| 摘要 |
PURPOSE:To regenerate a catalyst, in which the sintering of noble metal is generated, by forming a halide of the noble metal on a base material by allowing the catalyst to interact with a halogen to unfasten the sintering of the noble metal and eliminating the halogen from the halide. CONSTITUTION:The sintering of the noble metal is unfastened by forming the halide of the noble metal on the base material by allowing the catalyst for purifying waste gas, which is constituted by carrying the noble metal (e.g. platinum) as an active seed on the inorganic porous base material and in which the sintering of the noble metal is generated, to interact with a halogen (1st process). Next the halogen is eliminated from the halide (2nd process). The 1st process is executed by dipping the catalyst into hydrochloric acid. In the case of using hydrochloric acid, the temp. of the catalyst is preferably 150-200 deg.C to form the halide. And in the 2nd process, the catalyst is preferably heated to 400-600 deg.C. The halogen is eliminated from the halide by the heating. |
