Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Identifieur interne : 000029 ( Istex/Curation ); précédent : 000028; suivant : 000030Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Auteurs : A. Legrouri [Maroc] ; S. S. Romdhane [Tunisie] ; J. Lenzi [France] ; M. Lenzi [France] ; G. Bonel [France]Source :
- Journal of Materials Science [ 0022-2461 ] ; 1996-05-01.
Abstract
Abstract: Mixed calcium-cobalt orthophosphates of the formula Ca3−x COx(PO4)2, with 0 ⩽x ⩽ 1.1, were prepared by coprecipitation and solid-state reaction. Structural characterization showed that, in both cases, the solids obtained resulted from substitution of some Ca2+ ions by Co2+ ions in the β-Ca3(PO4)2 structure. The solubility limit of cobalt in this structure corresponded tox=0.31. The morphology of these compounds was investigated by surface-area measurements and scanning electron microscopy. When tested in the 2-propanol decomposition reaction, the maximum activity in dehydrogenation was obtained with the compound corresponding to cobalt maximum solubility in β-Ca3(PO4)2 structure. Higher activities were obtained for samples prepared by coprecipitation.
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DOI: 10.1007/BF01152963
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<front><div type="abstract" xml:lang="en">Abstract: Mixed calcium-cobalt orthophosphates of the formula Ca3−x COx(PO4)2, with 0 ⩽x ⩽ 1.1, were prepared by coprecipitation and solid-state reaction. Structural characterization showed that, in both cases, the solids obtained resulted from substitution of some Ca2+ ions by Co2+ ions in the β-Ca3(PO4)2 structure. The solubility limit of cobalt in this structure corresponded tox=0.31. The morphology of these compounds was investigated by surface-area measurements and scanning electron microscopy. When tested in the 2-propanol decomposition reaction, the maximum activity in dehydrogenation was obtained with the compound corresponding to cobalt maximum solubility in β-Ca3(PO4)2 structure. Higher activities were obtained for samples prepared by coprecipitation.</div>
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