Low-precious metal/high-rare earth oxide catalysts
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United States of America Patent
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Apr 1, 2003
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N/A
app pub date -
May 19, 1999
filing date -
May 19, 1999
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Abstract
The invention is a three-way catalyst, its method of manufacture, and use for treating exhaust gas generated by a gasoline internal combustion engine. The method comprises coating a substrate with mixed metal oxide particles in an amount of 10-30 wt. % based on the weight of the substrate. The mixed metal oxide comprises at least aluminum and rare earth metals of cerium and lanthanum. Precious metals are then deposited on the oxide coating and comprise at least one of platinum and palladium overcoated with rhodium. The total loading of precious metals is about 5-35 g/ft.sup.3 of the substrate.
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