Patent ID: 8835340
Filing Date: 2014-09-16
Classification: B01D,B01J

Abstract:
1. A method of regenerating an exhaust gas treatment catalyst having ash adhering to a surface thereof, the method comprising: a used catalyst crushing step of crushing the exhaust gas treatment catalyst that has been used; 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 used catalyst 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; a precursor calcining step of calcining a molded precursor of the exhaust gas treatment catalyst; a newly-made catalyst crushing step of crushing the exhaust gas treatment catalyst that has been newly made; a slurrying step of slurrying the crushed newly-made exhaust gas treatment catalyst; a slurry coating step of coating a surface of a base obtained by the calcination in the precursor calcining step with the slurry liquid; and a coating calcining step of calcining the base coated with the slurry liquid at a higher temperature than a calcination temperature during production of the crushed newly-made exhaust gas treatment catalyst, wherein the threshold size S has a value not smaller than 0.105 mm.