Preparation and characterization of copper-thorium oxide catalysts. 1. Solid solution of copper(II) in thoria: An ESR study
- Universite des Sciences et Techniques de Lille Flandres-Artois, Villeneuve d'Ascq (France)
- Universite Libanaise (France)
Copper-thorium oxide catalysts prepared with an atomic ratio Cu/Th < 0.01 by coprecipitation of the hydroxides and calcination under dried air up to 1,073 K were mainly studied by electron spin resonance (ESR). These systems behave as a solid solution, with the thoria structure. ESR studies evidenced two well-resolved signals, A{sub 1} and A{sub 2}. A complete simulation of these signals was carried out by taking into consideration the presence of both copper isotopes {sup 63}Cu and {sup 65}Cu. It has been shown that copper is localized in the thoria structure as isolated Cu{sup 2+} ions, probably both in interstitial and substitutional sites. Then 8-fold coordination has been suggested for both Cu{sup 2+} ions sites. In the thoria lattice, such an environment seems more probable than an octahedral symmetry.
- OSTI ID:
- 5480701
- Journal Information:
- Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 2:5; ISSN CMATE; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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ACTINIDE COMPOUNDS
CATALYSTS
CHALCOGENIDES
CHEMICAL PREPARATION
COPPER COMPOUNDS
COPPER OXIDES
DATA
DISPERSIONS
ELECTRON SPIN RESONANCE
EXPERIMENTAL DATA
INFORMATION
MAGNETIC RESONANCE
MEASURING METHODS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
RESONANCE
SOLID SOLUTIONS
SOLUTIONS
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS
THORIUM COMPOUNDS
THORIUM OXIDES
TRANSITION ELEMENT COMPOUNDS