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Pt−sn-based SAPO-34 supported novel catalyst for n-butane dehydrogenation / Zeeshan Nawaz in Industrial & engineering chemistry research, Vol. 48 N° 15 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7442–7447 Titre : Pt−sn-based SAPO-34 supported novel catalyst for n-butane dehydrogenation Type de document : texte imprimé Auteurs : Zeeshan Nawaz, Auteur ; Wei Fei, Auteur Année de publication : 2009 Article en page(s) : pp. 7442–7447 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Pt−Sn/SAPO-34  novel  catalyst  n-butane  dehydrogenation  X-ray  fluorescence  X-ray  diffraction Résumé : The performance of Pt−Sn/SAPO-34 novel catalyst was investigated for n-butane dehydrogenation. The catalyst was characterized by number of physiochemical techniques X-ray fluorescence (XRF), X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH3-TPD), hydrogen temperature-programmed reduction (H2-TPR), temperature-programmed oxidation (TPO), transmission electron microscopy (TEM), and O2-pulse coke measurement. The metallic contents, structure, acidity, and metallic dispersion were determined in order to explain catalyst superiority and functionality using SAPO-34 as support. Pt−Sn-based SAPO-34 supported catalyst was parametrically characterized in order to obtain superior control of dehydrogenation reaction stereochemistry. Above 91% of total olefins with 80% butene was achieved over Pt−Sn/SAPO-34. The weight hourly space velocity 2.8 h−1 and temperature 585 °C were found to be optimum for the higher dehydrogenation activity. The catalysts also showed very good hydrothermal stability in continuous reaction−regeneration cycles. The coke formation was mainly related to catalyst activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900801m [article] Pt−sn-based SAPO-34 supported novel catalyst for n-butane dehydrogenation [texte imprimé] / Zeeshan Nawaz, Auteur ; Wei Fei, Auteur . - 2009 . - pp. 7442–7447. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 15 (Août 2009) . - pp. 7442–7447 Mots-clés : Pt−Sn/SAPO-34  novel  catalyst  n-butane  dehydrogenation  X-ray  fluorescence  X-ray  diffraction Résumé : The performance of Pt−Sn/SAPO-34 novel catalyst was investigated for n-butane dehydrogenation. The catalyst was characterized by number of physiochemical techniques X-ray fluorescence (XRF), X-ray diffraction (XRD), ammonia temperature-programmed desorption (NH3-TPD), hydrogen temperature-programmed reduction (H2-TPR), temperature-programmed oxidation (TPO), transmission electron microscopy (TEM), and O2-pulse coke measurement. The metallic contents, structure, acidity, and metallic dispersion were determined in order to explain catalyst superiority and functionality using SAPO-34 as support. Pt−Sn-based SAPO-34 supported catalyst was parametrically characterized in order to obtain superior control of dehydrogenation reaction stereochemistry. Above 91% of total olefins with 80% butene was achieved over Pt−Sn/SAPO-34. The weight hourly space velocity 2.8 h−1 and temperature 585 °C were found to be optimum for the higher dehydrogenation activity. The catalysts also showed very good hydrothermal stability in continuous reaction−regeneration cycles. The coke formation was mainly related to catalyst activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900801m

Study on the FCC process of a novel riser−downer coupling reactor (III) / Fei Liu ; Wei Fei ; Guoliang Li in Industrial & engineering chemistry research, Vol. 47 n°22 (Novembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8582–8587 Titre : Study on the FCC process of a novel riser−downer coupling reactor (III) : industrial trial and CFD modeling Type de document : texte imprimé Auteurs : Fei Liu, Auteur ; Wei Fei, Auteur ; Guoliang Li, Auteur Année de publication : 2008 Article en page(s) : p. 8582–8587 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Industrial  Trial  CFD  Modeling Résumé : Industrial trials detailed in a riser−downer coupling reactor proposed for the fluid catalytic cracking (FCC) process are presented in this paper. The trials are based on the fundamental research of hydrodynamics, mixing behaviors, and laboratory-scale hot experiments described in our previous investigations. Compared with the riser reactor with the same feeds and catalyst, the LPG and propylene yield increased by 8.15 and 4.30 wt %, respectively. The gasoline octane number likewise reached 94.8 with 28 wt % olefin content. However, dry gas is significantly suppressed, and the coke has little change in yield even with the increased catalyst to oil ratio. With some gasoline recycling, the LPG and propylene yield increased by 11.45 and 5.06 wt %, respectively, and the olefin content in gasoline significantly decreased to 22 wt %; the high octane number (95.4) is maintained. The computational fluid dynamics (CFD) coupled with a 6-lump kinetic model is also applied to simulate the FCC process for the industrial trials. The yield of propylene and butylene and the temperature profile along the axis direction demonstrated consistency between the simulation results and the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800645y [article] Study on the FCC process of a novel riser−downer coupling reactor (III) : industrial trial and CFD modeling [texte imprimé] / Fei Liu, Auteur ; Wei Fei, Auteur ; Guoliang Li, Auteur . - 2008 . - p. 8582–8587. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8582–8587 Mots-clés : Industrial  Trial  CFD  Modeling Résumé : Industrial trials detailed in a riser−downer coupling reactor proposed for the fluid catalytic cracking (FCC) process are presented in this paper. The trials are based on the fundamental research of hydrodynamics, mixing behaviors, and laboratory-scale hot experiments described in our previous investigations. Compared with the riser reactor with the same feeds and catalyst, the LPG and propylene yield increased by 8.15 and 4.30 wt %, respectively. The gasoline octane number likewise reached 94.8 with 28 wt % olefin content. However, dry gas is significantly suppressed, and the coke has little change in yield even with the increased catalyst to oil ratio. With some gasoline recycling, the LPG and propylene yield increased by 11.45 and 5.06 wt %, respectively, and the olefin content in gasoline significantly decreased to 22 wt %; the high octane number (95.4) is maintained. The computational fluid dynamics (CFD) coupled with a 6-lump kinetic model is also applied to simulate the FCC process for the industrial trials. The yield of propylene and butylene and the temperature profile along the axis direction demonstrated consistency between the simulation results and the experimental data. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800645y