| 摘要 |
PURPOSE:To simultaneously remove NOx, HC and CO in a high purification ratio, by using a three-component catalyst consisting of palladium, platinum and/ or rhodium and a heteropoly compound. CONSTITUTION:Soluble salts of palladium, platinum and/or rhodium are prepared and a heteropoly compound is added to the prepared salts in a powdery form to sufficiently stirr and warm the formed mixture. By using the obtained impregnating liquid, the impregnation supporting of a carrier is carried out and, after drying, the supported carrier is calcined. This catalyst impregnating liquid is used to 1,000ml carrier in such an amount that palladium, platinum and rhodium is 5-100 milimole and the heteropoly compound is 0.01-10 milimole to prepare a stirred mixture. |
