Catalytic depolymerization/degradation of alkali lignin by dual-component catalysts in supercritical ethanol

Cheng Zou; Haizhu Ma; Yunpu Guo; Daliang Guo; Guoxin Xue

doi:10.21967/jbb.v3i1.161

Catalytic depolymerization/degradation of alkali lignin by dual-component catalysts in supercritical ethanol

doi: 10.21967/jbb.v3i1.161

a. Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China;
b. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, China;
c. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

基金项目:

This work was supported by the National Key Research and Development Program of China (Grant 2016YFE0125800), the National Natural Science Foundation of China (Grant 31500492), China Postdoctoral Science Foundation (Grant 2017M612035), Zhejiang Provincial Natural Science Foundation of China (Grant LY16C160005), the Foundation (Grant 201601) of Tianjin Key Laboratory of Pulp & Paper (Tianjin University of Science & Technology), the open fund of State Key Laboratory of Pulp and Paper Engineering (Grant No. 201605) and the Science Foundation of Zhejiang Sci-Tech University (Grant No. 14012079-Y).

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出版历程

Catalytic depolymerization/degradation of alkali lignin by dual-component catalysts in supercritical ethanol

Cheng Zou^a,b,
Haizhu Ma^a,
Yunpu Guo^a,
Daliang Guo^{a,c
, ,},
Guoxin Xue^a

a. Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou 310018, China;
b. Tianjin Key Laboratory of Pulp & Paper, Tianjin University of Science & Technology, Tianjin 300457, China;
c. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China

Funds:

摘要

摘要: Depolymerization of lignin is an important step to obtain lignin monomer for the synthesis of functional bio-polymers. In this paper, catalytic degradation/depolymerization of an alkali lignin was investigated in a supercritical ethanol system. The process conditions were optimized in terms of lignin monomer yield, and the liquid products and solid residue were characterized. Results show that the conversion rate of the alkali lignin was improved in both the Ni₇Au₃ catalyzed and Nickel-catalyzed systems with supercritical ethanol as the solvent. The maximum lignin conversion rate was 69.57% and 68% respectively for the Ni₇Au₃ and Nickel-based catalysis systems. Gas chromatography/mass spectroscopy (GC/MS) analysis indicated that the catalytic depolymerization products of alkali lignin were mainly monomeric phenolic compounds such as 2-methoxyphenol. The highest yield of 2-methoxyphenol (84.72%) was achieved with Ni₇Au₃ as the catalyst.
- Bi-metallic catalysis /
- Alkali lignin /
- Supercritical ethanol /
- 2-Methoxyphenol
Abstract: Depolymerization of lignin is an important step to obtain lignin monomer for the synthesis of functional bio-polymers. In this paper, catalytic degradation/depolymerization of an alkali lignin was investigated in a supercritical ethanol system. The process conditions were optimized in terms of lignin monomer yield, and the liquid products and solid residue were characterized. Results show that the conversion rate of the alkali lignin was improved in both the Ni₇Au₃ catalyzed and Nickel-catalyzed systems with supercritical ethanol as the solvent. The maximum lignin conversion rate was 69.57% and 68% respectively for the Ni₇Au₃ and Nickel-based catalysis systems. Gas chromatography/mass spectroscopy (GC/MS) analysis indicated that the catalytic depolymerization products of alkali lignin were mainly monomeric phenolic compounds such as 2-methoxyphenol. The highest yield of 2-methoxyphenol (84.72%) was achieved with Ni₇Au₃ as the catalyst.
- Bi-metallic catalysis /
- Alkali lignin /
- Supercritical ethanol /
- 2-Methoxyphenol