A study has been made of potential methods for controlling sulfate emission from oxidation catalyst-equipped vehicles. The methods considered included operating condition and catalyst changes, as well as the use of a vehicle trap for sulfate. Emissions of sulfate from non-catalyst cars were also measured. The only engine operating variable we found to significantly lower sulfate emission was exhaust gas 02 level. Pelleted catalysts emitted lower amounts of sulfate during low speed operation than did monoliths. Catalyst age was found to be an important factor. Pt catalysts gave somewhat higher sulfate emissions than Pt-Pd catalysts. Vehicle sulfate traps containing CaO-based pellets achieved almost complete sulfate removal from the exhaust for 40,000 km, but pressure drop through the trap became excessive as the sorbent swelled with age. /GMRL/

  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • Holt, E L
    • Bachman, K C
    • Leppard, W R
    • Wigg, E E
  • Publication Date: 1975-6

Media Info

  • Pagination: 11 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00099684
  • Record Type: Publication
  • Report/Paper Numbers: SAE #750683
  • Files: TRIS
  • Created Date: Nov 18 1975 12:00AM