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Effects of engine load and fuel sulfur on the organosulfur content of diesel particulate matter.

Liang-F; Lu-M; Keener-TC; Liu-Z; Birch-ME
A&WMA 98th Annual Conference & Exhibition, Minneapolis, Minnesota, June 2005. Pittsburgh, PA: Air & Waste Management Association, 2005 Jun; :1-13
The sulfur content of diesel fuel is a health concern because sulfur promotes formation of diesel particulate matter (DPM). Recognizing the role of sulfur in DPM formation, the U.S. Environmental Protection Agency (EPA) has established more stringent regulations for the sulfur content of diesel fuels. In this study, preliminary results on the types and amounts of organosulfur compounds in DPM extracts and the corresponding fuels are reported. In the fuels tested, dibenzothiophene (DBT), 4-methyldibenzothiophene (4-MDBT), and 4,6-dimethyldibenzothiophene (4,6-DMDBT) were the most abundant sulfur compounds, while heavier components were more abundant in DPM extracts. A high-sulfur diesel fuel contained a greater proportion of lighter sulfur compounds. In DPM, the concentrations of total organic sulfur and sulfur compounds were higher with a high-sulfur fuel, but sulfur content had little influence on the distribution of sulfur species. Though the sulfur content of DPM extracts increased with increasing fuel sulfur, the conversion rate of fuel sulfur to DPM sulfur decreased, possibly because the higher sulfur fuel contains a higher proportion of lighter components that remain in the gas phase. The influence of engine load on the DPM composition also was examined. With increasing load, the concentrations of lighter compounds in DPM decreased, and the most abundant sulfur components shift to heavier species.
Diesel-exhausts; Diesel-emissions; Particulates; Sulfur-compounds; Fuels
Department of Civil and Environmental Engineering, University of Cincinnati, P.O. Box 210071, Cincinnati, OH, 45221
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Conference/Symposia Proceedings
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Research Tools and Approaches: Exposure Assessment Methods
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Air & Waste Management Association 98th Annual Conference & Exhibition, Minneapolis, Minnesota, June 2005