Use of ozone with LNT and MnO2 catalyst for the treatment of residual pollutant for the exhaust gas of an internal engine combustion

A method of treating residual pollutants comprising NO, CO, and hydrocarbons from tailpipes emissions in an exhaust line having a cold part, the method comprising:

• generating ozone from an ozonizer;
• injecting the ozone in a mixing chamber comprising the residual pollutants to form a first mixture;
• converting the first mixture using an MnO2 catalyst to form a second mixture;
• and
• converting the second mixture using an LNT catalyst to an emission mixture comprising NO2, CO2, and H2O,
• wherein the LNT catalyst comprises a precious metal catalyst, a storage material, and a support material, wherein the storage material comprises 15 to 25 wt % barium oxide (BaO), and the support material comprises alumina (Al2O3);
• wherein the ozone, MnO2 catalyst, and LNT catalyst are provided in the cold part of the exhaust line such that the residual pollutants are oxidized in the cold part of the exhaust line in rich or lean conditions;
• wherein the cold part of the exhaust line has a temperature of from about 20° C. to about 150° C.;
• and
• wherein the emission mixture has an NO2 concentration of less than 0.1 mg/km.