A method for preparing phenolic chemicals by catalytic transfer hydrogenolysis of lignin using a cobalt-based nitrogen-carbon composite material

By using a cobalt-based nitrogen-carbon composite catalyst to catalyze the hydrogenolysis of lignin transfer under conditions without external hydrogen, the problems of high equipment cost, high safety risk and insufficient catalyst stability in the existing technology have been solved, realizing the efficient conversion of lignin and the preparation of high-value-added phenolic compounds.

CN119350131BActive Publication Date: 2026-05-26SOUTH CHINA UNIV OF TECH
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Patent Information

Application Number
CN202411322524.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-23
Publication Date
2026-05-26
Estimated Expiration
2044-09-23

AI Technical Summary

Technical Problem

Existing lignin hydrogenolysis technology relies on external hydrogen, resulting in high equipment costs, high energy consumption, and safety risks. Precious metal catalysts are expensive, and existing non-precious metal catalysts lack stability and activity, making it difficult to efficiently convert lignin into high-value-added phenolic compounds.

Method used

Using cobalt-based nitrogen-carbon composite material as a catalyst and organic small molecule alcohol and formic acid as a mixed solvent, lignin transfer hydrogenolysis was catalyzed under conditions without external hydrogen. By constructing a hierarchical porous structure and regulating electronic interactions, efficient depolymerization of lignin and preparation of phenolic compounds were achieved.

Benefits of technology

High conversion rates of lignin and high yields of phenolic products were achieved under mild conditions, reducing energy consumption, improving catalyst stability and activity, and significantly enhancing the selectivity and yield of monophenolic products.

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Abstract

This invention discloses a method for preparing phenolic chemicals by hydrogenolysis of lignin catalyzed by a cobalt-based nitrogen-carbon composite material. Using organosoluble lignin as raw material, a cobalt-based nitrogen-carbon composite material as catalyst, and a mixed solvent of small organic molecule alcohol and formic acid, the reaction is carried out under an inert gas atmosphere of 0.5–3 MPa, maintaining a reaction temperature of 210–250 °C, and a reaction time of 2–6 h. This method catalyzes the depolymerization of lignin to obtain a series of p-hydroxyphenyl products, achieving high-value utilization of lignin. The lignin conversion rate of this invention is as high as 89.6%, the total yield of monophenolic products can reach 17.7%, of which the yield of p-hydroxyphenyl products reaches 9.0%, with a selectivity of 50.8%. The catalyst preparation process used in this invention is simple and can catalyze the hydrogenolysis of lignin by short-chain alcohols and carboxylic acid solvents under mild conditions to obtain high-value-added chemicals such as p-hydroxyphenyl products.
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