Method of purifying exhaust gas from internal combustion engine
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United States of America Patent
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-
Dec 7, 1999
Issued Date -
N/A
app pub date -
Jun 13, 1997
filing date -
Mar 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
This method comprises bringing exhaust gas from an internal combustion engine, which is operated at a fuel-lean air/fuel ratio, in contact with an iridium-containing catalyst in a first zone and then in contact with a platinum-containing catalyst in a second zone situated downstream of the first zone. This method is effective for exhaust gas from lean burn engines over a wide temperature range of 200 to 500.degree. C., produces less N.sub.2 O in a low-temperature range of 200 to 300.degree. C., and can purify exhaust gas stably and effectively even at a high temperature of 700.degree. C. or over.
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