Activity function for describing alteration of three-way catalyst performance over palladium-only three-way catalysts by catalyst mileage / Sung Bong Kang in Industrial & engineering chemistry research, Vol. 50 N° 9 (Mai 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5499–5509 Titre : Activity function for describing alteration of three-way catalyst performance over palladium-only three-way catalysts by catalyst mileage Type de document : texte imprimé Auteurs : Sung Bong Kang, Auteur ; Hyuk Jae Kwon, Auteur ; In-Sik Nam, Auteur Année de publication : 2011 Article en page(s) : pp. 5499–5509 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst mileage Résumé : A simple three-way catalyst (TWC) activity function based upon the alteration of the Pd metallic surface area (MSA) of Pd-only commercial monolith TWCs has been developed to describe the change of the catalytic performance with respect to the Pd metal loading varying from 5 to 10 g/L and the field-aged catalyst mileage from 4K (stabilized) to 98K miles. Particularly, the change of the Pd MSA of TWC with respect to the catalyst mileage has been well-correlated by the second-order sintering kinetics, regardless of the Pd content of the TWC. The TWC activity function was incorporated into the primary reaction kinetics developed for the stabilized 4K Pd-only TWCs to predict the deactivation of the Pd-only TWC performance with respect to the field-aged mileage. The overall reaction kinetic model with the TWC activity function developed in the present study is capable of describing the alteration of TWC performance with respect to the catalyst mileage, regardless of the catalyst metal content. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200083f [article] Activity function for describing alteration of three-way catalyst performance over palladium-only three-way catalysts by catalyst mileage [texte imprimé] / Sung Bong Kang, Auteur ; Hyuk Jae Kwon, Auteur ; In-Sik Nam, Auteur . - 2011 . - pp. 5499–5509. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 9 (Mai 2011) . - pp. 5499–5509 Mots-clés : Catalyst mileage Résumé : A simple three-way catalyst (TWC) activity function based upon the alteration of the Pd metallic surface area (MSA) of Pd-only commercial monolith TWCs has been developed to describe the change of the catalytic performance with respect to the Pd metal loading varying from 5 to 10 g/L and the field-aged catalyst mileage from 4K (stabilized) to 98K miles. Particularly, the change of the Pd MSA of TWC with respect to the catalyst mileage has been well-correlated by the second-order sintering kinetics, regardless of the Pd content of the TWC. The TWC activity function was incorporated into the primary reaction kinetics developed for the stabilized 4K Pd-only TWCs to predict the deactivation of the Pd-only TWC performance with respect to the field-aged mileage. The overall reaction kinetic model with the TWC activity function developed in the present study is capable of describing the alteration of TWC performance with respect to the catalyst mileage, regardless of the catalyst metal content. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200083f

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Simulation of a nonisothermal modern three-way catalyst converter / Hyuk Jae Kwon in Industrial & engineering chemistry research, Vol. 49 N° 15 (Août 2010)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7039–7051 Titre : Simulation of a nonisothermal modern three-way catalyst converter Type de document : texte imprimé Auteurs : Hyuk Jae Kwon, Auteur ; Joon Hyun Baik, Auteur ; Sung Bong Kang, Auteur Année de publication : 2010 Article en page(s) : pp 7039–7051 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nonisothermal Catalyst converter. Résumé : A two-dimensional (2D) nonisothermal monolith reactor model based upon intrinsic detailed reaction kinetics has been developed to simulate the performance of a commercial modern three-way catalytic converter. The model directly employed the reliable kinetic parameters estimated from the detailed reaction kinetics determined over the powder-type three-way catalysts (TWCs). The TWC activity of the monolith reactor containing each Pd and Pt/Rh/Ce catalyst with respect to the catalyst mileages, 4k miles (stabilized) and 100k miles (aged) equivalent aged by engine-dynamometer, has been examined in a molten-salt bath under the steady-state condition. To simulate the commercial performance of a modern TWC converter, both reactor models specifically developed for the Pd (front) and Pt/Rh/Ce (rear) monoliths have been sequentially integrated on the basis of the commercial configuration of the monolith reactors in a dual-bed mode. The 2D nonisothermal monolith reactor model developed in the present study well predicts the TWC performance, including the gas compositions and the temperature distribution with respect to both axial and radial positions of the single-bed containing each individual catalyst monolith as well as of the dual-bed monolith reactor system including both Pd (front) and Pt/Rh/Ce (rear) monolith bricks. The reactor model was further validated by predicting the TWC performance of the dual-bed reactor under the steady-state sweep test (st-ST) condition varying the A/F ratios from 14.23 to 15.03 with respect to the reaction temperature. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007486 [article] Simulation of a nonisothermal modern three-way catalyst converter [texte imprimé] / Hyuk Jae Kwon, Auteur ; Joon Hyun Baik, Auteur ; Sung Bong Kang, Auteur . - 2010 . - pp 7039–7051. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 15 (Août 2010) . - pp 7039–7051 Mots-clés : Nonisothermal Catalyst converter. Résumé : A two-dimensional (2D) nonisothermal monolith reactor model based upon intrinsic detailed reaction kinetics has been developed to simulate the performance of a commercial modern three-way catalytic converter. The model directly employed the reliable kinetic parameters estimated from the detailed reaction kinetics determined over the powder-type three-way catalysts (TWCs). The TWC activity of the monolith reactor containing each Pd and Pt/Rh/Ce catalyst with respect to the catalyst mileages, 4k miles (stabilized) and 100k miles (aged) equivalent aged by engine-dynamometer, has been examined in a molten-salt bath under the steady-state condition. To simulate the commercial performance of a modern TWC converter, both reactor models specifically developed for the Pd (front) and Pt/Rh/Ce (rear) monoliths have been sequentially integrated on the basis of the commercial configuration of the monolith reactors in a dual-bed mode. The 2D nonisothermal monolith reactor model developed in the present study well predicts the TWC performance, including the gas compositions and the temperature distribution with respect to both axial and radial positions of the single-bed containing each individual catalyst monolith as well as of the dual-bed monolith reactor system including both Pd (front) and Pt/Rh/Ce (rear) monolith bricks. The reactor model was further validated by predicting the TWC performance of the dual-bed reactor under the steady-state sweep test (st-ST) condition varying the A/F ratios from 14.23 to 15.03 with respect to the reaction temperature. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1007486

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