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Two photoactive TiO 2 -supported materials are considered for toluene degradation in the gas phase. A kinetic study is performed over these two catalysts. The mechanisms involved are well represented by the Langmuir-Hinshelwood (L-H) relation at initial time. The kinetic rates and adsorption constants are then calculated to compare the catalysts. Particular attention focuses on the role of the humidity on the photocatalytic activity. Conversion rates of the toluene into carbon dioxide are measured and reveal a singular difference between the catalysts. Benzaldehyde and benzoïc acid are identified as major by-products in the gas phase. The production of stable intermediates is also shown. It is concluded that not only the presence of water vapor but also the characteristics of the titanium materials have to be taken into account to explain the kinetic behavior of photocatalytic oxidation.

TiO 2 -Based Materials for Toluene Photocalytic Oxidation: Water Vapor Influence