Novel, Pt-only, electropositively promoted by Na, monolithic catalytic converters are developed and tested under simulated exhaust conditions within 150-500°C. The effects of CeO 2 and La 2 O 3 additives on the novel TWC washcoat are also studied. The performance of these simple in constitution, with one precious metal TWCs, was found to be well compared to that of a commercial bimetallic (Pt/Rh)-TWC.
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