The relationship of morphology and catalytic performance of CeO_(2) catalysts for reducing nitrobenzene to azoxybenzene under the base-free condition  

作　　者：Xueke Zhou Haitao Zhao Shaojun Liu Yang Yang Ruiyang Qu Chenghang Zhen Xiang Gao 

机构地区：[1]Stare Key Lab of Clean Energy Utilization,State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control,Zhejiang University,Hangzhou 310027,China

出　　处：《Chinese Chemical Letters》2021年第2期761-764,共4页中国化学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51836006,U1609212);Key Research and Development Project of Shandong Province (No.2019JZZY010403)。

摘　　要：CeO_(2) morphology was proposed to be a crucial factor for reducing nitrobenzene to azoxybenzene under the base-free condition.Herein,the structure-activity relationship of CeO_(2) catalysts was explored to improve the azoxybenzene yield.A series of CeO_(2) catalysts we re synthesized with seven morphologies to obtain different Ce^(3+) proportion and various surface areas.Notably,the catalytic performance of these samples for reducing nitrobenzene to azoxybenzene enhanced with the increasing Ce^(3+) proportio n.With the highest surface Ce^(3+) proportion,the Rod-CeO_(2) catalyst exhibited 100% conversion of nitrobenzene and 89.8% azoxybenzene selectivity in 7 h at 150℃ under 1 MPa CO.Moreover,the preliminary mechanistic analysis indicated that the inhabitation of azoxybenzene to by-product azobenzene resulted in the high selectivity of azoxybenzene.

关 键 词：Ceria catalyst Ce^(3+)proportion NITROBENZENE AZOXYBENZENE Base-free 

分 类 号：TQ241[化学工程—有机化工] TQ426