Exhaust gas nitrogen oxide e.g. nitric oxide, treatment system for heat engine, has catalyst with catalytic units having complementary thermal windows, for catalytic activities, respectively operated in high, medium and low temperatures

摘要

The system has an exhaust pipe (16) with a reactor (18) producing non-thermal plasma from exhaust gas received in its inlet. A catalyst (22) arranged in a downstream of the reactor reduces nitrogen oxide. The catalyst has different catalytic units (22a, 22b, 22c) including thermal windows for different catalytic activities. The windows are complementary and are operated in high, medium and low temperatures, respectively.