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Hydroisomerization of n-heptane over Pt-loaded USY zeolites. effect of steaming, dealumination, and the resulting structure on catalytic properties / Raed H. Abudawood in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9918-9924 Titre : Hydroisomerization of n-heptane over Pt-loaded USY zeolites. effect of steaming, dealumination, and the resulting structure on catalytic properties Type de document : texte imprimé Auteurs : Raed H. Abudawood, Auteur ; Faisal M. Alotaibi, Auteur ; Arthur A. Garforth, Auteur Année de publication : 2011 Article en page(s) : pp. 9918-9924 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  reaction  Zeolite  Hydrotreatin  Isomerization Résumé : The hydroconversion of n-heptane was studied on five USY zeolite samples loaded with 1 wt%Pt. Experiments were performed on a continuous fixed-bed stainless steel reactor at 210-310 °C and pressures up to 15 bar. Three in-house samples were subjected to steaming treatment, and the remaining were acid-leached from a commercial source. The study aimed to evaluate the effect of acid leaching, and its subsequent extraframework alumina (EFAL) species removal, on the performance of bifunctional USY zeolite catalysts during n-heptane transformation. Results have shown that steamed samples generate more cracked products at higher conversions when compared to acid-leached ones, more than likely due to a high presence of EFAL species. The degree of steaming played a role in decreasing cracking tendency at higher pressures, which is attributed to pore structure change and decreasing acidity. In addition, steaming resulted in a catalyst sample capable of generating isomers with blended research octane numbers dose to those achieved with a robust commercial catalyst. However, poisoning experiments have shown that these two catalysts are highly sensitive to sulfur and require sulfur-free feeds in order to demonstrate their full capacities. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483635 [article] Hydroisomerization of n-heptane over Pt-loaded USY zeolites. effect of steaming, dealumination, and the resulting structure on catalytic properties [texte imprimé] / Raed H. Abudawood, Auteur ; Faisal M. Alotaibi, Auteur ; Arthur A. Garforth, Auteur . - 2011 . - pp. 9918-9924. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 9918-9924 Mots-clés : Catalytic  reaction  Zeolite  Hydrotreatin  Isomerization Résumé : The hydroconversion of n-heptane was studied on five USY zeolite samples loaded with 1 wt%Pt. Experiments were performed on a continuous fixed-bed stainless steel reactor at 210-310 °C and pressures up to 15 bar. Three in-house samples were subjected to steaming treatment, and the remaining were acid-leached from a commercial source. The study aimed to evaluate the effect of acid leaching, and its subsequent extraframework alumina (EFAL) species removal, on the performance of bifunctional USY zeolite catalysts during n-heptane transformation. Results have shown that steamed samples generate more cracked products at higher conversions when compared to acid-leached ones, more than likely due to a high presence of EFAL species. The degree of steaming played a role in decreasing cracking tendency at higher pressures, which is attributed to pore structure change and decreasing acidity. In addition, steaming resulted in a catalyst sample capable of generating isomers with blended research octane numbers dose to those achieved with a robust commercial catalyst. However, poisoning experiments have shown that these two catalysts are highly sensitive to sulfur and require sulfur-free feeds in order to demonstrate their full capacities. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483635