Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2005-05-03
2005-05-03
Johnson, Christina (Department: 1725)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
C423S213500, C423S213700, C423S247000, C502S325000, C502S328000, C502S330000, C502S339000, C502S340000, C502S344000, C422S169000, C422S170000, C422S177000, C422S180000
Reexamination Certificate
active
06887443
ABSTRACT:
An exhaust gas purifying catalyst comprises a catalytic ingredient including rhodium, at least one of platinum and palladium, at least one of absorption materials for absorbing NOx, a porous carrier, and a monolithic support for supporting the catalytic ingredient. The exhaust gas purifying catalyst includes a plurality of catalytic layers containing at least a part of the catalytic ingredient, and rhodium is contained at least in an outermost layer of the catalytic layers. A rhodium amount in the catalytic ingredient is 0.5 g or more for each liter of the catalyst, and a rhodium amount contained in the outermost layer accounts for 80 wt % or more of a total rhodium amount. A weight of the catalytic layer at the outermost layer is 40 wt % or below of a total weight of the catalytic layers.
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Suga Katsuo
Wakamatsu Hironori
Foley & Lardner LLP
Johnson Christina
Nissan Motor Co,. Ltd.
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