Exhaust emission control device for an internal combustion engine
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United States of America Patent
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Issued Date -
Aug 11, 2005
app pub date -
Jan 6, 2005
filing date -
Jan 8, 2004
priority date (Note) -
Abandoned
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Abstract
A three-way catalyst (30) comprises a microporous catalyst element (30a) having a micropore group whose average pore opening size is smaller than molecular size of HC in a washcoat and a macroporous catalyst element (30b) having a macropore group whose average pore opening size is larger than the molecular size of HC in a washcoat.
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