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Poster De Conférence Année : 2016

Role of the dopants in the redox properties of ceria

Résumé

Environmental regulations on NOx emissions of mobile sources are becoming increasingly demanding. The NOx storage-reduction (NSR) catalytic technology is one of the solution lean-burn engines. NSR catalysts work in cyclic gas-composition conditions. During the first step (lean phase), NSR materials store emitted NOx as nitrates until the surface reaches the saturation threshold. A pulse of fuel post-injection then triggers the short second step (rich phase), during which the reducing conditions lead to nitrate decomposition and release as well as subsequent NOx reduction into N2 and surface regeneration. Ceria is an interesting material since it plays a double function first as a high specific surface area support1 for platinum group metal (PGM) dispersion and secondly as a NOx trap at low temperature until 350°C. Below 200°C, the NOx storage capacity of ceria is higher than that of barium which is commonly used as a storing agent2. In addition, ceria can limit the thermal sintering of Pt nanoparticles3. This study aims to deeply characterize the impact of the nature of dopant (Zr and Pr) on the redox properties of ceria-based oxides.
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Dates et versions

hal-01341546 , version 1 (04-07-2016)

Identifiants

  • HAL Id : hal-01341546 , version 1

Citer

G. Ferre, S. Grenier, A. Westermann, J. Couble, F. Bosselet, et al.. Role of the dopants in the redox properties of ceria. 16th International Congress on Catalysis, Jul 2016, Pekin, China. ⟨hal-01341546⟩
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