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KMID : 1171820050200040045
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Journal of Environmental and Sanitary Engineering
2005 Volume.20 No. 4 p.45 ~ p.50
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Performance Test of TiO₂ Catalyst in VOCs Photocatalytic Degradation
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Lee Seung-Bum
Lee Jae-Dong
Park Yoon-Shin
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Abstract
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Titania gel formations were prepared by sol-gel method using titanium(Ⅳ) chloride (TiCl₄), and its characteristics were analyzed by varying the epoxide/TiCl₄ ratio and the amount of water. In the end, titania (TiO₂) aerogel were prepared using supercritical drying process. VOCs such as benzene, toluene, and m-xylene (BTX) were oxidized using prepared titania aerogel and commercially available TiO₂, and its performance was compared. The surface area, pore volume, and average pore diameter of 1,2-epoxybutane are significantly smaller than the propylene oxide. And the titania aerogels with 6 mol of epoxides have high surface areas, pore volumes, and average pore diameters. As a result of photo-oxidation, conversion of benzene was reached about 70%, and other reactants were reached about 60% similarly. The conversion of BTX was increased as inlet concentration decreased. The reactivity of titania calcined at 600℃ was greater than 400 ℃ and 800 ℃. Water is required as a reactants for the oxidation of VOCs, and the continuous consumption of hydroxyl radicals required replenishments to maintain catalyst activity. The activity ratio increased with increasing reaction time when enough amount of water was present in the reactor.
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KEYWORD
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Titania, Volatile Organic Compounds, Photocatalysis, BTX
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