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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Photo-catalytic oxidation of acetone on a TiO2 powder: An in situ FTIR investigation

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Title
Photo-catalytic oxidation of acetone on a TiO2 powder: An in situ FTIR investigation
Author
Szanyi, JanosKwak, Jahun
Issue Date
2015-09
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, v.406, pp.213 - 223
Abstract
In situ transmission infrared spectroscopy was used to investigate the photo-oxidation of acetone on a commercial, oxidized TiO2 (P25) powder catalyst under UV irradiation at ambient temperature, in the absence and presence of gas phase O-2. The photochemistry of a number of organic molecules (2-butanone, methanol and acetic acid,) under the same conditions was also studied in order to identify reaction intermediates and products formed in the photo-oxidation of acetone. Under anaerobic conditions (in the absence of gas phase oxygen) limited extent of photo-oxidation of acetone took place on the oxidized TiO2 sample. In the presence of O-2 in the gas phase, however, acetone was completely converted to acetates and formates, and ultimately CO2. The initial step in the sequence of photo-induced reactions is the ejection of a methyl radical, resulting in the formation of surface acetates (from the acetyl group) and formates (from the methyl radicals). Acetate ions are also converted to formates, that, in turn, photo-oxidized to CO2. Under the experimental conditions applied the accumulation of carbonates and bicarbonates were observed on the TiO2 surface as the photo-oxidation of acetone proceeded (this was also observed during the course of photo-oxidation of all the other organics studied here). When the initial radical ejection step produced hydrocarbons containing more than one C atoms (as in the case in 2-butanone and mesytil oxide), the formation of aldehydes on the catalyst surface was also observed as a result of secondary reactions. (C) 2015 Elsevier B.V. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/13383
URL
http://www.sciencedirect.com/science/article/pii/S1381116915002095
DOI
10.1016/j.molcata.2015.05.025
ISSN
1381-1169
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