For the removal of NOx from the oxygen-rich diesel exhaust in mobile applications the selective catalytic reduction (SCR) is one of the most favored technologies. Well established NH₃-SCR technique uses either V₂O₅/WO₃-TiO₂ or Zeolite-based catalysts, NOx being continuously reduced by NH₃ resulting in the selective formation of nitrogen and water. A major drawback of V₂O₅-based formulations is their lower thermal stability and low temperature activity, in addition, V₂O₅ release poses serious environmental and toxicity problems. In active filter regeneration performed by post-injection of fuel the temperature may increase up to 800°C resulting in drastic loss of activity (due to poor stability of V₂O₅-based formulations) as well as discharge of V₂O₅. Zeolite-based catalysts promoted by transition metal such as Fe and Cu represent an excellent solution to overcome the stability problems of V₂O₅-based catalysts with only a small activity penalty and cost raise issues but may show disadvantages in stability after hydrothermal ageing. In the present study a new class of rare earth modified Fe vanadates are shown to be valid substitutes of V₂O₅ in SCR catalyst providing i) good activity in the low temperature window (180°C-300°C) ii) high temperature stability up to 850°C, with no major associated activity loss, iii) absence of toxicological and environmental concern.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    A New Class of Environmental Friendly Vanadate Based NH3 SCR Catalysts Exhibiting Good Low Temperature Activity and High Temperature Stability


    Weitere Titelangaben:

    Sae Int. J. Engines


    Beteiligte:

    Kongress:

    SAE 2011 World Congress & Exhibition ; 2011


    Erschienen in:

    Erscheinungsdatum :

    2011-04-12


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch






    Environmental-friendly simple automobile interior temperature regulating device

    WU YUANHUI | Europäisches Patentamt | 2015

    Freier Zugriff

    High Temperature Stability of Ceria-Zirconia Supported Pd Model Catalysts

    Cuif, J.-P. / Deutsch, S. / Marczi, M. et al. | British Library Conference Proceedings | 1998


    High temperature stability of Ceria-Zirconia supported PD model catalysts

    Cuif,J.P. / Deutsch,S. / Marczi,M. et al. | Kraftfahrwesen | 1998