Numerical Study of the Simultaneous Oxidation of NO and SO2 by Ozone

This study used two kinetic mechanisms to evaluate the oxidation processes of NO and SO 2 by ozone. The performance of the two models was assessed by comparisons with experimental results from previous studies. The first kinetic mechanism was a combined model developed by the author that consisted of 50 species and 172 reactions. The second mechanism consisted of 23 species and 63 reactions. Simulation results of both of the two models show under predictions compared with experimental data. The results showed that the optimized reaction temperature for NO with O 3 ranged from 100~200 °C. At higher temperatures, O 3 decomposed to O 2 and O, which resulted in a decrease of the NO conversion rate. When the mole ratio of O 3/NO was greater than 1, products with a higher oxidation state (such as NO 3, N 2O 5) were formed. The reactions between O 3 and SO 2 were weak; as such, it was difficult for O 3 to oxidize SO 2.