Method for regenerating exhaust gas treatment catalyst
View Patent ↗Provided is an exhaust gas treatment catalyst including: a de-NOx catalyst; and a coating layer being provided on a surface of the de-NOx catalyst and containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates. In a method for regenerating an exhaust gas treatment catalyst of the present invention, the coating layer of the de-NOx catalyst on which VOSO 4 is deposited is removed with an acid, and after the removal of the coating layer, a coating layer containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates is again provided.
1. A method for regenerating an exhaust gas treatment catalyst, in which a coating layer containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates is provided on a surface of a de-NOx catalyst, and VOSO 4 is deposited on the coating layer, the method comprising removing only the coating layer of the de-NOx catalyst with an acid.
2. The method for regenerating an exhaust gas treatment catalyst according to claim 1 , further comprising, after the removal of the coating layer with the acid, providing again a coating layer containing at least one selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates.
3. The method for regenerating an exhaust gas treatment catalyst according to claim 2 , wherein the coating layer provided again contains calcium carbonate.
4. The method for regenerating an exhaust gas treatment catalyst according to claim 1 , wherein hydrochloric acid is used as the acid.