Reaction Kinetics, Mechanisms and Catalysis
Volume/Issue:
Volume 102: Issue 2
Comparison of the liquid and gas phase photocatalytic activity of flame-synthesized TiO2 catalysts: the role of surface quality
Authors:
Nándor Balázs Research Group of Environmental Chemistry, University of Szeged, Dóm tér 7, Szeged 6720, Hungary

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Attila Gácsi Research Group of Environmental Chemistry, University of Szeged, Dóm tér 7, Szeged 6720, Hungary

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Attila Pallagi Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, Szeged 6701, Hungary

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Károly Mogyorósi Research Group of Environmental Chemistry, University of Szeged, Dóm tér 7, Szeged 6720, Hungary

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Tünde Alapi Research Group of Environmental Chemistry, University of Szeged, Dóm tér 7, Szeged 6720, Hungary

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Pál Sipos Department of Inorganic and Analytical Chemistry, University of Szeged, P.O. Box 440, Szeged 6701, Hungary

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András Dombi Institute of Material Science and Engineering, University of Szeged, P.O. Box 428, Szeged 6701, Hungary

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Pages:
283–294
Online Publication Date:
05 Jan 2011
Publication Date:
01 Apr 2011
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s11144-010-0271-2
Keywords:
TiO2; Heterogeneous photocatalysis; Gas phase–liquid phase photocatalytic activity; Surface quality
Restricted access

Abstract

A set of flame-hydrolytic TiO2 samples was synthesized. Via systematically increasing the precursor (TiCl4) feeding rate to the flame, nanocrystalline TiO2 specimens with practically identical bulk structural properties (that is: particle size, anatase-to-rutile ratio, specific surface area) were obtained. However, it has been observed that with increasing precursor feed rate, the fraction of the polyhedral particles increased in the products at the expense of the spherical ones. In our previous work, we argued, that faceted particles are superior to spherical ones in phenol decomposition. In this work, the photocatalytic activities of these samples were determined in the gas phase using methanol and acetaldehyde as model compounds and they were compared with those obtained for an aqueous solution containing phenol. The photocatalytic activities were found to vary in parallel in the case of phenol and methanol: they increased with the precursor feed rate (and also with the frequency of the faceted nanocrystals) for both. However, for acetaldehyde, the photocatalytic activity did not change systematically within this series of experiments, and roughly remained constant. Our results indicate that the surface quality of TiO2 is of primary importance in the selectivity of photocatalytic reactions.

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Cover Reaction Kinetics, Mechanisms and Catalysis
Reaction Kinetics, Mechanisms and Catalysis
Print ISSN:
1878-5190
Online ISSN:
1878-5204

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Reaction Kinetics, Mechanisms and Catalysis
Language English
Size B5
Year of
Foundation		 1974
Volumes
per Year		 1
Issues
per Year		 6
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1878-5190 (Print)
ISSN 1878-5204 (Online)

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