The reduction of NOx from Diesel Engines or Lean-burn Gasoline Engines is a major issue in automotive catalysis. Over the last several years, many solutions to remove NOx under lean operating conditions have been considered. Attention is now focused on two main technologies: (i) Selective Catalytic Reduction using ammonia as reductant (urea SCR) and (ii) NOx-Storage Catalyst (NSC).This paper deals with materials for NOx storage catalysts. NSC catalysts show high efficiency as fresh, but their durability is low due to a fast deactivation of the active sites [1,3]. This issue relates to a drastic sintering of the materials after ageing, especially during the regeneration and the desulfation [3, 4 and 5]. Moreover, the current materials are sensitive to SOx poisoning [1,3,4].In this paper, ceria based oxides have been examined as NOx-storage materials and Pt carriers as well. These oxides contain high ceria loading and are thermally stable up to 900°C. The corresponding aged Pt model catalysts show high NOx-Storage capacity at low temperature from 200°C to 300°C, even after hydrothermal ageing at 700°C and sulfation treatments.The homogeneously dispersion of these oxides on Ba or La stabilized alumina with a Rhodia proprietary process, leads to a new generation of functionalized alumina with very high NOx storage capacity on the whole temperature range - 200°C - 450°C


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    Title :

    Ceria-Based Materials for DeNOx Catalysts Efficient at Low Temperature and with Improved Sulphur Tolerance


    Additional title:

    Sae Technical Papers


    Contributors:
    Pitois, C. (author) / Rohart, E. (author) / Bellière-Baca, V. (author) / Harlé, V. (author)

    Conference:

    SAE World Congress & Exhibition ; 2008



    Publication date :

    2008-04-14




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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