Effect of Gasoline Olefin Composition on Predicted Ozone in 2005/2010 - Auto/Oil Air Quality Improvement Research Program 940579
The effect of gasoline olefin composition and content on urban ozone was estimated using the Urban Airshed Model (UAM), emission measurements for a base fuel, and projected emissions for two hypothetical fuels with reduced olefin content. The projected emissions for the hypothetical fuels were developed using regressions developed from Auto/Oil Air Quality Improvement Research Program (AQIRP) Phase I testing, a vapor headspace model and other information. Ozone modeling was conducted for Los Angeles in year 2010 and Dallas-Fort Worth and New York in year 2005. When all olefins were removed from the base fuel, the light-duty vehicle contribution to peak hourly ozone was reduced by 8 to 12%. This corresponds to a projected reduction of 0.6 to 0.8% in total peak ozone from all sources. Removing only light (C5) olefins provided 67 to 78% of the peak ozone benefit from removal of all olefins. Reducing fuel C5 olefin content was estimated to be 3.5 to 6 times more effective in reducing peak ozone than reducing heavier olefins (C6+) by an equal volume percent. The effect of olefins on predicted ozone was due primarily to a reduction in the reactivity of evaporative, running loss and refueling/storage emissions. There is uncertainty in the predicted effects; in particular, the effect of olefin reduction expressed as a percentage of total peak ozone from all sources may be underestimated.
Citation: Schleyer, C., Koehl, W., Leppard, W., Dunker, A. et al., "Effect of Gasoline Olefin Composition on Predicted Ozone in 2005/2010 - Auto/Oil Air Quality Improvement Research Program," SAE Technical Paper 940579, 1994, https://doi.org/10.4271/940579. Download Citation
Charles H. Schleyer, William J. Koehl, William R. Leppard, Alan M. Dunker, Greg Yarwood, Jonathan P. Cohen, Alison K. Pollack
Mobil Rearch and Development Corp., General Motors NAO Research and Development Center, Systems Applications International
International Congress & Exposition
Auto/Oil Air Quality Improvement Research Program - Volume Iii-SP-1117, SAE 1994 Transactions: Journal of Fuels and Lubricants-V103-4