Preparation method and application of alumina supported ruthenium catalyst

By using defective alumina support and low-loaded ruthenium, a new alumina supported ruthenium catalyst was prepared, which solved the problems of high catalyst cost, low selectivity and instability in the prior art, and achieved a more efficient and economical cyclohexene reaction for benzene partial hydrogenation.

CN119657124AActive Publication Date: 2025-03-21HUBEI THREE GORGES LAB +1
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Patent Information

Application Number
CN202411953427.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-03-21
Estimated Expiration
2044-12-27

AI Technical Summary

Technical Problem

In the prior art, the catalyst for cyclohexene made from benzene partial hydrogenation has problems with high usage cost, low selectivity and instability of cyclohexene. Especially when using a low-load ruthenium-based catalyst, the selectivity of cyclohexene is not ideal.

Method used

Defective alumina (Al2O3-x) is used as a support, and the concentration of five-coordinated aluminum is increased by mixing with dicyanide and α-alanine and then roasting, so as to anchor the metal ruthenium, inhibit the growth of ruthenium clusters, and a new aluminum-supported ruthenium catalyst is prepared by loading low-load ruthenium (1-5 wt%).

Benefits of technology

The specific surface area and stability of the catalyst are improved, the catalytic activity is enhanced, the cost of use is reduced, and higher cyclohexene selectivity and lower by-product generation are achieved in the benzene part hydrogenation reaction.

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Abstract

The invention provides a preparation method of a novel aluminum oxide supported ruthenium catalyst, which is used in a reaction for preparing cyclohexene by partial hydrogenation of benzene. The preparation method comprises the following steps: mixing aluminum sulfate octadecahydrate serving as a raw material with dicyandiamide and alpha-alanine, roasting to prepare defective aluminum oxide, and loading ruthenium onto the defective aluminum oxide by adopting an impregnation method to prepare the Ru / Al2O3-x catalyst. The aluminum oxide prepared by the synthetic route has higher penta-coordinated aluminum concentration and higher specific surface area, is used for anchoring ruthenium atoms, can inhibit the growth of ruthenium clusters in catalytic partial hydrogenation reaction of benzene, and has higher catalytic activity and stability.
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