Patent ID: 8713922

Claim:
An engine exhaust purification device comprising an exhaust filter which has a partition wall capable of filtering particulates from exhaust of an engine and an internal space of which is partitioned by the partition wall into a plurality of cell passages extending along the flow of the exhaust, adjacent ones of the cell passages being alternately blocked on an inlet side or an outlet side by closing members to form an inlet-side passage and an outlet-side passage, the inlet-side passage being a cell passage which is open on the inlet side, and the outlet-side passage being a cell passage which is open on the outlet side, wherein the exhaust filter comprises: a urea hydrolysis catalyst supported on a first portion of an inner wall of the inlet-side passage; a first NOx reducing catalyst supported on a second portion of the inner wall of the inlet-side passage downstream of the first portion; a second NOx reducing catalyst supported on a third portion of an inner wall of the outlet-side passage adjacent to the inlet-side passage with the partition wall interposed therebetween, the third portion overlapping with the first portion in a direction of intersection with the flow of the exhaust into the exhaust filter; and a first oxidation catalyst supported on a fourth portion of the inner wall of the outlet-side passage downstream of the third portion, the fourth portion overlapping with the second portion in the direction of intersection.