessel for crystallization to obtain SAPO-34 molecular sieve powder, calcined to obtain nanosheet-like SAPO-34 molecular sieve. In the methanol-to-olefins (MTO) reaction, using the nanosheet-like SAPO-34 molecular sieve of this invention as a catalyst, compared with SAPO-34 molecular sieves prepared by conventional methods, exhibits higher selectivity for low-carbon olefins, higher diene yield, and greater reaction stability.
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