Automotive sulfate emission data

Conference · Tue Jan 01 04:00:00 EST 1974

OSTI ID:7180483

Somers, J H

Automotive sulfate emissions were measured from catalyst and noncatalyst cars in a series of studies. While two investigations found significant sulfate formation in noncatalyst cars, three studies found only trace levels from noncatalyst cars. All of the investigations showed much higher quantities of sulfate emitted from catalyst cars. Pelleted catalysts had much lower sulfate emissions over low speed Environmental Protection Agency Federal Test Procedures than monolith catalysts. This was probably due to temporary storage of sulfates on the catalyst due to chemical interaction with the alumina pellets. The sulfate compounds were, to a large degree, emitted later under higher speed conditions which resulted in higher catalyst temperatures which decomposed the alumina salt. Future work will be directed towards further elucidation of this storage mechanism as well as determining in detail how factors such as air injection rate and catalyst location affect sulfate emissions.

• OSTI ID: 7180483
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330700* -- Advanced Propulsion Systems-- Emission Control
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUTOMOBILES
CATALYTIC CONVERTERS
CHALCOGENIDES
CHEMICAL REACTIONS
EQUIPMENT
EXHAUST GASES
FEDERAL TEST PROCEDURE
GASEOUS WASTES
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POLLUTION CONTROL EQUIPMENT
SULFATES
SULFUR COMPOUNDS
TEMPERATURE DEPENDENCE
TESTING
VEHICLES
WASTES