A mathematical model is developed for the simulation of the chemical and transport phenomena in three-way catalysts for natural-gas vehicles, with honeycomb and foam substrates. The chemical phenomena are modelled on the basis of a simplified approach, which assumes that pollutant conversion is governed by oxygen storage and release dynamics. The transport phenomena, i.e. heat transfer, gas-phase mass transfer, washcoat diffusion, and pressure drop, are modelled on the basis of correlations adapted from the literature. The model is validated using lambda scan tests and a cold-start driving cycle, carried out with a honeycomb catalyst and a ceramic foam catalyst. The experimental data show a decline in methane conversion for lean mixtures, which is modelled by an inhibition term of methane oxidation from nitric oxide. The proposed model may capture the performance of both substrates with sufficient accuracy, both under cold-start and under hot-mode conditions. The model-based comparison of the two substrates shows that the ceramic foam presents inferior carbon monoxide conversion in the extra-urban part of the cycle. Although the gas-phase mass transfer in the ceramic foam is faster than with the honeycomb monolith, diffusion in the washcoat pores is much slower. As a result, the mass-transfer-limited conversion efficiency of the foam is lower. This is primarily attributed to the higher washcoat thickness of the foam sample tested.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    A simplified model for natural-gas vehicle catalysts with honeycomb and foam substrates


    Contributors:


    Publication date :

    2009-06-01


    Size :

    16 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    A simplified model for natural-gas vehicle catalysts with honeycomb and foam substrates

    Tsinoglou, D.N. / Dimopoulos Eggenschwiler, P. / Thurnheer, T. et al. | Tema Archive | 2009


    A simplified model for natural-gas vehicle catalysts with honeycomb and foam substrates

    Tsinoglou,D.N. / Eggenschwiler,P.D. / Thurnheer,T. et al. | Automotive engineering | 2009



    Characteristics of thin wall honeycomb substrates for automotive catalysts

    Kitagawa,J. / Machida,M. / NGK Insulators,JP | Automotive engineering | 1991


    Honeycomb foam structure seat

    GAO ZHENHAI / CHEN FEI / GAO FEI et al. | European Patent Office | 2015

    Free access