Journal
RSC ADVANCES
Volume 5, Issue 50, Pages 39643-39650Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra06936j
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Funding
- Sasol technology RD
- National Research Foundation (NRF)
- Department of Science and Technology (DST) of South Africa
- European Union [312483]
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Ferrihydrite is a short range ordered iron(III) oxyhydroxide that has been recently recognized as a good catalyst for Fischer-Tropsch synthesis of liquid hydrocarbons. Despite the critical role of ferrihydrite in many disciplines, its mineral structure remains a topic of debate. The main aspect of its structure which has been debated is the presence or absence of tetrahedrally coordinated Fe3+ in its mineral structure. In this work, electron energy-loss spectroscopy (EELS) was used to probe the Fe L-2,L-3 edges of ferrihydrite and reference spectra of different iron oxide compounds and the percentage of Fe3+ in T-d symmetry was estimated from non-linear least squares (NLLS) fitting coefficients. EELS results demonstrate that Fe3+ in T-d coordination is present in substantial amounts in the structure of ferrihydrite. These findings were supported by Mossbauer spectroscopy results performed on the same ferrihydrite samples.
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