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Abstract
X-ray absorption spectroscopy has been used to obtain information on the Co and Mo structures present in calcined CoMoAl 2O 3 and MoAl 2O 3 catalysts. The results indicate that the elements are present in disordered structures. From a detailed analysis of the X-ray absorption fine structure (EXAFS), information on the oxygen coordination around Co and Mo is obtained. An apparent decrease in the oxygen coordination number around Mo with increasing Mo loading is explained by a change in the Debye-Waller factor, presumably due to a decrease in the support interactions. The presence of Co in the catalysts is found to have very little effect on the local structure around the Mo atoms. The Co EXAFS results indicate that Co is predominantly octahedrally coordinated.
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