Related Experiment Video
Updated: May 6, 2026
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Pretreatment of Lignocellulosic Biomass with Low-cost Ionic Liquids
Published on: August 10, 2016
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Condensed lignin depolymerization via C-C bond cleavage with a disordered crystalline mesoporous zeolite.
Xiangchen Kong1, Leilei Bie2, Chao Liu3
1MOE Key Laboratory of Energy Thermal Conversion & Control, School of Energy and Environment, Southeast University, Nanjing, China. xiangchen.kong@seu.edu.cn.
Nature Communications
|February 27, 2026
Summary
A novel mesoporous zeolite efficiently breaks down condensed lignin, a biorefining byproduct. This process significantly boosts yields of valuable aromatic compounds, enabling sustainable lignin valorization.
Area of Science:
- Chemical Engineering
- Materials Science
- Catalysis
Background:
- Condensed lignin, a byproduct of pulping and biorefining, presents a challenge for sustainable biorefineries due to recalcitrant C-C bonds.
- These bonds limit lignin's reactivity and accessibility, hindering its efficient depolymerization and valorization.
- Developing effective methods for condensed lignin depolymerization is crucial for maximizing the value of biomass feedstocks.
Purpose of the Study:
- To develop an efficient catalytic strategy for the depolymerization of condensed lignin.
- To investigate the role of disordered crystalline mesoporous zeolite (Meso-Z) in breaking C-C bonds in lignin.
- To enhance the yield of aromatic monomers and dimers (MDs) from condensed lignin.
Main Methods:
- Utilized a disordered crystalline mesoporous zeolite (Meso-Z) with integrated strong acidity and enhanced mass transfer.
- Compared the performance of Meso-Z with conventional microporous zeolites for condensed lignin processing.
- Conducted mechanistic studies involving hydrolysis and hydrogenolysis of Cα-Caryl bonds facilitated by zeolite mesoporosity.
Main Results:
- Meso-Z achieved 3.7-7.9 times higher yields of aromatic monomers and dimers (32.0-45.6 wt%) compared to conventional zeolites.
- The yields of aromatic compounds exceeded the theoretical maximum based on C-O bond cleavage by 250-759% due to C-C bond cleavage.
- Mechanistic studies confirmed Brønsted and Lewis acid-assisted hydrolysis and hydrogenolysis of Cα-Caryl bonds.
- Meso-Z demonstrated robust recyclability with stable catalytic activity over ten cycles.
Conclusions:
- Disordered crystalline mesoporous zeolite (Meso-Z) offers an efficient strategy for depolymerizing condensed lignin.
- The synergistic integration of acidity and mesoporosity in Meso-Z facilitates C-C bond cleavage, significantly enhancing aromatic monomer and dimer yields.
- This approach provides a viable pathway for the valorization of industrial lignin streams, contributing to sustainable biorefining.
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