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Loading and aging effects in exhaust gas after - treatment catalysts with Pt As active component / Willi Boll in Industrial & engineering chemistry research, Vol. 49 N° 21 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10303-10310 Titre : Loading and aging effects in exhaust gas after - treatment catalysts with Pt As active component Type de document : texte imprimé Auteurs : Willi Boll, Auteur ; Steffen Tischer, Auteur ; Olaf Deutschmann, Auteur Année de publication : 2011 Article en page(s) : pp. 10303-10310 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  Exhaust  gas  Loading Résumé : Abatement of pollutant emissions over platinum-containing catalytic converters of lean operated engines is studied. Several close-to-production model catalysts with varying platinum loading and hydrothermal aging procedures are characterized by BET, HR-SEM, HR-TEM, and CO-TPD. Pollutant conversion is numerically investigated in an isothermal flat bed reactor using varying lean exhaust-gas mixtures and temperatures. The performance of the monolithic catalysts is modeled by a two-dimensional flow field description of a single channel coupled with models for washcoat diffusion and multistep reaction mechanisms. An optimizing procedure is presented which allows adaption of kinetic parameters for slightly different catalysts. The catalytic active surface area of the catalyst determined by CO-TPD can serve as parameter to model the varying noble metal loading and consequences of hydrothermal aging without any adaption of the kinetic data included in the reaction mechanism. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447921 [article] Loading and aging effects in exhaust gas after - treatment catalysts with Pt As active component [texte imprimé] / Willi Boll, Auteur ; Steffen Tischer, Auteur ; Olaf Deutschmann, Auteur . - 2011 . - pp. 10303-10310. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10303-10310 Mots-clés : Catalyst  Exhaust  gas  Loading Résumé : Abatement of pollutant emissions over platinum-containing catalytic converters of lean operated engines is studied. Several close-to-production model catalysts with varying platinum loading and hydrothermal aging procedures are characterized by BET, HR-SEM, HR-TEM, and CO-TPD. Pollutant conversion is numerically investigated in an isothermal flat bed reactor using varying lean exhaust-gas mixtures and temperatures. The performance of the monolithic catalysts is modeled by a two-dimensional flow field description of a single channel coupled with models for washcoat diffusion and multistep reaction mechanisms. An optimizing procedure is presented which allows adaption of kinetic parameters for slightly different catalysts. The catalytic active surface area of the catalyst determined by CO-TPD can serve as parameter to model the varying noble metal loading and consequences of hydrothermal aging without any adaption of the kinetic data included in the reaction mechanism. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447921