A method for catalytic depolymerization of lignin into phenolic compounds using RuNiZn / Nb2O5 catalyst.

By replacing precious metals with RuNiZn/Nb2O5 catalysts, the problem of high cost of lignin depolymerization was solved, and efficient conversion into phenolic compounds was achieved, reducing the amount of precious metals used and the severity of the reaction, and improving the yield.

CN117645530BActive Publication Date: 2026-03-17XI AN JIAOTONG UNIV
1 Cites 2 Cited by

Patent Information

Application Number
CN202311659296.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-05
Publication Date
2026-03-17
Estimated Expiration
2043-12-05

AI Technical Summary

Technical Problem

Existing lignin depolymerization technologies use large amounts of precious metal catalysts, resulting in high costs. Furthermore, the traditional pyrolysis process requires harsh conditions, making it difficult to efficiently convert lignin into high-value chemicals.

Method used

The RuNiZn/Nb2O5 catalyst is used to replace the precious metal with a multi-metal catalyst, which improves the acidity and reducing power of the catalyst, reduces the amount of precious metal used, and carries out the depolymerization reaction in a hydrogen environment. The preparation methods include initial wet impregnation and hydrogen reduction, and the reaction conditions are mild.

Benefits of technology

It improves the yield of lignin depolymerization products, reduces catalyst and energy costs, and achieves efficient conversion into phenolic compounds, with a specific exemplary yield of up to 40.6 wt%.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

This invention belongs to the field of high-value utilization technology of biomass resources, and discloses a method for catalyzing the depolymerization of lignin into phenolic compounds using a RuNiZn / Nb2O5 catalyst. The method includes: uniformly mixing the RuNiZn / Nb2O5 catalyst, lignin-containing biomass feedstock, and water; stirring under hydrogen atmosphere to carry out the depolymerization reaction; after the reaction, cooling to room temperature and performing solid-liquid separation; evaporating the solvent to obtain the hydrogenated depolymerization product containing monophenols. In this invention, the RuNiZn / Nb2O5 catalyst employs a technique of replacing precious metals with various non-precious metals, which improves the catalyst's reactivity and reduces the amount of precious metals used. This increases the yield of lignin depolymerization products, provides milder depolymerization reaction conditions, and ultimately significantly reduces the catalyst preparation cost and the energy cost of the lignin depolymerization process.
Need to check novelty before this filing date? Find Prior Art