Microwave-assisted efficient depolymerization of alkaline lignin in methanol/formic acid media

Bioresource Technology
Lupeng ShaoFeng Xu

Abstract

Microwave-assisted degradation of alkaline lignin in methanol/formic acid media was investigated, concerning the effect of formic acid (FA) amount, reaction temperature, and reaction time on lignin depolymerization. The highest bio-oil yield of 72.0 wt% including 6.7 wt% monomers was achieved at 160 °C and a FA-to-lignin mass ratio of 4 after a reaction time of 30 min. Among the monomers, the yield of 2,3-dihydrobenzofuran was the highest (3.00 wt%), followed by p-coumaric acid (1.59 wt%). Formic acid acted mainly through acid-catalyzed cleavage of the linkages in lignin. Oligomers in bio-oil were mainly composed of dimers (molecular weight: 253-378) and trimers (molecular weight: 379-510) according to the Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS) analysis. A possible mechanism about microwave-assisted depolymerization of lignin in methanol/formic acid media was proposed. This study will provide an efficient approach for lignin depolymerization.

References

Mar 12, 2010·Chemical Reviews·Joseph ZakzeskiBert M Weckhuysen
Jul 30, 2010·Bioresource Technology·Zhongshun YuanChunbao Charles Xu
Mar 23, 2012·ChemSusChem·Weiyin XuChristopher W Jones
Apr 22, 2014·Bioresource Technology·Chengjian DongRui Xiao
May 17, 2014·Science·Arthur J RagauskasCharles E Wyman
Nov 5, 2014·Nature·Alireza RahimiShannon S Stahl

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Citations

Sep 23, 2019·The Journal of Chemical Physics·Varsha JainNeeraj Rai
Sep 30, 2018·Bioresource Technology·Hongliang WangBin Yang
Aug 10, 2020·Bioresource Technology·Rusen ZhouKostya Ken Ostrikov

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