Simultaneous Reduction of NO/SO2 Gas Using Fe(II)EDTA Solution at Low Temperature Conditions and Analysis of Solution Regeneration Characteristics by Zn

Abstract

In a combustion process using fossil fuels, harmful substances such as sulfur oxide(SOx) and nitrogen oxide(NOx) are emitted in a gas form. Among the harmful substances, about 95% of nitrogen oxides(NOx) exist in the NO form, and most of sulfur oxides(SOx) are composed of sulfur dioxide and sulfur trioxide. Sulfur oxide(SOx) in gas is reduced in various ways due to its high solubility, but nitrogen oxide(NOx) has low solubility and thus requires a separate treatment method. In this study, the simultaneous reduction characteristics of nitrogen oxide(NOx) and sulfur oxide(SOx) in exhaust gas were analyzed using Fe(II)EDTA solution to simultaneously reduce NO/SO2 gas under low temperature conditions, and regenerative characteristics of the solution were analyzed using zinc(Zn) as a catalyst. In the simultaneous reduction experiment, the initial adsorption process according to the change in pH was analyzed, and the performance was analyzed in consideration of the NO adsorption amount. The regeneration experiment of the solution analyzed the adsorption performance according to the change in the molar concentration of zinc(Zn). It was sought to derive the optimal operating conditions for reducing sulfur oxide(SOx) and nitrogen oxide(NOx) simultaneously by analyzing the change in the molar concentration of pH and zinc(Zn) under low temperature conditions.