Steady state kinetic parameters of bulk V2O5 for ethane and propane oxidation reactions

The kinetics of ethane and propane oxidation reactions over bulk V2O5 suggests that the sum of the pre-exponential factors for alkene formation and direct alkane oxidation to CO2 is closely related to the alkane oxidation activity. Furthermore, the activation energy for ethene formation is found to be greater. The alkene yield at iso-conversion is explained in terms of two lumped rate constant ratios, k1/k2 and k1/(k3 + k4), which are functions of specific alkane oxidized. The k1/k2 and k1/(k3 + k4) ratios represent the amount of alkane available for the ODH reaction and the net alkene formed. The k1/k2 and k1/(k3 + k4) values are higher for propane, which corresponds to the higher propene yield at iso-conversion.