Abstract
Propane oxidative dehydrogenation (PODH) was studied using VOx/γAl2O3 and VOx/ZrO2–γAl2O3 catalysts and consecutive propane injections. These catalysts were synthesized with 2.5, 5, and 7.5 wt % vanadium (V) loadings. Temperature-programmed reduction by hydrogen displayed one reduction peak for VOx/γAl2O3 and two for VOx/ZrO2–γAl2O3 (5 and 7.5 wt % vanadium). Temperature-programmed desorption of ammonia (NH3-TPD) and pyridine Fourier transform infrared spectroscopy showed that zirconia on γAl2O3 reduces the catalyst acidity. NH3-TPD kinetics gave for VOx/ZrO2–γAl2O3 higher desorption activation energies than those for VOx/γAl2O3. PODH runs in the Chemical Reactor Engineering Center Riser Simulator were developed under an oxygen-free atmosphere at 550 °C, close to 1 atm, 20 s, and a 42.0 catalyst/propane weight ratio (g/g). PODH runs for the 7.5% V/ZrO2–γAl2O3 showed (a) 93% propylene selectivity and 25% propane conversion (based on propane converted into gaseous carbon-containing products), (b) 85% propyl...
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