1993-10-01

Effects of Gasoline Sulfur Level on Exhaust Mass and Speciated Emissions: The Question of Linearity - Auto/Oil Air Quality Improvement Program 932727

Effects of gasoline sulfur content on emissions were measured in a fleet of ten 1989 model year vehicles. Two ranges of sulfur content were examined. In a set of five fuels, reducing sulfur from 450 to 50 ppm, reduced fleet average tailpipe emissions of HC, NMHC and CO each by about 18%, and reduced NOx 8%. The largest effect on HC and CO emissions was observed in FTP Bag 2. This and the absence of any significant effect on engine emissions indicate that sulfur affected the performance of the catalytic converters. The response of HC and NMHC to fuel sulfur content was non-linear and increased as sulfur level was reduced. In the second set of three fuels, reducing sulfur from 50 to 10 ppm reduced HC and NMHC by 6% and CO by 10%, but had no significant effect on NOx. The effects on HC, NMHC and NOx were not significantly different from predictions based on the prior fuel set. The reduction in CO was larger than predicted. Reducing sulfur from 450 to 50 ppm reduced exhaust benzene 21%, and acetaldehyde 35%. Formaldehyde was increased 45%, while 1,3-butadiene was unchanged. The sum of the four toxic air pollutant emissions was reduced 10%. When sulfur was reduced from 50 to 10 ppm, benzene was reduced 12% and the sum of the four was reduced 8%; the other three were not changed significantly. The effect on benzene was larger than predicted from the five-fuel results.

SAE MOBILUS

Subscribers can view annotate, and download all of SAE's content. Learn More »

Access SAE MOBILUS »

Members save up to 18% off list price.
Login to see discount.
Special Offer: Download multiple Technical Papers each year? TechSelect is a cost-effective subscription option to select and download 12-100 full-text Technical Papers per year. Find more information here.
We also recommend:
TECHNICAL PAPER

The EC-X Test Program - Reformulated Gasoline for Lower Vehicle Emissions

920798

View Details

TECHNICAL PAPER

Measurement of Regulated and Unregulated Emissions at Low Ambient Temperature

920004

View Details

JOURNAL ARTICLE

Study of Thermal Characteristics and Emissions during Cold Start using an on-board Measuring Method for Modern SI Car Real World Urban Driving

2008-01-1307

View Details

X