Axial characterization of lightoff and underfloor catalytic converters vehicle-aged on a 5.8 L Corvette
Catalysts taken from the lightoff and underfloor converters of two 1986 Corvette exhaust systems which had been vehicle-aged for 100,000+ miles were cut into 1 inch thick sections along their axis and characterized for lean lightoff and warmed-up performance using a laboratory reactor. Sections were then treated to remove the poisons, and the characterization was repeated. An axial gradient in both lightoff and warmed-up conversion efficiency for HC and CO was, detected within the first 2 inches of both lightoff converters for both vehicles. This activity gradient is in agreement with the gradient in the phosphorus and zinc concentrations found in the front 2--3 inch sections of the lightoff converters. Comparison of these data sets with those obtained after removal of the P and Zn poisons led the authors to conclude that a significant part of the total deterioration of activity can be attributed to phosphorus and zinc poisoning for the front 1 inch (and to a lesser extent for the second 1 inch section) of the lightoff converters.
- OSTI ID:
- 264509
- Report Number(s):
- CONF-9510144-; ISBN 1-56091-704-0; TRN: IM9633%%446
- Resource Relation:
- Conference: International fuels and lubricants meeting and exposition, Toronto (Canada), 16-19 Oct 1995; Other Information: PBD: 1995; Related Information: Is Part Of Developments and advances in emission control technology. SP-1120; PB: 211 p.
- Country of Publication:
- United States
- Language:
- English
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