Patent ID: 8785341
Filing Date: 2014-07-22
Classification: B01D,B01J

Abstract:
1. A method of regenerating an exhaust gas treatment catalyst having ash adhered to a surface thereof, the method characterized by comprising: a crushing step of crushing the exhaust gas treatment catalyst that has been used and has ash adhered to the surface thereof; a separating step of separating the crushed exhaust gas treatment catalyst into coarse pieces having a size exceeding a threshold size S and fine particles having a size not larger than the threshold size S; a pulverizing step of pulverizing the separated coarse pieces into a fine powder; a molding step of molding the pulverized fine powder as a raw material into an exhaust gas treatment catalyst without using the separated fine particles as the raw material; and a calcining step of calcining a molded precursor of the exhaust gas treatment catalyst, wherein the threshold size S has a value not smaller than 0.105 mm.