Key Laboratory of Green Chemistry and Technology, Ministry of Education, Department of Chemistry, Sichuan University, Wangjiang Road, Chengdu, 610064, P.R. China.
Green Chemistry Center of Excellence, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.
ChemSusChem. 2020 Sep 7;13(17):4296-4317. doi: 10.1002/cssc.202001213. Epub 2020 Aug 3.
The efficient valorization of lignin could dictate the success of the 2 generation biorefinery. Lignin, accounting for on average a third of the lignocellulosic biomass, is the most promising candidate for sustainable production of value-added phenolics. However, the structural alteration induced during lignin isolation is often depleting its potential for value-added chemicals. Recently, catalytic reductive depolymerization of lignin has appeared to be a promising and effective method for its valorization to obtain phenolic monomers. The present study systematically summarizes the far-reaching and state-of-the-art lignin valorization strategies during different stages, including conventional catalytic depolymerization of technical lignin, emerging reductive catalytic fractionation of protolignin, stabilization strategies to inhibit the undesired condensation reactions, and further catalytic upgrading of lignin-derived monomers. Finally, the potential challenges for the future researches on the efficient valorization of lignin and possible solutions are proposed.
木质素的高效利用可以决定第二代生物炼制的成功。木质素平均占木质纤维素生物质的三分之一，是可持续生产高附加值酚类化合物最有前途的候选物。然而，在木质素分离过程中诱导的结构改变往往会耗尽其附加值化学品的潜力。最近，木质素的催化还原解聚似乎是一种很有前途和有效的方法，可以将其转化为获得酚类单体。本研究系统地总结了在不同阶段的深远和最先进的木质素增值策略，包括技术木质素的常规催化解聚、原木质素的新兴还原催化分级、抑制不希望的缩合反应的稳定策略，以及木质素衍生单体的进一步催化升级。最后，提出了木质素高效利用的未来研究的潜在挑战和可能的解决方案。
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