Axial Characterization of Lightoff and Underfloor Catalytic Converters Vehicle-Aged on a 5.7 L Corvette

952416

10/01/1995

Event
1995 SAE International Fall Fuels and Lubricants Meeting and Exhibition
Authors Abstract
Content
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″ 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″ 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″ sections of the lightoff converters. Comparison of these data sets with those obtained after removal of the P and Zn poisons led us to conclude that a significant part of the total deterioration of activity can be attributed to phosphorus and zinc poisoning for the front 1″ (and to a lesser extent for the second 1″ section) of the lightoff converters.
Meta TagsDetails
DOI
https://doi.org/10.4271/952416
Pages
16
Citation
Beck, D., Monroe, D., DiMaggio, C., and Sommers, J., "Axial Characterization of Lightoff and Underfloor Catalytic Converters Vehicle-Aged on a 5.7 L Corvette," SAE Technical Paper 952416, 1995, https://doi.org/10.4271/952416.
Additional Details
Publisher
Published
Oct 1, 1995
Product Code
952416
Content Type
Technical Paper
Language
English