Preparation of Fe-modified photocatalysts and their application for generation of useful hydrocarbons during photocatalytic decomposition of acetic acid

The present study was focused on the photocatalytic generation of useful hydrocarbons and hydrogen from acetic acid under N 2 atmosphere. The photocatalysts applied in the study were prepared from a crude TiO 2 modified with Fe(CH 3COO) 2 and calcinated at the temperatures of 400, 500 or 600 °C in a...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2010-12, Vol.216 (2), p.275-282
Main Authors: Mozia, Sylwia, Heciak, Aleksandra, Morawski, Antoni W.
Format: Article
Language:English
Subjects:
Acetic acid
Fe/TiO 2
Hydrocarbons
Methane
Photocatalysis
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Summary:The present study was focused on the photocatalytic generation of useful hydrocarbons and hydrogen from acetic acid under N 2 atmosphere. The photocatalysts applied in the study were prepared from a crude TiO 2 modified with Fe(CH 3COO) 2 and calcinated at the temperatures of 400, 500 or 600 °C in argon atmosphere. In order to compare the results, the commercially available photocatalyst AEROXIDE ® P25 (Evonik, former Degussa, Germany) was also used in the experiments. The photocatalysts were characterized by UV–vis/DR and FTIR spectroscopy, N 2 adsorption–desorption at 77 K and XRD measurements. The crystallite size of anatase was in the range of 7–28 nm and the anatase over rutile ratio was from 82:18 to 95:5. The main gaseous products of CH 3COOH decomposition were CH 4 and CO 2. Moreover, ethane, propane and hydrogen were detected in the gaseous reaction mixtures. The most active photocatalyst towards CH 4 generation was TiO 2 containing 20 wt.% of Fe calcinated at 500 °C. After 27 h of the process conducted with this catalyst the amount of CH 4, CO 2, C 2H 6, C 3H 8 and H 2 evolved was 3.36, 2.97, 0.13, 0.01 and 0.14 mmol/mol CH 3COOH, respectively. It was concluded that photocatalytic decomposition of organic compounds, such as acetic acid, under N 2 atmosphere could be regarded as a method of production of environmentally friendly “photo-biogas”; however, since the yield of hydrocarbons formation was very low, deep and extensive investigations are still necessary in order to improve the efficiency of the process.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2010.09.016