(544fr) Structure/Redox/Reactivity Properties of Dispersed Vanadium Species on TiO2 for the Oxidative Dehydrogenation of Propane with CO2
In this work, we aim at developing a model system based on vanadium supported catalysts in order to reveal structural-activity relationships via in-situ Raman spectroscopy for the ODH of light alkanes using CO2. In the first step, we investigate the temperature â dependent evolution of dispersed vanadium species on different metal oxide supports with the ultimate goal to unravel the temperature range that different sites exist on the catalyst surface. We show that above 573K, the vanadium species maintain a mono-oxo configuration in monomeric units. At higher loadings, small crystals of V2O5 observed which are probably getting redispersed upon air treatment at elevated temperatures. The redox behavior of these materials at different temperature ranges as revealed by coupling Raman spectroscopic measurements with labeled C18O2 will be also discussed to pin down the reoxidation mechanisms of V2O5/MexOy in ODH. Relevant catalytic performance data will be presented as an attempt to close the structural-activity relationship loop.
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