Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Reexamination Certificate
2004-09-06
2008-09-09
Vanoy, Timothy C (Department: 1793)
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
C502S302000, C502S303000, C502S304000, C502S325000, C502S349000
Reexamination Certificate
active
07422731
ABSTRACT:
The invention provides a catalyst for catalytic direct decomposition of nitrogen oxides contained in exhaust gases wherein fuel is supplied and subjected to combustion under periodic rich/lean conditions and the resulting exhaust gases are brought into contact therewith, which catalyst comprises:(A) a first catalyst component comprising at least one metal selected from the group consisting of rhodium and palladium supported on zeolite;(B) a second catalyst component comprising at least one selected from the group consisting of(a) ceria,(b) praseodymium oxide, and(c) a mixture and/or a composite oxide of oxides of at least two elements selected from the group consisting of cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum; and(C) a third catalyst component comprising(a) at least one selected from the group consisting of platinum, rhodium, palladium and oxides thereof, and(b) a carrier.
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Nakatsuji Tadao
Ohno Hiroshi
Honda Motor Co. Ltd.
Vanoy Timothy C
Wenderoth , Lind & Ponack, L.L.P.
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