Redox behaviour of copper(II) species on CuCe oxide catalysts: electron paramagnetic resonance (EPR) study
Redox behaviour of copper(II) species on CuCe oxide catalysts: electron paramagnetic resonance (EPR) study
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DOI：
10.1016/0927-7757(96)03655-2
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发表时间：
1996-08
期刊：
影响因子：
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通讯作者：
A. Aboukaïs;A. Bennani;Carole Lamonier-Dulongpont;E. Abi-aad;G. Wrobel
中科院分区：
文献类型：
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作者：
A. Aboukaïs;A. Bennani;Carole Lamonier-Dulongpont;E. Abi-aad;G. Wrobel
电子顺磁共振（EPR）已用于研究空气或氢气下热处理对 CuCe 氧化物催化剂行为的影响。在不同的煅烧温度后，CeO2 中检测到了单体、二聚体和 Cu2+ 离子簇。单体和二聚体位于二氧化铈晶格的特定且相似的位置，代替 Ce4+ 离子。当两个 Cu2+ 离子距离为 3.6 ± 0.3 Å 并通过氧桥接时，就会形成二聚体信号。二聚体被氢还原，第一步产生单体，第二步转化为 Cu− 或 Cu0 物质。
Electron paramagnetic resonance (EPR) has been used to study the effect of heat treatment under air or hydrogen on the behaviour of CuCe oxide catalysts. Monomers, dimers and clusters of Cu2+ions have been detected in CeO2after 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 Å 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 Cu0species in a second step.