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Biomimetic Fenton‐Catalyzed Lignin Depolymerization to High‐Value Aromatics and Dicarboxylic Acids
Author(s) -
Zeng Jijiao,
Yoo Chang Geun,
Wang Fei,
Pan Xuejun,
Vermerris Wilfred,
Tong Zhaohui
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201403128
Subject(s) - depolymerization , lignin , catalysis , chemistry , organic chemistry , dicarboxylic acid
By mimicking natural lignin degradation systems, the Fenton catalyst (Fe 3+ , H 2 O 2 ) can effectively facilitate lignin depolymerization in supercritical ethanol (7 MPa, 250 °C) to give organic oils that consist of mono‐ and oligomeric aromatics, phenols, dicarboxylic acids, and their derivatives in yields up to (66.0±8.5) %. The thermal properties, functional groups, and surface chemistry of lignin before and after Fenton treatment were examined by thermogravimetric analysis, pyrolysis–gas chromatography–mass spectrometry, 31 P NMR spectroscopy, and X‐ray photoelectron spectroscopy. The results suggest that the Fenton catalyst facilitates lignin depolymerization through cleavage of β‐ether bonds between lignin residues. The formation of a lignin–iron chelating complex effectively depresses lignin recondensation; thus minimizing charcoal formation and enhancing the yield of liquid products.