Vapor-phase dehydrogenation of ethylbenzene to styrene over V2O5/TiO2-Al2O3 catalyst with CO2
The activity of V2O5/TiO2-Al2O3 catalyst for oxidative dehydrogenation of ethylbenzene to styrene with various V2O5 loadings in the presence of CO2 and N2 was studied. Among the different loadings of V2O5, 5 wt.% V2O5/TiO2-Al2O3 catalyst exhibited better activity. The incorporation of TiO2 into the Al2O3 support greatly influenced the activity of the catalyst. The maximum conversion of ethylbenzene and styrene selectivity was observed to be 65% and 96%, respectively at 550 °C and notable stablility up to 60 hours with CO2. . The conversion directly depends on the availability of the active V5+ sites. The facile redox cycle between fully oxidized and reduced V species was effective for the reaction. The catalysts were characterized by X-Ray diffraction, Raman spectroscopy, BET surface area and pore size distribution, Scanning electron microscopy, and H2-temperature programmed reduction.The results indicate that the surface area, interaction with the support, morphology of the catalyst and surface active sites exerted a significant influence on the activity.