Method and device for purifying exhaust gas of an engine
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United States of America Patent
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Feb 12, 2002
Grant Date -
N/A
app pub date -
Feb 10, 2000
filing date -
Nov 9, 1995
priority date (Note) -
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Abstract
An exhaust manifold (7) of an engine (1) is connected to a three way (TW) catalyst (8a), and the TW catalyst (8a) is connected to an NH.sub.3 adsorbing and oxidizing (NH.sub.3 -AO) catalyst (10a). The engine (1) performs the lean and the rich engine operations alternately and repeatedly. When the engine (1) performs the rich operation and thereby the exhaust gas air-fuel ratio of the exhaust gas flowing into the TW catalyst (8a) is made rich, NO.sub.x in the inflowing exhaust gas is converted to NH.sub.3 in the TW catalyst (8a). The NH.sub.3 is then adsorbed in the NH.sub.3 -AO catalyst (10a). Next, when the engine (1) performs the lean operation and thereby the exhaust gas air-fuel ratio of the exhaust gas flowing into the TW catalyst (8a) is made lean, NO.sub.x in the exhausted gas passes through the TW catalyst (8a), and flows into the NH.sub.3 -AO catalyst (10a). At this time, NH.sub.3 adsorbed in the catalyst (10a) is desorbed therefrom, and reduces the inflowing NO.sub.x.
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