Patent ID: 9192920
Filing Date: 2015-11-24
Classification: B01D,B01J

Abstract:
1. A method for regenerating an exhaust gas treatment catalyst whose NO x removal performance is reduced by sulfur dioxides and vanadium included in an exhaust gas discharged from a heavy oil combustion boiler, the exhaust gas treatment catalyst comprising: titanium and silica; and an active component comprising one selected from the group consisting of vanadium and tungsten in a support having an Si content of 10% by mass or more, and the method comprising: immersing the exhaust gas treatment catalyst in an alkali cleaning liquid at a concentration from 0.5 N to 2.0 N so as to remove vanadium oxysulfate on the surface of the exhaust gas treatment catalyst, and subjecting the catalyst to activation treatment with an acid aqueous solution after cleaning the exhaust gas treatment catalyst with the alkali cleaning liquid.