文献类型：期刊文献

英文题名：A DFT plus U study of the lattice oxygen reactivity toward direct CO oxidation on the CeO₂(111) and (110) surfaces

作者：Chen, Fendy;Liu, Di;Zhang, Jie;Hu, P.;Gong, Xue-Qing[1];Lu, Guanzhong

机构：[1]E China Univ Sci & Technol, Labs Adv Mat, Ctr Computat Chem, Shanghai 200237, Peoples R China; E China Univ Sci & Technol, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2012

卷号：14

期号：48

起止页码：16573

外文期刊名：PHYSICAL CHEMISTRY CHEMICAL PHYSICS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000311735700008)】；

基金：The authors are thankful for the financial support from National Basic Research Program (2010CB732300, 2011CB808505), National Natural Science Foundation of China (21073060) and National High Technology Research and Development Program of China (2011AA03A406). X. Q. G. thanks Shanghai Institutions of Higher Learning for the program for professor of special appointment (Eastern Scholar), and P. H. thanks the Chinese Government for the program of "Thousands Talents".

语种：英文

摘要：Density functional theory calculations corrected by on-site Coulomb interaction have been carried out to track down the lattice oxygen reactivity of CeO2(111) and (110) surfaces in direct oxidation of a single CO. The possible elementary steps in CO adsorption and subsequent reactions with lattice oxygen were systematically studied. From calculated energetics, we determined that the lattice oxygen of the (110) surface is more reactive than that of the (111) surface. By calculating the reaction pathways leading to different final products, we found that the formation of carbonate species is competitive to CO2 formation and desorption, and such an effect could be more significant at CeO2(110) compared to CeO2(111). More importantly, it has also been found that electron localization at the characteristic 4f orbital of Ce, directly determined by subtle structural relaxation, can give rise to a unique scenario of the overall reaction coordinates. These results may bring us one step ahead toward the comprehensive understanding of catalytic performance of CeO2-based materials.