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Single - stage fischer – tropsch synthesis and hydroprocessing / Anier Freitez in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13732-13741 Titre : Single - stage fischer – tropsch synthesis and hydroprocessing : the hydroprocessing performance of Ni / ZSM - 5 / γ - Al2O3 under fischer – tropsch conditions Type de document : texte imprimé Auteurs : Anier Freitez, Auteur ; Kyra Pabst, Auteur ; Bettina Kraushaar-Czarnetzki, Auteur Année de publication : 2012 Article en page(s) : pp. 13732-13741 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Fischer  Tropsch  synthesis Résumé : The single-stage combination of Fischer―Tropsch synthesis and hydroprocessing without intermediate product fractionation has been studied using Co/Al2O3 as FT and Ni/ZSM-5/γ-Al2O3 as HP catalysts either in dual-layer arrangement or in physical mixture. Furthermore, the performance of the hydroprocessing catalyst under Fischer―Tropsch conditions was investigated in more detail in the gas phase hydroprocessing of n-dodecane in the presence of CO and H2O vapor, mimicking 69.4% Fischer-Tropsch conversion. All experiments were conducted at 10 bar and varying temperatures and residence times. In the gas phase hydroconversion of n-dodecane, CO and H2O showed a strongly inhibiting effect. The disturbance of the hydrogenation fimction by CO is most detrimental because enduring deactivation by coke formation is initiated. In combined single-stage experiments, the formation of a liquid hydrocarbon film in the FT reactions reduces the impact of the inhibitors to a large extent. Here, the hydroprocessing performance is mostly determined by the ratio H2/hydrocarbons. In both single-stage configurations, lower C numbers and larger isomer fractions as compared to the FT reference evidenced the activity of the HP catalyst. In physical mixture configuration, however, the HP catalyst benefits from the higher H2/hydrocarbon ratios along the complete catalyst bed, resulting in a more efficient reduction of C21+ hydrocarbons and high isomer fractions in a broader range of carbon numbers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299836 [article] Single - stage fischer – tropsch synthesis and hydroprocessing : the hydroprocessing performance of Ni / ZSM - 5 / γ - Al2O3 under fischer – tropsch conditions [texte imprimé] / Anier Freitez, Auteur ; Kyra Pabst, Auteur ; Bettina Kraushaar-Czarnetzki, Auteur . - 2012 . - pp. 13732-13741. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13732-13741 Mots-clés : Fischer  Tropsch  synthesis Résumé : The single-stage combination of Fischer―Tropsch synthesis and hydroprocessing without intermediate product fractionation has been studied using Co/Al2O3 as FT and Ni/ZSM-5/γ-Al2O3 as HP catalysts either in dual-layer arrangement or in physical mixture. Furthermore, the performance of the hydroprocessing catalyst under Fischer―Tropsch conditions was investigated in more detail in the gas phase hydroprocessing of n-dodecane in the presence of CO and H2O vapor, mimicking 69.4% Fischer-Tropsch conversion. All experiments were conducted at 10 bar and varying temperatures and residence times. In the gas phase hydroconversion of n-dodecane, CO and H2O showed a strongly inhibiting effect. The disturbance of the hydrogenation fimction by CO is most detrimental because enduring deactivation by coke formation is initiated. In combined single-stage experiments, the formation of a liquid hydrocarbon film in the FT reactions reduces the impact of the inhibitors to a large extent. Here, the hydroprocessing performance is mostly determined by the ratio H2/hydrocarbons. In both single-stage configurations, lower C numbers and larger isomer fractions as compared to the FT reference evidenced the activity of the HP catalyst. In physical mixture configuration, however, the HP catalyst benefits from the higher H2/hydrocarbon ratios along the complete catalyst bed, resulting in a more efficient reduction of C21+ hydrocarbons and high isomer fractions in a broader range of carbon numbers. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25299836