Preparation method of metal-modified SAPO-34 molecular sieve and catalyst containing the molecular sieve

Abstract

The invention discloses a preparation method of a metal-modified SAPO-34 molecular sieve. The method includes: first mixing a template agent with metal salt solution to form a metal complex in the preparation process of raw powder of the molecular sieve; then adding materials such as aluminum source, phosphorus source, silicon source to prepare gel mixture; and finally obtaining the metal-modified SAPO-34 molecular sieve through ageing, hydrothermal crystallization, washing, drying, roasting and the like. The metal-modified SAPO-34 molecular sieve prepared by the method has comparatively high degree of crystallinity and can effectively improve the selectivity of ethene and propylene as reaction catalyst for preparing olefins by methanol. The invention discloses a preparation method of the metal-modified SAPO-34 molecular sieve and a catalyst containing the molecular sieve.

Description

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AI Technical Summary

Benefits of technology

This new type of material called Mobil-43 was found that had better performance when compared against previous materials like zeolite LS-75. It could be useful as an alternative or replacement for ZSM-5 which were previously developed due to its high activity towards hydrogen transfer processes at lower temperatures than other types of molecules such as silica gel).

Problems solved by technology

This patented technical problem addressed in this patents relates to developing efficient chemical reactions involving alkoxides like alcohols at high temperatures under strong bases called stochloroaluminate(SiAlON). These chemistries have been studied intensively because they can be easily modified without losing their original shape through heat treatment. They also allow for easier separation of certain compounds due to their unique structures formed inside these particles. To improve the effectiveness and selectiveness of catalysis processes, we propose introducing metals into SiALN zeolites instead of traditional ones.

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