| Titre : | Hydroisomerization of n-heptane over Pt-loaded USY zeolites. effect of steaming, dealumination, and the resulting structure on catalytic properties (2011) |
| Auteurs : | Raed H. Abudawood, Auteur ; Faisal M. Alotaibi, Auteur ; Arthur A. Garforth, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Industrial & engineering chemistry research (Vol. 50 N° 17, Septembre 2011) |
| Article en page(s) : | pp. 9918-9924 |
| Note générale : | Chimie industrielle |
| Langues : | Anglais |
| Tags : | 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 |
