A method for one-step preparation of methylamine by carbon dioxide hydrogenation amination

By loading an indium zirconium metal auxiliary catalyst onto a silica support, the problems of low CO2 conversion and high CO selectivity in the carbon dioxide hydrogenation amination reaction were solved, achieving efficient preparation of methylamine. Moreover, the catalyst preparation method is simple and easy to industrialize.

CN122502276APending Publication Date: 2026-08-04XIAMEN UNIV
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Patent Information

Application Number
CN202610661633.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-14
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

Existing catalysts exhibit low CO2 conversion rates and high CO selectivity as a byproduct in the carbon dioxide hydrogenation amination reaction. Furthermore, catalyst preparation is complex, making it difficult to achieve highly selective methylamine production.

Method used

Catalysts containing microporous or mesoporous silica supports are loaded with indium, zirconium, and metal additives selected from nickel, copper, palladium, rhodium, platinum, etc., and are prepared by sequential assembly method to form In-Zr-M active centers. The reaction conditions are controlled to achieve high activity and high selectivity.

Benefits of technology

It achieves high carbon dioxide conversion (>50%), methylamine selectivity (>80%) and low CO selectivity (<20%), and controls the distribution of methylamine products by adjusting the feed gas ratio. The catalyst preparation is simple and easy to scale up.

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Abstract

A method for one-step preparation of methylamine by hydrogenation amination of carbon dioxide, belonging to the field of catalysis. In a fixed-bed reactor, carbon dioxide, hydrogen, and ammonia are reacted. The catalyst comprises a microporous or mesoporous silica support, and the active component includes indium, zirconium, and at least one metal promoter selected from nickel, copper, palladium, rhodium, and platinum; the In 3d... 5 / 2 The binding energy is 444.0~444.7 eV, which is more than 0.2 eV lower than that of pure indium oxide; the single-pass conversion rate of carbon dioxide is not less than 50%, the total selectivity of methylamine is not less than 80%, and the selectivity of the byproduct carbon monoxide is not higher than 20%. This invention constructs a unique In-Zr-M active center, with In, Zr, and M uniformly co-distributed at the nanoscale. By adjusting the NH3 / CO2 ratio, the ratio of dimethylamine to trimethylamine can be controlled. The catalyst of this invention exhibits excellent performance and good stability, and has broad application prospects in the fields of carbon dioxide resource utilization and green synthesis of methylamine.
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