Effect of pretreatment conditions on the catalytic performance of Ni-Pt-W supported on amorphous silica-alumina catalysts Part 1. Catalysts prepared by a sol-gel method
Identifieur interne : 000590 ( Main/Curation ); précédent : 000589; suivant : 000591Effect of pretreatment conditions on the catalytic performance of Ni-Pt-W supported on amorphous silica-alumina catalysts Part 1. Catalysts prepared by a sol-gel method
Auteurs : Yacine Rezgui [Algérie] ; Miloud Guemini [Algérie]Source :
- Applied catalysis. A, General [ 0926-860X ] ; 2008.
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Abstract
In this work, the catalytic behavior of Pt-Ni-WOx supported on amorphous silica-alumina catalysts, prepared by means of a sol-gel technique was tested by hydroisomerization of n-hexane in a continuous fixed-bed reactor operating at atmospheric pressure. Temperature-programmed desorption of ammonia (TPDA), temperature-programmed reduction, BET and atomic absorption spectroscopy techniques were used to characterize the catalysts. The results revealed that both catalytic activity and surface acidity of these solids is strongly dependent on their calcination and reduction temperatures. Besides, the collected data showed that platinum interacts with tungsten and this interaction depends on the pretreatment conditions.
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Pascal:08-0178007Le document en format XML
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<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Recherche de Chimie Appliquée et Technologie des Matériaux, Université d'Oum El Bouaghi, B.P. 358, Route de Constantine</s1>
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<author><name sortKey="Guemini, Miloud" sort="Guemini, Miloud" uniqKey="Guemini M" first="Miloud" last="Guemini">Miloud Guemini</name>
<affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Laboratoire de Recherche de Chimie Appliquée et Technologie des Matériaux, Université d'Oum El Bouaghi, B.P. 358, Route de Constantine</s1>
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<series><title level="j" type="main">Applied catalysis. A, General</title>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acidity</term>
<term>Alumina</term>
<term>Catalyst</term>
<term>Catalytic reaction</term>
<term>Chemical reduction</term>
<term>Heterogeneous catalysis</term>
<term>Isomerization</term>
<term>Nickel</term>
<term>Platinum</term>
<term>Pretreatment</term>
<term>Silica</term>
<term>Sol gel process</term>
<term>Support</term>
<term>Tungsten oxide</term>
</keywords>
<keywords scheme="Pascal" xml:lang="fr"><term>Prétraitement</term>
<term>Réaction catalytique</term>
<term>Support</term>
<term>Silice</term>
<term>Alumine</term>
<term>Catalyseur</term>
<term>Procédé sol gel</term>
<term>Platine</term>
<term>Oxyde de tungstène</term>
<term>Nickel</term>
<term>Isomérisation</term>
<term>Réduction chimique</term>
<term>Acidité</term>
<term>Catalyse hétérogène</term>
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<keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Platine</term>
<term>Nickel</term>
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<front><div type="abstract" xml:lang="en">In this work, the catalytic behavior of Pt-Ni-WO<sub>x</sub>
supported on amorphous silica-alumina catalysts, prepared by means of a sol-gel technique was tested by hydroisomerization of n-hexane in a continuous fixed-bed reactor operating at atmospheric pressure. Temperature-programmed desorption of ammonia (TPDA), temperature-programmed reduction, BET and atomic absorption spectroscopy techniques were used to characterize the catalysts. The results revealed that both catalytic activity and surface acidity of these solids is strongly dependent on their calcination and reduction temperatures. Besides, the collected data showed that platinum interacts with tungsten and this interaction depends on the pretreatment conditions.</div>
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