Power plants – Internal combustion engine with treatment or handling of... – Methods
Reexamination Certificate
2005-04-26
2005-04-26
Langel, Wayne A. (Department: 1754)
Power plants
Internal combustion engine with treatment or handling of...
Methods
C423S213200, C423S213500, C423S239100
Reexamination Certificate
active
06883305
ABSTRACT:
In a method and apparatus for removing nitrogen oxides from the exhaust gas of a lean-burn automobile, a CO adsorbent component, which may, for example be made of Pd, Ru or Ir, is contained in an exhaust gas cleaning catalyst which captures NOx when the air-fuel ratio of exhaust gas is higher than theoretical air-fuel ratio, and reduces the captured NOx when the air-fuel ratio of exhaust gad is less than or equal to the theoretical air-fuel ratio. The catalyst, which includes Rh, Pt, and element selected from among the alkaline and alkaline earth metals (Na, Mg, K, Li, Cs, Sr and Ca), and a CO adsorbent material comprising Pd, Ir or Ru, has a CO desorption capacity that reaches at maximum level at a temperature within the range from 200 to 220° C. when its temperature is increased in a He gas flow at the rate of 5 to 10° C./min, after said catalyst is saturated at 100° C. Exhaust gas having an air-fuel ratio higher than theoretical air-fuel and exhaust gas having an air-fuel ratio less than or equal to the theoretical air-fuel ratio are alternately made to flow to the catalyst.
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Iizuka Hidehiro
Kaneeda Masato
Kitahara Yuichi
Kuroda Osamu
Nagayama Kousei
Crowell & Moring LLP
Langel Wayne A.
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