文献类型：期刊文献

英文题名：Studies of the Catalytic Oxidation of CO Over Ag/CeO₂ Catalyst

作者：Kang, Yan[1];Sun, Min[2];Li, Aimin[3]

机构：[1]E China Univ Sci & Technol, Res Ctr Anal & Test, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Res Inst Ind Catalysis, Adv Mat Lab, Shanghai 200237, Peoples R China;[3]Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 200050, Peoples R China

年份：2012

卷号：142

期号：12

起止页码：1498

外文期刊名：CATALYSIS LETTERS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000312060700010)】；

基金：This work was financially supported by Research Center of Analysis and Test of East China University of Science and Technology. The authors are grateful to Dr. J. X. Li, L. H. Zhou, Y. Q. Song and Professor Y. P. Du for helpful discussions.

语种：英文

外文关键词：CO oxidation; Ag/CeO2; Oxygen vacancy; Raman

摘要：CO oxidation was investigated over Ag/CeO2 and CeO2 catalysts prepared by sol-gel method in this work. The catalytic activity of Ag/CeO2 was higher than pure CeO2. The chemico-physical properties of catalysts were characterized by XRD, TEM, XPS, H-2-TPR and Raman spectroscopy. The characterization results indicated that a part of silver was inserted into the lattice of CeO2 and aroused the expansion of lattice. Raman studies of Ag/CeO2 demonstrated that the concentration of oxygen vacancies greatly increased at 5 vol.% CO/N-2 atmosphere and gradually decreased at O-2 atmosphere with the rising temperature from 30 to 300 A degrees C respectively. However, a different behavior was observed over pure CeO2. The obtained Raman results showed that the oxygen storage capability of Ag/CeO2 was superior to that of CeO2 and larger amount of lattice oxygen of the former took part in the oxidation reaction evidenced by changes of oxygen vacancy. On the basis of characterization data, it was proposed that the introduction of Ag into CeO2 facilitated the activation of lattice oxygen and formation of oxygen vacancies. These features may be responsible for the higher catalytic activity of Ag/CeO2 for CO oxidation.