Palladium catalyst washcoat supports for improved methane oxidation in natural gas automotive emission catalysts
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United States of America Patent
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Dec 26, 2000
Issued Date -
N/A
app pub date -
Jun 4, 1999
filing date -
Jun 7, 1995
priority date (Note) -
Expired
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Abstract
The invention provides a catalyst which can convert methane, carbon monoxide, and nitrogen oxides in lean, stoichiometric, and rich air/fuel environments. Support (A) of the catalyst comprises an alumina support impregnated with Pd providing lean methane conversions and support (B) of the catalyst comprises ceria/lanthana/alumina impregnated with Pd providing stoichiometric methane conversion. Rhodium may be substituted for all or part of the Pd on an alumina support.
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