화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.10, No.6, 972-981, November, 2004
Characterization of Nanometer-sized Al/TiO2 Photocatalysts and the Decomposition of Benzene in Plasma- and Photo-types Systems
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This study focuses on the relationship between the photocatalytic activity of benzene and the surface properties of nano-sized Al/TiO2. The results indicate that the Al/TiO2 particles, which are below 150 nm in size, exhibited a uniformly spherical anatase structure. In terms of surface properties, the 10.0-wt% Al/TiO2 formed a larger (29.9 m2/g) area compared with that formed by pure TiO2 (50 m2/g). The XRD pattern for Al/TiO2 developed a stable anatase structure after thermal treatment at 800℃. On the other hand, pure TiO2 was rapidly transformed into the rutile type after thermal treatment above 600℃. In addition, the XPS and TG results show that Al/TiO2 possessed a higher hydrophilic property than did pure TiO2. The TPR results also reveal that the Ti3+ or Ti4+ in Al/TiO2 could be more easily reduced to Ti0 (which influenced the photoreaction), compared with pure TiO2. The photodecomposition of benzene was enhanced in Al/TiO2 compared to pure TiO2, especially with H2O addition. The catalytic activities of TiO2 and 10.0-wt% Al/TiO2 were almost the same in the plasma system. The conversion to CO2, however, was slightly enhanced in the case of 10.0-wt% Al/TiO2. Nonetheless, upon H2O addition, the conversion to CO2 using both catalysts increased remarkably. This outcome may be attributed to the presence of the OOH radical in both catalysts, which induced the complete oxidation reaction of benzene in TiO2 and 10.0-wt% Al/TiO2. The OOH radical was generated by the reaction of H2O and O3 to the stronger light source and plasma level in the system.
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