Characterization of Structural Changes in Lignin from Biomass Oxidation during Formic Acid Production

LIU Jing, ZHU Yu-ting, L&#x000dc; Wei, WANG Chen-guang

doi:10.3969/j.issn.2095-560X.2019.03.002

Advances in New and Renewable Energy >

2019 , Vol. 7 >Issue 3: 207 - 215

DOI: https://doi.org/10.3969/j.issn.2095-560X.2019.03.002

Characterization of Structural Changes in Lignin from Biomass Oxidation during Formic Acid Production

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1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China;
2. CAS Key Laboratory of Renewable Energy, Guangzhou 510640, China;
3. Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development, Guangzhou 510640, China;
4. University of Chinese Academy of Sciences, Beijing 100049, China

Received date: 2019-02-22

Revised date: 2019-03-05

Online published: 2019-06-29

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Abstract

Characterization of lignin structural changes in acid oxidation is one of the key factors affecting the high-value utilization of lignin. In this paper, the oxidation of pinewood in the system of NaVO₃-DMSO-H₂SO₄ with O₂ as oxidant was studied. The effects of reaction time, catalysts and solid-liquid ratio on lignin structure change were investigated. High performance liquid chromatography, fourier transform infrared spectroscopy, gel permeation chromatography, gas chromatography, and 2D-heteronculear single quantum coherence were employed to analyze residues and dissolved lignin fractions. Results showed that the yield of formic acid was 75.1% when the solid-liquid ratio was 1:50 in the system of NaVO₃-DMSO-H₂SO₄ with H₂SO₄ concentration of 0.7wt.%. The lignin was oxidatively degraded into lignin fractions with M_w of 125-900 g/mol via the cleavage of C—O bonds. The aromatic structures in lignin fractions were oxidized into quinones.

Key words： lignin; acid oxidation; formic acid; carbon dioxide

Cite this article

LIU Jing, ZHU Yu-ting, LÜ Wei, WANG Chen-guang . Characterization of Structural Changes in Lignin from Biomass Oxidation during Formic Acid Production[J]. Advances in New and Renewable Energy, 2019 , 7(3) : 207 -215 . DOI: 10.3969/j.issn.2095-560X.2019.03.002

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