EXHAUST EMISSION CONTROL DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust emission control device excellent in NOx emission control performance.SOLUTION: An exhaust emission control device includes an exhaust emission control catalyst 60 and a control part for controlling NOx emission included in an exhaust gas by alternately varying the concentration of hydrocarbon flowing in the exhaust emission control catalyst 60 between a high concentration region having a relatively high hydrocarbon concentration and a low concentration region having a relatively low hydrocarbon concentration in a predetermined cycle. The exhaust emission control catalyst 60 has a carrier 75, metal catalysts 70, 72 carried in the carrier 75, and an NOx occlusion material 74 having NOx occlusion capacity carried in the carrier 75. The NOx occlusion material 74 includes a barium-titanium complex oxide dissolved with barium 74a and titanium 74b.