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Related Experiment Video

Updated: Jun 6, 2025

Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Extraction of Lignin with High β-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield

Published on: January 7, 2019

Depolymerization of lignin over heterogeneous Co-NC catalyst.

Fei Song¹, Kai Du², Huamei Yang³

¹Liaoning Key Lab of Lignocellulose Chemistry and BioMaterials, Liaoning Collaborative Innovation Center for Lignocellulosic Biorefinery, School of Light Industry and Chemical Engineering, Dalian Polytechnic University, Dalian 116034, China; CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

Journal of Environmental Sciences (China)

|December 1, 2024

Summary

This summary is machine-generated.

Researchers developed a novel redox-neutral system for lignin depolymerization using a cobalt-nitrogen-carbon (Co-NC) catalyst. This green chemistry approach efficiently breaks down lignin into valuable products without external oxidants or reductants.

Keywords:

Aromatic chemical Co-NC Depolymerization Lignin Mild conditions β-O-4 model compounds

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Area of Science:

Green Chemistry
Catalysis
Biomass Valorization

Background:

Lignin depolymerization is challenging due to its complex structure.
Existing methods often require harsh conditions or expensive catalysts.

Purpose of the Study:

To develop a green and atom-economic lignin depolymerization system.
To establish a non-noble metal heterogeneous catalytic system for lignin valorization.

Main Methods:

Utilized a cobalt-nitrogen-carbon (Co-NC) catalyst.
Employed a redox-neutral system, avoiding external oxidants/reductants.
Conducted mechanistic studies using control reactions and deuterium labeling.

Main Results:

Achieved efficient lignin depolymerization via a cascade dehydrogenation and hydrogenolysis pathway.
Identified Cα-OH dehydrogenation and Cβ-O bond cleavage as key steps.
Demonstrated hydrogen transfer from the substrate's alcohol moiety.

Conclusions:

The Co-NC catalyst enables the first non-noble metal redox-neutral lignin valorization.
The coupled cascade reaction is highly efficient and atom-economic.
This method offers a sustainable route to valuable aromatic compounds from lignin.