The latest emission regulations for mobile and stationary applications require the use of aftertreatment methods for NOx and diesel particulate filters (DPF) for particulate matter (PM). SCR catalysts were evaluated by laboratory experiments and the most promising SCR catalysts were also scaled up to full-size. Development with copper (Cu) and iron (Fe) on zeolitic materials (Beta, ZSM-5, SAPO, chabazite) has resulted in the new generation of thermally durable SCR (selective catalytic reduction) catalysts, which have also an improved sulfur tolerance and a low N2O formation tendency. Opposite to Cu on Beta and ZSM-5, Cu on chabazite and SAPO showed clearly lower N2O formation. Cu-SCR catalysts had a low dependency on NO2/NOx but Fe-SCR catalysts required a higher NO2/NOx ratio (>0.3) to keep a high NOx efficiency. The decomposition of sulfates on the durable Cu- and Fe-SCR catalysts was investigated by temperature programmed oxidation (TPO) and reduction (TPR) methods to find the appropriate conditions for desulfation.Full-scale SCR systems with diesel oxidation catalysts (DOC) were evaluated by engine bench experiments. The Cu-SCR based catalysts showed a wide operation window, resulting in NOx conversions above 95% as fresh and thermally aged at 650-750°C. The platinum containing ammonia slip catalyst (ASC) is usually integrated as a short zone on the SCR unit and its main role is to prevent slip in transient conditions.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Durable Copper and Iron SCR Catalysts for Mobile Diesel and Dual-Fuel Applications


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2016 International Powertrains, Fuels & Lubricants Meeting ; 2016



    Publication date :

    2016-10-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Durable Copper and Iron SCR Catalysts for Mobile Diesel and Dual-Fuel Applications

    Maunula, Teuvo / Wolff, Thomas | British Library Conference Proceedings | 2016


    Thermally Durable Vanadium-SCR Catalysts for Diesel Applications

    Viitanen, Arto / Savimaki, Auli / Kanniainen, Kauko et al. | SAE Technical Papers | 2013


    Doped Zirconia with Acidity and High Thermal Stability, for Durable Diesel Catalysts

    Butler, C. / Harris, D. / Rohart, E. et al. | SAE Technical Papers | 2007


    Doped zirconia with acidity and high thermal stability for durable diesel catalysts

    Verdier,S. / Criniere,G. / Larcher,O. et al. | Automotive engineering | 2007


    Co-Engineering Durable, Fuel Efficient Engine Oils for Diesel Passenger Cars

    Symonds, M. / Ritchie, C. / Rai, R. et al. | British Library Conference Proceedings | 2013