Influence of preparation method on catalytic properties of mixed calcium-cobalt orthophosphates
Identifieur interne : 000355 ( PascalFrancis/Curation ); précédent : 000354; suivant : 000356Influence 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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<series><title level="j" type="main">Journal of materials science</title>
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<keywords scheme="Pascal" xml:lang="fr"><term>Activité catalytique</term>
<term>Préparation</term>
<term>Coprécipitation</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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<sZ>1 aut.</sZ>
</fA14>
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<sZ>3 aut.</sZ>
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<fC01 i1="01" l="ENG"><s0>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.</s0>
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<s5>01</s5>
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<s5>02</s5>
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<s5>02</s5>
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<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Preparación</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Coprécipitation</s0>
<s5>04</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Coprecipitation</s0>
<s5>04</s5>
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<s5>04</s5>
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<s5>13</s5>
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<s2>NA</s2>
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<s5>14</s5>
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<s2>FR</s2>
<s2>NA</s2>
<s5>14</s5>
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<fC03 i1="06" i2="X" l="FRE"><s0>Ca3-xCox(PO4)2</s0>
<s4>INC</s4>
<s5>75</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>C Ca O P</s0>
<s4>INC</s4>
<s5>76</s5>
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<fN21><s1>190</s1>
</fN21>
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