The Effect of High Temperature Ageing on Platinum-Rhodium and Palladium-Rhodium Three Way Catalysts

Paper #:
  • 910175

Published:
  • 1991-02-01
Citation:
Brisley, R., O'Sullivan, R., and Wilkins, A., "The Effect of High Temperature Ageing on Platinum-Rhodium and Palladium-Rhodium Three Way Catalysts," SAE Technical Paper 910175, 1991, https://doi.org/10.4271/910175.
Pages:
17
Abstract:
The durability of platinum-rhodium and palladium-rhodium three way catalysts has been investigated after ageing at elevated temperatures. Catalysts were subjected to inlet temperatures of between 780 and 960 °C for periods up to 100 hours on an engine bench. It may be concluded that platinum-rhodium catalysts have a better resistance to ageing at catalyst inlet temperatures above 840 °C than palladium-rhodium catalysts at the same loading. A new formulation palladium-rhodium catalyst loaded at 60 g/ft3 and a ratio of 9:1 showed substantially improved high temperature durability.
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