Method for reducing nitrous oxide and reducing device

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PROBLEM TO BE SOLVED : To provide a method and an apparatus for reduction of nitrous oxide capable of decomposing nitrous oxide contained in exhaust gas discharged at temperatures near atmospheric temperature, efficiently at low costs without use of a catalyst. SOLUTION : The exhaust gas containing nitrous oxide is reduced to nitrogen, oxygen and water by plasma with ammonia as a reducing agent and without a catalyst. An atmospheric-pressure equilibrated plasma is used as the plasma, and the reducing agent is charged in two or more stages in a divided manner so as to control re-formation of nitrous oxide and decompose nitrous oxide in the exhaust gas nearly completely. Preferably, nitrous oxide in the exhaust gas is concentrated in a preceding stage. COPYRIGHT : (C)2011, JPO&INPIT