Critical factors affecting automotive sulfate emissions

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:6726149

Krause, B; Bouffard, R A; Karmilovich, T; Kayle, E L

Two recently completed experimental programs provide data on four critical factors affecting automotive sulfate emissions: catalyst selectivity, catalyst age, driving mode and gasoline sulfur level. A fifth factor, excess O/sub 2/ level, is discussed, but was not studied experimentally. In the first program, 20 1975 California model cars each accumulated 80,000 km on fuel containing 300 ppM sulfur. The cars used three different catalyst systems and were tested under four different test conditions: Federal Test Procedure (FTP), the Fuel Economy Test (FET), the Sulfate Emission Test (SET), and 80 km/h cruise. The results showed that SO/sub 4//sup 2 -/ emissions from one of the systems were about three times higher than SO/sub 4//sup 2 -/ emissions from the other two systems. SO/sub 4//sup 2 -/ emissions from all systems reached a peak within the first 10,000 km of the test and declined thereafter. Averaged over the 80,000 km of the test, FTP SO/sub 4//sup 2 -/ emissions from all 20 cars were half the peak value measured at 6400 km and half EPA's previous estimate for SO/sub 4//sup 2 -/ emission from these types of vehicles. Data obtained on the SET cycle indicate that EPA's recent estimate of 20 mg SO/sub 4//sup 2 -/ km for catalyst cars with air pumps operating on 300 ppM sulfur gasoline may also be high. Finally, SO/sub 4//sup 2 -/ emissions as a function of driving cycle were found to be FTP < 80 km/h cruise < SET < FET. In the second program, 4 catalyst systems were tested on fuels containing 24 to 469 ppM sulfur using SET, 64 km/h cruise, and FTP test conditions. Under all test conditions, SO/sub 4//sup 2 -/ emissions were found to be a linear function of gasoline sulfur content.

• OSTI ID: 6726149
• Report Number(s): CONF-760278-26
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
AIR POLLUTION CONTROL
AUTOMOBILES
CATALYSTS
CATALYTIC CONVERTERS
DATA
EQUIPMENT
EXHAUST GASES
EXPERIMENTAL DATA
FLUIDS
FUELS
GASEOUS WASTES
GASES
GASOLINE
INFORMATION
LIQUID FUELS
NUMERICAL DATA
OXYGEN COMPOUNDS
PERFORMANCE
PERFORMANCE TESTING
PETROLEUM PRODUCTS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SULFATES
SULFUR COMPOUNDS
TESTING
TIME DEPENDENCE
VEHICLES
WASTES