Photocatalysis in microreactors

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• 作者：Gorges ; Roger ; Meyer ; Susann ; Kreisel ; Gü ; nter
• 关键词：Microreactor ; Photocatalytic ; TiO₂ ; Kinetics ; Mass transfer ; UV-A LED
• 刊名：Journal of Photochemistry and Photobiology A ; Chemistry
• 出版年：2004
• 期刊代码：66_10106030
• 类别：ch
• 出版时间：October 1, 2004
• 卷：167
• 期：2-3
• 页码：95-99
• 文件大小：166 K

摘要

A photocatalytic microreactor with immobilized titanium dioxide as photocatalyst and illuminated by UV-A light emitting diodes was constructed and tested for the degradation of the model substance 4-chlorophenol. The microreactor consisted of 19 channels with a cross-section of approximately 200μm×300μm. Intrinsic kinetic parameters of the reaction could be determined and mass-transfer limitations for the employed operating conditions could be excluded by calculating appropriate Damköhler numbers. Photonic efficiencies for the degradation of 4-chlorophenol are provided. The illuminated specific surface of the microstructured reactor surpasses that of conventional photocatalytic reactors by a factor of 4–400.