Process for the electrocatalytic preparation of ethylene oxide from ethylene mediated by chlorine based on cobalt-nickel spinel catalysts

By constructing a cobalt-nickel spinel catalyst on the electrode substrate surface and regulating the generation of active chlorine species, the problems of low Faraday efficiency and poor selectivity in the electrocatalytic preparation of ethylene oxide from ethylene were solved, achieving efficient and low-energy ethylene oxide preparation, which has good prospects for industrial application.

CN122189708APending Publication Date: 2026-06-12UNIV OF SCI & TECH OF CHINA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
UNIV OF SCI & TECH OF CHINA
Filing Date
2026-03-13
Publication Date
2026-06-12

AI Technical Summary

⚠Technical Problem

In existing technologies, the electrocatalytic production of ethylene oxide from ethylene has low Faraday efficiency and poor selectivity. Traditional chlorine-evolving electrode materials are difficult to effectively control the chloride ion oxidation process and the reaction with ethylene, leading to the generation of by-products. Furthermore, there are safety risks and energy consumption under high temperature and high pressure conditions.

⚗Method used

By using a cobalt-nickel spinel catalyst and optimizing its composition ratio and electrolyte concentration, it is constructed on the surface of the electrode substrate to regulate the generation of active chlorine species, thereby achieving the selective partial oxidation of ethylene to 2-chloroethanol and further generating ethylene oxide.

🎯Benefits of technology

This improved the Faradaic efficiency of ethylene oxidation to the intermediate 2-chloroethanol, enabling the preparation of ethylene oxide with high selectivity and high Faradaic efficiency under mild conditions, reducing energy consumption and carbon emissions, and enhancing catalyst stability and reaction efficiency.

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Abstract

The application discloses a method for preparing ethylene oxide by chlorine-mediated electrocatalysis of ethylene, based on a cobalt-nickel spinel catalyst, and is characterized by comprising the following steps: S1, carrying out a hydrothermal synthesis reaction on a raw material mixture containing a cobalt source, a nickel source, an inorganic alkali and water, and obtaining a catalyst after calcining the obtained product; S2, mixing the catalyst, a binder and an organic solvent to obtain a catalyst dispersion liquid; S3, coating the catalyst dispersion liquid on the surface of an electrode substrate and drying to obtain an electrocatalytic electrode; S4, taking the electrocatalytic electrode as an anode, and introducing ethylene into an electrolytic cell containing an electrolyte to carry out an electrocatalytic oxidation reaction, so as to obtain a first liquid-phase product 2-chloroethanol; and S5, adding a sodium hydroxide solution into the first liquid-phase product 2-chloroethanol, stirring in an ice water bath, and detecting the product. The method has low energy consumption and is environment-friendly, and overcomes the problems of low efficiency and poor selectivity existing in traditional high-temperature and high-pressure processes and existing electrocatalytic methods.
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