METHOD FOR COATING CATALYST ON DIESEL PARTICULATE FILTER

摘要

The present invention relates to a method for coating a catalyst on a diesel particulate filter which is capable of uniformly coating a reduction catalyst on air holes of the filter body. A method for coating a catalyst on a diesel particulate filter according to an embodiment of the present invention includes: a preparing step of preparing a filter body by using a material having a plurality of air holes to filter exhaust gas, wherein the filter body includes a plurality of inlet channels opened in an introducing direction of the exhaust gas and a plurality of outlet channels opened in an output direction of the exhaust gas, and the inlet and outlet channels are alternately adjacent to each other; a primary coating step of primarily coating a reduction catalyst by allowing the filter body to immerge into wash coat solution containing the reduction catalyst; and a secondary coating step of secondarily coating the reduction catalyst on an area of the filter body on which the distribution of the primarily coated reduction catalyst is relatively low by providing suction pressure to a channel opposite to a channel selected from the inlet and outlet channels of the primarily coated filter body while supplying the wash coat solution containing the reduction catalyst to the selected channel.