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Improvement of Engine Emissions Tower Three-Way Catalyst by the Periodic Operations
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English
Abstract
The effects of “periodic operation (variations of both A/F modulation width and their frequency)” on the activities of fresh and aged Pt/Rh catalysts were systematically evaluated on engine dynamometer in terms of A/F and cold-start performance. A/F modulation width and its frequency were varied from ±2 to ±10% A/F and from 0.5 to 5 Hz, respectively. The periodic operation effects for both catalysts were the most preferable for diminishing THC emission and a little effect was obtained for CO emission. A remarkable improvement of NOx emission on the aged catalyst was confirmed, although a medium effect was appeared on the fresh catalyst.
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Citation
Matsunaga, S., Yokota, K., Muraki, H., and Fujitani, Y., "Improvement of Engine Emissions Tower Three-Way Catalyst by the Periodic Operations," SAE Technical Paper 872098, 1987, https://doi.org/10.4271/872098.Also In
References
- Sobukawa H. Shinjoh H. Muraki H. Fujitani Y. Nippon Kagaku Kaishi 1985 2 176
- Yokota K. Muraki H. Fujitani Y. SAE Paper No. 850129 1985
- Holl W. H. SAE Paper No. 730533 1973