Exhaust gas purification catalyst
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United States of America Patent
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Issued Date -
Sep 28, 2006
app pub date -
Mar 9, 2006
filing date -
Mar 24, 2005
priority date (Note) -
Abandoned
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Abstract
In an exhaust gas purification catalyst in which a catalytic coating containing plural kinds of aluminas and plural kinds of oxygen storage components each carrying a catalytic precious metal is coated on a honeycomb support, the catalytic coating is formed of an upper layer and a lower layer, palladium is carried on a first alumina and a Ce--Zr--La--Y-alumina compound having oxygen storage capacity in the lower layer, platinum is carried on a second alumina in the upper layer, and rhodium is carried on a third alumina and a Ce--Zr--Nd mixed oxide having oxygen storage capacity in the upper layer.
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