Carbon nanotube-supported metal catalysts for NOx reduction using hydrocarbon reductants / Eduardo Santillan - Jimenez in Industrial & engineering chemistry research, Vol. 50 N° 12 (Juin 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp.7191-7200. Titre : Carbon nanotube-supported metal catalysts for NOx reduction using hydrocarbon reductants : gas switching and adsorption studies Type de document : texte imprimé Auteurs : Eduardo Santillan - Jimenez, Auteur ; Mark Crocker, Auteur ; Agustin Bueno - Lopez, Auteur Année de publication : 2011 Article en page(s) : pp.7191-7200. Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Carbon nanotube Catalysts Résumé : The selective catalytic reduction of NOx with hydrocarbons (HC-SCR) on functionalized multiwalled carbon nanotube (fMWCNT)-supported metal catalysts was investigated using a transient technique, together with kinetic and adsorption measurements. Results from the transient studies provide an explanation for the characteristic volcano shape of the NOx conversion curves: below Tmax, the temperature of maximum NOx conversion, the catalyst surface is covered by hydrocarbonaceous species, which results in the suppression of NOx reduction activity. Above Tmax, O2 adsorption becomes prevalent, favoring oxidation of both NO and the hydrocarbon. In an effort to understand the origin of the superior NOx reduction activity shown by 3:1 Pt–Rh/fMWCNTs as compared to Pt/fMWCNTs, Temperature Programmed Desorption (TPD) measurements were undertaken. Results indicate that hydrocarbon and/or hydrocarbon-derived species are more strongly adsorbed on the alloy than on Pt alone, while NO adsorption is weaker on the alloy than on Pt. This is suggested to give rise to a higher concentration of partially oxidized hydrocarbon intermediates on the surface of the Pt–Rh catalyst at the temperature of maximum deNOx activity, leading to higher NOx reduction activity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200054u [article] Carbon nanotube-supported metal catalysts for NOx reduction using hydrocarbon reductants : gas switching and adsorption studies [texte imprimé] / Eduardo Santillan - Jimenez, Auteur ; Mark Crocker, Auteur ; Agustin Bueno - Lopez, Auteur . - 2011 . - pp.7191-7200. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 12 (Juin 2011) . - pp.7191-7200. Mots-clés : Carbon nanotube Catalysts Résumé : The selective catalytic reduction of NOx with hydrocarbons (HC-SCR) on functionalized multiwalled carbon nanotube (fMWCNT)-supported metal catalysts was investigated using a transient technique, together with kinetic and adsorption measurements. Results from the transient studies provide an explanation for the characteristic volcano shape of the NOx conversion curves: below Tmax, the temperature of maximum NOx conversion, the catalyst surface is covered by hydrocarbonaceous species, which results in the suppression of NOx reduction activity. Above Tmax, O2 adsorption becomes prevalent, favoring oxidation of both NO and the hydrocarbon. In an effort to understand the origin of the superior NOx reduction activity shown by 3:1 Pt–Rh/fMWCNTs as compared to Pt/fMWCNTs, Temperature Programmed Desorption (TPD) measurements were undertaken. Results indicate that hydrocarbon and/or hydrocarbon-derived species are more strongly adsorbed on the alloy than on Pt alone, while NO adsorption is weaker on the alloy than on Pt. This is suggested to give rise to a higher concentration of partially oxidized hydrocarbon intermediates on the surface of the Pt–Rh catalyst at the temperature of maximum deNOx activity, leading to higher NOx reduction activity. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200054u

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