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Simultaneous removal of NO  x  and SO 2 by MgO combined with O 3 oxidation was studied. The effects of the O 3 /NO molar ratio, oxidation temperature, and oxidation residence time on N 2 O 5 decomposition and O 3 consumption distributions were systematically illustrated, which is of great significance for improving NO  x  removal efficiency and reducing O 3 consumption in practical application. When the O 3 /NO molar ratio was greater than 1.0, the highest N 2 O 5 yield was achieved at 90 °C. The NO  x  removal efficiency reached 96.5% at an O 3 /NO molar ratio of 1.8. The oxidation temperature increased from 90 to 130 °C, resulting in the decrease of N 2 O 5 yield, the improvement of O 3 -ICC (O 3 invalid cycle consumption) caused by N 2 O 5 decomposition, and the decrease of NO  x  removal efficiency from 96.5 to 76%. Besides, the effects of pH, SO 2 concentration, and MgSO 3 addition on NO  x  removal efficiency were also investigated. The results showed that the removal efficiency of NO  x  decreased with the increase of SO 2 concentration, while MgSO 3 addition into MgO slurry could promote the absorption of NO 2 due to the reaction between NO 2 and SO 3  2- .

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Simultaneous Removal of NOx and SO2 by MgO Combined with O3 Oxidation: The Influencing Factors and O3 Consumption Distributions