Absorptions of NO by neutral and alkaline solutions of KMnO 4 were performed in this study to clarify the reaction kinetics. The experiments were mainly carried out under 50°C, which is the common operating temperature for wet scubbers.According to the assumption that the absorption of NO was developed under the fast pseudo-mth reaction regime, which is verified in the experiments, the absorption rate of NO into KMnO 4 solutions is found to be negative half-order dependent on P NO and first-order dependent on [KMnO 4 ]. The addition of NaOH into the solutions of KMnO 4 would 801 increase the absorption rate of NO. The absorption rate of NO at 25°C is lower than that of 50°C. In the ranges of this study, the absorption rate of NO would not change by changing the gas flow rate and O 2 concentration. NO 2 -is the dominate ion in the liquid phase for this study. However, the [NO 3 -]/[NO 2 -] ratio increases with the increasing NaOH concentration.
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