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Durability of Ceramic Catalytic Converters for Motorcycles
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English
Abstract
Motorcycle exhaust emission standards throughout the world are becoming more stringent. Emission control systems utilizing the catalytic converter are already in production in Taiwan for 2-stroke engine motorcycles. Catalysts designed for 2-stroke engines encounter a more severe exhaust environment than do those designed for 4-stroke engines. The two aspects of increased severity are the higher temperatures and higher stresses due to engine vibrations. Precious metal catalysts have been designed to operate in the thermal environment of 2-stroke engines and such catalysts have been successfully applied to both metal and ceramic substrates. However, until now, only the metal substrate catalysts have been utilized in motorcycle application. Ceramic based catalysts have not been considered because the mounting material that holds the catalyst substrate in place did not have enough durability to withstand the thermal/vibrational forces encountered in 2-stroke engine exhaust.
Ceramic substrates have many advantages such as superior high temperature strength, which is especially important for the 2-stroke engine application, flexibility in cell shape and density, and lower cost. To realize these benefits, efforts were made in this study to develop better mounting systems. The results of this effort indicate that the durability requirements of 2-stroke engine can be met with the ceramic catalyst substrates if the improved mounting designs reported in the present study are employed.
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Reddy, K., Scott, P., Hwang, H., and Mooney, J., "Durability of Ceramic Catalytic Converters for Motorcycles," SAE Technical Paper 951768, 1995, https://doi.org/10.4271/951768.Also In
References
- Gulati S. T. Scott P. L. “ Design and Performance of a Ceramic Monolithic Converter System for Motorcycles ” SAE 931543 Proceedings of small Engine Technology Conference Italy 1993
- Gulati S. T. “ Cell Design for Ceramic Monoliths for Catalytic Converter Application ” SAE 881685 SAE Int'l Congress and Exposition Detroit, MI 1988
- Reddy K. P. Gulati S. T. Lambert D. W. Schmidt P. S. Weiss D. S. “ High Temperature Durability of Electrically Heated Extruded Metal Support ” SAE 940782 SAE Int'l Congress and Exposition Detroit. MI 1994
- Mooney J. J. Hwang S. H. Daby K. O. Winberg J. R. “ Exhaust emission Control of Small 4-Stroke Air Cooled Utility Engines ” SAE 941807 SAE Int'l Congress and Exposition Detroit, MI 1994