| 摘要 |
PROBLEM TO BE SOLVED: To adjust a catalyst carrier layer and to produce a catalyst excellent in performance and efficiency by controlling the flow velocity of excess slurry dropping from the lower end surface of a monolithic carrier and forming a thickness distribution in the layer from the center of the cross section perpendicular to the axial direction of the carrier toward the periphery. SOLUTION: A ceramic honeycomb carrier 1 is prepared, and a suction tank 4 below the carrier 1 is coated by using a device equipped with a resistance 4 and a support 3. Slurry 5 is charged into a hopper 6, after excess slurry is sucked/removed by using a suction negative pressure, the slurry is dried/ burned. The flow velocity of the dropping excess slurry is changed by a resistance 2, and a thickness distribution is formed in a catalyst support layer. Many coating layers are formed in a central part in which exhaust gas flows easily, and the coating layer in a peripheral part in which the flow of the exhaust gas is slight is reduced. In this way, the excess/shortage of coating is reduced, respectively, and a catalyst component is made to function efficiently. |
