期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
卷 183, 期 1-2, 页码 35-40出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2006.02.019
关键词
photocatalysis; aldehyde; byproduct identification; titania; reaction pathway; mechanism
The byproducts and reaction pathway of gas phase photocatalytic oxidation (PCO) of butyraldehyde, propionaldehyde and acetaldehyde over aerogel TiO2 under weak black light were studied by means of liquid nitrogen trapping, water extraction, mass spectrometry and carbon balance. Aldehydes were photocatalytically oxidized to corresponding acids, shorter carbon-chain aldehydes, carbon dioxide and water. The so-generated acids were further oxidized to shorter carbon-chain aldehydes, carbon dioxide, and water. Other side reactions were suppressed. The reaction pathway we found can be explained in a straightforward manner with active O-* as well as hydroxyl group as the major oxidants. (c) 2006 Elsevier B.V. All rights reserved.
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