Promoting Effect of H+ and Other Factors on NO Removal by Using Acidic NaClO2 Solution

In this study, NaClO2was selected as a denitration oxidant. In order to clarify the mechanism of NaClO2as an oxidation agent for NO removal efficiency, the effects of H+and other factors (NaClO2concentration, temperature, and the other gas) on the NO removal efficiency were investigated. NaClO2showed a promotional ability on NO removal, whose efficiency increased with the increase of NaClO2concentration. One hundred percent removal efficiency of NO could be achieved when the NaClO2concentration was 0.014 mol/L. Furthermore, raising the reaction temperature benefited the removal of NO. The lower the pH, the better the NO removal efficiency. The promoting effect of H+on the NO removal was studied by the Nernst equation, ionic polarization, and the generation of ClO2. Under the optimal conditions, the best removal efficiency of NO was 100%. Based on the experimental results, the reaction mechanism was finally speculated.Keywords:sodium chlorite (NaClO2);wet scrubbing;removal efficiency;NO reaction mechanism