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Open AccessArticle

Photocatalytic Oxidation of Diethyl Sulfide Vapor over TiO2-Based Composite Photocatalysts

by Dmitry Selishchev 1,2,3,* and Denis Kozlov 1,2,3
1
Boreskov Institute of Catalysis, pr. Ak. Lavrentieva 5, Novosibirsk 630090, Russia
2
Novosibirsk State University, st. Pirogova 2, Novosibirsk 630090, Russia
3
Research and Educational Centre for Energoefficient Catalysis (NSU), st. Pirogova 2, Novosibirsk 630090, Russia
*
Author to whom correspondence should be addressed.
Molecules 2014, 19(12), 21424-21441; https://doi.org/10.3390/molecules191221424
Received: 31 August 2014 / Revised: 4 December 2014 / Accepted: 12 December 2014 / Published: 19 December 2014
(This article belongs to the Special Issue Photocatalysis)
Composite TiO2/activated carbon (TiO2/AC) and TiO2/SiO2 photocatalysts with TiO2 contents in the 10 to 80 wt. % range were synthesized by the TiOSO4 thermal hydrolysis method and characterized by AES, BET, X-ray diffraction and FT-IR ATR methods. All TiO2 samples were in the anatase form, with a primary crystallite size of about 11 nm. The photocatalytic activities of the TiO2/AC and TiO2/SiO2 samples were tested in the gas-phase photocatalytic oxidation (PCO) reaction of diethyl sulfide (DES) vapor in a static reactor by the FT-IR in situ method. Acetaldehyde, formic acid, ethylene and SO2 were registered as the intermediate products which finally were completely oxidized to the final oxidation products – H2O, CO2, CO and SO42 ions. The influence of the support on the kinetics of DES PCO and on the TiO2/AC and TiO2/SiO2 samples’ stability during three long-term DES PCO cycles was investigated. The highest PCO rate was observed for TiO2/SiO2 photocatalysts. To evaluate the activity of photocatalysts the turnover frequency values (TOF) were calculated for three photocatalysts (TiO2, TiO2/AC and TiO2/SiO2) for the same amount of mineralized DES. It was demonstrated that the TOF value for composite TiO2/SiO2 photocatalysts was 3.5 times higher than for pure TiO2. View Full-Text
Keywords: photocatalysis; TiO2; activated carbon; silica; composite photocatalyst; diethyl sulfide photocatalysis; TiO2; activated carbon; silica; composite photocatalyst; diethyl sulfide
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MDPI and ACS Style

Selishchev, D.; Kozlov, D. Photocatalytic Oxidation of Diethyl Sulfide Vapor over TiO2-Based Composite Photocatalysts. Molecules 2014, 19, 21424-21441.

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