Abstract
Rhodium (Rh) is a critical component of current automotive three-way catalysts (TWCs), particularly with regard to NO x and CO conversion at rich and stoichiometric air–fuel ratios (A/F). Rh supported on CeO 2 was active for NO x and CO conversions but could be deactivated easily by high temperature aging. The cause of the deactivation is ascribed to the sintering of CeO 2. ZrO 2 incorporation into CeO 2 is reported to have high thermal durability in terms of oxygen storage capacity (OSC). There has been no report showing direct experimental evidence that Rh-loaded on CeO 2–ZrO 2 mixed oxides induced effects on TWC performance improvement in the actual automotive exhaust. In the present paper, the Rh-CeO 2 interaction contributing to NO x reduction and the catalytic behavior of Rh-loaded CeO 2–ZrO 2 mixed oxide is addressed. Incorporating CeO 2–ZrO 2 into a catalyst offered significant improvement in light-off and warmed-up performances in model gas test. Newly designed TWC including the Rh/CeO 2–ZrO 2 component were aged and evaluated on an engine dynamometer. Result of engine dynamometer evaluation also revealed that significant improvement in the thermal durability can be achieved by the utilization of the optimized Rh-loaded CeO 2–ZrO 2 mixed oxide.
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