NOx removal efficiency and ammonia selectivity during the NOx storage-reduction process over Pt/BaO(Fe, Mn, Ce)/Al2O3 model catalysts. Part II: Influence of Ce and Mn-Ce addition - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Applied Catalysis B: Environmental Année : 2011

NOx removal efficiency and ammonia selectivity during the NOx storage-reduction process over Pt/BaO(Fe, Mn, Ce)/Al2O3 model catalysts. Part II: Influence of Ce and Mn-Ce addition

Résumé

It was previously demonstrated in the first part of this work that NOx storage-reduction process over Pt/BaO/Al2O3 model catalyst is limited by the reduction step, with ammonia emission since H-2 is not fully consumed. The stored NOx reacts preferentially with the introduced H-2 giving NH3, than with NH3 in order to produce N-2. Mn addition favors the NOx reduction with ammonia leading to better conversion and selectivity, but only at 400 degrees C. In Part II, a special attention was focused on the role of Ce and Mn-Ce addition in regard to the NOx conversion and the ammonia emission in the 200-400 degrees C temperature range. With ceria modified Pt/20Ba/Al catalyst, significant improvements are obtained from 300 degrees C. In addition to the enhancement of the NOx + NH3 reaction, the ammonia selectivity is maintained at a lower level compared with Pt/Ba(Mn)/Al catalysts, even in the case of a large H-2 excess. It is attributed to the ammonia oxidation into N-2 via the available oxygen at the catalyst surface. A synergetic effect is observed between Mn and Ce when they are added simultaneously in Pt/Ba/Al catalyst

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Catalyse Autre
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hal-00739511 , version 1 (22-01-2021)

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N. Le Phuc, X. Courtois, F. Can, S. Royer, P. Marecot, et al.. NOx removal efficiency and ammonia selectivity during the NOx storage-reduction process over Pt/BaO(Fe, Mn, Ce)/Al2O3 model catalysts. Part II: Influence of Ce and Mn-Ce addition. Applied Catalysis B: Environmental, 2011, 102 (3-4), pp.362-371. ⟨10.1016/j.apcatb.2010.12.043⟩. ⟨hal-00739511⟩
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