Reaction Kinetics of Simultaneous Removal of SO2 and NO from Flue Gas by NaClO2 Solution

Experiments of simultaneous removal of SO2 and NO from simulated flue gas, using NaClO2 solution as the absorbent, were carried out in a self-designed bubble reactor, and removal efficiencies of 100 percent for SO2 and 95.2 percent for NO were obtained under the optimal experimental conditions. The mechanism of simultaneous removal of SO2 and NO using NaClO2 acid solutions was proposed by analyzing the removal products. The reaction kinetics for simultaneous desulfurization and denitrification were investigated, and the results indicated that the oxidation-absorption processes of SO2 and NO were divided into two zones, as the fast and slow reaction zones. In the slow reaction zones, both were zero order reactions, and in the fast reaction zones, the reaction order, rate constant and activation energy of SO2 removal reaction with absorbent were 1.4, 1.22 (mol L-1)(-0.4) s(-1) and 66.25 kJ mol(-1), respectively, and 2, 3.15 x 10(3) (mol L-1)(-1) s(-1), and 42.50 kJ mol(-1) for NO removal reaction, respectively.