Redox interplay at copper oxide-(Ce, Zr)Ox interfaces:: influence of the presence of NO on the catalytic activity for CO oxidation over CuO/CeZrO4

被引:83
作者
Martínez-Arias, A
Fernández-García, M
Hungría, AB
Iglesias-Juez, A
Gálvez, O
Anderson, JA
Conesa, JC
Soria, J
Munuera, G
机构
[1] CSIC, Inst Catalisis & Petr Quim, E-28049 Madrid, Spain
[2] Univ Dundee, Div Phys & Inorgan Chem, Dundee DD1 4HN, Scotland
[3] Univ Sevilla, Dept Quim Inorgan, Seville 41092, Spain
关键词
copper oxide; Ce-Zr mixed oxide; ceria-based catalysts; CO oxidation; nitric oxide; XPS; Cu2+ EPR; NO adsorption infrared; in situ DRIFTS;
D O I
10.1016/S0021-9517(02)00084-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A catalyst composed of copper oxide supported on cerium-zirconium mixed oxide (CuOx/CeZrO4) has been studied with respect to its activity for CO oxidation under stoichiometric conditions employing either oxygen or oxygen with a small amount of NO as oxidant. The nature of copper oxide entities, as well as the redox properties of the catalyst following interactions with CO and O-2-NO, has been studied by XPS, EPR, and static NO adsorption infrared spectroscopy while in situ DRIFIFS has been employed to follow processes occurring at the catalyst surface under reaction conditions. Characterization of the copper oxide species in both fully oxidized and partially reduced states reveals that they are significantly affected by interactions with the underlying support. On the basis of catalytic activity results and in combination with analysis of the evolution of particular Cu+ carbonyls, comparing the CO oxidation reaction in the presence and absence of NO, it is proposed that the two basic factors affecting the catalytic performance of this type of system are the facility for achieving a partially reduced state for the copper oxide phase at the interfacial zone and the redox properties of the CuOx/CeZrO4 interface. (C) 2003 Elsevier Science (USA). All rights reserved.
引用
收藏
页码:261 / 272
页数:12
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