Abstract
Abstract The effect of additions of gas phase H 2 O 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 2 O 2 into the reactor feed provided enhanced and sustained oxidation of benzene vapor. The increase of inlet H 2 O 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 6 H 6 concentration 124 ppm and H 2 O 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 2 O 2 inlet concentration. TiO 2 Degussa P25 provided higher oxidation rate in the presence of H 2 O 2 than pure anatase TiO 2 .
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