Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral
Identifieur interne : 000105 ( PascalFrancis/Corpus ); précédent : 000104; suivant : 000106Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral
Auteurs : K. Kouachi ; G. Lafaye ; C. Especel ; O. Cherifi ; P. MarecotSource :
- Journal of molecular catalysis. A, Chemical [ 1381-1169 ] ; 2009.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
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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Format Inist (serveur)
NO : | PASCAL 09-0358438 INIST |
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ET : | Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral |
AU : | KOUACHI (K.); LAFAYE (G.); ESPECEL (C.); CHERIFI (O.); MARECOT (P.) |
AF : | Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503/82022 Poitiers/France (1 aut., 2 aut., 3 aut., 5 aut.); Laboratoire de Chimie de Gaz Naturel, Faculté de Chimie, USTHB, BP 32/16111 El Alia, Bab Euouar/Algérie (1 aut., 4 aut.) |
DT : | Publication en série; Niveau analytique |
SO : | Journal of molecular catalysis. A, Chemical; ISSN 1381-1169; Pays-Bas; Da. 2009; Vol. 308; No. 1-2; Pp. 142-149; Bibl. 37 ref. |
LA : | Anglais |
EA : | 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. |
CC : | 001C01A03; 001C01J04 |
FD : | Préparation; Silice; Catalyseur sur support; Catalyse hétérogène; Cobalt; Microémulsion eau huile; Hydrogénation; Citral; Alcool; Aldéhyde; SiO2; O Si |
FG : | Composé binaire; Métal transition |
ED : | Preparation; Silica; Supported catalyst; Heterogeneous catalysis; Cobalt; Water oil microemulsion; Hydrogenation; Citral; Alcohol; Aldehyde |
EG : | Binary compound; Transition metal |
SD : | Preparación; Sílice; Catalizador sobre soporte; Catálisis heterogénea; Cobalto; Microemulsión agua aceite; Hidrogenación; Alcohol; Aldehído |
LO : | INIST-17107A.354000187502170180 |
ID : | 09-0358438 |
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Pascal:09-0358438Le document en format XML
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<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>
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<server><NO>PASCAL 09-0358438 INIST</NO>
<ET>Preparation of silica-supported cobalt catalysts from water-in-oil microemulsion for selective hydrogenation of citral</ET>
<AU>KOUACHI (K.); LAFAYE (G.); ESPECEL (C.); CHERIFI (O.); MARECOT (P.)</AU>
<AF>Université de Poitiers, Laboratoire de Catalyse en Chimie Organique, UMR 6503/82022 Poitiers/France (1 aut., 2 aut., 3 aut., 5 aut.); Laboratoire de Chimie de Gaz Naturel, Faculté de Chimie, USTHB, BP 32/16111 El Alia, Bab Euouar/Algérie (1 aut., 4 aut.)</AF>
<DT>Publication en série; Niveau analytique</DT>
<SO>Journal of molecular catalysis. A, Chemical; ISSN 1381-1169; Pays-Bas; Da. 2009; Vol. 308; No. 1-2; Pp. 142-149; Bibl. 37 ref.</SO>
<LA>Anglais</LA>
<EA>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.</EA>
<CC>001C01A03; 001C01J04</CC>
<FD>Préparation; Silice; Catalyseur sur support; Catalyse hétérogène; Cobalt; Microémulsion eau huile; Hydrogénation; Citral; Alcool; Aldéhyde; SiO2; O Si</FD>
<FG>Composé binaire; Métal transition</FG>
<ED>Preparation; Silica; Supported catalyst; Heterogeneous catalysis; Cobalt; Water oil microemulsion; Hydrogenation; Citral; Alcohol; Aldehyde</ED>
<EG>Binary compound; Transition metal</EG>
<SD>Preparación; Sílice; Catalizador sobre soporte; Catálisis heterogénea; Cobalto; Microemulsión agua aceite; Hidrogenación; Alcohol; Aldehído</SD>
<LO>INIST-17107A.354000187502170180</LO>
<ID>09-0358438</ID>
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