CobaltMaghrebV1, France, Analysis, bibRecord, 000221

Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations

Identifieur interne : 000221 ( France/Analysis ); précédent : 000220; suivant : 000222

Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations

Auteurs : Kaoutar Elkabouss [Maroc, France] ; Mohamed Kacimi [Maroc] ; Mahfoud Ziyad [Maroc] ; Souad Ammar [France] ; Francois Bozon-Verduraz [France]

Source :

Journal of catalysis : (Print) [ 0021-9517 ] ; 2004.

RBID : Pascal:04-0443422

Descripteurs français

Pascal (Inist)
- Cobalt, Apatite hydroxylée, Catalyseur, Butanol, Ethane, Oxydation, Déshydrogénation, Facteur réflexion, Susceptibilité magnétique, Spectrométrie photoélectron, Rayon X.
Wicri :
- topic : Cobalt.

English descriptors

KwdEn :
- Butanol, Catalyst, Cobalt, Dehydrogenation, Ethane, Hydroxyapatite, Magnetic susceptibility, Oxidation, Photoelectron spectrometry, Reflectance, X ray.

Abstract

A series of exchanged cobalt/calcium (Co²⁺/Ca²⁺) hydroxyapatite Ca_10-xCo_x (PO₄)₆(OH)₂ was synthesized and characterized by XRD, UV-visible-near-infrared (NIR) and IR spectroscopy, magnetic measurements (SQUID), and X-ray photoemission spectroscopy (XPS). The level of Co²⁺/Ca²⁺ exchange was limited to 1.35 wt% Co. After calcination in air at 550°C, cobalt was still present as Co²⁺ and all samples were paramagnetic, showing that the apatite matrix impedes the oxidation of Co²⁺ and that the Co²⁺ ions are isolated, whatever the Co content. Magnetic measurements and UV-visible diffuse reflectance spectra show that the exchanged Co²⁺ ions are hosted by two types of sites (with octahedral and trigonal prismatic symmetries). XPS confirmed the surface cobalt enrichment and did not reveal Co³⁺ ions. Dehydrogenation of 2-butanol leads almost exclusively to the formation of hutanone. As the Co content increases, the ketone yield passes through a maximum. In the oxidative dehydrogenation of ethane, the ethylene yield also reaches a maximum (22 mol%) for 0.96 wt% Co at 550°C. These results are ascribed to (i) the partial compensation of the intrinsic dehydrogenating activity of cobalt by the decrease in basicity of apatite induced by the replacement of Ca²⁺ by Co²⁺, and (ii) the involvement of two types of sites.

Affiliations:

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Pascal:04-0443422

Le document en format XML

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<author><name sortKey="Bozon Verduraz, Francois" sort="Bozon Verduraz, Francois" uniqKey="Bozon Verduraz F" first="Francois" last="Bozon-Verduraz">Francois Bozon-Verduraz</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations</title>
<author><name sortKey="Elkabouss, Kaoutar" sort="Elkabouss, Kaoutar" uniqKey="Elkabouss K" first="Kaoutar" last="Elkabouss">Kaoutar Elkabouss</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie.</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
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<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
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</affiliation>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu</s1>
<s2>75251 Paris</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Île-de-France</region>
<settlement type="city">Paris</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie.</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
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<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name>
<affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie.</s1>
<s2>Rabat</s2>
<s3>MAR</s3>
<sZ>1 aut.</sZ>
<sZ>2 aut.</sZ>
<sZ>3 aut.</sZ>
</inist:fA14>
<country>Maroc</country>
<placeName><settlement type="city">Rabat</settlement>
<region nuts="2">Rabat-Salé-Kénitra</region>
</placeName>
</affiliation>
</author>
<author><name sortKey="Ammar, Souad" sort="Ammar, Souad" uniqKey="Ammar S" first="Souad" last="Ammar">Souad Ammar</name>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu</s1>
<s2>75251 Paris</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Île-de-France</region>
<settlement type="city">Paris</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Bozon Verduraz, Francois" sort="Bozon Verduraz, Francois" uniqKey="Bozon Verduraz F" first="Francois" last="Bozon-Verduraz">Francois Bozon-Verduraz</name>
<affiliation wicri:level="3"><inist:fA14 i1="02"><s1>Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu</s1>
<s2>75251 Paris</s2>
<s3>FRA</s3>
<sZ>1 aut.</sZ>
<sZ>4 aut.</sZ>
<sZ>5 aut.</sZ>
</inist:fA14>
<country>France</country>
<placeName><region type="region" nuts="2">Île-de-France</region>
<settlement type="city">Paris</settlement>
</placeName>
</affiliation>
</author>
</analytic>
<series><title level="j" type="main">Journal of catalysis : (Print)</title>
<title level="j" type="abbreviated">J. catal. : (Print)</title>
<idno type="ISSN">0021-9517</idno>
<imprint><date when="2004">2004</date>
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</sourceDesc>
<seriesStmt><title level="j" type="main">Journal of catalysis : (Print)</title>
<title level="j" type="abbreviated">J. catal. : (Print)</title>
<idno type="ISSN">0021-9517</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Butanol</term>
<term>Catalyst</term>
<term>Cobalt</term>
<term>Dehydrogenation</term>
<term>Ethane</term>
<term>Hydroxyapatite</term>
<term>Magnetic susceptibility</term>
<term>Oxidation</term>
<term>Photoelectron spectrometry</term>
<term>Reflectance</term>
<term>X ray</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Cobalt</term>
<term>Apatite hydroxylée</term>
<term>Catalyseur</term>
<term>Butanol</term>
<term>Ethane</term>
<term>Oxydation</term>
<term>Déshydrogénation</term>
<term>Facteur réflexion</term>
<term>Susceptibilité magnétique</term>
<term>Spectrométrie photoélectron</term>
<term>Rayon X</term>
</keywords>
<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cobalt</term>
</keywords>
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<front><div type="abstract" xml:lang="en">A series of exchanged cobalt/calcium (Co<sup>2+</sup>
/Ca<sup>2+</sup>
) hydroxyapatite Ca<sub>10-x</sub>
Co<sub>x</sub>
 (PO<sub>4</sub>
)<sub>6</sub>
(OH)<sub>2</sub>
 was synthesized and characterized by XRD, UV-visible-near-infrared (NIR) and IR spectroscopy, magnetic measurements (SQUID), and X-ray photoemission spectroscopy (XPS). The level of Co<sup>2+</sup>
/Ca<sup>2+</sup>
 exchange was limited to 1.35 wt% Co. After calcination in air at 550°C, cobalt was still present as Co<sup>2+</sup>
 and all samples were paramagnetic, showing that the apatite matrix impedes the oxidation of Co<sup>2+</sup>
 and that the Co<sup>2+</sup>
 ions are isolated, whatever the Co content. Magnetic measurements and UV-visible diffuse reflectance spectra show that the exchanged Co<sup>2+</sup>
 ions are hosted by two types of sites (with octahedral and trigonal prismatic symmetries). XPS confirmed the surface cobalt enrichment and did not reveal Co<sup>3+</sup>
 ions. Dehydrogenation of 2-butanol leads almost exclusively to the formation of hutanone. As the Co content increases, the ketone yield passes through a maximum. In the oxidative dehydrogenation of ethane, the ethylene yield also reaches a maximum (22 mol%) for 0.96 wt% Co at 550°C. These results are ascribed to (i) the partial compensation of the intrinsic dehydrogenating activity of cobalt by the decrease in basicity of apatite induced by the replacement of Ca<sup>2+</sup>
 by Co<sup>2+</sup>
, and (ii) the involvement of two types of sites.</div>
</front>
</TEI>
<affiliations><list><country><li>France</li>
<li>Maroc</li>
</country>
<region><li>Rabat-Salé-Kénitra</li>
<li>Île-de-France</li>
</region>
<settlement><li>Paris</li>
<li>Rabat</li>
</settlement>
</list>
<tree><country name="Maroc"><region name="Rabat-Salé-Kénitra"><name sortKey="Elkabouss, Kaoutar" sort="Elkabouss, Kaoutar" uniqKey="Elkabouss K" first="Kaoutar" last="Elkabouss">Kaoutar Elkabouss</name>
</region>
<name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name>
<name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name>
</country>
<country name="France"><region name="Île-de-France"><name sortKey="Elkabouss, Kaoutar" sort="Elkabouss, Kaoutar" uniqKey="Elkabouss K" first="Kaoutar" last="Elkabouss">Kaoutar Elkabouss</name>
</region>
<name sortKey="Ammar, Souad" sort="Ammar, Souad" uniqKey="Ammar S" first="Souad" last="Ammar">Souad Ammar</name>
<name sortKey="Bozon Verduraz, Francois" sort="Bozon Verduraz, Francois" uniqKey="Bozon Verduraz F" first="Francois" last="Bozon-Verduraz">Francois Bozon-Verduraz</name>
</country>
</tree>
</affiliations>
</record>

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Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations

Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Links to Exploration step

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri