| abstract |
PROBLEM TO BE SOLVED: To remove nitrogen oxide in industrial exhaust gas from an industrial plant, an internal combustion engine or the like. SOLUTION: 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, Be, Mg, A catalyst composed of at least one metal selected from the group consisting of Ca, Sr and Ba or a compound thereof having a catalytic activity of 1 to 80 g / liter-catalyst and a refractory inorganic oxide is produced in an exhaust gas and an oxidizing atmosphere. Exhaust gas by adsorbing nitrogen oxide in the exhaust gas to the catalyst by contact with the catalyst, and then reducing and purifying the nitrogen oxide adsorbed on the catalyst by intermittently introducing a reducing substance into the exhaust gas This is a method for removing nitrogen oxides therein. [Selection] Figure 1 |