Documents disponibles écrits par cet auteur

Simultaneous ammonia and toluene decomposition on tungsten-based catalysts for hot gas cleanup / Sourabh S. Pansare 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. 8602–8611 Titre : Simultaneous ammonia and toluene decomposition on tungsten-based catalysts for hot gas cleanup Type de document : texte imprimé Auteurs : Sourabh S. Pansare, Auteur ; James G. Goodwin, Auteur ; Santosh Gangwal, Auteur Année de publication : 2008 Article en page(s) : p. 8602–8611 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ammonia  Toluene  Catalysts  Gas  cleanup Résumé : The current paper reports the results of a study of the simultaneous decomposition of NH3 and toluene on sulfur tolerant nonconventional tungsten-based catalysts [tungsten carbide (WC) and tungstated zirconia (WZ)] at temperatures <750 °C in the presence of H2, CO, CO2, and H2O, such as it would be present in hot gas cleanup following biomass gasification. Toluene was chosen as a model compound to represent tars. The effects of addition of each gasification gas component on the activities of WC and WZ for NH3 and toluene decomposition were investigated. The NH3 and toluene decomposition reactions were conducted at typical hot gas cleanup conditions of 700 °C and 1 atm. In the absence of gasification gases, low activities were observed for toluene decomposition on WC and WZ while complete conversion of 4000 ppm of NH3 was observed at space velocities of 5 800 000 and 385 000 h−1 for WC and WZ, respectively. The presence of H2, CO, CO2, and H2O had a somewhat negative impact on the high activities of WC and WZ for NH3 decomposition while it had a positive impact on the toluene decomposition activities of both the catalysts. However, both WC and WZ were active for the simultaneous removal of NH3 and toluene in the presence of H2, CO, CO2, and H2O. In the presence of gasification gases, both WC and WZ showed comparable performances for toluene decomposition on a “per-g-catalyst” basis with that of a commercial ultrastable Y zeolite (USY). However, on a “per-m2-catalyst” basis, WC showed by far the highest activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800525c [article] Simultaneous ammonia and toluene decomposition on tungsten-based catalysts for hot gas cleanup [texte imprimé] / Sourabh S. Pansare, Auteur ; James G. Goodwin, Auteur ; Santosh Gangwal, Auteur . - 2008 . - p. 8602–8611. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°22 (Novembre 2008) . - p. 8602–8611 Mots-clés : Ammonia  Toluene  Catalysts  Gas  cleanup Résumé : The current paper reports the results of a study of the simultaneous decomposition of NH3 and toluene on sulfur tolerant nonconventional tungsten-based catalysts [tungsten carbide (WC) and tungstated zirconia (WZ)] at temperatures <750 °C in the presence of H2, CO, CO2, and H2O, such as it would be present in hot gas cleanup following biomass gasification. Toluene was chosen as a model compound to represent tars. The effects of addition of each gasification gas component on the activities of WC and WZ for NH3 and toluene decomposition were investigated. The NH3 and toluene decomposition reactions were conducted at typical hot gas cleanup conditions of 700 °C and 1 atm. In the absence of gasification gases, low activities were observed for toluene decomposition on WC and WZ while complete conversion of 4000 ppm of NH3 was observed at space velocities of 5 800 000 and 385 000 h−1 for WC and WZ, respectively. The presence of H2, CO, CO2, and H2O had a somewhat negative impact on the high activities of WC and WZ for NH3 decomposition while it had a positive impact on the toluene decomposition activities of both the catalysts. However, both WC and WZ were active for the simultaneous removal of NH3 and toluene in the presence of H2, CO, CO2, and H2O. In the presence of gasification gases, both WC and WZ showed comparable performances for toluene decomposition on a “per-g-catalyst” basis with that of a commercial ultrastable Y zeolite (USY). However, on a “per-m2-catalyst” basis, WC showed by far the highest activity. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800525c

Toluene decomposition in the presence of hydrogen on tungsten-based catalysts / Sourabh S. Pansare in Industrial & engineering chemistry research, Vol. 47 n°12 (Juin 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4077–4085 Titre : Toluene decomposition in the presence of hydrogen on tungsten-based catalysts Type de document : texte imprimé Auteurs : Sourabh S. Pansare, Auteur ; James G. GoodwinJr., Auteur ; Santosh Gangwal, Auteur Année de publication : 2008 Article en page(s) : p. 4077–4085 Note générale : Bibliogr. p. 4084-4085 Langues : Anglais (eng) Mots-clés : Toluene;  Tungstated  zirconia;  Tungsten  carbide Résumé : Removal of NH3, tars, and H2S from biomass gasification gas represents a significant step in the commercial use of biomass gasification as a source of hydrogen, syngas, and electricity. This paper reports the results of an investigation into the use of W-based catalysts [tungsten carbide (WC), tungstated zirconia (WZ), and platinum supported on tungstated zirconia (PtWZ)] for catalytic tar removal. In this study, toluene was used as a model compound for tars. In the case of WZ, the effect of calcination temperature on the activity of toluene decomposition was also investigated. The toluene decomposition reaction was conducted at 1 atm, in the temperature range of 300−800 °C, and in the presence of 10% H2. CH4 and benzene were the only detectable products of toluene decomposition on all the catalysts. Incorporation of 5 wt % Pt with WZ was found to give the most effective catalyst considering initial rates of product formation. WC, WZ, and PtWZ each showed an initial partial deactivation for both CH4 and benzene formation due to coke deposition on active sites. Pt incorporation had a significant effect on the steady-state activity of WZ for toluene decomposition at temperatures below 600 °C; however, at temperatures above 700 °C, the effect was nullified. All W-based catalysts showed comparable performance to that of a commercial cracking catalyst (ultra-stable Y zeolite) above 700 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002864 [article] Toluene decomposition in the presence of hydrogen on tungsten-based catalysts [texte imprimé] / Sourabh S. Pansare, Auteur ; James G. GoodwinJr., Auteur ; Santosh Gangwal, Auteur . - 2008 . - p. 4077–4085. Bibliogr. p. 4084-4085 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°12 (Juin 2008) . - p. 4077–4085 Mots-clés : Toluene;  Tungstated  zirconia;  Tungsten  carbide Résumé : Removal of NH3, tars, and H2S from biomass gasification gas represents a significant step in the commercial use of biomass gasification as a source of hydrogen, syngas, and electricity. This paper reports the results of an investigation into the use of W-based catalysts [tungsten carbide (WC), tungstated zirconia (WZ), and platinum supported on tungstated zirconia (PtWZ)] for catalytic tar removal. In this study, toluene was used as a model compound for tars. In the case of WZ, the effect of calcination temperature on the activity of toluene decomposition was also investigated. The toluene decomposition reaction was conducted at 1 atm, in the temperature range of 300−800 °C, and in the presence of 10% H2. CH4 and benzene were the only detectable products of toluene decomposition on all the catalysts. Incorporation of 5 wt % Pt with WZ was found to give the most effective catalyst considering initial rates of product formation. WC, WZ, and PtWZ each showed an initial partial deactivation for both CH4 and benzene formation due to coke deposition on active sites. Pt incorporation had a significant effect on the steady-state activity of WZ for toluene decomposition at temperatures below 600 °C; however, at temperatures above 700 °C, the effect was nullified. All W-based catalysts showed comparable performance to that of a commercial cracking catalyst (ultra-stable Y zeolite) above 700 °C. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8002864