Exhaust gas purifying system

Details Exhaust gas purifying system Exhaust gas purifying system

2007-07-24

2007-07-24

Denion, Thomas (Department: 3748)

Power plants

Internal combustion engine with treatment or handling of...

By means producing a chemical reaction of a component of the...

C422S168000, C422S169000, C422S170000

Reexamination Certificate

active

11183980

ABSTRACT:
An exhaust gas purifying system of the present invention comprises a first catalyst which contains a noble metal and reduces hydrocarbons contained in exhaust gas, and a second catalyst which is disposed downstream of the first catalyst and contains β-zeolite. In the exhaust gas purifying system, a mixed gas having an air-fuel ratio of not less than 25 is burned in an internal combustion engine, and the internal combustion engine discharges the exhaust gas having an oxygen concentration of not less than 4% continuously or intermittently.

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