Basic rules of NO oxidation by Fe²⁺/H₂O₂/AA directional decomposition system

Abstract

Basic rules of NO oxidation by a Fe 2þ /H 2 O 2 /AA directional decomposition system were researched based on the technical background of flue gas NO x removal. Effects of gas-liquid interfacial area, main gas, and solution parameters on NO oxidation efficiency (h) were analyzed. The results showed that adequate contact area was the precondition for high h by a Fe 2þ /H 2 O 2 /AA system. h decreased with the increase in NO concentration, which illustrated that this method would be efficient in oxidizing NO at a low concentration. h tended to decrease linearly with the growth in gas flow, however, the NO oxidation rate (v) rose with the increase in NO concentration and gas flow. h increased with the initial concentrations of H 2 O 2 and Fe 2þ , but the amplitude decreased. Controlling the initial concentrations of H 2 O 2 and Fe 2þ to achieve reasonable synergies between generation rate and consumption rate of ÁOH could weaken the invalid consumption of reactants. h increased with the increase in temperature in the range 30-60 8C, but it nearly did not change with temperature after 60 8C. This oxidation technology and the traditional wet flue gas desulphurization technology exhibited temperature synergy. Under typical pH of wet desulphurization, h and H 2 O 2 consumption rate did not change obviously.