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The response of an exhaust-aged three-way catalyst to perturbations in the feedstream stoichiometry was examined in laboratory experiments. The air-fuel ratio was perturbed using both symmetric and asymmetric cycling and a range of net stoichiometries. The conversions of NO and CO were determined using the cycled feeds and steady feeds of equivalent net stoichiometry. At 550 O C cycling the feed benefited conversion at average air-fuel ratios away from the stoichiometric composition. This effect was more pronounced with asymmetric than symmetric cycles. Cycling the air-fuel ratio of the simulated exhaust gas during warm-up of the catalyst did not significantly benefit either NO or CO conversion.

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