Method of purifying exhaust gas from internal combustion engine

Details Method of purifying exhaust gas from internal combustion engine Method of purifying exhaust gas from internal combustion engine

B - Operations, Transporting

01

D

B01D 53/94 (2006.01) B01J 23/46 (2006.01) B01J 35/00 (2006.01) F01N 3/28 (2006.01)

Patent

CA 2144366

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°C, produces less N2O in a low-temperature range of 200 to 300°C, and can purify exhaust gas stably and effectively even at a high temperature of 700°C or over.

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