Support effects on the oxidative dehydrogenation of ethane to ethylene over platinum catalysts / Rohan Gudgila in Industrial & engineering chemistry research, Vol. 50 N° 14 (Juillet 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8438-8443 Titre : Support effects on the oxidative dehydrogenation of ethane to ethylene over platinum catalysts Type de document : texte imprimé Auteurs : Rohan Gudgila, Auteur ; Corey A. Leclerc, Auteur Année de publication : 2011 Article en page(s) : pp. 8438-8443 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Oxidative dehydrogenation Platinum catalysts Résumé : Oxidative dehydrogenation of ethane to form ethylene was carried out over a platinum catalyst at short contact times. Alumina, zirconia, or silica reticulated foams were used as catalyst supports. The carbon selectivity to form ethylene was affected by the support material whereas the conversion of ethane was not affected to a large extent. The selectivity to form ethylene decreased from silica, to alumina, to zirconia. The temperature programmed desorption of ammonia carried out on the support materials showed that the zirconia support had a higher concentration of acid sites than either alumina or silica. After coating the supports, hydrogen chemisorption on the used catalyst showed metal dispersion was highest on silica and lowest on zirconia. The much higher selectivity on silica and alumina as compared to zirconia is explained by the lack of acid sites that catalyze the decomposition of ethylene to carbon. The higher dispersion of platinum on silica versus alumina will lead to a decrease in platinum metal costs of a real catalyst. The silica-supported catalyst achieved a yield close to that of a steam cracker without any attempt to optimize the system. DEWEY : 660 ISSN : 0888-5885 En ligne : http://journals1.scholarsportal.info/details.xqy?uri=/08885885/v50i0014/8438_seo [...] [article] Support effects on the oxidative dehydrogenation of ethane to ethylene over platinum catalysts [texte imprimé] / Rohan Gudgila, Auteur ; Corey A. Leclerc, Auteur . - 2011 . - pp. 8438-8443. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 14 (Juillet 2011) . - pp. 8438-8443 Mots-clés : Oxidative dehydrogenation Platinum catalysts Résumé : Oxidative dehydrogenation of ethane to form ethylene was carried out over a platinum catalyst at short contact times. Alumina, zirconia, or silica reticulated foams were used as catalyst supports. The carbon selectivity to form ethylene was affected by the support material whereas the conversion of ethane was not affected to a large extent. The selectivity to form ethylene decreased from silica, to alumina, to zirconia. The temperature programmed desorption of ammonia carried out on the support materials showed that the zirconia support had a higher concentration of acid sites than either alumina or silica. After coating the supports, hydrogen chemisorption on the used catalyst showed metal dispersion was highest on silica and lowest on zirconia. The much higher selectivity on silica and alumina as compared to zirconia is explained by the lack of acid sites that catalyze the decomposition of ethylene to carbon. The higher dispersion of platinum on silica versus alumina will lead to a decrease in platinum metal costs of a real catalyst. The silica-supported catalyst achieved a yield close to that of a steam cracker without any attempt to optimize the system. DEWEY : 660 ISSN : 0888-5885 En ligne : http://journals1.scholarsportal.info/details.xqy?uri=/08885885/v50i0014/8438_seo [...]

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