The California Air Resources Board (CARB) has recently adopted direct ozone reduction (DOR) technologies as an emission control alternative. The application of DOR technologies on motor vehicles allows an automaker to receive non-methane organic gas (NMOG) emission credits, which may be applied to offset vehicle tailpipe emissions or evaporative emissions from fuel tanks. Additionally, DOR technologies can enhance the 'green image' of an automaker. DOR devices involve catalyst coatings on radiators or other surfaces in such a way that the amount of ozone in the ambient air passing through such surfaces is reduced. The deposition of catalysts onto substrates (e.g. radiator surfaces) is traditionally accomplished using a slurry process, which often involves multiple steps in coating formation. In this work, deposition of catalytic coatings onto radiator surfaces via kinetic and thermal spray processes is explored. We demonstrate that catalytic materials could be successfully deposited directly onto radiator surfaces using a thermal spray process. Coating characterization studies show that the composition of catalytically active coating surfaces is MnOx (x between 1.5 to 2) when metal Mn powders are used as a feedstock. Our results show that ozone removal by the thermally sprayed Mn-based caralysts on radiators is efficient (about70 - 80 % at the radiator's fully warmed-up temperature of about 82 deg C) and is comparable to or better than commercially available sample catalysts prepared using slurry-based deposition techniques. The thermal spray process is relatively rapid, involves only a single step in coating formation, and potentially is a low cost alternative to the current slurry technology. The thermally sprayed coatings, which are considerable thinner (typically non-continuous) than slurry coatings, are expected to have fewer adverse effects on thermal performance and backpressure of radiators. The coating adhesion can be improved by optimizing thermal spray process variables, such as substrate cleaning and treatment before deposition, substrate temperature during deposition, type of feedstock powder, and the addition of second metals such as Cu and Zn.


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    Titel :

    Deposition of catalysts onto vehicle heat exchangers via thermal and kinetic spray processes for direct ozone reduction


    Beteiligte:
    Wu, M.C. (Autor:in) / Zhao, Z. (Autor:in) / Gillispie, B.A. (Autor:in) / Smith, J.R. (Autor:in) / Sultan, M. (Autor:in)


    Erscheinungsdatum :

    2003


    Format / Umfang :

    11 Seiten, 16 Bilder, 3 Tabellen, 22 Quellen




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Deposition of Catalysts onto Vehicle Heat Exchangers via Thermal and Kinetic Spray Processes for Direct Ozone Reduction

    Gillispie, Bryan A. / Smith, John R. / Sultan, Michel et al. | SAE Technical Papers | 2003


    Deposition of Catalysts onto Vehicle Heat Exchangers via Thermal and Kinetic Spray Processes for Direct Ozone Reduction

    Wu, M.-C. / Zhao, Z. / Gillispie, B. A. et al. | British Library Conference Proceedings | 2003


    VEHICLE THERMAL MANAGEMENT SYSTEM AND HEAT EXCHANGERS

    HOEHNE MARK R / YUHASZ DONALD P / JOHNSTON VINCENT G | Europäisches Patentamt | 2022

    Freier Zugriff