title: Biomimetic Fenton-catalyzed lignin depolymerization to high-value aromatics and dicarboxylic acids.
abstract: By mimicking natural lignin degradation systems, the Fenton catalyst (Fe(3+), H2O2) 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.
authors: Department of Agricultural and Biological Engineering, University of Florida, PO Box 110570, Gainesville, FL 32611 (USA).
authors: Jijiao
authors: J
authors: Zeng
authors: Chang Geun
authors: CG
authors: Yoo
authors: Fei
authors: F
authors: Wang
authors: Xuejun
authors: X
authors: Pan
authors: Wilfred
authors: W
authors: Vermerris
authors: Zhaohui
authors: Z
authors: Tong
mesh_terms: D040761:Biomimetic Materials / Q000737:chemistry*; D003998:Dicarboxylic Acids / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D004987:Ethers / Q000737:chemistry; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008031:Lignin / Q000737:chemistry*; D058105:Polymerization; D013499:Surface Properties; D013696:Temperature
chemical_list: D003998:Dicarboxylic Acids; D004987:Ethers; C045076:Fenton's reagent; D000431:Ethanol; D008031:Lignin; D006861:Hydrogen Peroxide; D007501:Iron
keywords: biomass; carboxylic acids; depolymerization; iron; lignin