This content is not included in your SAE MOBILUS subscription, or you are not logged in.
The Kinetics of SO2 Oxidation for Various Catalyst Compositions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1976 by SAE International in United States
Annotation ability available
The sulfur dioxide to sulfur trioxide conversion has been measured for three different automotive exhaust catalysts. Two of the catalysts were 1975 production catalysts (Engelhard IIB and Matthey-Bishop 3C) and the third is a palladium catalyst on a monolith support. The carbon monoxide and propylene conversions were also measured so that the activity of the three catalysts for these gases could be compared to their sulfur dioxide activity. The measurements were made using a flow reactor with simulated exhaust gas and show that, while the carbon monoxide and propylene conversions were very similar for all three catalysts, there was a wide range of sulfur dioxide conversions. At 525°C and 73,000 hr-1 space velocity the sulfur dioxide conversion was 70% for the Engelhard IIB, 40% for the Matthey-Bishop 3C and from 25 to 70% for the palladium catalyst. The palladium catalyst has a range of conversions under these conditions which are associated with different states of the catalyst. It is not clear which state prevails in an automobile exhaust system.
CitationHammerle, R. and Truex, T., "The Kinetics of SO2 Oxidation for Various Catalyst Compositions," SAE Technical Paper 760090, 1976, https://doi.org/10.4271/760090.
- Hammerle R. H. and Mikkor M., “Some Phenomena Which Control Sulfuric Acid Emission from Automotive Catalysts.” Paper 750097 presented at SAE Automotive Engineering Congress, Detroit, February, 1975.
- Mikkor M., Hammerle R. H. and Truex T. J., “Effects of Hydrocarbons, Carbon Monoxide and Oxygen on Sulfuric Acid Emission from an Automotive Catalyst.” Paper No. 43, Symposium on Auto Emission Catalysis, Division of Colloid and Surface Chemistry, American Chemical Society 170th Annual Meeting, Chicago, August, 1975.
- Trayser D. A., Creswick F. A., Blosser E. R., Bauer R. F. and Pierson W. R., “Effect of Catalyst History on Sulfate Emission.” to be presented at SAE Automotive Engineering Congress, Detroit, February, 1976.
- Kummer J. T., “Oxidation of CO and C2H4 by Base Metal Catalysts Prepared on Honeycomb Supports.” Advances in Chemistry Series A.C.S., No. 143, p. 178, 1975.
- Bradow R. L. and Moran J. B., “Sulfate Emissions from Catalyst Cars A Review.” Paper 750090 presented at SAE Automotive Engineering Congress, Detroit, February, 1975.
- Holt E. L., Bachman K. C., Leppard W. R., Wigg E. E. and Somers J. H., “Control of Automotive Sulfate Emissions.” Paper 750683 presented at SAE Fuels and Lubricants Meeting, Houston, Texas, June, 1975.