文献类型：期刊文献

英文题名：Electrocatalytic cleavage of aryl ether C-O linkages in lignin model dimers

作者：Zhai, Qiaolong[1] Han, Shuangmei[1] Wang, Kui[1,2] Jiang, Jianchun[1,2] Xu, Junming[1,2]

第一作者：Zhai, Qiaolong

通信作者：Xu, JM[1]

机构：[1]Chinese Acad Forestry, Natl Engn Lab Biomass Chem Utilizat, Key & Open Lab Forest Chem Engn,SFA, Key Lab Biomass Energy & Mat,Inst Chem Ind Forest, Nanjing 210042, Jiangsu, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Efficient Proc & Utilizat Forest Re, Nanjing, Peoples R China

年份：2022

卷号：235

外文期刊名：FUEL PROCESSING TECHNOLOGY

收录：;EI(收录号：20220089249);Scopus(收录号：2-s2.0-85132407596);WOS:【SCI-EXPANDED(收录号:WOS:000877406300004)】；

基金：The authors would like to thank the National Natural Science Foundation of China (32171713) .

语种：英文

外文关键词：Lignin; Electrocatalytic hydrodeoxygenation; Aryl ether; Phosphotungstic acid

摘要：Electrocatalytic hydrodeoxygenation (ECH) is a promising strategy for upgrading lignin-derived compounds to hydrodeoxygenation products under mild conditions. Here, we investigated the C - O bonds cleavage and oxygen-containing intermediates hydrogenation of lignin-derived aryl ether dimers, including Diphenyl ether (4-0-5 linkage), Benzyl phenyl ether (alpha-O-4 linkage), and Phenethoxybenzene (beta-O-4 linkage), in a Phosphotungstic acid-Pt/C based fluidized ECH system. The ECH of three kinds of aryl ether dimers all afforded >90% of the corresponding hydrodeoxygenation products under the optimized conditions (80 degrees C and a current density of 25 mA cm(-2) within 90 min). It showed some difference in the reactivity of alpha-O-4, 4-O-5, and beta-O-4. The reaction rate of the C-O bond decreased in the order of alpha-O-4 > 4-O-5 > beta-O-4. The C-O bond of the alpha-O-4 and beta-O-4 linkages was mainly cleaved by hydrogenolysis and reductive hydrolysis, respectively. In comparison, the C-O bonds of 4-O-5 linkage were cleaved by parallel hydrogenolysis and reductive hydrolysis. This difference was mainly attributed to the reaction rate of the further hydrogenolysis of the Caliphaqe-OH fragment (produced by the hydrolysis of the alpha-O-4 and beta-O-4 linkages). While phenol (produced by hydrolysis of the 4-O-5 linkage) mainly generated cyclohexanol by hydrogenation pathway.