| abstract |
(57) [Summary] [PROBLEMS] To treat an exhaust gas by oxidatively decomposing and removing a nitrogen-containing organic compound contained in an exhaust gas containing a nitrogen-containing organic compound, while suppressing by-products of NOx and N 2 O, Provided is a method for efficiently decomposing nitrogen-containing organic compounds therein to make them harmless. SOLUTION: A first-stage reactor and a second-stage reactor are provided in the flow direction of the exhaust gas, and the exhaust gas is supplied to the first-stage reactor, for example, 150 to It is introduced at a temperature of 350 ° C., in which at least a part of the nitrogen-containing organic compound is decomposed into NH 3 and CO, and then introduced into the subsequent reactor. |