EXHAUST GAS PURIFICATION CATALYST FOR DIESEL ENGINE

摘要

PURPOSE:To suppress the discharge of particulates in the entire temp. range from a low temp. to a high temp. as well as to maintain a small pressure drop. CONSTITUTION:A honeycomb carrier 1 is provided with a cross flow part 10 formed by alternately and checkerwise blocking the inlet and outlet side openings at the axial core part and a straight flow part 11 with no blocked part around the cross flow part 10. A palladium catalyst is carried on the cross flow part 10 and a platinum catalyst on the straight flow part 11. Since exhaust gas flows mainly in the straight flow part 11 in a low temp. range and flows in the cross flow part 10 as well as in the part 11 in a high temp. range, the oxidation of SO2 is prevented and particulates are captured.