Engine device

An engine device comprising an engine which is operated by a fuel containing at least ammonia,

• the engine device comprising:
• an exhaust passage through which an exhaust gas exhausted from the engine is flowed in an exhaust direction;
• in the exhaust passage, a selective reduction catalyst which reduces nitrogen oxides contained in the exhaust gas by a reducing agent;
• in the exhaust passage on an upper stream side than the selective reduction catalyst in the exhaust direction, an ammonia adsorption catalyst which adsorbs ammonia contained in the exhaust gas;
• a first bypass passage connected to the exhaust passage to bypass the ammonia adsorption catalyst;
• a first path switch valve which switches whether a flow of the exhaust gas is to pass through or around the ammonia adsorption catalyst;
• a second bypass passage connected to the exhaust passage to bypass the ammonia adsorption catalyst and the selective reduction catalyst;
• and
• a second path switch valve which switches whether the flow of the exhaust gas is to pass through or around the selective reduction catalyst.