NO x and SO2 were removed from an air mixture in a flow process combining electron beam (EB) irradiation with microwave (MW) irradiation in order to improve the NO x removal efficiency. The addition of the MW irradiation considerably decreased the required EB doses compared to a single EB irradiation: for 80% removal efficiency the removal rate was increased by 21.1% to above 117.4% at initial NO x concentrations ranging from 250 to 1000 ppm. The increased NO x removal efficiency due to the MW irradiation addition was attributed to an intrinsic kinetic rather than a thermal effect. The removal process of SO2 and NO x with a stoichiometric ratio (M) addition of NH3 showed high removal efficiencies, as they were converted into main final products of NH4NO3 and (NH4)2SO4. The rate form of NO x removal (−r NO x = k[NO x ][NH3][R•]) in the simultaneous removal of SO2 and NO x could be converted to a second-order rate according to the EB dose, instead of the irradiation time, and linear testing of this rate form with experimental data showed a good correlation, depending on the M value. The amount of NO x removed in the simultaneous removal of SO2 and NO x exhibited the following linear correlation: ΔC = k[NO x ]o + k o with k = aD m + b and k o/D n = aD + b.

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