crucial role in the oxidation of Cα–OH into CαO, which was the rate-determining step for the whole oxidative cleavage process. Further insight revealed that the cooperative effect between Au–Pd nanoparticles and the supportcovalenttriazineframeworks (CTFs) facilitated the cleavage of the formed β-O-4 ketone compound to the corresponding aromatics. In addition, Au–Pd-CTF catalysts also showed efficiency
Promoting Lignin Depolymerization and Restraining the Condensation via an Oxidation−Hydrogenation Strategy
作者:Chaofeng Zhang、Hongji Li、Jianmin Lu、Xiaochen Zhang、Katherine E. MacArthur、Marc Heggen、Feng Wang
DOI:10.1021/acscatal.7b00148
日期:2017.5.5
structures are further hydrogenated over a NiMo sulfide catalyst, leading to the cleavage of Cβ–OPh and Cα–OPh bonds. Besides the transformation of lignin model compounds, the yield of phenolicmonomers from birch wood is up to 32% by using this two-step strategy. The preoxidation of CαH–OH to Cα═O not only weakens the Cβ–OPh ether bond but also avoids the condensation reactions caused by the presence of Cα+
Efficient cleavage of aryl ether C–O linkages by Rh–Ni and Ru–Ni nanoscale catalysts operating in water
作者:Safak Bulut、Sviatlana Siankevich、Antoine P. van Muyden、Duncan T. L. Alexander、Georgios Savoglidis、Jiaguang Zhang、Vassily Hatzimanikatis、Ning Yan、Paul J. Dyson
DOI:10.1039/c8sc00742j
日期:——
Rh–Ni and Ru–Ni nanocatalysts efficiently catalyze the hydrogenolysis of C–O bonds under mild operating conditions in water.
Rh-Ni和Ru-Ni纳米催化剂在水中的温和操作条件下有效催化C-O键的氢解反应。
A Metal-Free, Carbon-Based Catalytic System for the Oxidation of Lignin Model Compounds and Lignin
作者:Yongjun Gao、Jiaguang Zhang、Xi Chen、Ding Ma、Ning Yan
DOI:10.1002/cplu.201300439
日期:2014.6
Nitrogen‐containing graphene material (LCN) has been identified as an effective catalyst for the oxidation of β‐O‐4 and α‐O‐4 types of ligninmodelcompounds in the presence of tert‐butyl hydroperoxide, to provide aromatic aldehydes, acids and other organic chemicals in high yield. The transformations of five ligninmodelcompounds over LCN were investigated systematically. Instrumentation analysis, kinetic study
The selective hydrogenolysis of C–O bonds in lignin model compounds by Pd–Ni bimetallic nanoparticles in ionic liquids
作者:Kang-kang Sun、Guo-ping Lu、Jia-wei Zhang、Chun Cai
DOI:10.1039/c7dt02498c
日期:——
bimetallic nanoparticles in ionic liquids using hydrogen gas as the hydrogen donor under ambient pressure and neutral conditions. No hydrogenation of benzene ring takes place in the catalyticsystem. A obvious improvement in activity is found compared with single nickel and palladium catalysts based on the results of experiments and characterization. After the reaction, the catalyticsystem still stays