Catalytic Conversion of Toluene on MnO2/TiO2 Catalysts in the Presence of Ozone

Catalytic Conversion of Toluene on MnO2/TiO2 Catalysts in the Presence of Ozone
Nanoparticles,; Toluene; Crystallinity; Thermal decomposition process
Issue Date
International Conference on Thermal Treatment Technologies & Hazardous Waste Combustors
The catalytic conversion of toluene on MnOx/TiO2 catalysts was examined in the presence of ozone. The MnOx/TiO2 catalysts were prepared by a wet-impregnation method. A set amount of manganese acetate was dissolved in distilled water. The TiO2 nanoparticles, as the support materials in this study, were synthesized by a thermal decomposition process. The generation of TiO2 nanoparticles by the thermal decomposition of titanium tetraisopropoxide (TTIP) was carried out in an electric tune furnace. The TiO2 nanoparticles were characterized by X-ray diffraction, Brunauer-Emmett-Teller measurements and transmission electron microscopy. Compared to the commercial photocatalyst (P25), the TiO2 nanoparticles prepared at 900˚C had a small particle size (10.5 nm), pure anatase phase and a high degree of crystallinity with a dense polyhedral structure. The concentration of toluene was varied in the range of 20-100 ppm and the ozone to toluene ratio was increased from 1.0 to 15.0. The reaction temperature was controlled between 25-100˚C and the space velocity was fixed at 20000 h-1. The COx selectivity was enhanced considerably by the catalyst supported on TiO2 (thermal decomposition process) after injecting ozone. The activity of the catalyst depended mainly on the support used. The catalyst synthesized by the thermal decomposition process was found to be the most active support.
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