Abstract
Iron-substituted boehmite gel has been prepared by alkoxy synthesis, i.e., by reaction of Fe(acac)3 with a fresh surface of AlOOH. Iron-aluminum complex oxide catalysts for liquid-phase oxidation of hexadecane were prepared by annealing the gel precursors. The gels with 0-20 wt.% of iron loading were studied by magnetic susceptibility and Mössbauer spectroscopy. Depending on the iron concentration, differing amounts of paramagnetic Fe3+ ions in the boehmite structure and small ferrimagnetic spinel clusters were observed in the X-ray amorphous precursors. Thermal treatment led to formation of substituted spinels, FexAl2−xO3, as well as γ-ferric oxide clusters. The overall rate of hexadecane oxidation increased with an increase in the relative content of magnetic clusters. The inclusion of nonmagnetic Al3+ ions in the γ-Fe2O3 lattice reduced the number of terminal Fe3+ O groups and the overall catalytic activity. The role of electronically excited terminal oxygen on the surface of γ-ferric oxide clusters in the mechanism of hexadecane oxidation is discussed.
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