Method for recycling denitration catalyst
There is provided a method for recycling a catalyst that exhibits a high denitration efficiency at a relatively low temperature and does not cause oxidation of SO 2 in a selective catalytic reduction reaction that uses ammonia as a reducing agent. A method for recycling a denitration catalyst includes a step of removing a used denitration catalyst from a denitration device and then coating the used denitration catalyst with a catalyst component. The catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m 2 /g or more, and the denitration catalyst after recycling is used for denitration at 200° C. or lower.
1. A method for recycling a denitration catalyst, comprising:
a step of removing a used denitration catalyst from a denitration device and then coating the used denitration catalyst with a catalyst component,
wherein the catalyst component contains 43 wt % or more of vanadium pentoxide and has a BET specific surface area of 30 m 2 /g or more, and the denitration catalyst after recycling is used for denitration at 200° C. or lower.
2. The method for recycling a denitration catalyst according to claim 1 , wherein the used denitration catalyst is coated with the catalyst component by impregnating the used denitration catalyst with a chelate compound solution in which vanadium pentoxide is dissolved and then performing firing.
3. The method for recycling a denitration catalyst according to claim 1 , wherein the used denitration catalyst is coated with the catalyst component by spraying a chelate compound solution in which vanadium pentoxide is dissolved onto the used denitration catalyst and then performing firing.
4. The method for recycling a denitration catalyst according to claim 1 , wherein in the catalyst component, an amount of NH 3 desorbed by NH 3 -TPD (TPD: temperature programmed desorption) is 10.0 μmol/g or more.