Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Identifieur interne : 001136 ( Main/Merge ); précédent : 001135; suivant : 001137Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Auteurs : A. Legrouri [Maroc] ; S. S. Romdhane ; J. Lenzi [France] ; M. Lenzi [France] ; G. Bonel [France]Source :
- Journal of materials science [ 0022-2461 ] ; 1996.
Descripteurs français
- Pascal (Inist)
English descriptors
Abstract
Mixed calcium-cobalt orthophosphates of the formula Ca3-xCOx(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 to x = 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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Pascal:96-0276914Le document en format XML
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<series><title level="j" type="main">Journal of materials science</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Calcium Phosphates</term>
<term>Catalyst activity</term>
<term>Cobalt Phosphates</term>
<term>Coprecipitation</term>
<term>Preparation</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Activité catalytique</term>
<term>Préparation</term>
<term>Coprécipitation</term>
<term>Cobalt Phosphate</term>
<term>Calcium Phosphate</term>
<term>Ca3-xCox(PO4)2</term>
<term>C Ca O P</term>
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<front><div type="abstract" xml:lang="en">Mixed calcium-cobalt orthophosphates of the formula Ca<sub>3-x</sub>
CO<sub>x</sub>
(PO<sub>4</sub>
)<sub>2</sub>
, 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 Ca<sup>2+</sup>
ions by Co<sup>2+</sup>
ions in the β-Ca<sub>3</sub>
(PO<sub>4</sub>
)<sub>2</sub>
structure. The solubility limit of cobalt in this structure corresponded to x = 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-Ca<sub>3</sub>
(PO<sub>4</sub>
)<sub>2</sub>
structure. Higher activities were obtained for samples prepared by coprecipitation.</div>
</front>
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