Abstract: V-doped titanium mixed oxide catalysts with TiO2 as the main component were prepared by the acid catalysis sol-gel method and was applied for ethylbenzene oxidative dehydrogenation in the presence of carbon dioxide at 450 ℃. The catalysts were characterized by X-ray diffraction, N2 physical adsorption, X-ray photoelectron spectroscopy, and thermogravimetric analysis-mass spectroscopy. The catalyst had good catalytic performance for the ethylbenzene oxidative dehydrogenation with carbon dioxide. The deactivation of catalyst was mainly due to the coke deposition, and the deactivated catalyst could be easily regenerated on-site by diluted air. The catalytic activity of the regenerated catalyst was very close to that of the fresh one.

Key words: titanium dioxide, vanadium catalyst, ethylbenzene, carbon dioxide, oxidative dehydrogenation, styrene