Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral
Identifieur interne : 000713 ( Main/Exploration ); précédent : 000712; suivant : 000714Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral
Auteurs : K. Kouachi [France, Algérie] ; G. Lafaye [France] ; C. Especel [France] ; O. Cherifi [Algérie] ; P. Marecot [France]Source :
- Journal of molecular catalysis. A, Chemical [ 1381-1169 ] ; 2009.
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Abstract
Silica-supported Co catalysts with different metal loadings were prepared by water-in-oil (w/o) microemulsion (ME) and tested for the selective hydrogenation of citral. The performances of the ME samples were compared to those of previously studied Co impregnated catalysts. Compared to impregnated Co catalysts, ME samples show more homogeneously dispersed Co particles, the crystallite mean size increasing with the Co content. For the ME samples, the selectivity to unsaturated alcohols (i.e. nerol and geraniol) increases with the metal content then reaches a plateau from approximately 15 wt% Co, suggesting that particles of large enough size are required to optimize the C=O group activation. Above 15 wt% Co content, the selectivity is markedly higher on the ME catalysts compared to the impregnated ones (90% versus 45-65% depending on the nature of the support). This result can be directly related to the higher proportion of β H-Co species detected by temperature-programmed desorption of hydrogen (H2-TPD) on these ME samples.
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Kouachi</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503</s1><s2>82022 Poitiers</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><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">Poitiers</settlement></placeName><orgName type="university">Université de Poitiers</orgName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Chimie de Gaz Naturel, Faculté de Chimie, USTHB, BP 32</s1><s2>16111 El Alia, Bab Euouar</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>16111 El Alia, Bab Euouar</wicri:noRegion></affiliation></author><author><name sortKey="Lafaye, G" sort="Lafaye, G" uniqKey="Lafaye G" first="G." last="Lafaye">G. Lafaye</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503</s1><s2>82022 Poitiers</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><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">Poitiers</settlement></placeName><orgName type="university">Université de Poitiers</orgName></affiliation></author><author><name sortKey="Especel, C" sort="Especel, C" uniqKey="Especel C" first="C." last="Especel">C. Especel</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503</s1><s2>82022 Poitiers</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><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">Poitiers</settlement></placeName><orgName type="university">Université de Poitiers</orgName></affiliation></author><author><name sortKey="Cherifi, O" sort="Cherifi, O" uniqKey="Cherifi O" first="O." last="Cherifi">O. Cherifi</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Laboratoire de Chimie de Gaz Naturel, Faculté de Chimie, USTHB, BP 32</s1><s2>16111 El Alia, Bab Euouar</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>4 aut.</sZ></inist:fA14><country>Algérie</country><wicri:noRegion>16111 El Alia, Bab Euouar</wicri:noRegion></affiliation></author><author><name sortKey="Marecot, P" sort="Marecot, P" uniqKey="Marecot P" first="P." last="Marecot">P. Marecot</name><affiliation wicri:level="4"><inist:fA14 i1="01"><s1>Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503</s1><s2>82022 Poitiers</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><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">Poitiers</settlement></placeName><orgName type="university">Université de Poitiers</orgName></affiliation></author></analytic><series><title level="j" type="main">Journal of molecular catalysis. A, Chemical</title><title level="j" type="abbreviated">J. mol. catal., A Chem.</title><idno type="ISSN">1381-1169</idno><imprint><date when="2009">2009</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of molecular catalysis. A, Chemical</title><title level="j" type="abbreviated">J. mol. catal., A Chem.</title><idno type="ISSN">1381-1169</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Alcohol</term><term>Aldehyde</term><term>Citral</term><term>Cobalt</term><term>Heterogeneous catalysis</term><term>Hydrogenation</term><term>Preparation</term><term>Silica</term><term>Supported catalyst</term><term>Water oil microemulsion</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Préparation</term><term>Silice</term><term>Catalyseur sur support</term><term>Catalyse hétérogène</term><term>Cobalt</term><term>Microémulsion eau huile</term><term>Hydrogénation</term><term>Citral</term><term>Alcool</term><term>Aldéhyde</term><term>SiO2</term><term>O Si</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Cobalt</term><term>Alcool</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Silica-supported Co catalysts with different metal loadings were prepared by water-in-oil (w/o) microemulsion (ME) and tested for the selective hydrogenation of citral. The performances of the ME samples were compared to those of previously studied Co impregnated catalysts. Compared to impregnated Co catalysts, ME samples show more homogeneously dispersed Co particles, the crystallite mean size increasing with the Co content. For the ME samples, the selectivity to unsaturated alcohols (i.e. nerol and geraniol) increases with the metal content then reaches a plateau from approximately 15 wt% Co, suggesting that particles of large enough size are required to optimize the C=O group activation. Above 15 wt% Co content, the selectivity is markedly higher on the ME catalysts compared to the impregnated ones (90% versus 45-65% depending on the nature of the support). This result can be directly related to the higher proportion of β H-Co species detected by temperature-programmed desorption of hydrogen (H<sub>2</sub>-TPD) on these ME samples.</div></front></TEI><affiliations><list><country><li>Algérie</li><li>France</li></country><region><li>Midi-Pyrénées</li><li>Occitanie (région administrative)</li></region><settlement><li>Poitiers</li></settlement><orgName><li>Université de Poitiers</li></orgName></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Kouachi, K" sort="Kouachi, K" uniqKey="Kouachi K" first="K." last="Kouachi">K. Kouachi</name></region><name sortKey="Especel, C" sort="Especel, C" uniqKey="Especel C" first="C." last="Especel">C. Especel</name><name sortKey="Lafaye, G" sort="Lafaye, G" uniqKey="Lafaye G" first="G." last="Lafaye">G. Lafaye</name><name sortKey="Marecot, P" sort="Marecot, P" uniqKey="Marecot P" first="P." last="Marecot">P. Marecot</name></country><country name="Algérie"><noRegion><name sortKey="Kouachi, K" sort="Kouachi, K" uniqKey="Kouachi K" first="K." last="Kouachi">K. Kouachi</name></noRegion><name sortKey="Cherifi, O" sort="Cherifi, O" uniqKey="Cherifi O" first="O." last="Cherifi">O. Cherifi</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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