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Abstract
Experiments have been conducted to determine the global kinetics for lean-fuel propane oxidation on a transition metal oxide catalyst. The catalyst used was composed of chromium and cobalt oxides (Cr2O3, CO3O4) deposited on alumina washcoated honeycomb ceramic substrates.
The heterogeneous propane oxidation was modelled by a global mechanism consisting of the following three first order reactions;
To determine the rate parameters it was necessary to carry out two sets of experiments using C3H8 and CO as fuel, respectively. In both experiments, the axial concentrations and temperature profiles in the bed were measured for a variety of inlet conditions. From the experimental data, the rate parameters for the three steps were determined. The CO oxidation kinetics was determined by a differential as well as an integral method and the results were in good agreement with each other. The CO oxidation kinetics was used in conjunction with the measured data for propane oxidation to compute the rate parameters for the other two steps. The rate expressions thus determined are
