Abstract: A catalytic apparatus for exhaust purification, provided in an exhaust path of an internal-combustion engine operable with at least a theoretical air-fuel ratio and a lean air-fuel ratio, is provided with a three-way catalyst (4) having an inner layer (12a) thereof mainly containing rhodium as a noble metal to be activated in an oxygen concentration lowering atmosphere and a surface layer (12b) thereof mainly containing platinum or palladium as a noble metal to be activated in an oxygen concentration increasing atmosphere. In the catalytic apparatus, platinum or palladium in the surface layer is activated in lean operation to perform an HC purifying function effectively. If oxygen is temporarily in short supply during the change from a lean air-fuel ratio of exhaust gas over to a stoichiometric air-fuel ratio, oxygen is supplemented to purify HC by utilizing the O2 storage function of platinum or palladium as the noble metal, whereby the HC purifying rate can be prevented from temporarily suddenly lowering.

Abstract: A fuel tank device has a canister suitably mounted inside a fuel tank. The fuel tank device includes a tank body in which fuel is stored, a filler tube connected at one end to the tank body for supplying the fuel into the tank body, and a canister hung and supported by the edge of an opening formed through the tank body via a support member and a sealing member, for adsorbing and storing evaporative fuel generated in the tank body. The canister is mounted entirely within the tank body and located so as not to be directly exposed to the fuel when the fuel is being supplied from the filler tube.