Method of regenerating exhaust gas treatment catalyst and exhaust gas treatment catalyst obtained by the method

Abstract

Provided is a method of regenerating an exhaust gas treatment catalysthaving ash adhered to a surface thereof. The method includes a crushing step Sin which the exhaust gas treatment catalystis crushed such that 70 to 95 wt % of the whole exhaust gas treatment catalystbecomes coarse pieceshaving a size exceeding a threshold size S (any value in a range of 0.105 to 1.0 mm); a separating step Sin which the fragments obtained by crushing the exhaust gas treatment catalystare separated into the coarse pieceshaving a size exceeding threshold size S and fine particleshaving a size not larger than the threshold size S; a pulverizing step Sin which the coarse piecesthus separated are pulverized to a fine powder having an average particle diameter of not larger than 0.1 mm; a kneading step Sand a molding step Sin which the fine powder is kneaded with other raw materials and molded into an exhaust gas treatment catalyst; and a drying step Sand a calcining step Sin which the molded precursor is dried and calcined to thus obtain a regenerated exhaust gas treatment catalyst