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NO Adsorption and Reaction on Aged Pd–Rh Natural Gas Vehicle Catalysts: A Combined TAP and Steady-State Kinetic Approach

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Abstract

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.

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Acknowledgments

We would like to thank the Ademe for a grant (Y. Renème). The laboratory participates in the Institut de Recherche en ENvironnement Industriel (IRENI) which is financed by the Communauté Urbaine de Dunkerque, the Région Nord Pas-de-Calais, the Ministère de l’Enseignement Supérieur et de la Recherche, the CNRS and European Regional Development Fund (ERDF).

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Authors and Affiliations

  1. Unité de Catalyse et de Chimie du Solide, ENSCL, UMR CNRS 8181, Université Lille 1 Sciences et Technologies, Bât. C3 Villeneuve d’Ascq, 59650, Villeneuve d’Ascq, France

    Pascal Granger, Y. Renème & F. Dhainaut

  2. Ircelyon, CNRS, Université Lyon 1, 2 avenue A. Einstein, 69000, Lyon, France

    Y. Schuurman & C. Mirodatos

Authors
  1. Pascal Granger
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  2. Y. Renème
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  3. F. Dhainaut
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  4. Y. Schuurman
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  5. C. Mirodatos
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Correspondence to Pascal Granger.

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Granger, P., Renème, Y., Dhainaut, F. et al. NO Adsorption and Reaction on Aged Pd–Rh Natural Gas Vehicle Catalysts: A Combined TAP and Steady-State Kinetic Approach. Top Catal 60, 289–294 (2017). https://doi.org/10.1007/s11244-016-0613-z

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  • DOI: https://doi.org/10.1007/s11244-016-0613-z

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