Abstract
By using a combination of oxygen buffering capacity (OBC) and oxygen storage capacity (OSC) measurements, the redox behaviour of a Pt/CeTbO x catalyst is compared to that of a classic model TWC system: Pt/CeO 2. The results reported here show that the redox efficiency of the Pt/CeTbO x catalyst is much better, especially at low temperature operation conditions such as those occurring during the cold start of engines. The catalyst containing terbium also shows lower ‘light-off’ temperatures for both methane and carbon monoxide oxidation.
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