氢解
光催化
化学
光化学
催化作用
键裂
串联
电子顺磁共振
木质素
有机化学
材料科学
物理
核磁共振
复合材料
作者
Nengchao Luo,Min Wang,Hongji Li,Jian Zhang,Huifang Liu,Feng Wang
出处
期刊:ACS Catalysis
[American Chemical Society]
日期:2016-10-06
卷期号:6 (11): 7716-7721
被引量:236
标识
DOI:10.1021/acscatal.6b02212
摘要
One of the challenges of depolymerizing lignin to valuable aromatics lies in the selective cleavage of the abundant C-O bonds of beta-O-4 linkages. Herein we report a photocatalytic oxidation hydrogenolysis tandem method for cleaving C-O bonds of beta-O-4 alcohols. The Pd/ZnIn2S4 catalyst is used in the aerobic oxidation of a-C OH of beta-O-4 alcohols to alpha-C=O with 455 nm light, and then a TiO2 NaOAc system is employed for cleaving C-O bonds neighboring the alpha-C=O bonds through a hydrogenolysis reaction by switching to 365 nm light. Interestingly, the oxidation-hydrogenolysis tandem reaction can be conducted in one pot to offer ketones and phenols (up to 90% selectivity) via a dual light wavelength switching (DLWS) strategy. EPR and metal loading experiments elucidate that Ti3+ in TiO2 is hydrogenolysis through electron transfer from Ti3+ to the beta-O-4 ketones. formed in situ and is responsible for the photocatalytic
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