Quantitative Characterization of Fe/Al 2 O 3 Catalysts. Part I: Oxidic Precursors

Abstract

The structure of a series of Fe/Al₂O₃ catalysts containing from 1 to 24 weight percent iron has been examined by XRD, EXAFS, Mössbauer, ESCA, and gravimetric analysis. Two iron phases, Fe₂O₃ and Fe⁺³ in solid solution in the alumina support, are characterized as a function of iron loading. The combination of ESCA H₂ titration and gravimetric analysis allows both quantitative and qualitative measurement of the two species. The amount of Fe₂O₃ phase increases with increasing iron loading for Fe1 to Fe24, whereas the amount of Fe⁺³ 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 Fe₂O₃ phase, determined from ESCA measurements, increases with increasing iron loading.

Keywords

Mössbauer spectroscopy Surface analysis X-ray diffraction Catalysts Fe ESCA X-ray photoelectron spectroscopy

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