文献类型：期刊文献

英文题名：Catalytic total oxidation of 1,2-dichloroethane over highly dispersed vanadia supported on CeO2 nanobelts

作者：Dai, Qiguang[1];Bai, Shuxing[1];Li, Hua[2];Liu, Wei[2];Wang, Xingyi[1];Lu, Guanzhong[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[2]Chinese Acad Sci, Shanghai Inst Appl Phys, Key Lab Nucl Radiat & Nucl Energy Technol, Shanghai 201800, Peoples R China

年份：2015

卷号：168

起止页码：141

外文期刊名：APPLIED CATALYSIS B-ENVIRONMENTAL

收录：;EI(收录号：20150100403100);WOS:【SCI-EXPANDED(收录号:WOS:000352747200017)】；

基金：The authors would like to thank Dr. Wei Deng for English language editing. This research was supported by the National Natural Science Foundation of China (Nos. 21307033, 21277047), Shanghai Natural Science Foundation (No. 13ZR1411000), National Basic Research Program of China (Nos. 2010CB732300, 2011AA03A406), Commission of Science and Technology of Shanghai Municipality (No. 11JC1402900), Development Program for Young Teachers in Shanghai Universities and the Opening Project of Key Laboratory of Nuclear Radiation and Nuclear Energy Technology, Chinese Academy of Sciences (NRNE-OP2012001).

语种：英文

外文关键词：1,2-Dichloroethane; Total oxidation; Vanadia; CeO2; Reaction mechanism

摘要：CeO2 nanobelts were synthesized via a facile aqueous-phase precipitation route under mild conditions (template-free and non-hydrothermal), and then the highly dispersed vanadia catalysts with a wide range of VOx loadings were prepared by a conventional incipient-wetness impregnation method. The target VOx/CeO2 catalysts were characterized in detail and used in catalytic combustion of 1,2-dichloroethane (DCE). The results revealed that the monolayer dispersed VOx (6.0%VOx/CeO2) exhibited the most outstanding initial and stable activities, however, the main product containing carbon was CO2 not desired CO2. A reaction mechanism of DCE total oxidation was proposed based on the study of TPSR and in situ FTIR. The first step of this mechanism was considered to be a dissociative adsorption of C-Cl bonds on Lewis acid sites (such as Ce4+/3+, V5+/4+ or Ce3+-O2--V5+) via Cl abstraction, and then the dissociated DCE can be oxidized directly to CO2 by surface active oxygen species over pure CeO2. Whereas, over VOx/CeO2 catalysts, the formation of intermediate acetaldehyde was a key step via C-H bond activation and hydrogen transfer on VOx species, subsequently, partially oxidized to CO by the lattice oxygen of VOx. (C) 2014 Elsevier B.V. All rights reserved,