Contributions of photocatalytic/catalytic activities of TiO₂ and γ-Al₂O₃ in nonthermal plasma on oxidation of acetaldehyde and CO

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• 作者：Taizo Sano ; Nobuaki Negishi ; Emiko Sakai and Sadao Matsuzawa
• 关键词：Plasma ; Photocatalyst ; TiO₂ ; Acetaldehyde ; CO ; Ozone ; Surface discharge
• 刊名：Journal of Molecular Catalysis A ; Chemical
• 出版年：2006
• 期刊代码：57_13811169
• 类别：ch
• 出版时间：15 February 2006
• 卷：245
• 期：1-2
• 页码：235-241
• 文件大小：384 K

摘要

The effects of photocatalysis and thermocatalysis in surface discharge type plasma reactors combined with TiO₂- and Al₂O₃-based catalysts were analyzed. The photocatalytic decomposition of acetaldehyde was not observed although the TiO₂ absorbed the UV light (300 < λ < 380 nm) emitted from N₂ plasma. The intensity of UV emission from plasma decreased with increasing O₂ concentration. In atmospheric air, the photocatalytic decomposition rate by UV light of plasma is lower than 0.2%of the decomposition rate by the plasma itself. The coating of γ-Al₂O₃ on the inside wall of plasma reactor improved the oxidation rate for CO by a factor of 3.5, while TiO₂ improved by only a factor of 1.8, compared with the bare plasma reactor. The high activity of Al₂O₃ seems to be due to the active oxygen species produced by the O₃ decomposition.