Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Identifieur interne : 000213 ( Maroc/Analysis ); précédent : 000212; suivant : 000214Influence 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.
Descripteurs français
- Pascal (Inist)
English descriptors
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.
Url:
DOI: 10.1007/BF01152963
Affiliations:
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ISTEX:A6BFB672B54B637CDAB9EE41BC82BFBACA18EE5ALe document en format XML
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Bonel</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Physicochimie des Solides, 38, Rue des 36-Ponts, 31400, Toulouse</wicri:regionArea><placeName><region type="region" nuts="2">Occitanie (région administrative)</region><region type="old region" nuts="2">Midi-Pyrénées</region><settlement type="city">Toulouse</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Materials Science</title><title level="j" type="abbrev">J Mater Sci</title><idno type="ISSN">0022-2461</idno><idno type="eISSN">1573-4803</idno><imprint><publisher>Kluwer Academic Publishers</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1996-05-01">1996-05-01</date><biblScope unit="volume">31</biblScope><biblScope unit="issue">9</biblScope><biblScope unit="page" from="2469">2469</biblScope><biblScope unit="page" to="2473">2473</biblScope></imprint><idno type="ISSN">0022-2461</idno></series><idno type="istex">A6BFB672B54B637CDAB9EE41BC82BFBACA18EE5A</idno><idno type="DOI">10.1007/BF01152963</idno><idno type="ArticleID">BF01152963</idno><idno type="ArticleID">Art33</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-2461</idno></seriesStmt></fileDesc><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>C Ca O P</term><term>Ca3-xCox(PO4)2</term><term>Calcium Phosphate</term><term>Cobalt Phosphate</term><term>Coprécipitation</term><term>Préparation</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><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></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li><li>Tunisie</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><country name="Maroc"><noRegion><name sortKey="Legrouri, A" sort="Legrouri, A" uniqKey="Legrouri A" first="A." last="Legrouri">A. 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