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

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 Cu 2+ ions have been detected in CeO 2 after different calcination temperatures. Monomers and dimers are located...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 1996-08, Vol.115 (1-3), p.171-177
Main Authors: Aboukaïs, Antoine, Bennani, Abdelrhani, Lamonier-Dulongpont, Carole, Abi-Aad, Edmond, Wrobel, Geneviève
Format: Article
Language:English
Subjects:
Catalysis
Catalysts: preparations and properties
Chemistry
Copper(II) species
CuCe oxide catalysts
Electron paramagnetic resonance
Exact sciences and technology
General and physical chemistry
Redox behaviour
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary: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 Cu 2+ ions have been detected in CeO 2 after different calcination temperatures. Monomers and dimers are located in specific and similar sites of the ceria lattice in place of Ce 4+ ions. When two Cu 2+ 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 Cu 0 species in a second step.
ISSN:0927-7757
1873-4359
DOI:10.1016/0927-7757(96)03655-2