NO Adsorption and Reaction on Aged Pd–Rh ...
Type de document :
Article dans une revue scientifique: Article original
URL permanente :
Titre :
NO Adsorption and Reaction on Aged Pd–Rh Natural Gas Vehicle Catalysts: A Combined TAP and Steady-State Kinetic Approach
Auteur(s) :
Granger, Pascal [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Renème, Y. [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dhainaut, Fabien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Schuurman, Yves [Auteur]
Mirodatos, C. [Auteur]
Renème, Y. [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Renème, Y. [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Dhainaut, Fabien [Auteur]
Unité de Catalyse et Chimie du Solide - UMR 8181 [UCCS]
Schuurman, Yves [Auteur]
Mirodatos, C. [Auteur]
Renème, Y. [Auteur]
Titre de la revue :
Topics in Catalysis
Numéro :
60
Pagination :
289-294
Date de publication :
2016
ISSN :
1022-5528
Mot(s)-clé(s) en anglais :
Thermal aging
TAP reactor
NGV Pd–Rh catalyst
NO adsorption
DeNOx
N2O formation
TAP reactor
NGV Pd–Rh catalyst
NO adsorption
DeNOx
N2O formation
Discipline(s) HAL :
Chimie/Catalyse
Résumé en anglais : [en]
A combined temporal analysis of products (TAP) and steady-state kinetic study was achieved to characterize the surface reactivity of fresh and aged bimetallic Pd–Rh/Al2O3 Natural-Gas Vehicle catalysts. Single NO pulse TAP ...
Lire la suite >A combined temporal analysis of products (TAP) and steady-state kinetic study was achieved to characterize the surface reactivity of fresh and aged bimetallic Pd–Rh/Al2O3 Natural-Gas Vehicle catalysts. Single NO pulse TAP experiments were performed on a stabilized surface after exposure to successive NO pulses until to get a steady-state NO conversion. Outlet flow curves recorded during such experiments show fast reaction steps taking place on noble metal particles and a slow process during NO desorption ascribed to the involvement of spill-over effect of chemisorbed NO molecules from the metal to the support. This slow process attenuates on the aged sample likely due to an alteration of the metal/support interface induced by particle sintering at high temperature. Thermal aging also alters the surface composition of bimetallic Pd–Rh particles which leads to changes in the products distribution from NO dissociation. A similar selectivity behavior is observed from steady-state kinetic measurements during the NO/H2 reaction. Interestingly, a weak partial pressure dependency of the selectivity reflects a surface Rh enrichment of Pd–Rh particles during aging.Lire moins >
Lire la suite >A combined temporal analysis of products (TAP) and steady-state kinetic study was achieved to characterize the surface reactivity of fresh and aged bimetallic Pd–Rh/Al2O3 Natural-Gas Vehicle catalysts. Single NO pulse TAP experiments were performed on a stabilized surface after exposure to successive NO pulses until to get a steady-state NO conversion. Outlet flow curves recorded during such experiments show fast reaction steps taking place on noble metal particles and a slow process during NO desorption ascribed to the involvement of spill-over effect of chemisorbed NO molecules from the metal to the support. This slow process attenuates on the aged sample likely due to an alteration of the metal/support interface induced by particle sintering at high temperature. Thermal aging also alters the surface composition of bimetallic Pd–Rh particles which leads to changes in the products distribution from NO dissociation. A similar selectivity behavior is observed from steady-state kinetic measurements during the NO/H2 reaction. Interestingly, a weak partial pressure dependency of the selectivity reflects a surface Rh enrichment of Pd–Rh particles during aging.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
ENSCL
CNRS
Centrale Lille
Univ. Artois
Université de Lille
CNRS
Centrale Lille
Univ. Artois
Université de Lille
Collections :
Équipe(s) de recherche :
Remédiation et matériaux catalytiques (REMCAT)
Date de dépôt :
2019-09-25T14:06:35Z
2024-01-12T09:25:39Z
2024-01-12T09:25:39Z
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