DEACTIVATION OF THREE-WAY CATALYSTS BY FUEL CONTAMINANTS:--LEAD, PHOSPHORUS AND SULFUR

Poisoning of a typical platinum-rhodium (Pt-Rh) automotive three-way catalyst (TWC) was determined as a function of lead (Pb), sulfur (S) and phosphorus (P)fuel levels, thermal aging and sulfur dioxide content in the evaluation fuel. In an attempt to mimic the effect on TWCs of misfueling with Pb levels typical of commercially available leaded fuels, TWC activities were severely poisoned. Upon reverting to fuel containing trace Pb levels, the CO activity was restored, but the NO and HC activities were only partially recovered. The Pt-Rh TWCs were poisoned by the exhaust from fuel containing 0.03 wt % S, but not by that from fuel containing up to 8 mg P/gal (2.1 g/cu m).

  • Availability:
  • Supplemental Notes:
    • Presented at SAE Fuels and Lubricants Meeting, Houston, Texas, 1-4 October 1979.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • WILLIAMSON, W B
    • Gandhi, H S
    • Heyde, M E
    • Zawacki, G A
  • Publication Date: 1979-10

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00308649
  • Record Type: Publication
  • Report/Paper Numbers: SAE 790942, HS-029 248U
  • Files: HSL, TRIS
  • Created Date: Apr 22 1984 12:00AM