文献类型：期刊文献

英文题名：Catalytic performance of La-Ce-O mixed oxide for combustion of methane

作者：Zhang, Bo[1];Li, Dao[1];Wang, Xingyi[1]

机构：[1]E China Univ Sci & Technol, Res Inst Ind Catalysis, Adv Mat Lab, Shanghai 200237, Peoples R China

年份：2010

卷号：158

期号：3-4

起止页码：348

外文期刊名：CATALYSIS TODAY

收录：;EI(收录号：20104813434944);WOS:【SCI-EXPANDED(收录号:WOS:000284583300026)】；

基金：We would like to acknowledge the financial support from National Basic Research Program of China (No. 2010CB732300), National Natural Science Foundation of China (No. 20977029) and the Commission of Science and Technology of Shanghai Municipality (0852nm00900).

语种：英文

外文关键词：Catalytic combustion; Methane; Ceria; Lanthanum; Solid solution

摘要：A series of Ce-La-O mixed oxide catalysts with different compositions have been prepared by sol-gel method and characterized by XRD, BET, Raman, TPR and CO(2)-TPD techniques. The activity of Ce-La-O catalysts for methane oxidation has been investigated. When the ratio of Ce/Ce + La is changed from 1.0 to 0.2, only cubic phase CeO(2) with fluorite structure is observed, whose crystal size decreases significantly with the increase in La amount, due to the formation of LaCeO(x) solid solution. The peak at 533 degrees C on TPR profiles of Ce-La-O with fluorite structure is ascribed to the reduction of non-stoichiometric CeO(2-x). Raman bands around 570 and 1167 cm(-1) for samples with the Ce/Ce + La ratios of 1-0.2 might be assigned to oxygen vacancies and surface superoxide ions, respectively. The addition of La promotes the formation of non-stoichiometric CeO(2-x), which is responsible for the oxygen vacancies and surface superoxide ions. However, when the ratio of Ce/Ce + La decreases to 0.2, ceria-in-lanthanum solid solutions are formed, where non-stoichiometric CeO(2-x) cannot be observed. The high activity of Ce-La-O mixed oxide catalyst for methane combustion is related to superoxide ions and surface reducibility. (C) 2010 Published by Elsevier B.V.