The Effects of Oil-Derived Poisons on Three-Way Catalyst Performance
2002-01-1093
03/04/2002
- Event
- Content
- 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. - 1.
- Pages
- 8
- 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.