Palladium catalyst pre-oxidation to reduce light-off temperature
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United States of America Patent
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Feb 13, 2001
Grant Date -
N/A
app pub date -
Oct 30, 1995
filing date -
Oct 30, 1995
priority date (Note) -
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Abstract
The invention is a method for preconditioning a palladium containing automotive catalyst by subjecting the catalyst to oxidation by means of an oxidizing gas containing at least 0.85% oxygen at a temperature of at least 450.degree. C. preferably for at least 15 seconds. This oxidation can be carried out before or after engine shutdown. The catalyst is placed in the exhaust system in a location whereby the catalyst attains this temperature during steady state warm-up operation of the engine.
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