Promotional effects of CO2 on the oxidative dehydrogenation of propane over mesoporous VOx/γAl2O3 catalysts

CO2 assisted oxidative dehydrogenation (ODH) propane to propylene over fluidizable mesoporous VOx/La2O3-gamma Al2O3 catalysts has been investigated. The mixed oxide of La2O3 and gamma Al2O3 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 H-2-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 degrees C. The introduction of CO2 significantly enhanced both the propane conversion and propylene selectivity. Among the studied catalysts, VOx/gamma-Al2O3 catalyst showed highest propylene yields (42.7%) at 550 degrees C. (C) 2020 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

Automated summary

The study investigated the CO2-assisted oxidative dehydrogenation of propane to propylene over fluidizable mesoporous VOx/La2O3-gamma-Al2O3 catalysts, with the La and gamma-Al2O3 mixed oxide catalysts exhibiting desired properties and significant enhancement in performance under CO2 assistance. Among the catalysts tested, the VOx/gamma-Al2O3 catalyst showed the highest propylene yield at 550 degrees Celsius.