Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations
Identifieur interne : 000212 ( PascalFrancis/Checkpoint ); précédent : 000211; suivant : 000213Cobalt-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.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Cobalt.
English descriptors
- KwdEn :
Abstract
A series of exchanged cobalt/calcium (Co2+/Ca2+) hydroxyapatite Ca10-xCox (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.
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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><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><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="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></imprint></series></biblStruct></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></textClass></profileDesc></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><inist><standard h6="B"><pA><fA01 i1="01" i2="1"><s0>0021-9517</s0></fA01><fA02 i1="01"><s0>JCTLA5</s0></fA02><fA03 i2="1"><s0>J. catal. : (Print)</s0></fA03><fA05><s2>226</s2></fA05><fA06><s2>1</s2></fA06><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></fA08><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></fA11><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></inist><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>Pour manipuler ce document sous Unix (Dilib)
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|texte= Cobalt-exchanged hydroxyapatite catalysts: Magnetic studies, spectroscopic investigations, performance in 2-butanol and ethane oxidative dehydrogenations
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