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Received August 29, 2006
Accepted October 11, 2006
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Large-scale production of titania nano-coated silica-gel beads by fluidized bed chemical vapor deposition
Korea Institute of Energy Research, Daejeon 305-343, Korea 1Korea University of Technology and Education, Cheonan, Chungnam 330-860, Korea 2Sanetech Co. Ltd., Gunsan, Jeonbuk 573-718, Korea
jhpark@kier.re.kr
Korean Journal of Chemical Engineering, March 2007, 24(2), 347-349(3), 10.1007/s11814-007-5062-8
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Abstract
A new technique of thermal fluidized-bed metal-organic chemical vapor deposition (FB-MOCVD) was developed to prepare titania nano-coated silica-gel beads on a large scale (20 kg/batch) at different deposition temperatures of 450, 500, 550, and 600 ℃. Titanium tetra iso-propoxide (TTIP, Ti[OCH(CH3)2]4, Aldrich Chemical Co.) was used as a precursor of titania. The titania nano-coated silica-gel beads prepared by FB-MOCVD apparatus were hardly breakable compared to other common coating techniques in liquid phase such as sol-gel and dipping method. It was found that, from the FE-SEM/EDXS analysis and XPS results, the surfaces of silica-gel beads were covered with particle forms of titania. The photocatalytic degradation of acetaldehyde into CO2 and H2O was not much affected by deposition temperature.
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