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Catalytic conversion of thiophene under mild conditions over a ZSM-5 catalyst / Lisette Jaimes in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7505–7516 Titre : Catalytic conversion of thiophene under mild conditions over a ZSM-5 catalyst : a kinetic model Type de document : texte imprimé Auteurs : Lisette Jaimes, Auteur ; Hugo De Lasa, Auteur Année de publication : 2009 Article en page(s) : pp. 7505–7516 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : FCC  gasoline  processes  H-ZSM-5  zeolite  Thiophene Résumé : Currently, refiners consider the post-treatment of FCC gasoline processes to be a viable and likely less costly path for meeting environmental regulations on sulfur. Several promising catalytic desulfurization post-treatment processes do not require hydrogen addition and use zeolites. This type of desulfurization leads to significant levels of coke, and as a result, it is being considered for implementation in twin fluid beds (reactor and regenerator) to maintain the catalyst activity. This study evaluates the conversion of thiophene on H-ZSM-5 zeolite in a silica matrix. Experiments were carried out in the CREC fluidized riser simulator under mild conditions using thiophene/n-octane and thiophene/1-octene mixtures. The results show a high and selective thiophene conversion. It is speculated that thiophene conversion takes place via ring opening and alkylation to form H2S, aromatics, alkylthiophenes, benzothiophene, and coke. These observations are in agreement with previous thermodynamic analyses. On this basis, a reaction network and kinetic model are proposed. Numerical regression leads to kinetic parameters with narrow spans, suggesting that the proposed model satisfactorily simulate thiophene removal under the suggested gasoline post-treatment conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8020126 [article] Catalytic conversion of thiophene under mild conditions over a ZSM-5 catalyst : a kinetic model [texte imprimé] / Lisette Jaimes, Auteur ; Hugo De Lasa, Auteur . - 2009 . - pp. 7505–7516. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7505–7516 Mots-clés : FCC  gasoline  processes  H-ZSM-5  zeolite  Thiophene Résumé : Currently, refiners consider the post-treatment of FCC gasoline processes to be a viable and likely less costly path for meeting environmental regulations on sulfur. Several promising catalytic desulfurization post-treatment processes do not require hydrogen addition and use zeolites. This type of desulfurization leads to significant levels of coke, and as a result, it is being considered for implementation in twin fluid beds (reactor and regenerator) to maintain the catalyst activity. This study evaluates the conversion of thiophene on H-ZSM-5 zeolite in a silica matrix. Experiments were carried out in the CREC fluidized riser simulator under mild conditions using thiophene/n-octane and thiophene/1-octene mixtures. The results show a high and selective thiophene conversion. It is speculated that thiophene conversion takes place via ring opening and alkylation to form H2S, aromatics, alkylthiophenes, benzothiophene, and coke. These observations are in agreement with previous thermodynamic analyses. On this basis, a reaction network and kinetic model are proposed. Numerical regression leads to kinetic parameters with narrow spans, suggesting that the proposed model satisfactorily simulate thiophene removal under the suggested gasoline post-treatment conditions. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8020126