A kinetic model for the selective catalytic reduction of NOx with NH3 over an fe−zeolite catalyst / Hanna Sjövall in Industrial & engineering chemistry research, Vol. 49 N° 1 (Janvier 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 39–52 Titre : A kinetic model for the selective catalytic reduction of NOx with NH3 over an fe−zeolite catalyst Type de document : texte imprimé Auteurs : Hanna Sjövall, Auteur ; Richard J. Blint, Auteur ; Ashok Gopinath, Auteur Année de publication : 2010 Article en page(s) : pp. 39–52 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : A Kinetic Model for the Selective Catalytic Reduction of NOx with NH3 over an Fe−  zeolite Catalyst Résumé : The selective catalytic reduction of NOx with ammonia over an Fe−zeolite catalyst was investigated experimentally and a transient kinetic model was developed. The model includes reactions that describe ammonia storage and oxidation, NO oxidation, selective catalytic reduction (SCR) of NO and NO2, formation of N2O, ammonia inhibition and ammonium nitrate formation. The model can account for a broad range of experimental conditions in the presence of H2O, CO2, and O2 at temperatures from 150 to 650 °C. The catalyst stores ammonia at temperatures up to 400 °C and shows ammonia oxidation activity from 350 °C. The catalyst is also active for the oxidation of NO to NO2 and the oxidation reaches equilibrium at 500 °C. The SCR of NO is already active at 150 °C and the introduction of equal amounts of NO and NO2 greatly enhances the conversion of NOx at temperatures up to 300 °C. The formation of N2O is negligible if small fractions of NO2 are fed to the reactor, but a significant amount of N2O is formed at high NO2 to NO ratios. An ammonia inhibition on the SCR of NO is observed at 200 °C. This kinetic model contains 12 reactions and is able to describe the experimental results well. The model was validated using short transient experiments and experimental conditions not used in the parameter estimation and predicted these new conditions adequately. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003464 [article] A kinetic model for the selective catalytic reduction of NOx with NH3 over an fe−zeolite catalyst [texte imprimé] / Hanna Sjövall, Auteur ; Richard J. Blint, Auteur ; Ashok Gopinath, Auteur . - 2010 . - pp. 39–52. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 1 (Janvier 2010) . - pp. 39–52 Mots-clés : A Kinetic Model for the Selective Catalytic Reduction of NOx with NH3 over an Fe−  zeolite Catalyst Résumé : The selective catalytic reduction of NOx with ammonia over an Fe−zeolite catalyst was investigated experimentally and a transient kinetic model was developed. The model includes reactions that describe ammonia storage and oxidation, NO oxidation, selective catalytic reduction (SCR) of NO and NO2, formation of N2O, ammonia inhibition and ammonium nitrate formation. The model can account for a broad range of experimental conditions in the presence of H2O, CO2, and O2 at temperatures from 150 to 650 °C. The catalyst stores ammonia at temperatures up to 400 °C and shows ammonia oxidation activity from 350 °C. The catalyst is also active for the oxidation of NO to NO2 and the oxidation reaches equilibrium at 500 °C. The SCR of NO is already active at 150 °C and the introduction of equal amounts of NO and NO2 greatly enhances the conversion of NOx at temperatures up to 300 °C. The formation of N2O is negligible if small fractions of NO2 are fed to the reactor, but a significant amount of N2O is formed at high NO2 to NO ratios. An ammonia inhibition on the SCR of NO is observed at 200 °C. This kinetic model contains 12 reactions and is able to describe the experimental results well. The model was validated using short transient experiments and experimental conditions not used in the parameter estimation and predicted these new conditions adequately. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9003464

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