CobaltMaghrebV1, PascalFrancis, Corpus, bibRecord, 000209

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

Identifieur interne : 000209 ( PascalFrancis/Corpus ); précédent : 000208; suivant : 000210

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

Auteurs : Kaoutar Elkabouss ; Mohamed Kacimi ; Mahfoud Ziyad ; Souad Ammar ; Francois Bozon-Verduraz

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.

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.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

A01	`01`	`1`		`@0 0021-9517`
A02	`01`			`@0 JCTLA5`
A03		`1`		`@0 J. catal. : (Print)`
A05				`@2 226`
A06				`@2 1`
A08	`01`	`1`	`ENG`	`@1 Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations`
A11	`01`	`1`		`@1 ELKABOUSS (Kaoutar)`
A11	`02`	`1`		`@1 KACIMI (Mohamed)`
A11	`03`	`1`		`@1 ZIYAD (Mahfoud)`
A11	`04`	`1`		`@1 AMMAR (Souad)`
A11	`05`	`1`		`@1 BOZON-VERDURAZ (Francois)`
A14	`01`			`@1 Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie. @2 Rabat @3 MAR @Z 1 aut. @Z 2 aut. @Z 3 aut.`
A14	`02`			`@1 Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu @2 75251 Paris @3 FRA @Z 1 aut. @Z 4 aut. @Z 5 aut.`
A20				`@1 16-24`
A21				`@1 2004`
A23	`01`			`@0 ENG`
A43	`01`			`@1 INIST @2 9623 @5 354000113869770030`
A44				`@0 0000 @1 © 2004 INIST-CNRS. All rights reserved.`
A45				`@0 53 ref.`
A47	`01`	`1`		`@0 04-0443422`
A60				`@1 P`
A61				`@0 A`
A64	`01`	`1`		`@0 Journal of catalysis : (Print)`
A66	`01`			`@0 USA`
C01	`01`		`ENG`	@0 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.
C02	`01`	`X`		`@0 001C01A03`
C03	`01`	`X`	`FRE`	`@0 Cobalt @2 NC @5 01`
C03	`01`	`X`	`ENG`	`@0 Cobalt @2 NC @5 01`
C03	`01`	`X`	`SPA`	`@0 Cobalto @2 NC @5 01`
C03	`02`	`X`	`FRE`	`@0 Apatite hydroxylée @5 02`
C03	`02`	`X`	`ENG`	`@0 Hydroxyapatite @5 02`
C03	`02`	`X`	`SPA`	`@0 Hidroxiapatito @5 02`
C03	`03`	`X`	`FRE`	`@0 Catalyseur @5 03`
C03	`03`	`X`	`ENG`	`@0 Catalyst @5 03`
C03	`03`	`X`	`SPA`	`@0 Catalizador @5 03`
C03	`04`	`X`	`FRE`	`@0 Butanol @2 NK @2 FX @5 04`
C03	`04`	`X`	`ENG`	`@0 Butanol @2 NK @2 FX @5 04`
C03	`04`	`X`	`SPA`	`@0 Butanol @2 NK @2 FX @5 04`
C03	`05`	`X`	`FRE`	`@0 Ethane @2 NK @5 05`
C03	`05`	`X`	`ENG`	`@0 Ethane @2 NK @5 05`
C03	`05`	`X`	`SPA`	`@0 Etano @2 NK @5 05`
C03	`06`	`X`	`FRE`	`@0 Oxydation @5 06`
C03	`06`	`X`	`ENG`	`@0 Oxidation @5 06`
C03	`06`	`X`	`SPA`	`@0 Oxidación @5 06`
C03	`07`	`X`	`FRE`	`@0 Déshydrogénation @5 07`
C03	`07`	`X`	`ENG`	`@0 Dehydrogenation @5 07`
C03	`07`	`X`	`SPA`	`@0 Deshidrogenación @5 07`
C03	`08`	`X`	`FRE`	`@0 Facteur réflexion @5 08`
C03	`08`	`X`	`ENG`	`@0 Reflectance @5 08`
C03	`08`	`X`	`SPA`	`@0 Coeficiente reflexión @5 08`
C03	`09`	`X`	`FRE`	`@0 Susceptibilité magnétique @5 09`
C03	`09`	`X`	`ENG`	`@0 Magnetic susceptibility @5 09`
C03	`09`	`X`	`SPA`	`@0 Susceptibilidad magnética @5 09`
C03	`10`	`X`	`FRE`	`@0 Spectrométrie photoélectron @5 10`
C03	`10`	`X`	`ENG`	`@0 Photoelectron spectrometry @5 10`
C03	`10`	`X`	`SPA`	`@0 Espectrometría fotoelectrón @5 10`
C03	`11`	`X`	`FRE`	`@0 Rayon X @5 11`
C03	`11`	`X`	`ENG`	`@0 X ray @5 11`
C03	`11`	`X`	`SPA`	`@0 Rayos X @5 11`
C07	`01`	`X`	`FRE`	`@0 Métal transition @2 NC @5 12`
C07	`01`	`X`	`ENG`	`@0 Transition metal @2 NC @5 12`
C07	`01`	`X`	`SPA`	`@0 Metal transición @2 NC @5 12`
C07	`02`	`X`	`FRE`	`@0 Alcanol @5 13`
C07	`02`	`X`	`ENG`	`@0 Alkanol @5 13`
C07	`02`	`X`	`SPA`	`@0 Alcanol @5 13`
C07	`03`	`X`	`FRE`	`@0 Propriété magnétique @5 14`
C07	`03`	`X`	`ENG`	`@0 Magnetic properties @5 14`
C07	`03`	`X`	`SPA`	`@0 Propiedad magnética @5 14`
C07	`04`	`X`	`FRE`	`@0 Alcool @5 15`
C07	`04`	`X`	`ENG`	`@0 Alcohol @5 15`
C07	`04`	`X`	`SPA`	`@0 Alcohol @5 15`
N21				`@1 250`
N44	`01`			`@1 OTO`
N82				`@1 OTO`

Format Inist (serveur)

NO :	PASCAL 04-0443422 INIST
ET :	Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations
AU :	ELKABOUSS (Kaoutar); KACIMI (Mohamed); ZIYAD (Mahfoud); AMMAR (Souad); BOZON-VERDURAZ (Francois)
AF :	Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie./Rabat/Maroc (1 aut., 2 aut., 3 aut.); Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu/75251 Paris/France (1 aut., 4 aut., 5 aut.)
DT :	Publication en série; Niveau analytique
SO :	Journal of catalysis : (Print); ISSN 0021-9517; Coden JCTLA5; Etats-Unis; Da. 2004; Vol. 226; No. 1; Pp. 16-24; Bibl. 53 ref.
LA :	Anglais
EA :	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.
CC :	001C01A03
FD :	Cobalt; Apatite hydroxylée; Catalyseur; Butanol; Ethane; Oxydation; Déshydrogénation; Facteur réflexion; Susceptibilité magnétique; Spectrométrie photoélectron; Rayon X
FG :	Métal transition; Alcanol; Propriété magnétique; Alcool
ED :	Cobalt; Hydroxyapatite; Catalyst; Butanol; Ethane; Oxidation; Dehydrogenation; Reflectance; Magnetic susceptibility; Photoelectron spectrometry; X ray
EG :	Transition metal; Alkanol; Magnetic properties; Alcohol
SD :	Cobalto; Hidroxiapatito; Catalizador; Butanol; Etano; Oxidación; Deshidrogenación; Coeficiente reflexión; Susceptibilidad magnética; Espectrometría fotoelectrón; Rayos X
LO :	INIST-9623.354000113869770030
ID :	04-0443422

Links to Exploration step

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>
<affiliation><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>
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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><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>
</affiliation>
<affiliation><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>
</affiliation>
</author>
<author><name sortKey="Kacimi, Mohamed" sort="Kacimi, Mohamed" uniqKey="Kacimi M" first="Mohamed" last="Kacimi">Mohamed Kacimi</name>
<affiliation><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>
</affiliation>
</author>
<author><name sortKey="Ziyad, Mahfoud" sort="Ziyad, Mahfoud" uniqKey="Ziyad M" first="Mahfoud" last="Ziyad">Mahfoud Ziyad</name>
<affiliation><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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<sZ>3 aut.</sZ>
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</author>
<author><name sortKey="Ammar, Souad" sort="Ammar, Souad" uniqKey="Ammar S" first="Souad" last="Ammar">Souad Ammar</name>
<affiliation><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>
</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><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>
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</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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<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>
</textClass>
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</teiHeader>
<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>
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<fA08 i1="01" i2="1" l="ENG"><s1>Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations</s1>
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<fA11 i1="01" i2="1"><s1>ELKABOUSS (Kaoutar)</s1>
</fA11>
<fA11 i1="02" i2="1"><s1>KACIMI (Mohamed)</s1>
</fA11>
<fA11 i1="03" i2="1"><s1>ZIYAD (Mahfoud)</s1>
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<fA11 i1="04" i2="1"><s1>AMMAR (Souad)</s1>
</fA11>
<fA11 i1="05" i2="1"><s1>BOZON-VERDURAZ (Francois)</s1>
</fA11>
<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>
</fA14>
<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>
</fA14>
<fA20><s1>16-24</s1>
</fA20>
<fA21><s1>2004</s1>
</fA21>
<fA23 i1="01"><s0>ENG</s0>
</fA23>
<fA43 i1="01"><s1>INIST</s1>
<s2>9623</s2>
<s5>354000113869770030</s5>
</fA43>
<fA44><s0>0000</s0>
<s1>© 2004 INIST-CNRS. All rights reserved.</s1>
</fA44>
<fA45><s0>53 ref.</s0>
</fA45>
<fA47 i1="01" i2="1"><s0>04-0443422</s0>
</fA47>
<fA60><s1>P</s1>
</fA60>
<fA61><s0>A</s0>
</fA61>
<fA64 i1="01" i2="1"><s0>Journal of catalysis : (Print)</s0>
</fA64>
<fA66 i1="01"><s0>USA</s0>
</fA66>
<fC01 i1="01" l="ENG"><s0>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.</s0>
</fC01>
<fC02 i1="01" i2="X"><s0>001C01A03</s0>
</fC02>
<fC03 i1="01" i2="X" l="FRE"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="ENG"><s0>Cobalt</s0>
<s2>NC</s2>
<s5>01</s5>
</fC03>
<fC03 i1="01" i2="X" l="SPA"><s0>Cobalto</s0>
<s2>NC</s2>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="X" l="FRE"><s0>Apatite hydroxylée</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="ENG"><s0>Hydroxyapatite</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="X" l="SPA"><s0>Hidroxiapatito</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="X" l="FRE"><s0>Catalyseur</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="ENG"><s0>Catalyst</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="X" l="SPA"><s0>Catalizador</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="X" l="FRE"><s0>Butanol</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="ENG"><s0>Butanol</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="X" l="SPA"><s0>Butanol</s0>
<s2>NK</s2>
<s2>FX</s2>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="X" l="FRE"><s0>Ethane</s0>
<s2>NK</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="ENG"><s0>Ethane</s0>
<s2>NK</s2>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="X" l="SPA"><s0>Etano</s0>
<s2>NK</s2>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="X" l="FRE"><s0>Oxydation</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="ENG"><s0>Oxidation</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="X" l="SPA"><s0>Oxidación</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="X" l="FRE"><s0>Déshydrogénation</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="ENG"><s0>Dehydrogenation</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="X" l="SPA"><s0>Deshidrogenación</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="X" l="FRE"><s0>Facteur réflexion</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="ENG"><s0>Reflectance</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="X" l="SPA"><s0>Coeficiente reflexión</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="X" l="FRE"><s0>Susceptibilité magnétique</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="ENG"><s0>Magnetic susceptibility</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="X" l="SPA"><s0>Susceptibilidad magnética</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="X" l="FRE"><s0>Spectrométrie photoélectron</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="ENG"><s0>Photoelectron spectrometry</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="X" l="SPA"><s0>Espectrometría fotoelectrón</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="X" l="FRE"><s0>Rayon X</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="ENG"><s0>X ray</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="X" l="SPA"><s0>Rayos X</s0>
<s5>11</s5>
</fC03>
<fC07 i1="01" i2="X" l="FRE"><s0>Métal transition</s0>
<s2>NC</s2>
<s5>12</s5>
</fC07>
<fC07 i1="01" i2="X" l="ENG"><s0>Transition metal</s0>
<s2>NC</s2>
<s5>12</s5>
</fC07>
<fC07 i1="01" i2="X" l="SPA"><s0>Metal transición</s0>
<s2>NC</s2>
<s5>12</s5>
</fC07>
<fC07 i1="02" i2="X" l="FRE"><s0>Alcanol</s0>
<s5>13</s5>
</fC07>
<fC07 i1="02" i2="X" l="ENG"><s0>Alkanol</s0>
<s5>13</s5>
</fC07>
<fC07 i1="02" i2="X" l="SPA"><s0>Alcanol</s0>
<s5>13</s5>
</fC07>
<fC07 i1="03" i2="X" l="FRE"><s0>Propriété magnétique</s0>
<s5>14</s5>
</fC07>
<fC07 i1="03" i2="X" l="ENG"><s0>Magnetic properties</s0>
<s5>14</s5>
</fC07>
<fC07 i1="03" i2="X" l="SPA"><s0>Propiedad magnética</s0>
<s5>14</s5>
</fC07>
<fC07 i1="04" i2="X" l="FRE"><s0>Alcool</s0>
<s5>15</s5>
</fC07>
<fC07 i1="04" i2="X" l="ENG"><s0>Alcohol</s0>
<s5>15</s5>
</fC07>
<fC07 i1="04" i2="X" l="SPA"><s0>Alcohol</s0>
<s5>15</s5>
</fC07>
<fN21><s1>250</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 04-0443422 INIST</NO>
<ET>Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations</ET>
<AU>ELKABOUSS (Kaoutar); KACIMI (Mohamed); ZIYAD (Mahfoud); AMMAR (Souad); BOZON-VERDURAZ (Francois)</AU>
<AF>Laboratoire de Physico-Chimie des Matériaux et Catalyse, Faculté des Sciences. Département de Chimie./Rabat/Maroc (1 aut., 2 aut., 3 aut.); Groupe de Chimie des Matériaux Divisés et Catalyse, ITODYS, UMR-CNRS 7086, Université Paris 7-Denis Diderot, case 7090, 2, place Jussieu/75251 Paris/France (1 aut., 4 aut., 5 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of catalysis : (Print); ISSN 0021-9517; Coden JCTLA5; Etats-Unis; Da. 2004; Vol. 226; No. 1; Pp. 16-24; Bibl. 53 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>001C01A03</CC>
<FD>Cobalt; Apatite hydroxylée; Catalyseur; Butanol; Ethane; Oxydation; Déshydrogénation; Facteur réflexion; Susceptibilité magnétique; Spectrométrie photoélectron; Rayon X</FD>
<FG>Métal transition; Alcanol; Propriété magnétique; Alcool</FG>
<ED>Cobalt; Hydroxyapatite; Catalyst; Butanol; Ethane; Oxidation; Dehydrogenation; Reflectance; Magnetic susceptibility; Photoelectron spectrometry; X ray</ED>
<EG>Transition metal; Alkanol; Magnetic properties; Alcohol</EG>
<SD>Cobalto; Hidroxiapatito; Catalizador; Butanol; Etano; Oxidación; Deshidrogenación; Coeficiente reflexión; Susceptibilidad magnética; Espectrometría fotoelectrón; Rayos X</SD>
<LO>INIST-9623.354000113869770030</LO>
<ID>04-0443422</ID>
</server>
</inist>
</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

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