Patent ID: 7300640
Filing Date: 2007-11-27
Classification: B01D,B01J

Abstract:
1. A cleaning process of exhaust gas which comprises the steps of: bringing exhaust gas containing at least one of nitrogen oxides or organic solvent into contact with a cleaning agent comprising metal as a reductive cleaning agent component and metal oxide as an oxidative cleaning agent component or comprising lower valent metal oxide as a reductive cleaning agent component and higher valent metal oxide as an oxidative cleaning agent component while heating them, wherein the combination of said metal and said metal oxide is Cu and CuO, Ni and NiO, Ru and RuO conducting at least one of reduction of nitrogen oxides by the reductive cleaning agent component or oxidative decomposition of organic solvent by the oxidative cleaning agent component, simultaneously detecting a variation of a constitutional ratio between the reductive cleaning agent component and the oxidative cleaning agent component with the progress of oxidation-reduction reaction, supplying correction gas when the constitutional ratio deviates from a predetermined control range, and restoring the constitutional ratio within the control range.