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Dynamics of a combined DOC - NSRC - SCR exhaust gas aftertreatment system with periodic regenerations / Frantisek Plat 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. 10348-10357 Titre : Dynamics of a combined DOC - NSRC - SCR exhaust gas aftertreatment system with periodic regenerations Type de document : texte imprimé Auteurs : Frantisek Plat, Auteur ; Sarka Bartova, Auteur ; Jan Stepanek, Auteur Année de publication : 2011 Article en page(s) : pp. 10348-10357 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Exhaust  gas  Selective  catalytic  reduction  Dissolved  organic  carbon Résumé : A combined exhaust gas aftertreatment system, consisting of a diesel oxidation catalyst (DOC), an NOx storage and reduction catalyst (NSRC, which also is called lean NO, trap, LNT), and a catalyst for selective catalytic reduction of NO, by NH3 (NH3-SCR) is studied experimentally. The catalyst samples are placed in series in an almost isothermal laboratory minireactor. Dynamic behavior of the system is examined under periodic lean/rich operation in temperature range of 200-400 °C with varying composition of the rich mixture, containing CO, H2 and C3H6. Concentrations of gas components are measured at the inlet, outlet, and between the individual catalysts. The individual DOC, NSRC, SCR, NSRC-SCR, and DOC-NSRC subsystems are also examined. The DOC is used as the first element in the exhaust aftertreatment line. It is responsible for the oxidation of CO and unburned hydrocarbons (HC), and it also supports the oxidation of NO to NO2. NSRC and SCR converters are employed for the abatement of nitrogen oxides. A significant amount of NH3 can be formed in the NSRC as a byproduct of the NO, reduction, depending on the regeneration phase length, temperature, and gas composition. The generated ammonia is adsorbed in the SCR and used for additional NO, reduction. The dynamics of the combined system is investigated, and the conversions, selectivities, and reaction mechanisms in each converter, as well as mutual synergic and competitive effects, are discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447926 [article] Dynamics of a combined DOC - NSRC - SCR exhaust gas aftertreatment system with periodic regenerations [texte imprimé] / Frantisek Plat, Auteur ; Sarka Bartova, Auteur ; Jan Stepanek, Auteur . - 2011 . - pp. 10348-10357. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 21 (Novembre 2010) . - pp. 10348-10357 Mots-clés : Exhaust  gas  Selective  catalytic  reduction  Dissolved  organic  carbon Résumé : A combined exhaust gas aftertreatment system, consisting of a diesel oxidation catalyst (DOC), an NOx storage and reduction catalyst (NSRC, which also is called lean NO, trap, LNT), and a catalyst for selective catalytic reduction of NO, by NH3 (NH3-SCR) is studied experimentally. The catalyst samples are placed in series in an almost isothermal laboratory minireactor. Dynamic behavior of the system is examined under periodic lean/rich operation in temperature range of 200-400 °C with varying composition of the rich mixture, containing CO, H2 and C3H6. Concentrations of gas components are measured at the inlet, outlet, and between the individual catalysts. The individual DOC, NSRC, SCR, NSRC-SCR, and DOC-NSRC subsystems are also examined. The DOC is used as the first element in the exhaust aftertreatment line. It is responsible for the oxidation of CO and unburned hydrocarbons (HC), and it also supports the oxidation of NO to NO2. NSRC and SCR converters are employed for the abatement of nitrogen oxides. A significant amount of NH3 can be formed in the NSRC as a byproduct of the NO, reduction, depending on the regeneration phase length, temperature, and gas composition. The generated ammonia is adsorbed in the SCR and used for additional NO, reduction. The dynamics of the combined system is investigated, and the conversions, selectivities, and reaction mechanisms in each converter, as well as mutual synergic and competitive effects, are discussed. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=23447926