| 摘要 |
[PROBLEMS] To provide a method of regenerating a catalyst in which not only is the SO2 oxidation ratio of denitration catalyst raised by compounds of Fe, V, etc. lowered to an extremely low level but also the oxidation activity of metallic mercury of the catalyst can be enhanced by regeneration treatment. [MEANS FOR SOLVING PROBLEMS] The method of regenerating a catalyst comprises the steps of impregnating a used denitration catalyst composed mainly of titanium oxide with (a) a mixed aqueous solution containing phosphate ions and oxo acid ions of at least one element selected from among vanadium (V), molybdenum (Mo) and tungsten (W), or (b) an aqueous solution of heteropolyacid compound from phosphorus and at least one element selected from among V, Mo and W, or (c) a mixed aqueous solution of phosphate compound and vanadyl compound, and thereafter carrying out drying. |
