文献类型：期刊文献

英文题名：Cotton Fiber-Anchored Nb Single-Site Catalyst for Selective Oxidation of Anilines to Azoxybenzenes

作者：Ding, Bingjie[1]; Jiang, Yongjun[2]; Xu, Beibei[3]; Dai, Sheng[2]; Gong, Honghui[1]; Zhao, Xiuge[1]; Yao, Yefeng[3]; An, Pengfei[4]; Hou, Zhenshan[1,5]

机构：[1] Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China; [2] Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry & Molecular Engineering East China University of Science and Technology, Shanghai, 200237, China; [3] Physics Department, Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai, 200062, China; [4] Institute of High Energy Physics, Chinese Academy of Sciences, Beijing Synchrotron Radiation Facility [BSRF], Beijing, 100049, China; [5] Shanghai Key Laboratory of Green Chemistry and Chemical Processes, East China Normal University, School of Chemistry and Molecular Engineering, Shanghai, 200062, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220447996)

语种：英文

外文关键词：Carboxylic acids - Catalyst activity - Catalytic oxidation - Cotton - Cotton fibers - Nuclear magnetic resonance spectroscopy

摘要：This work demonstrated a facile methodology to construct single Nb site catalysts with merely 0.63 wt% Nb by employing α-hydroxy carboxylic acid-functionalized cotton fiber as green and sustainable supporting material. The as-synthesized catalysts exhibited a superior catalytic activity for selective oxidation of aniline into azoxybenzene under mild and green conditions, demonstrating the highest TOF (4806 h-1) among the reported heterogeneous catalysts. Moreover, the catalyst has steadily been operated under continuous-flow conditions. The activity test and catalyst characterization indicated that the atomically dispersed Nb-peroxo coordination centers were actually catalytic sites. Moreover, 1H MAS NMR spectra verified that there exists an acid-base interaction between arylamines and free α-hydroxy carboxylic acid groups covalently grafted on cotton fiber, which was favorable for adsorption and activation of the substrates. The work provides an economical and environmentally friendly approach to construct single–site catalysts for the oxidation reaction. ? 2022, The Authors. All rights reserved.