Ce-sn shaped catalyst, its preparation method and application

By preparing Ce-Sn composite oxide packing catalysts, the problems of easy catalyst loss and low efficiency of traditional batch reaction were solved, and the catalytic activity and mechanical properties were improved, realizing the green, efficient and continuous production of ε-caprolactone.

CN122252170APending Publication Date: 2026-06-23HUNAN JUREN CHEMICAL NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN JUREN CHEMICAL NEW MATERIAL TECHNOLOGY CO LTD
Filing Date
2026-03-29
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing Ce-Sn composite oxide catalysts are in powder form, which are prone to loss, difficult to separate solid and liquid, and have insufficient mechanical strength. They cannot be directly packed into reactive distillation columns. Furthermore, traditional batch reaction processes result in low single-pass yields of ε-caprolactone and poor batch-to-batch product stability, making it difficult to achieve industrial-scale production.

Method used

We developed a Ce-Sn composite oxide packing catalyst adapted to reactive distillation processes. By optimizing the types and ratios of binders, pore-forming agents, extrusion aids, and adhesives, and combining them with specific drying and calcination processes, we prepared a strip-shaped, well-structured catalyst for the continuous synthesis of ε-caprolactone via reactive distillation of cyclohexanone oxidized by oxygen. This integrated catalytic reaction and distillation separation into the same equipment.

Benefits of technology

The mechanical strength and pore structure of the catalyst were improved, achieving a synergistic enhancement of catalytic activity and mechanical properties. This broke the reaction equilibrium limitation, reduced solvent consumption and separation energy consumption, and enabled the green, efficient and continuous production of ε-caprolactone.

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Abstract

This invention provides a Ce-Sn shaped catalyst, its preparation method, and its application. Using Ce-Sn composite oxide powder as the active base, and through appropriate selection and precise control of the proportions of binder, pore-forming agent, extrusion aid, and adhesive solvent, the catalyst is prepared through kneading, extrusion molding, drying, and programmed temperature calcination. It possesses high mechanical strength, a regular pore structure, and excellent catalytic stability. It can be directly loaded into a reactive distillation column under countercurrent gas-liquid conditions. The catalyst is loaded into the reaction-stripping section of the reactive distillation column, using cyclohexanone and benzaldehyde as raw materials, 1,2-dichloroethane as solvent, and oxygen as oxidant. Through countercurrent gas-liquid contact, Baeyer-Villiger catalytic oxidation is achieved, with simultaneous coupling of distillation separation to remove products and recover solvent in real time, breaking the reaction equilibrium and driving the reaction forward, enabling continuous production. This invention solves the technical problems of traditional Ce-Sn powder catalysts, such as easy loss, incompatibility with continuous production equipment, large solvent consumption, and poor product stability.
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