Catalytic decomposition of ozone on nanostructured potassium and proton containing δ-MnO2 catalysts

Abstract

The nanostructured proton-containing δ-MnO2 (H-δ-MnO2) catalyst was prepared by proton exchange of K-containing δ-MnO2 (K-δ-MnO2) nanoflakes. Energy-dispersive spectroscopy analysis showed that the K+ cations effectively leached away and replaced with H+ ions. Exchange of K+ ions with H+ ions in K-δ-MnO2 catalyst facilitated high surface area, high reducibility and better diffusion of ozone into the channels of 2D structure. It also reduced the average oxidation state of Mn (3.90 to 3.59) and increased the surface oxygen vacancies (0.62 to 0.87) from K-δ-MnO2 to H-δ-MnO2 catalyst. These all parameters are efficiently increased the decomposition of ozone from K-δ-MnO2 to H-δ-MnO2 catalyst.