Abstract
The structure of a series of Fe/Al<sub>2</sub>O<sub>3</sub> catalysts containing from 1 to 24 weight percent iron has been examined by XRD, EXAFS, Mössbauer, ESCA, and gravimetric analysis. Two iron phases, Fe<sub>2</sub>O<sub>3</sub> and Fe<sup>+3</sup> in solid solution in the alumina support, are characterized as a function of iron loading. The combination of ESCA H<sub>2</sub> titration and gravimetric analysis allows both quantitative and qualitative measurement of the two species. The amount of Fe<sub>2</sub>O<sub>3</sub> phase increases with increasing iron loading for Fe1 to Fe24, whereas the amount of Fe<sup>+3</sup> solid-solution phase increases with increasing iron loading for Fe1 to Fe6 and then levels off to approximately 2.2 wt % Fe for Fe8 to Fe24. The particle size of the Fe<sub>2</sub>O<sub>3</sub> phase, determined from ESCA measurements, increases with increasing iron loading.
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