Patent ID: 7521031

Claim:
A method for treating exhaust gas using a first plasma reactor and a second plasma reactor that are operationally connected in series along an exhaust gas line, the method comprising: a first step of adsorbing target components including NO x in the exhaust gas with an adsorbent, introducing a nitrogen gas with an oxygen concentration of 10 vol % or less and a purity of 90 vol % or more into the adsorbent, and applying first nonthermal plasma of the nitrogen gas to the adsorbent by generating an electric discharge, thus causing desorption of the target components and regeneration of the adsorbent; and a second step of reducing NO x to N 2 by further applying second nonthermal plasma to the target components desorbed by the first nonthermal plasma, wherein the first step is performed in the first plasma reactor, and the second step is performed in the second plasma reactor, the second plasma reactor following or being integrated with the first plasma reactor.