Abstract
CO2 assisted oxidative dehydrogenation (ODH) propane to propylene over fluidizable mesoporous VOx/La2O3-γAl2O3 catalysts has been investigated. The mixed oxide of La2O3 and γAl2O3 were synthesized by the co-precipitation technique and VOx was deposited on the supports by an incipient wetness impregnation approach. The prepared catalysts were characterized by various physicochemical characterizations to establish the desired properties of the catalysts. The H2-TPR indicated the supported VOx reduced in a single stage, indicating the formation of a homogeneous specie. Both the acidity and surface area of the catalysts decreased with increase of La content, as confirmed by the NH3-TPD and BET analysis, respectively. The CO2 assisted ODH of propane experiments were developed in a fluidized CREC Riser Simulator at 520–600°C. The introduction of CO2 significantly enhanced both the propane conversion and propylene selectivity. Among the studied catalysts, VOx/γ-Al2O3 catalyst showed highest propylene yields (42.7%) at 550°C.
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