Abstract
AbstractXPS, Raman, diffuse reflectance spectroscopy and analytical electron microscopy techniques were used to investigate the influence of the sequence of impregnation (Mo or Co first) on the state and dispersion of cobalt in CoMo/Al2O3 catalyst in its precursory oxidic state (3 wt% Co3O4 and 12 wt% MoO3). The results indicate that impregnating Mo first promotes both the dispersion of the cobalt containing phase and the formation of CoAl2O4 like species at the expense of ‘free’ cobalt in Co3O4 like compounds.
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