NO adsorption on fresh and aged Pd-Rh ...
Document type :
Autre communication scientifique (congrès sans actes - poster - séminaire...): Communication dans un congrès sans actes
Permalink :
Title :
NO adsorption on fresh and aged Pd-Rh Natural Gas Vehicle catalysts : A TAP approach
Author(s) :
Granger, Pascal [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]
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]
Conference title :
Tenth International Congress on Catalysis and Automotive Pollution Control (Capoc10)
City :
Brussel
Country :
Belgique
Start date of the conference :
2015-10
English keyword(s) :
Thermal aging
TAP reactor
NGV Pd–Rh catalyst
NO adsorption
DeNOx
N2O formation
TAP reactor
NGV Pd–Rh catalyst
NO adsorption
DeNOx
N2O formation
HAL domain(s) :
Chimie/Catalyse
English abstract : [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 ...
Show more >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.Show less >
Show more >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.Show less >
Language :
Anglais
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
CNRS
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Centrale Lille
ENSCL
Univ. Artois
Université de Lille
Collections :
Research team(s) :
Remédiation et matériaux catalytiques (REMCAT)
Submission date :
2019-09-25T15:21:58Z
2021-06-04T09:07:29Z
2024-01-12T11:03:39Z
2024-01-12T11:05:53Z
2024-01-31T14:19:34Z
2021-06-04T09:07:29Z
2024-01-12T11:03:39Z
2024-01-12T11:05:53Z
2024-01-31T14:19:34Z
Files
- 1 - NO Adsorption and Reaction on Aged Pd.pdf
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