Patent ID: 10207223

Abstract:
An exhaust gas purifying device includes a first SCR catalyst converter, an oxidation catalyst converter, a filter section, and a second SCR catalyst converter arranged in series to a flow direction of an exhaust gas. The first SCR catalyst converter includes a pillar-shaped honeycomb structure a cell density of which is from 31 to 78 cells/cm2, a porosity of the partition walls of which is from 50 to 65%, and in which a first SCR catalyst is loaded onto the surfaces of the partition walls and inner portions of pores formed in the partition walls, and an amount of the first SCR catalyst to be loaded onto the surfaces of the partition walls and the inner portions of the pores is from 200 to 500 g/L and an amount of the first SCR catalyst to be loaded onto the inner portions of the pores is from 5 to 80 g/L.