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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Lenzi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Centre de Génie Photochimique, Ecole Nationale Supérieure de Chimie, 118, Route de Narbornne</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><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><author><name sortKey="Lenzi, M" sort="Lenzi, M" uniqKey="Lenzi M" first="M." last="Lenzi">M. Lenzi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Centre de Génie Photochimique, Ecole Nationale Supérieure de Chimie, 118, Route de Narbornne</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><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><author><name sortKey="Bonel, G" sort="Bonel, G" uniqKey="Bonel G" first="G." last="Bonel">G. 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Legrouri</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>School of Science and Engineering, Al Akhawayn University, P.O. Box 104</s1><s2>5300 Ifrane</s2><s3>MAR</s3><sZ>1 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>5300 Ifrane</wicri:noRegion></affiliation></author><author><name sortKey="Romdhane, S S" sort="Romdhane, S S" uniqKey="Romdhane S" first="S. S." last="Romdhane">S. S. Romdhane</name></author><author><name sortKey="Lenzi, J" sort="Lenzi, J" uniqKey="Lenzi J" first="J." last="Lenzi">J. Lenzi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Centre de Génie Photochimique, Ecole Nationale Supérieure de Chimie, 118, Route de Narbornne</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><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><author><name sortKey="Lenzi, M" sort="Lenzi, M" uniqKey="Lenzi M" first="M." last="Lenzi">M. Lenzi</name><affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Centre de Génie Photochimique, Ecole Nationale Supérieure de Chimie, 118, Route de Narbornne</s1><s2>31077 Toulouse</s2><s3>FRA</s3><sZ>3 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>France</country><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><author><name sortKey="Bonel, G" sort="Bonel, G" uniqKey="Bonel G" first="G." last="Bonel">G. Bonel</name><affiliation wicri:level="3"><inist:fA14 i1="03"><s1>Laboratoire de Physicochimie des Solides, 38, Rue dees 36-Ponts</s1><s2>31400 Toulouse</s2><s3>FRA</s3><sZ>5 aut.</sZ></inist:fA14><country>France</country><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><series><title level="j" type="main">Journal of materials science</title><title level="j" type="abbreviated">J. mater. sci.</title><idno type="ISSN">0022-2461</idno><imprint><date when="1996">1996</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of materials science</title><title level="j" type="abbreviated">J. mater. sci.</title><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>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></keywords></textClass></profileDesc></teiHeader><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></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Toulouse</li></settlement></list><tree><noCountry><name sortKey="Romdhane, S S" sort="Romdhane, S S" uniqKey="Romdhane S" first="S. S." last="Romdhane">S. S. Romdhane</name></noCountry><country name="Maroc"><noRegion><name sortKey="Legrouri, A" sort="Legrouri, A" uniqKey="Legrouri A" first="A." last="Legrouri">A. Legrouri</name></noRegion></country><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Lenzi, J" sort="Lenzi, J" uniqKey="Lenzi J" first="J." last="Lenzi">J. Lenzi</name></region><name sortKey="Bonel, G" sort="Bonel, G" uniqKey="Bonel G" first="G." last="Bonel">G. Bonel</name><name sortKey="Lenzi, M" sort="Lenzi, M" uniqKey="Lenzi M" first="M." last="Lenzi">M. 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