| 摘要 |
Disclosed is a saddle type vehicle which comprises: an internal combustion engine (1) that is operated at an air/fuel ratio leaner than the stoichiometric air/fuel ratio; a first catalyst (2A) that is provided in an exhaust channel (7a) for discharging the combustion gas from the internal combustion engine (1); a second catalyst (2B) that is provided in the downstream of the first catalyst (2A) in the exhaust channel (7a); and a secondary air introduction unit (3) for introducing a secondary air to a portion (7a') of the exhaust channel (7a), said portion lying between the first catalyst (2A) and the second catalyst (2B). Each of the first catalyst (2A) and the second catalyst (2B) contains a noble metal component that contains at least one of platinum, rhodium, palladium or gold. The second catalyst (2B) additionally contains an ammonia decomposition component that decomposes ammonia. The ammonia decomposition component contains iridium and barium. Consequently, the NOx removal ratio can be improved in the saddle type vehicle that comprises an internal combustion engine that is operated at an air/fuel ratio leaner than the stoichiometric air/fuel ratio. |
