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Trimetallic Three-Way Catalysts
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English
Abstract
European car manufacturers have traditionally used Pt/Rh or Pd/Rh TWCs with PM loadings of 40-60 g/ft3. New regulations, however have stimulated interest in high Pd loadings (100 g/ft3 or more) in order to drastically reduce HC emissions. Pd is known to have good HC oxidation activity, high thermal stability and is relatively inexpensive. However, it suffers from excessive sensitivity to poisons and is usually associated with poor NOx conversion.
A research program was initiated with the goal of capturing the benefits of high Pd concentrations while minimizing its disadvantages. It was found that trimetal formulations (Pt/Pd/Rh) could achieve high NOx conversions provided the loadings of the PMs were optimized based on a Box-Behnken design.
Data showing the high thermal stability and low H2S emissions of these new “TriMax” catalysts will be presented. Their high performance has led to commercial acceptance by several European car manufacturers.
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Authors
Citation
Punke, A., Dahle, U., Tauster, S., Rabinowitz, H. et al., "Trimetallic Three-Way Catalysts," SAE Technical Paper 950255, 1995, https://doi.org/10.4271/950255.Also In
References
- Engler B. H. Lox E. S. Ostgathe K. Ohata T. Tsuchitani K. Ichihara S. Onodo H. Garr G. T. Psaras D. “Recent Trends in the Application of Tri-Metal Emission Control Catalysts” SAE Paper 940928 1994
- Beckwith P. Bennett P. J. Goodfellow C. L. Brisley R. J. Wilkins A. “The Effect of Three-Way Catalyst Formulation on Sulfur Tolerance and Emissions” SAE Paper 940310 1994
- Beck D. D. Sommers J. W. DiMaggiio C. L. Applied Catalysis B: Environmental 3 1994 205 227
- MTZ Motortechnische Zeitschrift 55 1994 4 214 218