Catalyst Considerations for Diesel Converters

A theory of diesel exhaust catalysis using an oxidation flow-through type catalyst to reduce particulate emissions is explained. The effects of converter design, catalyst support materials, and the use of noble metals for light and heavy duty applications are discussed. Experiments were performed to determine, 1) the sulfur storage and release characteristics of alumina and silica catalyst support materials and 2) the ability of platinum and palladium to oxidize SO₂ to sulfate particulate. Light duty FTP and heavy duty transient results are also presented.