Redox behaviour of copper(II) species on CuCe oxide catalysts: Electron paramagnetic resonance (EPR) study

被引：44
|
作者：
Aboukais, A [1 ]
Bennani, A [1 ]
LamonierDulongpont, C [1 ]
AbiAad, E [1 ]
Wrobel, G [1 ]
机构：
[1] UNIV SCI & TECH LILLE FLANDRES ARTOIS,URA CNRS 402,CATALYSE HETEROGENE & HOMOGENE LAB,F-59655 VILLENEUVE DASCQ,FRANCE
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 1996年 / 115卷
关键词：
CuCe oxide catalysts; electron paramagnetic resonance; redox behaviour; copper(II) species;
D O I：
10.1016/0927-7757(96)03655-2
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：
Electron paramagnetic resonance (EPR) has been used to study the effect of hear treatment under air or hydrogen on the behaviour of CuCe oxide catalysts. Monomers, dimers and clusters of Cu2+ ions have been detected in CeO2 after different calcination temperatures. Monomers and dimers are located in specific and similar sites of the ceria lattice in place of Ce4+ ions. When two Cu2+ ions are situated at a distance of 3.6 +/- 0.3 Angstrom and bridged by an oxygen, the dimer signal is formed. The reduction of dimers by hydrogen gives monomers in a first step and these transform into Cu+ or Cu-0 species in a second step.
引用
收藏
页码：171 / 177
页数：7
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