Five field-aged catalysts with different mileages were analysed with respect to emission performance and structural changes. The FTP-75 emission results were compared to synthetic exhaust gas tests including: i) light-off, ii) lambda screening at stationary and oscillating stoichiometry, iii) space velocity variation. Several samples from different positions of one catalyst were used to achieve the spatially resolved activity profile for that catalyst. Surface characterisation was used to characterise accumulated catalyst poison.Laboratory space velocity test was concluded to be a sensitive probe for catalyst performance: good correlation to vehicle emission data was found. An analysis of the influence of temperature and λ oscillation on the catalyst conversion performance was made, with particular emphasis on the ageing effects. The oxidation of hydrocarbons and CO, and the reduction of NO was significantly higher during oscillations at 753 K than at steady state, while this effect was not found at 653 K. The spatially resolved activity profile revealed large differences between the oxidation and NO reduction activities, the latter being the most significantly deteriorated catalyst function.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Deterioration of Three-Way Automotive Catalysts, Part I - Steady State and Transient Emission of Aged Catalyst


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Jobson, Edward (Autor:in) / Högberg, Erik (Autor:in) / Smedler, Gudmund (Autor:in) / Wirmark, Göran (Autor:in) / Bernler, Hans (Autor:in) / Laurell, Mats (Autor:in) / Lundgren, Staffan (Autor:in)

    Kongress:

    International Congress & Exposition ; 1993



    Erscheinungsdatum :

    01.03.1993




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch






    Deterioration of Three-Way Automotive Catalysts, Part II - Oxygen Storage Capacity at Exhaust Conditions

    Jobson, Edward / Smedler, Gudmund / Bernler, Hans et al. | SAE Technical Papers | 1993



    Deterioration of Automotive Catalytic Converters: Physical Catalyst Characterisation

    Akolekar, Deepak B. / Watson, Harry C. / Föger, Karl et al. | SAE Technical Papers | 2001