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Oxidative Depolymerization of Cellulolytic Enzyme Lignin over Silicotungvanadium Polyoxometalates

1,2, 2 and 1,2,*
1
Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
2
Jilin Provincial Key Laboratory of Wooden Materials Science and Engineering, Beihua University, Binjiang East Road, Jilin 132000, China
*
Author to whom correspondence should be addressed.
Polymers 2019, 11(3), 564; https://doi.org/10.3390/polym11030564
Received: 25 January 2019 / Revised: 4 March 2019 / Accepted: 20 March 2019 / Published: 26 March 2019
(This article belongs to the Special Issue Properties, Applications and Perspectives of Lignin)
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Abstract

The aim of this study was to explore the catalytic performance of the oxidative depolymerization of enzymatic hydrolysis lignin from cellulosic ethanol fermentation residue by different vanadium substituted Keggin-type polyoxometalates (K5[SiVW11O40], K6[SiV2W10O40], and K6H[SiV3W9O40]). Depolymerized products were analyzed by gel permeation chromatography (GPC), gas chromatography–mass spectrometer (GC/MS), and two-dimensional heteronuclear single quantum coherence nuclear magnetic resonance (2D HSQC NMR) analysis. All catalysts showed an effective catalytic activity. The best result, concerning the lignin conversion and lignin oil production, was obtained by K6[SiV2W10O40], and the highest yield of oxidative depolymerization products of 53 wt % was achieved and the main products were monomer aromatic compounds. The HSQC demonstrated that the catalysts were very effective in breaking the β-O-4 structure, the dominant linkage in lignin, and the GPC analysis demonstrated that the molecular of lignin was declined significantly. These results demonstrate the vanadium substituted silicotungstic polyoxometalates were of highly active and stable catalysts for lignin conversion, and this strategy has the potential to be applicable for production of value-added chemicals from biorefinery lignin. View Full-Text
Keywords: cellulolytic enzyme lignin; polyoxometalates; oxidation; aromatic compounds cellulolytic enzyme lignin; polyoxometalates; oxidation; aromatic compounds
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Xu, W.; Li, X.; Shi, J. Oxidative Depolymerization of Cellulolytic Enzyme Lignin over Silicotungvanadium Polyoxometalates. Polymers 2019, 11, 564.

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