Study on alumina-supported vanadia catalysts for ethylbenzene dehydrogenation in mixed reaction atmosphere
ZHANG Xue-bin, XING Chun-sheng, YANG Rong-zhen, DONG Wen-sheng*
(Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education; College of Chemistry and Materials Science, Shaanxi Normal University, Xi′an 710062, Shaanxi, China)
Abstract:
V2O5/γ-Al2O3 catalysts with different V loading were prepared by impregnation method. The catalysts were characterized using temperature-programmed reduction (TPR), X-ray photoelectron energy spectrum (XPS), X-ray diffraction (XRD), N2 physical adsorption, and tested in the dehydrogenation of ethylbenzene. The results show that with increasing V loading the initial activity of V2O5/γ-Al2O3 catalysts in the dehydrogenation of ethylbenzene with CO2 increases; whereas, the stability of these catalysts decreases. The addition of O2 to the process improves the stability of the V2O5/γ-Al2O3 catalysts due to suppressing the coke deposition and keeping the vanadium species at high valence.
KeyWords:
Ethylbenzene; dehydrogenation; styrene; vanadium oxide
