The Effects of Oil-Derived Poisons on Three-Way Catalyst Performance 2002-01-1093
Two major deactivation mechanisms of automotive catalysts during road usage are:
1.
thermal aging
2.
poison accumulation of oil-derived poisons such as zinc and phosphorus.
A dynamometer-based aging cycle, incorporating a high-temperature low-poison mode to account for thermal aging followed by a low-temperature high-poison mode to account for poison accumulation, has been developed to allow the examination of catalyst formulations after exposure to both a harsh thermal and chemical aging environment. This type of aging cycle results in dynamometer-aged catalysts that are physically much more similar to road-aged catalysts than thermally-based dynamometer cycles. Using this aging-cycle, Pd-only, Pd-Rh and Pt-Rh light-off catalysts were examined. The Pd-Rh catalyst gave the best overall performance, with equivalent HC light-off performance to the Pd-only catalyst and equivalent NOx performance to the Pt-Rh catalyst.
Citation: Lafyatis, D., Petrow, R., and Bennett, C., "The Effects of Oil-Derived Poisons on Three-Way Catalyst Performance," SAE Technical Paper 2002-01-1093, 2002, https://doi.org/10.4271/2002-01-1093. Download Citation
Author(s):
David S. Lafyatis, Rick Petrow, Chris Bennett
Affiliated:
Johnson Matthey Inc.
Pages: 8
Event:
SAE 2002 World Congress & Exhibition
ISSN:
0148-7191
e-ISSN:
2688-3627
Also in:
Emissions Modeling and General Emissions-SP-1676