Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids : Role and optimal concentration of each active species in n-hexane isomerization : Highly organized catalytic systems
Identifieur interne : 000716 ( Main/Exploration ); précédent : 000715; suivant : 000717Mechanical mixtures of Me (Ni, Pd) Ce oxides and silica-supported heteropolyacids : Role and optimal concentration of each active species in n-hexane isomerization : Highly organized catalytic systems
Auteurs : R. Hubaut [France] ; B. Ouled Ben Tayeb [France, Maroc] ; W. Kuang [France, Canada] ; A. Rives [France] ; M. Fournier [France]Source :
- Kinetics and catalysis [ 0023-1584 ] ; 2006.
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Abstract
Catalytic properties of silica-supported heteropolyacids (HPA) in a mechanical mixture with reduced Me-Ce oxides (Me = Ni, Pd) in n-hexane isomerization are studied. The role of each component of the mixed oxides (Ce and, typically, Ni and Pd) and their optimum content has been illuminated: cerium is not only beneficial for eliminating or preventing coke deposition but is also effective for maintaining the Keggin structure of the highly-organized HPA during the reaction and probably allows a better dispersion of the second metal species. Nickel and palladium, present as Ni° and Pd°, reinforce the activation of the alkane, which is difficult to obtain by means of a direct attack by an acid, and, thus, enhance noticeably the activity of the catalyst. The best mechanical mixtures are obtained with 30-70 wt % NiCeO-HPW/SiO2 and 50-50 wt % Pd0.1CeO-HPW/SiO2. These mixtures have the highest efficiency for a Ni/(Ni + W) atomic ratio of 0.66 and a Pd/(Pd + W) ratio of 0.40, respectively. Finally, the conversion of n-hexane is in the order HPW > HSiW > HBW, which seems to be consistent with the order of their acid strength as per the literature, but the isomerization selectivity appears to be slightly higher on HSiW.
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Hubaut</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Catalyse, UMR CNRS 8010, Batiment C 3, Université des Sciences et des Technologies de Lille</s1><s2>59655 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Hauts-de-France</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Villeneuve d'Ascq</settlement></placeName></affiliation></author><author><name sortKey="Ben Tayeb, B Ouled" sort="Ben Tayeb, B Ouled" uniqKey="Ben Tayeb B" first="B. Ouled" last="Ben Tayeb">B. Ouled Ben Tayeb</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Catalyse, UMR CNRS 8010, Batiment C 3, Université des Sciences et des Technologies de Lille</s1><s2>59655 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Hauts-de-France</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Villeneuve d'Ascq</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Département de Chimie, Ecole Normale Supérieure de Fés</s1><s3>MAR</s3><sZ>2 aut.</sZ></inist:fA14><country>Maroc</country><wicri:noRegion>Département de Chimie, Ecole Normale Supérieure de Fés</wicri:noRegion></affiliation></author><author><name sortKey="Kuang, W" sort="Kuang, W" uniqKey="Kuang W" first="W." last="Kuang">W. Kuang</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Catalyse, UMR CNRS 8010, Batiment C 3, Université des Sciences et des Technologies de Lille</s1><s2>59655 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Hauts-de-France</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Villeneuve d'Ascq</settlement></placeName></affiliation><affiliation wicri:level="1"><inist:fA14 i1="03"><s1>Department of Chemistry, University of Ottawa, 10 Marie Curie</s1><s2>Ottawa, Ontario, KIN 6N5</s2><s3>CAN</s3><sZ>3 aut.</sZ></inist:fA14><country>Canada</country><wicri:noRegion>Ottawa, Ontario, KIN 6N5</wicri:noRegion></affiliation></author><author><name sortKey="Rives, A" sort="Rives, A" uniqKey="Rives A" first="A." last="Rives">A. Rives</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Catalyse, UMR CNRS 8010, Batiment C 3, Université des Sciences et des Technologies de Lille</s1><s2>59655 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Hauts-de-France</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Villeneuve d'Ascq</settlement></placeName></affiliation></author><author><name sortKey="Fournier, M" sort="Fournier, M" uniqKey="Fournier M" first="M." last="Fournier">M. Fournier</name><affiliation wicri:level="3"><inist:fA14 i1="01"><s1>Laboratoire de Catalyse, UMR CNRS 8010, Batiment C 3, Université des Sciences et des Technologies de Lille</s1><s2>59655 Villeneuve d'Ascq</s2><s3>FRA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>France</country><placeName><region type="region" nuts="2">Hauts-de-France</region><region type="old region" nuts="2">Nord-Pas-de-Calais</region><settlement type="city">Villeneuve d'Ascq</settlement></placeName></affiliation></author></analytic><series><title level="j" type="main">Kinetics and catalysis</title><title level="j" type="abbreviated">Kinet. catal.</title><idno type="ISSN">0023-1584</idno><imprint><date when="2006">2006</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Kinetics and catalysis</title><title level="j" type="abbreviated">Kinet. catal.</title><idno type="ISSN">0023-1584</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acids</term><term>Activation</term><term>Alkane</term><term>Catalyst activity</term><term>Catalytic reaction</term><term>Cerium</term><term>Coke deposition</term><term>Conversion</term><term>Dispersion</term><term>Efficiency</term><term>Heteropolyacid</term><term>Hexane</term><term>Isomerization</term><term>Nickel</term><term>Oxides</term><term>Palladium</term><term>Platinoid</term><term>Selectivity</term><term>Silica</term><term>Structure</term><term>Support</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Oxyde</term><term>Silice</term><term>Support</term><term>Hétéropolyacide</term><term>Hexane</term><term>Isomérisation</term><term>Réaction catalytique</term><term>Cérium</term><term>Dépôt coke</term><term>Structure</term><term>Dispersion</term><term>Nickel</term><term>Palladium</term><term>Platinoïde</term><term>Activation</term><term>Alcane</term><term>Acide</term><term>Activité catalytique</term><term>Efficacité</term><term>Conversion</term><term>Sélectivité</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Oxyde</term><term>Nickel</term><term>Acide</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Catalytic properties of silica-supported heteropolyacids (HPA) in a mechanical mixture with reduced Me-Ce oxides (Me = Ni, Pd) in n-hexane isomerization are studied. The role of each component of the mixed oxides (Ce and, typically, Ni and Pd) and their optimum content has been illuminated: cerium is not only beneficial for eliminating or preventing coke deposition but is also effective for maintaining the Keggin structure of the highly-organized HPA during the reaction and probably allows a better dispersion of the second metal species. Nickel and palladium, present as Ni° and Pd°, reinforce the activation of the alkane, which is difficult to obtain by means of a direct attack by an acid, and, thus, enhance noticeably the activity of the catalyst. The best mechanical mixtures are obtained with 30-70 wt % NiCeO-HPW/SiO<sub>2</sub> and 50-50 wt % Pd<sub>0.1</sub>CeO-HPW/SiO<sub>2</sub>. These mixtures have the highest efficiency for a Ni/(Ni + W) atomic ratio of 0.66 and a Pd/(Pd + W) ratio of 0.40, respectively. Finally, the conversion of n-hexane is in the order HPW > HSiW > HBW, which seems to be consistent with the order of their acid strength as per the literature, but the isomerization selectivity appears to be slightly higher on HSiW.</div></front></TEI><affiliations><list><country><li>Canada</li><li>France</li><li>Maroc</li></country><region><li>Hauts-de-France</li><li>Nord-Pas-de-Calais</li></region><settlement><li>Villeneuve d'Ascq</li></settlement></list><tree><country name="France"><region name="Hauts-de-France"><name sortKey="Hubaut, R" sort="Hubaut, R" uniqKey="Hubaut R" first="R." last="Hubaut">R. Hubaut</name></region><name sortKey="Ben Tayeb, B Ouled" sort="Ben Tayeb, B Ouled" uniqKey="Ben Tayeb B" first="B. Ouled" last="Ben Tayeb">B. Ouled Ben Tayeb</name><name sortKey="Fournier, M" sort="Fournier, M" uniqKey="Fournier M" first="M." last="Fournier">M. Fournier</name><name sortKey="Kuang, W" sort="Kuang, W" uniqKey="Kuang W" first="W." last="Kuang">W. Kuang</name><name sortKey="Rives, A" sort="Rives, A" uniqKey="Rives A" first="A." last="Rives">A. Rives</name></country><country name="Maroc"><noRegion><name sortKey="Ben Tayeb, B Ouled" sort="Ben Tayeb, B Ouled" uniqKey="Ben Tayeb B" first="B. Ouled" last="Ben Tayeb">B. Ouled Ben Tayeb</name></noRegion></country><country name="Canada"><noRegion><name sortKey="Kuang, W" sort="Kuang, W" uniqKey="Kuang W" first="W." last="Kuang">W. Kuang</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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