文献类型：期刊文献

英文题名：Crystal-Facet-Dependent Activity and N2 Selectivity of Ag/Ceo2 Catalysts for Catalytic Oxidation of N, N-Dimethylformamide

作者：Guo, Yanglong[1]; Guo, Xiaohan[1]; Dong, Chenxiao[1]; Gao, Meixingzi[1]; Ye, Dongsheng[1]; Dai, Vista[1]; Zhan, Wangcheng[1]; Wang, Li[1]; Wang, Aiyong[1]; Guo, Yun[1]

机构：[1] State Key Laboratory of Green Chemical Engineering and Industrial Catalysis, Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2023

外文期刊名：SSRN

收录：EI(收录号：20230229820)

语种：英文

外文关键词：Carbon dioxide - Catalyst activity - Catalyst selectivity - Cerium oxide - Dimethylformamide - Morphology - Nanorods - Organic solvents - Oxygen vacancies - Silver - Surface reactions

摘要：Shape-controlled CeO2 with different exposed crystal facets, CeO2 nanorods (110) and (100), nanocubes (100) and nano-octahedrons (111), were prepared as supports of Ag and then the catalytic oxidation of N, N-dimethylformamide (DMF) was investigated. Ag/CeO2 nanorod (Ag/r-Ce) catalyst exhibits better dispersion of Ag species due to the abundant oxygen vacancies of CeO2 (110) with outstanding anchoring effect, meanwhile, more Ag-O-Ce interfaces and Ag+ species are achieved because of strong metal-support interaction and easy migration of oxygen species between Ag and CeO2 (110). Ag/r-Ce catalyst exhibits excellent catalytic activity (T90=158°C) and stability, high selectivity of CO2 and N2, unexceptionable H2O-resistance. Dissociation of (O)C-N bond is firstly involved in DMF oxidation, then the stepwise and repeated dehydrogenation of -N(CH3)2 and the insertion reaction of surface lattice oxygen occurs. Meanwhile the formed -HCO is completely oxidized into CO2 and H2O by surface adsorbed oxygen species and two adjacent -NH2 species combines into N2. ? 2023, The Authors. All rights reserved.