Reaction Performance Study on Denitration in Aqueous Solution of the Dual Oxidant (H_2O_2/S_2O_8~(2-))

摘要

The reaction performance study on NO removal by using the dual oxidant (H_2O_2/S_2O_8~(2-)) solution was carried out in self-designed bubbling reactor. The experimental results showed that NO removal efficiency was up to 92.9% at pH 11. The results of the thermodynamics calculation verified that NO removal by using strong alkaline dual oxidant (H_2O_2/S_2O_8~(2-)) solution was feasible. The results of the kinetic study showed that the reaction between NO and dual oxidant (H_2O_2/S_2O_8~(2-)) in strong alkaline condition was found to be 1.5-order with respect to NO, and the average activation energy of this reaction was 26.32 kj mol~(-1) in the quick-reaction zone. The ion chromatogruphy (IC) analysis results in strong alkaline condition showed that NO_3~- and SO_4~(2-) were the final ionic product in spent reaction solution. This dual oxidant (H_2O_2/S_2O_8~(2-)) was a promising oxidant for the simultaneous wet removal of NO and SO_2 with high efficiency, no secondary pollution and low cost.