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 catalyst 11 having ash adhered to a surface thereof. The method includes a crushing step S1 in which the exhaust gas treatment catalyst 11 is crushed such that 70 to 95 wt % of the whole exhaust gas treatment catalyst 11 becomes coarse pieces 12 having a size exceeding a threshold size S (any value in a range of 0.105 to 1.0 mm); a separating step S2 in which the fragments obtained by crushing the exhaust gas treatment catalyst 11 are separated into the coarse pieces 12 having a size exceeding threshold size S and fine particles 13 having a size not larger than the threshold size S; a pulverizing step S3 in which the coarse pieces 12 thus separated are pulverized to a fine powder having an average particle diameter of not larger than 0.1 mm; a kneading step S4 and a molding step S5 in which the fine powder is kneaded with other raw materials and molded into an exhaust gas treatment catalyst; and a drying step S6 and a calcining step S7 in which the molded precursor is dried and calcined to thus obtain a regenerated exhaust gas treatment catalyst 14.

Dependencies are inferred from the claim text.