Effect of Fe on Structure and Activity of V-Doped Titanium Mixed Oxides Catalyst

• 1、1a.State Key Laboratory Training Base of Coal Science and Technology, lb.Key Laboratory of Coal Scicence and Technology, Ministry of Education and Shanxi Province, Taiyuan University of Technology

Abstract：V-doped titanuium mixed oxide catalyst denoted as V6T was prepared by acid-catalyzed sol-gel method, adding Fe as the second active component and formed Fex/V6T catalyst. The catalysts were applied in the dehydrogenation of ethylbenzene in the presence of carbon dioxide at 450 ℃. Compared with the V6T catalyst, the Fe2/V6T catalyst has better catalytic activity, which ethylbenzene conversion and styrene selectivity are 20.0% and 98.2%. X-ray diffraction, N2 adsorption, H2 temperature-programmed reduction and X-ray photoelectron spectroscopy were employed to investigate the structure of catalysts further. The addition of Fe could change the crystal structure, pore distribution and reduction property of V6T catalyst and the activity of dehydrogenation of ethylbenzene in the presence of carbon dioxide increased accordingly. When the Fe are added the direct catalytic dehydrogenation is enhanced more than the oxidative dehydrogenation and the reaction coupling process is not accelerated. The main causes for deactivation of the Fe2/V6T catalyst are the carbon deposit and the reduction of active species to inactive species.

Keywords： catalyst Engineering ethylbenzene oxidative dehydrogenation Fe V-doped titanium mixed oxides catalyst carbon dioxide