One promising alternative for meeting stringent NOx limits while attaining high engine efficiency in lean-burn operation are NOx storage catalysts (NSC), an established technology in passenger car aftertreatment systems. For this reason, a NSC system for a stationary single-cylinder CHP gas engine with a rated electric power of 5.5 kW comprising series automotive parts was developed. Main aim of the work presented in this paper was maximising NOx conversion performance and determining the overall potential of NSC aftertreatment with regard to min-NOx operation.The experiments showed that both NOx storage and reduction are highly sensitive to exhaust gas temperature and purge time. While NOx adsorption rate peaks at a NSC inlet temperature of around 290 °C, higher temperatures are beneficial for a fast desorption during the regeneration phase. Combining a relatively large catalyst (1.9 l) with a small exhaust gas mass flow leads to a low space velocity inside the NSC. This enabled long storage periods up to 40 min with purge times of around 40 s. At constant engine power, the NSC system allows reducing tailpipe NOx emissions by up to 92 % (NOx ≈ 22.5 ppm) compared to lean-burn operation at MBT spark timing, while showing a fuel penalty of < 2 %. An oxidation catalyst positioned upstream of the NSC only proved beneficial to reducing HC emissions, while not affecting neither NOx and CO output but increasing fuel penalty due to reduced NOx storage capacity.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Development of a NOx Storage-Reduction Catalyst Based Min-NOx Strategy for Small-Scale NG-Fueled Gas Engines


    Additional title:

    Sae Int. J. Fuels Lubr
    Sae International Journal of Fuels and Lubricants


    Contributors:

    Conference:

    SAE/JSAE 2016 Small Engine Technology Conference & Exhibition ; 2016



    Publication date :

    2016-11-08


    Size :

    16 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Crankcase Oil Development for Alcohol Fueled Engines

    Millard,D.H. / Howlett,B.J. / Chaibongsai,S. et al. | Automotive engineering | 1982


    Coal-Fueled Diesel Engines

    Robben, Frank | SAE Technical Papers | 1983


    Organic exhaust analysis from ethanol mixture fueled small engines

    Lin,M. / Jia,B. / Yan,X. et al. | Automotive engineering | 2007


    NOx storage-reduction catalyst ( NSR catalyst ) for automotive engines

    Matsumoto,S. / Miyoshi,N. / Ikeda,Y. et al. | Automotive engineering | 1999


    Development of valve seat material for gas-fueled engines

    Sato,K. / idorikawa,T. / Takahashi,T. et al. | Automotive engineering | 2000