Opposite effect of gas phase H 2O 2 on photocatalytic oxidation of acetone and benzene vapors

The effect of additions of gas phase H 2O 2 was measured for gas phase photocatalytic oxidation of organic vapors. Photocatalytic oxidation of benzene vapor over TiO 2 in a flow reactor resulted in a quick catalyst deactivation. Additions of gas phase H 2O 2 into the reactor feed provided enhanced a...

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Bibliographic Details
Published inCatalysis communications Vol. 8; no. 12; pp. 2100 - 2104
Main Author Vorontsov, A.V.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2007
Subjects
Aromatic compounds
Deactivation
Hydrogen peroxide
Photocatalysis
Reactivation
Rutile
Surface peroxocomplex
Titanium dioxide
Surface peroxocomplex
Reactivation
Hydrogen peroxide
Deactivation
Rutile
Aromatic compounds
Photocatalysis
Titanium dioxide
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Summary:The effect of additions of gas phase H 2O 2 was measured for gas phase photocatalytic oxidation of organic vapors. Photocatalytic oxidation of benzene vapor over TiO 2 in a flow reactor resulted in a quick catalyst deactivation. Additions of gas phase H 2O 2 into the reactor feed provided enhanced and sustained oxidation of benzene vapor. The increase of inlet H 2O 2 vapor concentration from 0 to about 1000 ppm led to the one order of magnitude growth of benzene vapor complete oxidation rate. The highest rate of 1.1 nmol/s was observed at C 6H 6 concentration 124 ppm and H 2O 2 concentration 1000 ppm. In the case of acetone vapor photocatalytic oxidation, the rate of complete oxidation in the flow reactor decreased with an increase of gas phase H 2O 2 inlet concentration. TiO 2 Degussa P25 provided higher oxidation rate in the presence of H 2O 2 than pure anatase TiO 2.
ISSN:1566-7367
1873-3905
DOI:10.1016/j.catcom.2007.04.027