| 摘要 |
PURPOSE:To prolong the time of contact between exhaust gas and the surface of a catalyst and to carry out sufficiently the catalytic reaction by undulating the cell wall surface of a monolithic catalyst carrier for purifying exhaust gas. CONSTITUTION:A sufficiently kneaded material for a monolithic catalyst carrier is charged into a material charge tank 2, and sent into an extruder 5. A motor 4 is operated while exerting pressure by a booster 3, and the material is extruded. A holder 7 for holding an extruded carrier 1 is moved back and forth in the direction as shown by the arrow 8 immediately after a specified amt. of a monolithic body is passed through a die 6 and extruded, and tension or contraction is exerted on the carrier 1. Then a monolithic body is again extruded. Said extrusion, tension, and contraction are repeated to obtain a carrier with a desired capacity which is dried and calcined. Since the cell surface 11 of the monolithic catalyst carrier 1 thus obtained is undulated, the surface area of the carrier is increased, appropriate resistance can be afforded to the gas passage, and catalytic reaction is sufficiently performed. |
