Preparation and characterization of nanostructured Ce_0.9Cu_0.1O_2−δ solid solution with high surface area and its application for low temperature CO oxidation

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• 作者：Meng-Fei Luo ; Yu-Peng Song ; Xiang-Yu Wang ; Guan-Qun Xie ; Zhi-Ying Pu ; Ping Fang ; Yun-Long Xie
• 关键词：Ce_0.9Cu_0.1O₂₋ ; δ ; solid solution ; Sol– ; gel method ; Nanostructure ; High surface area ; CO oxidation
• 刊名：Catalysis Communications
• 出版年：2007
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：May 2007
• 卷：8
• 期：5
• 页码：834-838
• 文件大小：176 K

摘要

Nanostructured Ce_0.9Cu_0.1O_2−δ solid solution with high surface area was prepared by improved citrate sol–gel method with incorporation of thermal treatment under N₂. The sample was characterized by TG–DSC, BET nitrogen adsorption, XRD and H₂-TPR. Its catalytic activity for CO oxidation was tested. It was found that the improved method offered catalysts with higher surface area and smaller crystallite size, which led to higher catalytic activity for low temperature CO oxidation. H₂-TPR measurement indicated that there were three CuO species in the Ce_0.9Cu_0.1O_2−δ solid solutions: finely dispersed CuO species on the surface of CeO₂, partial Cu²⁺ penetrated into CeO₂ lattice and bulk CuO phase. The finely dispersed CuO species was regarded as the active site for the low temperature CO oxidation.