Device for treating exhaust gas from engine and method for manufacturing said device

A device for treating exhaust gas from an engine, the device comprising

• a catalytic converter provided in an exhaust gas passage of an engine;
• and
• a filter device provided on a downstream side of the catalytic converter in the exhaust gas passage,
• the catalytic converter includes a catalyst on a front stage that includes a first catalyst which exhibits activity in oxidation reaction of unsaturated hydrocarbons whose number of carbon atoms is 6 to 9, a catalyst on a rear stage that is provided on a downstream side of the catalyst on the front stage and includes a second catalyst which exhibits activity in oxidation reaction of saturated hydrocarbons whose number of carbon atoms is 5 or smaller, and a catalyst container housing the catalyst on the front stage and the catalyst on the rear stage together,
• the filter device including a filter porous and collecting particulate matter in exhaust gas and a filter container housing the porous filter, the exhaust gas passing through pores of the filter from surfaces of the filter and being discharged,
• the catalytic converter being connected to an exhaust manifold of the engine via a connecting pipe,
• the filter device being directly connected to the catalytic converter,
• a catalyst being supported on the surfaces of the filter and inner surfaces of the pores exhibiting activity in oxidation reaction of saturated hydrocarbons whose number of carbon atoms is 5 or smaller,
• the catalyst of the filter device being supported on the surfaces of the filter more thickly than on the inner surfaces of the pores,
• the first catalyst of the catalytic converter producing the saturated hydrocarbons by cracking of the unsaturated hydrocarbons, and
• the second catalyst of the catalytic converter and the catalyst of the filter purifying the saturated hydrocarbons.