In the present invention, the No. 1 cylinder of an engine is connected to a first exhaust passage and the No. 2 to No. 4 cylinders are connected to a second exhaust passage. A three-way catalyst and a NO.sub.X absorbent are disposed in the first and second exhaust passage, respectively. A ...http://www.google.es/patents/US5778667?utm_source=gb-gplus-sharePatente US5778667 - Method and a device for purifying combustion exhaust gas
Method and a device for purifying combustion exhaust gas
