Preparation method of selective oxidation catalyst FeMo-coated 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

Application Number
CN202610464051.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
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

The invention provides a preparation method of a selective oxidation catalyst FeMo (at) ZSM-22. The preparation method comprises the following steps: preparing soluble molybdate and soluble ferric salt into a mixed metal salt solution; ultrasonically dispersing ZSM-22 molecular sieve powder in deionized water to obtain a molecular sieve suspension; under the condition of rapid stirring, slowly dropwise adding the mixed metal salt solution into the molecular sieve turbid liquid, and dropwise adding a precipitant to adjust the pH value to 2.0-5.0; and carrying out microwave aging, washing, drying and roasting to obtain the FeMo-coated ZSM-22 catalyst. According to the method, the ZSM-22 molecular sieve is added in situ in the coprecipitation synthesis process of the FeMo catalyst, so that high synergy of a redox site (FeMo) and a weakly acidic site (ZSM-22) on the nanoscale is realized. The obtained catalyst is used for a reaction for preparing formaldehyde through direct selective oxidation of dimethyl ether, the seesaw effect of activity and selectivity of a traditional pure metal oxide catalyst is broken through, the preparation cost is extremely low, the long-period anti-coking stability is good, and large-scale industrial production prospects are achieved.
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