The three way catalyst NOx trap catalyst (TWC-NT) is consisted of a conventional three way catalyst (TWC) compositions and NOx storage material (NSM) to mitigate NOx breakthrough occurred during the fuel cut event to improve fuel economy of stoichiometric (A/F = 14.6) gasoline powered vehicles. Typical fuel cut operation generates very lean exhaust mixture that oxidizes the catalyst surface in TWC system, and NOx is slipped on the oxygen rich catalyst surface when the engine is switched back to the stoichiometric air to fuel ratio. The fully batch formulated TWC and TWC-NT catalyst were prepared and aged on engine dynamometer equivalent to 150,000 miles at underfloor location. The aged catalysts was evaluated at LEV-3 SULEV30 passenger car to check their effects on NOx efficiency, fuel saving and N2O suppression ability. The results revealed TWC-NT showed higher NOx removal performance by 71 % with multiple the fuel cuts and O2 purge period through the thermally enhanced NOx storage and reduction function, and 2 % higher fuel economy on FTP-75 cycle than the conventional TWC. Also the catalyst had good N2O suppression ability by the removal of NOx as the main reactant of N2O formation in the exhaust gas reactions over catalyst.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Improvement of Fuel Economy and Greenhouse Gases Reduction in Gasoline Powered Vehicles Through the TWC-NOx Trap Catalyst


    Additional title:

    Int.J Automot. Technol.


    Contributors:
    Song, Jinwoo (author) / Choi, Muyoung (author) / Lee, Jun (author) / Kim, Ji Man (author)

    Published in:

    Publication date :

    2020-04-01


    Size :

    9 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Strategies for fuel economy improvement of gasoline powertrains

    Piccone,A. / Rinolfi,R. / Imarisio,R. et al. | Automotive engineering | 1996


    Effects of Test Conditions on Fuel Economy of Gasoline-Powered Vehicle

    Kwon, Seokjoo / Kang, Minkyung / Seo, Youngho et al. | Online Contents | 2018


    Effects of Test Conditions on Fuel Economy of Gasoline-Powered Vehicle

    Kwon, Seokjoo / Kang, Minkyung / Seo, Youngho et al. | Springer Verlag | 2018


    Factors Affecting Fuel Economy in Diesel Powered Vehicles

    Joyner, J. A. | SAE Technical Papers | 1965


    Factors affecting fuel economy in diesel powered vehicles

    Joyner, J.A. | Engineering Index Backfile | 1965