Simultaneous absorption of NOx and SO2 from flue gas with pyrolusite slurry combined with gas-phase oxidation of NO using ozone

► An oxidation-absorption process for NOx and SO2 removal. ► Ozone oxidized NO into NO2 in gas phase. ► MnO2 in pyrolusite oxidized SO2 and NOx into MnSO4 and Mn(NO3)2 in liquid phase. ► SO2 and NOx removal efficiencies reach 90% and 80%. ► Mn extraction rate reach 85%.