| abstract |
The present invention relates to a catalyst regeneration method capable of reducing the SO 2 oxidation rate of a denitration catalyst increased by a compound such as Fe or V to an extremely low level and improving the oxidation activity of metal mercury of the catalyst by regeneration treatment. provide. SOLUTION: Used denitration catalyst mainly composed of titanium oxide includes (a) phosphate ion and oxo of one or more elements selected from vanadium (V), molybdenum (Mo) and tungsten (W). A mixed aqueous solution containing acid ions, (b) a heteropoly acid compound aqueous solution of phosphorus and one or more elements selected from V, Mo and W, or (c) a mixed aqueous solution of a phosphate compound and a vanadyl compound. A method for regenerating a catalyst comprising a step of drying after impregnation. [Selection figure] None |