Abstract
Application of the pseudo-homogenous and steady-state adsorption model (SSAM) was analyzed for the description of the oxidative dehydrogenation (ODH) of propane over vanadia-titania catalyst, using an extensive set of the experimental data. It has been shown that the SSAM model adequately describes the kinetics of the studied reaction for a broad range of feed mixture, propane conversion and temperature. The pseudo-homogenous models must be consider as a rough approximation of the experimental results. It is possible to solve analytically the set of differential equations describing the SSAM model and to present the selectivities to propene and to the products of total oxidation (CO, CO 2) as a function of the propane conversion and the temperature. Numerical methods (the Runge–Kutta method combined with the Levenberg–Marquardt method) were applied to solve the systems of differential equations which describe the kinetic of the ODH of propane as a function of contact time and to fit the solutions to the experimental data. The calculations allowed us to determine the rate constants (activation energies and pre-exponential factors) for all reaction steps considered.
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