System and method for purifying an exhaust gas

摘要

A system (S1) for purifying an exhaust gas includes a plasma unit (10 and 20) and a catalyst unit (40). The plasma unit (10 and 20) generates energetic plasma species which react with particulate matters and nitrogen oxides contained in the exhaust gas. The catalyst unit (40) has a catalyst which reacts with the exhaust gas. The plasma unit (10 and 20) is disposed upstream relative to the catalyst unit (40) in a direction of flow of the exhaust gas and the system (S1) provides sequential purification for the particulate matters and the nitrogen oxides.