| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for regenerating a used denitration catalyst, which is deteriorated by adhesion or adsorption of oxo acid ions of arsenic and phosphorus, by removing the oxo acid ions from the used denitration catalyst.SOLUTION: A used denitration catalyst containing titanium oxide (TiO) as a main component is regenerated by performing a regeneration method which includes: bringing the used denitration catalyst into contact with a sodium hydroxide aqueous solution in an amount corresponding to 0.9-1.5 times the saturated water absorption amount of the catalyst to make the sodium hydroxide aqueous solution adhere to the used denitration catalyst; leaving the used denitration catalyst, to which the sodium hydroxide aqueous solution has adhered, for a predetermined time at ordinary temperature or in a warmed state; washing the used denitration catalyst with water; and then washing the used denitration catalyst with acid. |
