METHOD FOR REGENERATING USED EXHAUST-GAS TREATMENT CATALYST, AND EXHAUST-GAS TREATMENT CATALYST USING THE METHOD

摘要

PROBLEM TO BE SOLVED: To provide a method for regenerating a used exhaust-gas treatment catalyst by which the durability of the regenerated exhaust-gas treatment catalyst can surely be kept satisfactorily over a long period of time, and to provide the exhaust-gas treatment catalyst.

SOLUTION: The method for regenerating the used exhaust-gas treatment catalyst 11 having the ash-stuck surface includes: a coarsely crushing step S1 of coarsely crushing the exhaust-gas treatment catalyst 11 to produce coarse chips 12 which accounts for 70-95 wt.% of the total weight of the exhaust-gas treatment catalyst 11 and each of which has the size exceeding the threshold size S (the optional value within 0.105-1.0 mm); a separation step S2 of separating the coarsely-crushed material of the exhaust-gas treatment catalyst 11 into the coarse chips 12 each having the size exceeding the threshold size S and fine powder 13 of the size equal to or smaller than the threshold size S; a finely pulverizing step S3 of finely pulverizing the separated coarse chips 12 into fine powder of ≤0.1 mm average particle size; a kneading step S4 of kneading the fine powder with another raw material; a molding step S5 of molding the obtained kneaded material into the exhaust-gas treatment catalyst; a drying step S6 of drying a green molding of the exhaust-gas treatment catalyst; and a firing step S7 of firing the dried green molding at 615-700°C to obtain the regenerated exhaust-gas treatment catalyst 14.

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