A study was made into thermal deactivation of Pt/Rh/Ce three way conversion (TWC) catalyst by the use of aging engines, as well as the changes in catalytic properties developed by thermal deactivation. As a result, crystallization of Pt and CeO2 and the accompanied decrease in O2 storage capacity were found as factors resulting from the thermal deactivation.To minimize the thermal deactivation of the catalyst, CeO2 became a focus of the study and a method to inhibit CeO2 crystallization was pursued. The results of engine high temperature durability testing on improved catalysts employing the new technique confirmed inhibition effects of thermal deactivation.The study successfully resulted in a new TWC catalyst minimizing thermal deactivation.
A Study on Three Way Conversion Catalyst Thermal Deactivation and improvement
Sae Technical Papers
1988 SAE International Fall Fuels and Lubricants Meeting and Exhibition ; 1988
1988-10-01
Aufsatz (Konferenz)
Englisch
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