(544ga) Oxidative Dehydrogenation of Propane to Propylene over VOx/CaO-?Al2O3

This communication presents the kinetics of oxidative dehydrogenation (ODH) of propane to propylene over VO_x/CaO-𝛾Al₂O₃ and VO_x/CaO-𝛾Al₂O₃ catalysts in absence of gas phase oxygen. In addition to their catalytic role, the catalysts also serve as the source of lattice oxygen. XRD and temperature programmed reduction analysis indicate the availability of different types of VO_x species on the prepared catalysts surfaces. The presence of CaO influences the formation of VO_x species, reducibility and oxygen carrying capacity of the catalysts. All these have significant influence on propylene selectivity. The ODH of propane experiments are conducted in a CREC Riser Simulator under circulating fluidized bed conditions. It is observed that VOx/CaO-𝛾Al₂O₃ displays higher propylene selectivity (94.1%) and the lower selectivity of CO₂ due to it’s moderate active sites-support interactions.