[Nature Catalysis] 我室程俊教授、张庆红教授和王野教授发表论文:Solar energy-driven lignin-first approach to full utilization of lignocellulosic biomass under mild conditions

2018年10月08日

我室程俊教授、张庆红教授和王野教授在 Nature Catalysis 上发表论文:Solar energy-driven lignin-first approach to full utilization of lignocellulosic biomass under mild conditions

文章链接:https://www.nature.com/articles/s41929-018-0148-8

摘要:

The lignin-first concept offers an opportunity to utilize the entire lignocellulosic biomass efficiently. However, current conversion strategies rely on high-temperature hydrogenolysis by supported metal catalysts, leading to low-functionalized products or difficulty in separation of solid catalyst from cellulose/hemicellulose. Here, we report the fractionation and valorization of lignocellulose via solar energy-driven conversion of native lignin at room temperature. We found that cadmium sulfide quantum dots not only catalyse the cleavage of β-O-4 bonds in lignin models quantitatively but also are efficient for the conversion of native lignin within biomass into functionalized aromatics under visible light, while cellulose/hemicellulose remain almost intact. Further, the colloidal character of quantum dots enables their facile separation and recycling by a reversible aggregation–colloidization strategy. The β-O-4 bond in lignin is cleaved by an electron–hole coupled photoredox mechanism based on a Cα radical intermediate, in which both photogenerated electrons and holes participate in the reaction.