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Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts
Department of Energy and Material Sciences, Faculty of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan
* Author to whom correspondence should be addressed.
Received: 23 November 2012; in revised form: 5 January 2013 / Accepted: 5 February 2013 / Published: 4 March 2013
Abstract: Gas-solid heterogeneous photooxidation of toluene over TiO2 catalyst was studied to investigate the factors controlling the catalytic activities. The toluene photooxidation behavior on TiO2 was strongly affected by the formation and oxidation behavior of intermediate compounds on TiO2, and their accumulation decreased the reaction rate for toluene photooxidation. The formation and oxidation behavior of the byproduct compounds depended on the initial concentration of toluene and water vapor. In situ Fourier transform infrared (FTIR) studies revealed that water vapor promoted the cleavage of the aromatic ring and facilitated CO2 formation. At the reaction temperature of 300 K, the deposition of Pt on TiO2 suppressed CO formation, whereas catalytic activity was decreased due to the increase in the amount of intermediate compounds. On the other hand, Pt/TiO2 showed higher activity than TiO2 at 353 K, in spite of the increase of the intermediate compounds.
Keywords: titanium dioxide; photocatalytic reaction; oxidation; toluene
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MDPI and ACS Style
Einaga, H.; Mochiduki, K.; Teraoka, Y. Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts. Catalysts 2013, 3, 219-231.
Einaga H, Mochiduki K, Teraoka Y. Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts. Catalysts. 2013; 3(1):219-231.
Einaga, Hisahiro; Mochiduki, Keisuke; Teraoka, Yasutake. 2013. "Photocatalytic Oxidation Processes for Toluene Oxidation over TiO2 Catalysts." Catalysts 3, no. 1: 219-231.