The Effect of Ambient Temperature on the Emissions of Some Nitrogen Compounds:A Comparative Study on Low-, Medium- and High-Mileage Three-Way Catalyst Vehicles

950933

02/01/1995

Event
International Congress & Exposition
Authors Abstract
Content
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.
Meta TagsDetails
DOI
https://doi.org/10.4271/950933
Pages
12
Citation
Laurikko, J., and Aakko, P., "The Effect of Ambient Temperature on the Emissions of Some Nitrogen Compounds:A Comparative Study on Low-, Medium- and High-Mileage Three-Way Catalyst Vehicles," SAE Technical Paper 950933, 1995, https://doi.org/10.4271/950933.
Additional Details
Publisher
Published
Feb 1, 1995
Product Code
950933
Content Type
Technical Paper
Language
English