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        Photocatalytic Decomposition of Gaseous Ozone over TiO₂Thin Fiil

        Cho, Ki-Chul,Hwang, Kyung-Chul,Yeo, Hyun-Gu,Sano, Talzo,Takeuchl, Koji,Matsuzawa, Sadao 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.E3

        The characteristics of heterogeneous photocatalytic decomposition were investigated at low concentration level of 0₃ on Ti0₂ for various operating parameters such as: loaded catalyst weight (0-4 mg/cm²), initial concentration of 0, (0.06-10.0ppm), gas flow rate(1.0-2.5I1min), and relative humidity (0-80%). This study was conducted using a flow-type reactor at room temperature. Three kinds of pure Ti02 (P25, ST-Ol, and E-23) were employed as photocatalyts. It was found that 0₃ removal ratio was identical, regardless of the loaded Ti0₂ weight in the range from 0.5 to 4.0 mg/cm². It was also found that higher initial ozone concentration results in greater oxidation rate of ozone and experimental data show kinetically a good agreement with Langmur-Hinshelwood kinetic model. We also observed that the removal ratio of 0₃ decreases linearly with the increasing flow rate and also with the increasing relative humidity for each catalyst.

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