Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts / Shuang Deng in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Titre : Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts Type de document : texte imprimé Auteurs : Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur Année de publication : 2009 Article en page(s) : pp. 7561–7566 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Fe−  Cr/ZrO2 catalysts Thermogravimetric analysis Ethylene Ethane Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387 [article] Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts [texte imprimé] / Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur . - 2009 . - pp. 7561–7566. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Mots-clés : Fe−  Cr/ZrO2 catalysts Thermogravimetric analysis Ethylene Ethane Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387

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