Visible light-enabled selective depolymerization of oxidized lignin by an organic photocatalyst.,Chemical Communications

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Visible light-enabled selective depolymerization of oxidized lignin by an organic photocatalyst.
Chemical Communications ( IF 4.3 ) Pub Date : 2020-08-13 , DOI: 10.1039/d0cc01127d
Shuyuan Li ₁ , Zhongkai Hao , Kaixuan Wang , Min Tong , Yanan Yang , Huating Jiang , Yao Xiao , Fang Zhang

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The development of an economic, environmental-friendly and energy-saving process for the selective depolymerization of lignin is an outstanding challenge. Herein, a novel and efficient visible-light-induced photocatalytic process for the selective depolymerization of lignin model compounds and organosolv lignin was first developed by using perylene diimide (PDI) as a metal-free organocatalyst. Interestingly, it can completely decompose the oxidized lignin models to phenolic and ketone fragmentation molecules with very high selectivity at room temperature under visible light illumination. Furthermore, the use of a home-made photocatalytic continuous-flow reactor efficiently shortened the reaction time within an hour. Even for organosolv lignin, nearly 86% mass ratio of lignin was degraded to low-molecular-mass monoaromatic or diaromatic products. We found that superior performances were realized by single-electron transfer (SET) from the photoexcited strongly reducing PDI˙⁻ anion to the ketone groups of the β-O-4 linkage in the lignin.

中文翻译：

可见光使氧化的木质素通过有机光催化剂选择性解聚。

木质素的选择性解聚的经济，环保和节能工艺的发展是一个巨大的挑战。本文中，首先通过使用per二酰亚胺（PDI）作为无金属有机催化剂，开发了一种新颖，有效的可见光诱导的光催化方法，用于木质素模型化合物和有机溶剂木质素的选择性解聚。有趣的是，它可以在室温下在可见光照射下以非常高的选择性将氧化的木质素模型完全分解为酚和酮裂解分子。此外，使用自制的光催化连续流反应器有效地缩短了一个小时内的反应时间。即使对于有机溶剂木质素，木质素的质量比率也接近86％被降解为低分子质量的单芳族或二芳族产物。^-木质素中β-O-4键合酮基的阴离子。

更新日期：2020-09-24

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