Documents disponibles écrits par cet auteur

Impact of sulfur poisoning on the catalytic partial oxidation of methane on rhodium - based catalysts / Stefano Cimino in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7459–7466 Titre : Impact of sulfur poisoning on the catalytic partial oxidation of methane on rhodium - based catalysts Type de document : texte imprimé Auteurs : Stefano Cimino, Auteur ; Luciana Lisi, Auteur Année de publication : 2012 Article en page(s) : pp. 7459–7466 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalytic  partial  oxidation  Natural  gas Résumé : Catalytic partial oxidation (CPO) of natural gas into syngas (CO and H2) at short contact time over precious-metal-structured reactors has received increasing attention in industrial applications. However, only recently, sulfur poisoning of the best-performing and costly rhodium catalysts has been recognized as a serious issue of this technology. This work critically reviews and integrates recent experimental results obtained from our group and others, both at steady state and during transient operation of the CPO reactor, particularly with regard to poisoning/regeneration cycles and low-temperature light-off phase. Furthermore, the origin of sulfur poisoning of Rh active sites during the CPO of methane has been studied via in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, using CO as a probe molecule, and an attempt is made to identify sites responsible for the loss in the catalytic activity by comparing the results with the activity data. The effect of the type of alumina support and the partial substitution of Rh with either Pt or Pd were investigated to enhance the sulfur tolerance of the catalyst. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201648e [article] Impact of sulfur poisoning on the catalytic partial oxidation of methane on rhodium - based catalysts [texte imprimé] / Stefano Cimino, Auteur ; Luciana Lisi, Auteur . - 2012 . - pp. 7459–7466. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7459–7466 Mots-clés : Catalytic  partial  oxidation  Natural  gas Résumé : Catalytic partial oxidation (CPO) of natural gas into syngas (CO and H2) at short contact time over precious-metal-structured reactors has received increasing attention in industrial applications. However, only recently, sulfur poisoning of the best-performing and costly rhodium catalysts has been recognized as a serious issue of this technology. This work critically reviews and integrates recent experimental results obtained from our group and others, both at steady state and during transient operation of the CPO reactor, particularly with regard to poisoning/regeneration cycles and low-temperature light-off phase. Furthermore, the origin of sulfur poisoning of Rh active sites during the CPO of methane has been studied via in situ diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy, using CO as a probe molecule, and an attempt is made to identify sites responsible for the loss in the catalytic activity by comparing the results with the activity data. The effect of the type of alumina support and the partial substitution of Rh with either Pt or Pd were investigated to enhance the sulfur tolerance of the catalyst. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201648e

Thermochemical stability of alumina - supported Rh - LaCoO3 catalysts for Tar conversion / Paola Ammendola in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7475–7481 Titre : Thermochemical stability of alumina - supported Rh - LaCoO3 catalysts for Tar conversion Type de document : texte imprimé Auteurs : Paola Ammendola, Auteur ; Elena Cammisa, Auteur ; Luciana Lisi, Auteur Année de publication : 2012 Article en page(s) : pp. 7475–7481 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalysts  thermal  chemical  stability Résumé : The thermal and chemical stability of alumina-supported catalysts (Rh/Al2O3, LaCoO3/Al2O3, Rh-LaCoO3/Al2O3) have been investigated by performing cycles of tar conversion at 700 °C followed by regeneration of the catalyst by oxidation of coke deposited on the surface up to 800 °C. Structural and chemical modifications underwent by the catalysts upon conversion/regeneration cycles have been studied by BET, TPR/TPO, and DRIFT analyses. The catalysts containing rhodium are highly stable maintaining the original performance and chemical properties of the fresh sample also after several cycles, dispersion of rhodium on Al2O3 surface being sufficiently preserved also at 800 °C. On the contrary, LaCoO3/Al2O3 catalyst undergoes a partial deactivation after the first cycles related to the irreversible migration of cobalt into the alumina lattice. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2016448 [article] Thermochemical stability of alumina - supported Rh - LaCoO3 catalysts for Tar conversion [texte imprimé] / Paola Ammendola, Auteur ; Elena Cammisa, Auteur ; Luciana Lisi, Auteur . - 2012 . - pp. 7475–7481. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7475–7481 Mots-clés : Catalysts  thermal  chemical  stability Résumé : The thermal and chemical stability of alumina-supported catalysts (Rh/Al2O3, LaCoO3/Al2O3, Rh-LaCoO3/Al2O3) have been investigated by performing cycles of tar conversion at 700 °C followed by regeneration of the catalyst by oxidation of coke deposited on the surface up to 800 °C. Structural and chemical modifications underwent by the catalysts upon conversion/regeneration cycles have been studied by BET, TPR/TPO, and DRIFT analyses. The catalysts containing rhodium are highly stable maintaining the original performance and chemical properties of the fresh sample also after several cycles, dispersion of rhodium on Al2O3 surface being sufficiently preserved also at 800 °C. On the contrary, LaCoO3/Al2O3 catalyst undergoes a partial deactivation after the first cycles related to the irreversible migration of cobalt into the alumina lattice. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2016448