A comparative study of the catalytic and non-catalytic ozone based processes for simultaneous of SO2 and NOX removal

Abstract

Ozonation process alone is not sufficient to remove both the SO2 and NOX gases, when treated simultaneously. Therefore in this work, a suitable technique to remove SO2 and NOX simultaneously has been evaluated using combination of O3, H2O2 and a solid catalyst. OMS-2, a manganese based catalyst have been incorporated with O3 and H2O2 for enhanced radical generation. This preferably enhances the oxidation of SO2 and NOx species in aqueous medium simultaneously. The role of some important process parameters have been tested on the performance of SO2 and NOX absorption. To get the maximum removal of SO2 and NOX, the neutral pH, temperature close to 300–320 K, and H2O2 at 0.2 mol L−1 concentrations was found to be the optimum condition. The use of catalyst (approximately 2 g L−1) + O3 + H2O2 shows promising results on the removal of SO2 and NOX. In addition to that, the kinetics of the catalytic ozonation and peroxone removal of SO2 and NO2 has been evaluated. The cost estimation study for the ozone and peroxone based catalytic processes has been presented with comparison of the respective flue gas %removal.