| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust emission control device capable of suppressing the thermodecomposition of ammonia, in the case of heating an exhaust catalyst with chemical heat storage using the ammonia (NH).SOLUTION: An exhaust emission control device 1 includes an oxidation catalyst 4 arranged in an exhaust pipe 3, and a reactor 8 arranged around the exhaust pipe 3 in a cross-section semi-ring shape for heating the oxidation catalyst 4 with chemical reaction between ammonia and a heat storage material 16. The oxidation catalyst 4 consists of: a cross-section semi-circular catalyst region 13 which is formed of a honeycomb base material 12 to support a catalyst material and where exhaust gas flows; and a cross-section semi-circular wall-shape region 14 which is formed in a wall shape and where the exhaust gas does not flow. The exhaust emission control device 1 further includes: a rotation mechanism for rotating the oxidation catalyst 4; and a motor. The oxidation catalyst 4 has the catalyst region 13 normally located on a side of the reactor 8. When a temperature of the exhaust gas is a predetermined value or higher, the oxidation catalyst 4 is half-rotated to put the catalyst region 13 into the state of being located on the opposite side of the reactor 8. |
