Pathways for N2 and N2O formation during the reduction of NOx over Pt – Ba/Al2O3 LNT catalysts investigated by labeling isotopic experiments / L. Lietti in Industrial & engineering chemistry research, Vol. 51 N° 22 (Juin 2012)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7597-7605 Titre : Pathways for N2 and N2O formation during the reduction of NOx over Pt – Ba/Al2O3 LNT catalysts investigated by labeling isotopic experiments Type de document : texte imprimé Auteurs : L. Lietti, Auteur ; N. Artioli, Auteur ; L. Righini, Auteur Année de publication : 2012 Article en page(s) : pp. 7597-7605 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalyst Résumé : Mechanistic aspects involved in the formation of N2 and of N2O during the reduction of gas-phase NO and of NOx stored over a model PtBa/Al2O3 NSR catalyst are investigated using unlabeled ammonia and labeled NO. The reduction of the stored NOx species (labeled nitrites and nitrates) with NH3 leads to the selective formation of N2 as a major product and of small amounts of nitrous oxide. Based on the nitrogen isotopic distribution, it appears that N2 formation occurs primarily through the statistical coupling of N-atoms formed by dissociation of NOx- and NH3-related surface intermediates, although an SCR- pathway (involving the coupling of NH3- and NO-derived ad-species) is also likely to occur. It appears as well that the formation of nitrous oxide involves either the coupling of two adsorbed NO molecules or the recombination of an adsorbed NO molecule with an adsorbed NHx fragment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968313 [article] Pathways for N2 and N2O formation during the reduction of NOx over Pt – Ba/Al2O3 LNT catalysts investigated by labeling isotopic experiments [texte imprimé] / L. Lietti, Auteur ; N. Artioli, Auteur ; L. Righini, Auteur . - 2012 . - pp. 7597-7605. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 22 (Juin 2012) . - pp. 7597-7605 Mots-clés : Catalyst Résumé : Mechanistic aspects involved in the formation of N2 and of N2O during the reduction of gas-phase NO and of NOx stored over a model PtBa/Al2O3 NSR catalyst are investigated using unlabeled ammonia and labeled NO. The reduction of the stored NOx species (labeled nitrites and nitrates) with NH3 leads to the selective formation of N2 as a major product and of small amounts of nitrous oxide. Based on the nitrogen isotopic distribution, it appears that N2 formation occurs primarily through the statistical coupling of N-atoms formed by dissociation of NOx- and NH3-related surface intermediates, although an SCR- pathway (involving the coupling of NH3- and NO-derived ad-species) is also likely to occur. It appears as well that the formation of nitrous oxide involves either the coupling of two adsorbed NO molecules or the recombination of an adsorbed NO molecule with an adsorbed NHx fragment. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25968313

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