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Advanced Three-Way Catalysts - Optimisation by Targeted Zoning of Precious Metal
Technical Paper
2005-01-2158
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Emissions from (and cost of) three-way catalysts can minimised by targeted application of PGM along the catalyst's length rather than the conventional homogeneous distribution. Experiments are described demonstrating pollutant conversion as a function of catalyst length during the European MVEG-B cycle. It is shown that most pollutant conversion occurs on the front portion, and that therefore the most effective catalysts have the majority of the PGM content there. Further analysis of the three legislated pollutants CO, HC and NOx leads to insights about the optimum distribution of Pt, Pd and Rh within the catalyst. In advantageous circumstances bi or trimetallic systems can be partially replaced with Rh-only systems with significant cost and backpressure benefits. Further experiments comparing zoned catalysts with current catalysts whose PGM is homogeneously distributed are described, demonstrating additional performance benefits.
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Authors
- N. R. Collins - Johnson Matthey Environmental Catalyst Technologies, Orchard Road, Royston, Hertfordshire, UK
- J. A. Cooper - Johnson Matthey Environmental Catalyst Technologies, Orchard Road, Royston, Hertfordshire, UK
- D. Morris - Johnson Matthey Environmental Catalyst Technologies, Orchard Road, Royston, Hertfordshire, UK
- A. Ravenscroft - Johnson Matthey Environmental Catalyst Technologies, Orchard Road, Royston, Hertfordshire, UK
- M. V. Twigg - Johnson Matthey Environmental Catalyst Technologies, Orchard Road, Royston, Hertfordshire, UK
Citation
Collins, N., Cooper, J., Morris, D., Ravenscroft, A. et al., "Advanced Three-Way Catalysts - Optimisation by Targeted Zoning of Precious Metal," SAE Technical Paper 2005-01-2158, 2005, https://doi.org/10.4271/2005-01-2158.Also In
References
- Hu, Z. Heck, R.M. “High temperature Ultra stable Close-Coupled Catalysts” SAE 950259 1995
- Collins, N. R. Chandler, G. R. Brisley, R. J. Andersen, P. J. Shady, P. J. Roth, S. A. “Catalyst Improvements to meet European Stage III and ULEV Emissions Criteria” SAE 960799 1996
- Andersen, P. J. Ballinger, T. H. “Improvements in Pd/Rh and Pt/Rh Three Way Catalysts” SAE 990308 1999
- Collins, N. R. Cooper, J. A. Gregory, D. Morris, D. Tancell, P. Twigg, M. V. Will, N. S. “High Temperature Durable Three-way Catalysts to meet European Stage IV Emission Requirements” SAE 2002-01-0351 2002