The effect of ambient temperature on the emissions of some nitrogen compounds. A comparative study on low, medium and highmileage threeway catalyst vehicles

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    Abstract

    Using fast FTIR-technology (Fourier Transform Infra-Red) to complement the normal regulated emission analysis, VTT Energy has performed exhaust emission measurements for several light-duty motor vehicles (passenger cars) representing a variety of current level technologies, mostly employing a three-way catalytic converter. Tests have been performed using standardized test procedures and driving cycles (U.S.EPA and ECE/EEC). Apart from the basic technology of the vehicle, ambient temperature has also been varied. Most of the tests are run at +20 to +22 °C ambient temperature, but additional tests have been carried out at ±0°C, -7 °C and even at -20 °C.
    Test results suggest that nitrous oxide output varies largely from vehicle to vehicle, and its is also dependent on the ambient temperature. Most significant factor, however, seems to be vehicle mileage, or rather catalyst activity, as already suggested in previous studies. Furthermore, the detailed time resolved analysis supports the theory presented in the literature, that nitrous oxide is formed in a three-way catalytic converter within certain temperature range below the normal operating temperature.
    Original languageEnglish
    Pages (from-to)12
    JournalSAE Technical Paper Series
    Issue number950933
    DOIs
    Publication statusPublished - 1995
    MoE publication typeA1 Journal article-refereed
    Event1995 SAE International Congress and Exposition - Detroit, MI, United States
    Duration: 27 Feb 19952 Mar 1995

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