Preparation method of ZIF-67 derived cobalt-manganese catalyst and application of ZIF-67 derived cobalt-manganese catalyst in catalytic oxidation of benzene

ZIF-67-derived cobalt-manganese catalysts were prepared by etching with potassium permanganate. By optimizing the pore structure and active components, the problems of high space velocity, low temperature and stability of ZIF-67 catalysts in the catalytic oxidation of benzene were solved, and efficient and economical catalytic oxidation was achieved.

CN121004004AActive Publication Date: 2025-11-25NORTHEASTERN UNIV CHINA
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Patent Information

Application Number
CN202511537407.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-27
Publication Date
2025-11-25
Estimated Expiration
2045-10-27

AI Technical Summary

Technical Problem

Existing ZIF-67 catalysts struggle to balance high space velocity, low reaction temperature, and long-term stability when catalyzing the oxidation of benzene. Furthermore, residues are easily left behind during the preparation process, leading to a decrease in catalytic activity.

Method used

Potassium permanganate was used as an etchant and reacted with ZIF-67 suspension through a hydrothermal reaction to form a ZIF-67-derived cobalt-manganese catalyst. This optimized the pore structure and surface active components, forming Co-Mn synergistic active centers and avoiding residual impurities.

Benefits of technology

This method achieves efficient catalytic oxidation of benzene under high space velocity and low temperature conditions. The catalyst has high purity and good long-term stability, which significantly improves catalytic activity and lifespan, and reduces energy consumption and production costs.

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Abstract

The invention relates to a preparation method of a ZIF-67 derived cobalt-manganese catalyst and application of the ZIF-67 derived cobalt-manganese catalyst in catalytic oxidation of benzene, and belongs to the technical field of catalyst preparation. The preparation method comprises the following steps: preparing a ZIF-67 precursor; dispersing ZIF-67 in water to form a turbid liquid, and adding a potassium permanganate aqueous solution to carry out an etching reaction to obtain a mixed system; transferring the mixed system into a reaction kettle for hydrothermal reaction to obtain a black precipitate; and washing the black precipitate, drying, roasting, and grinding to obtain the ZIF-67 derived cobalt-manganese catalyst. According to the preparation method, the problem that residues are usually easy to remain in the conventional preparation method of the ZIF-67 catalyst is solved, and the Co-Mn8-T140 catalyst prepared by the preparation method disclosed by the invention can realize 90% of benzene conversion rate at the reaction temperature of about 210 DEG C under the reaction conditions that the air speed is up to 60000mL / (g.h), the benzene concentration is 1000ppm and the oxygen content is 20%.
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