Z-Scheme nanocomposite with high redox ability for efficient cleavage of lignin C–C bonds under simulated solar light
作者:Xuejiao Wu、Jinchi Lin、Huizhen Zhang、Shunji Xie、Qinghong Zhang、Bert F. Sels、Ye Wang
DOI:10.1039/d1gc03455c
日期:——
Depolymerization of lignin, a key component of lignocellulose, is a sustainable approach to provide value-added aromatics. Selective cleavage of recalcitrant C–C linkages is a key challenge for lignindepolymerization. Photocatalysis, which can provide highly reactive species under mild conditions, represents a potential strategy for such C–C bondcleavage. Here, we report an efficient approach to
木质素的解聚是木质纤维素的关键组成部分,是提供增值芳烃的可持续方法。选择性裂解顽固的 C-C 键是木质素解聚的关键挑战。光催化可以在温和条件下提供高活性物质,代表了这种 C-C 键断裂的潜在策略。在这里,我们报告了一种在室温下模拟太阳光下使用 Z 型 Ag 3 PO 4 -聚合氮化碳 (PCN) 纳米复合材料破坏木质素 C-C 键的有效方法。各种木质素模型化合物以 66%–95% 的高产率转化为芳香醛。我们的机理研究表明,C-C 键断裂主要涉及电子-空穴耦合的光氧化还原机制。Z-scheme Ag的构建3 PO 4 -PCN 异质结结构对于同时保持其组分的强还原和氧化能力至关重要,这是电子 - 空穴耦合 C α -C β键断裂的关键。目前的工作为通过能带结构工程设计用于 C-C 键裂解的有效半导体提供了有用的指导。
Heterogeneous manganese-oxide-catalyzed successive cleavage and functionalization of alcohols to access amides and nitriles
作者:Peipei He、Bo Chen、Liang Huang、Xixi Liu、Jingzhong Qin、Zehui Zhang、Wen Dai
DOI:10.1016/j.chempr.2022.02.021
日期:2022.7
manganese-oxide-catalyzed successive cleavage and amidation of C–C bonds in alcohols. A wide range of primary and secondary alcohols, 1,2-diols, and even β-O-4 and β-1 lignin model compounds can undergo C–Cbondcleavage smoothly to deliver one- or multiple-carbon shorter amides. Moreover, a slight modification of reaction conditions allows for the cleavage and cyanation of alcohols to access sterically hindered nitriles