A preparation method of a selective oxidation catalyst FeMo@ZSM-22

The FeMo@ZSM-22 catalyst prepared by co-precipitation-microwave aging method solves the problem of balancing activity and selectivity in the selective oxidation of dimethyl ether, achieving efficient dimethyl ether conversion and formaldehyde selectivity, reducing the catalyst preparation cost, and facilitating industrial production.

CN122124857APending Publication Date: 2026-06-02DALIAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
DALIAN UNIV OF TECH
Filing Date
2026-04-09
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

In existing technologies for the selective oxidation of dimethyl ether to formaldehyde, it is difficult to achieve both low-temperature catalyst activity and target product selectivity. Furthermore, the catalyst is prone to sintering and deactivation, resulting in high preparation costs and making large-scale industrialization difficult.

Method used

FeMo@ZSM-22 catalyst was prepared by coprecipitation-microwave aging method. By forming strong interfacial interactions on the surface of ZSM-22 molecular sieve, combining acidity and one-dimensional channels to form a coating structure, the activation energy of dimethyl ether CH bond is reduced, thus avoiding deep oxidation of formaldehyde.

Benefits of technology

Achieving a dimethyl ether conversion rate of over 65% and a formaldehyde selectivity of over 85% under mild conditions, significantly reducing deep oxidation products, the process is simple, easy to scale up, and reduces production costs.

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Abstract

This invention provides a method for preparing the selective oxidation catalyst FeMo@ZSM-22. The method includes: preparing a mixed metal salt solution by dissolving soluble molybdate and soluble iron salt; ultrasonically dispersing ZSM-22 molecular sieve powder in deionized water to obtain a molecular sieve suspension; slowly adding the mixed metal salt solution dropwise to the molecular sieve suspension under rapid stirring, and adding a precipitant to adjust the pH to 2.0-5.0; and obtaining the FeMo@ZSM-22 catalyst after microwave aging, washing, drying, and calcination. This invention incorporates ZSM-22 molecular sieve in situ during the co-precipitation synthesis of the FeMo catalyst, achieving a high degree of synergy between the redox sites (FeMo) and the weakly acidic sites (ZSM-22) at the nanoscale. The resulting catalyst is used for the direct selective oxidation of dimethyl ether to formaldehyde, not only overcoming the seesaw effect between activity and selectivity in traditional pure metal oxide catalysts, but also exhibiting extremely low preparation cost, good long-term anti-coking stability, and promising prospects for large-scale industrial production.
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Citation Information

Patent Citations

  • CN113019388A

  • CN119661335A