In recent years, ammonia slip catalysts (ASC) are being used downstream of an SCR system to minimize the ammonia slip. The dual-layer ASC is more attractive for its bi-functionality in reducing the ammonia and NOX emissions. It consists of two layers with the upper layer comprising a component with SCR functionality and the lower layer a PGM containing catalyst with oxidation functionality. Thus, both oxidation and SCR reactions take place in two different layers and are interlinked by the inter-layer mass transfer mechanism. In addition, adsorption and desorption kinetics between the gas and solid phases play a significant role. Mathematically, the overall system is a complex system of mass, momentum and energy transfer equations with temporal and spatial variables in both axial and radial directions. In this work, we focus on devising a suitable, computationally inexpensive model for such ASCs to be efficiently used for design, control and system optimization studies. We discuss a 1D+1D (Pseudo 2D) model capturing the above-mentioned mechanisms to different extents and investigate the accuracy of the model in both steady state and transient modes. Extensive model validation has been carried out against Cu-ASC reactor and engine data; good agreement between the model predictions and the experimental results was achieved.


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    Titel :

    Modeling of Dual Layer Ammonia Slip Catalysts (ASC)


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Nande, Abhijeet (Autor:in) / Johansson, Asa (Autor:in) / Sukumar, Balaji (Autor:in) / Ranganath, Bhargav (Autor:in) / Dai, Jianguo (Autor:in) / Ahmadinejad, Mehrdad (Autor:in) / Markatou, Penelope (Autor:in) / Szailer, Tamas (Autor:in) / Watling, Timothy (Autor:in)

    Kongress:

    SAE 2012 World Congress & Exhibition ; 2012



    Erscheinungsdatum :

    2012-04-16




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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