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Catalytic behaviors of bifunctional Fe-HZSM-5 catalyst in Fischer–Tropsch synthesis / Ali Nakhaei Pour in Journal of natural gas science and engineering, Vol. 1 N° 6 (Décembre 2009) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 1 N° 6 (Décembre 2009) . - pp. 183-189 Titre : Catalytic behaviors of bifunctional Fe-HZSM-5 catalyst in Fischer–Tropsch synthesis Type de document : texte imprimé Auteurs : Ali Nakhaei Pour, Auteur ; Masoud Zare, Auteur ; Seyed Mehdi Kamali Shahri, Auteur Article en page(s) : pp. 183-189 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Iron  catalyst  HZSM-5  zeolite  Bifunctional  catalyst  Fischer–Tropsch  synthesis Index. décimale : 665.7 Résumé : Fe-HZSM-5 bifunctional catalyst activity and products selectivity in Fischer–Tropsch synthesis (FTS) were investigated. HZSM-5 zeolite and iron catalyst were become near to each other step-by-step. In first step, zeolite just affected gaseous products after FTS reaction on iron catalyst. In other conditions, zeolite was incorporated in FTS process to be included in cracking and aromatization reactions. The results revealed that role of zeolite in overall reaction were increased from completely separated condition to physically mixed condition. Addition of binder in physically mixed condition was led to cover the active sites of bifunctional iron–zeolite catalyst and decrease activity of zeolite and iron catalyst. Also, decreasing amounts of Brønsted acid sites after FT reaction was related to zeolite incorporation in overall reaction that was decreased by closing the zeolite to the iron catalyst. HZSM-5 addition to FT catalyst suppressed the formation of oxygenates, which are converted to hydrocarbons on the zeolite acid sites. Furthermore, zeolite increased CO2 selectivity slightly because of oxygenate decomposition into CO2 as a side reaction that showed by co-feeding of light alcohol (with 14C) to FTS in previous works. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...] [article] Catalytic behaviors of bifunctional Fe-HZSM-5 catalyst in Fischer–Tropsch synthesis [texte imprimé] / Ali Nakhaei Pour, Auteur ; Masoud Zare, Auteur ; Seyed Mehdi Kamali Shahri, Auteur . - pp. 183-189. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 1 N° 6 (Décembre 2009) . - pp. 183-189 Mots-clés : Iron  catalyst  HZSM-5  zeolite  Bifunctional  catalyst  Fischer–Tropsch  synthesis Index. décimale : 665.7 Résumé : Fe-HZSM-5 bifunctional catalyst activity and products selectivity in Fischer–Tropsch synthesis (FTS) were investigated. HZSM-5 zeolite and iron catalyst were become near to each other step-by-step. In first step, zeolite just affected gaseous products after FTS reaction on iron catalyst. In other conditions, zeolite was incorporated in FTS process to be included in cracking and aromatization reactions. The results revealed that role of zeolite in overall reaction were increased from completely separated condition to physically mixed condition. Addition of binder in physically mixed condition was led to cover the active sites of bifunctional iron–zeolite catalyst and decrease activity of zeolite and iron catalyst. Also, decreasing amounts of Brønsted acid sites after FT reaction was related to zeolite incorporation in overall reaction that was decreased by closing the zeolite to the iron catalyst. HZSM-5 addition to FT catalyst suppressed the formation of oxygenates, which are converted to hydrocarbons on the zeolite acid sites. Furthermore, zeolite increased CO2 selectivity slightly because of oxygenate decomposition into CO2 as a side reaction that showed by co-feeding of light alcohol (with 14C) to FTS in previous works. DEWEY : 665.7 ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%2356453%2 [...]

Kinetic studies of the Fischer–Tropsch synthesis over La, Mg and Ca promoted nano-structured iron catalyst / Ali Nakhaei Pour in Journal of natural gas science and engineering, Vol. 2 N° 2-3 (Juillet 2010) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 2 N° 2-3 (Juillet 2010) . - pp. 61–68 Titre : Kinetic studies of the Fischer–Tropsch synthesis over La, Mg and Ca promoted nano-structured iron catalyst Type de document : texte imprimé Auteurs : Ali Nakhaei Pour, Auteur ; Mohammad Reza Housaindokht, Auteur ; Sayyed Faramarz Tayyari, Auteur Année de publication : 2012 Article en page(s) : pp. 61–68 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Fischer–Tropsch  synthesis  Iron-based  catalyst  Kinetic  parameters  Nano  particles  Microemulsion  Promoter Résumé : The kinetic of the Fischer–Tropsch synthesis (FTS) over nano-structured iron catalyst promoted with Mg, La and Ca, was studied in a continuous spinning basket reactor. Fe/Cu/Si nano-structured catalyst was prepared by co-precipitation in a water-in-oil microemulsion. The results indicated that both the rate constant (k) and the adsorption parameter (b) in a common two-parameter Fischer–Tropsch rate expression decreased with increasing the catalyst surface basicity. Since decreases in rate constant (k) and the adsorption parameter (b) affected the FTS rate in reverse direction, the basicity of catalyst surface showed complicated effects on kinetic parameters of FTS reaction. The optimum promoter would be one that its rate constant (k) should not be too low and its adsorption parameter (b) should not be too high. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000132 [article] Kinetic studies of the Fischer–Tropsch synthesis over La, Mg and Ca promoted nano-structured iron catalyst [texte imprimé] / Ali Nakhaei Pour, Auteur ; Mohammad Reza Housaindokht, Auteur ; Sayyed Faramarz Tayyari, Auteur . - 2012 . - pp. 61–68. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 2 N° 2-3 (Juillet 2010) . - pp. 61–68 Mots-clés : Fischer–Tropsch  synthesis  Iron-based  catalyst  Kinetic  parameters  Nano  particles  Microemulsion  Promoter Résumé : The kinetic of the Fischer–Tropsch synthesis (FTS) over nano-structured iron catalyst promoted with Mg, La and Ca, was studied in a continuous spinning basket reactor. Fe/Cu/Si nano-structured catalyst was prepared by co-precipitation in a water-in-oil microemulsion. The results indicated that both the rate constant (k) and the adsorption parameter (b) in a common two-parameter Fischer–Tropsch rate expression decreased with increasing the catalyst surface basicity. Since decreases in rate constant (k) and the adsorption parameter (b) affected the FTS rate in reverse direction, the basicity of catalyst surface showed complicated effects on kinetic parameters of FTS reaction. The optimum promoter would be one that its rate constant (k) should not be too low and its adsorption parameter (b) should not be too high. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000132

Water-gas-shift kinetic over nano-structured iron catalyst in Fischer–Tropsch synthesis / Ali Nakhaei Pour in Journal of natural gas science and engineering, Vol. 2 N° 2-3 (Juillet 2010) 

Public ISBD [article]  in Journal of natural gas science and engineering > Vol. 2 N° 2-3 (Juillet 2010) . - pp. 79–85 Titre : Water-gas-shift kinetic over nano-structured iron catalyst in Fischer–Tropsch synthesis Type de document : texte imprimé Auteurs : Ali Nakhaei Pour, Auteur ; Mohammad Reza Housaindokht, Auteur ; Jamshid Zarkesh, Auteur Année de publication : 2012 Article en page(s) : pp. 79–85 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Fischer–Tropsch  synthesis  Water-gas-shift  reaction  Iron  catalyst  Kinetics Résumé : Kinetic modeling of the water-gas-shift (WGS) reaction over a nano-structured iron catalyst under Fischer–Tropsch synthesis (FTS) reaction conditions is investigated. The Fe/Cu/La/Si nano-structured catalyst was prepared by co-precipitation in a water-in-oil microemulsion. A number of Langmuir–Hinshelwood–Hougen–Watson type rate equations based on possible reactions sets originated from the formate and direct oxidation mechanisms, are derived. By considering experimental data measured over a wide range of reaction conditions, discrimination between the various rate equations is investigated during this study. WGS rate expressions based on the formate mechanism were found to provide an improved description of the WGS kinetic data. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000272 [article] Water-gas-shift kinetic over nano-structured iron catalyst in Fischer–Tropsch synthesis [texte imprimé] / Ali Nakhaei Pour, Auteur ; Mohammad Reza Housaindokht, Auteur ; Jamshid Zarkesh, Auteur . - 2012 . - pp. 79–85. Génie Chimique Langues : Anglais (eng) in Journal of natural gas science and engineering > Vol. 2 N° 2-3 (Juillet 2010) . - pp. 79–85 Mots-clés : Fischer–Tropsch  synthesis  Water-gas-shift  reaction  Iron  catalyst  Kinetics Résumé : Kinetic modeling of the water-gas-shift (WGS) reaction over a nano-structured iron catalyst under Fischer–Tropsch synthesis (FTS) reaction conditions is investigated. The Fe/Cu/La/Si nano-structured catalyst was prepared by co-precipitation in a water-in-oil microemulsion. A number of Langmuir–Hinshelwood–Hougen–Watson type rate equations based on possible reactions sets originated from the formate and direct oxidation mechanisms, are derived. By considering experimental data measured over a wide range of reaction conditions, discrimination between the various rate equations is investigated during this study. WGS rate expressions based on the formate mechanism were found to provide an improved description of the WGS kinetic data. ISSN : 1875-5100 En ligne : http://www.sciencedirect.com/science/article/pii/S1875510010000272