Effect of Calcination Temperature of Mnxoy/Γ-Al2O3catalyst on Ozone Decomposition
This study investigated the oxidation state, MnO2 phase and ozone decomposition performance of manganese
oxide catalysts prepared by changing the calcination temperature in the range of 300-900oC.The manganese oxide was
supported on ceramic foam, and instrumental techniques such as X-ray diffraction, scanning electron microscopy and surface
area analysis were used to characterize the prepared catalysts. The experimental results showed that the chemical nature of
MnxOy changed from γ-MnO2 to β-MnO2phasewith increasing the calcinations temperature. The ozone decomposition
efficiency was the highest when the catalyst was calcined at 500oC, and the optimum space velocity was found to be about
17500 hr-1.At this temperature of 500oC, β-MnO2coexisted with Mn2O3.
Indexterms- Manganese oxide,Crystal structure, Ozone, XRD.