| abstract |
A method for removing nitrogen oxides in industrial exhaust gas from industrial plants, internal combustion engines, and the like. At least one noble metal selected from the group consisting of Pt, Pd, Rh and Ru or a compound thereof 0.1-30 g / liter-catalyst and Li, K, Na, Rb, Ce A catalyst comprising a catalytically active component comprising at least one metal selected from the group consisting of Be, Mg, Ca, Sr and Ba or a compound thereof, 1 to 80 g / liter-catalyst, and a refractory inorganic oxide, The exhaust gas is brought into contact with an oxidizing atmosphere to adsorb nitrogen oxides in the exhaust gas to the catalyst, and then a reducing substance is intermittently introduced into the exhaust gas to reduce the nitrogen oxides adsorbed on the catalyst. This is a method for removing nitrogen oxides in exhaust gas by purification. [Selection] Figure 1 |