Photocatalytic Activity of Mesoporous Titanium Dioxide Stabilized with Lanthanum in the Gas-Phase Oxidation of Ethanol
Samples of mesoporous anatase (TiO2) with crystallites of not more than 10 nm in size stabilized with lanthanum(III) ions, which are 3-4 times more photochemically active than the commercial TiO2 product Evonik P25 in the total gas-phase oxidation of ethanol, were obtained by the sol–gel method. It was established that hydrothermal treatment and addition of lanthanum increase the photocatalytic activity. This may be due to decrease in the size of the crystallites that form its secondary mesoporous structure and also to increase in the size of the pores, which favors adsorption of the substrate molecules and desorption of the reaction products into the gas phase.
Key wordsmesoporous TiO2 anatase lanthanum gas-phase oxidation of ethanol
- 8.W. Zhang, Chem. Commun., No. 11, 1185-1186 (1998).Google Scholar
- 12.N. I. Ermokhina, V. I. Litvin, V. G. Il’in, and P. A. Manorik, Ukr. Khim. Zh., 73, Nos. 1/2, 21-25 (2007).Google Scholar
- 15.A. L. Stroyuk, N. I. Ermokhina, A. V. Korzhak, et al., Teor. Éksp. Khim., 51, No. 3, 176-184 (2015). [Theor. Exp. Chem., 51, No. 3, 183-190 (2015) (English translation).]Google Scholar
- 16.G. Hu, D. Ma, M. Cheng, et al., Chem. Commun., No. 17, 1948-1949 (2002).Google Scholar
- 17.O. L. Stroyuk, O. Ye. Rayevska, V. V. Shvalagin, et al., Photochem. Photobiol. Sci., 12, No. 4, 621-625 (2013).Google Scholar