Siberian Federal University

The effect of structural characteristics of single- phase hematite samples with the α- Fe2O3 structure on the catalytic properties in the methane oxidative conversion (oxidizer O2) at 750 °C was studied. Catalysts with different structural parameters were obtained by calcination of iron (III) oxide at temperatures of 800, 900, 1000, and 1100 °C. It is shown that the catalytic characteristics of the α-Fe2O3 samples differ significantly. An increase in the calcination temperature of the catalysts in the range of 800–1100 °C leads to a significant ~ 30-fold decrease in the specific rate of methane conversion. Calcined catalysts also exhibit different selectivity in the formation of products, CO2, CO and C2H6. Calcination at 800–900 °C leads to the formation of deep oxidation catalysts, with a CO2 selectivity of about 93–96 %. The CO selectivity and C2H6 selectivity increase with increasing calcination temperature and amounts of 14 and 55 %, respectively, on a catalyst calcined at 1100 °C. The observed catalytic patterns are due to structural changes with an increase in the calcination temperature of α-Fe2O3, which are manifested in a decrease in the volume defect of the samples, a decrease in the degree of defect in the crystal lattice of the oxide, in the formation of Fe2+ ions on the surface and in an increase, respectively, the binding energy of the lattice oxygen