| abstract |
An exhaust gas purification apparatus that exhibits high exhaust gas purification performance using palladium is provided. A single-cylinder four-cycle engine 12, a carburetor 13 for supplying fuel by intake negative pressure of the engine 12, an exhaust pipe 14 and an exhaust muffler 15 connected to an exhaust port 12B of the engine 12, and an exhaust muffler 15 In a motorcycle exhaust purification device 10 including a catalytic converter 30 provided therein, a secondary air introduction device 20 for introducing fresh air into the exhaust pipe 14 is provided upstream of the catalytic converter 30, and the catalytic converter is provided. 30 is configured to support a noble metal containing palladium (Pd) and rhodium (Rh), the component ratio (weight ratio) of the noble metal is Pd / Rh = 20/1 to 8/1, and the amount of noble metal supported is 1059.44 to 2648.60 g / m 3 . [Selection] Figure 1 |