Catalytic Oxidation of NO on MnO2 in the presence of Ozone

Abstract

In this study, the fundamental experiments were performed for catalytic oxidation of NO (50 ppm) on MnO2 in the presence of ozone. The experiments were carried out at various catalytic temperatures (30-120℃) and ozone concentrations (50-150 ppm) to investigate the behavior of NO oxidation. The honeycomb type MnO2 catalyst was rectangular with a cell density of 300 cells per square inch. Due to O3 injection, NO reacted with O3 to form NO2, which was adsorbed at the MnO2 surface. The excessive ozone was decomposed to O3 onto the MnO2 catalyst bed, and then that O3 was reacted with NO2 to form NO­-3. It was found that the optimal O3/NO ratio for catalytic oxidation of NO on MnO2 was 2.0, and the NO removal efficiency on was MnO2 83% at 30℃. As a result, NO was converted mainly to NO­-3.