Production process of oxidation catalyst apparatus for purifying exhaust gas

摘要

To provide a production process of an oxidation catalyst apparatus for purifying an exhaust gas which enables to oxidize and purify particulate matter in the exhaust gas of an internal combustion engine at a lower temperature. The production process of the oxidation catalyst apparatus 1 for purifying an exhaust gas comprises a step of burning a plurality of metal compounds to obtain a burnt product, a step of mixing and grinding the obtained burnt product with water and a binder which is a sol comprising zirconia to prepare a slurry, a step of applying the slurry to a porous filter base material 2, and a step of burning the porous filter base material 2 to form a porous catalyst layer 3 supported on the porous filter base material 2. The porous catalyst layer 3 has a thickness in a range of 10 to 150 µm and fine pores having a diameter in a range of 0.01 to 5 µm, the total porosity of and the porous filter base material 2 and the porous catalyst layer 3 have a porosity of 35 to 70% as a whole. The porous catalyst layer 3 is a composite metal oxide represented by general formula Y 1-x Ag x Mn 1-y Ru y O 3 wherein 0.01 ‰¤ x ‰¤ 0.15 and 0.005 ‰¤ y ‰¤ 0.2.