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Three-Way Catalyst Performance Using Minimized Rhodium Loadings
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English
Abstract
The reduction of precious metal usage especially the rhodium content for three-way catalysts application due to limited resources and high precious metal prices seems to be favoured worldwide.
Various platinum-rhodium and palladium-rhodium catalysts with different precious metal loadings and increasing ratios as well as catalysts containing no rhodium, i.e. only platinum-palladium were evaluated. Engine dynamometer sweep data and vehicle tests (US FTP 75) indicated that several catalyst formulations exhibit three-way catalyst performance even after high temperature engine aging and severe laboratory oven air treatment.
Thus, the application of three-way catalysts with improved alumina washcoat technology and reduced loadings of rhodium and platinum seems to be possible.
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Citation
Engler, B., Koberstein, E., and Volker, H., "Three-Way Catalyst Performance Using Minimized Rhodium Loadings," SAE Technical Paper 872097, 1987, https://doi.org/10.4271/872097.Also In
References
- Taylor K.C. Automobile Catalytic Converters Springer-Ver1ag Berlin, Heidelberg, New York, Tokyo 1984
- Gandhi H.S. Yao H.C. Stepien H.K. A.C.S. Symposium Ser. 178 American Chemical Society Washington, D.C. 1982
- Koberstein E. Engler B.H. Völker H. Catalytic Automotive Exhaust Purification - The European Situation 1985 SAE Paper No. 852094 1985
- Engler B.H. Koberstein E. The Use of Three-Way Catalysts under Extreme Operation Conditions Int. Conf. on Vehicle Emissions and their impact on European Air Quality London 1987
- Öser P. Volker H. Optimization of Catalyst Systems with Emphasis on Precious Metal Usage 1987 SAE International Fuels & Lubricants Meeting & Exposition Toronto, Canada 1987