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EXAFS study of Fe(3+) interaction with ZrO2 and TiO2 oxides

Kriventsov, V V and Kochubey, D I and Colon, G and Hidalgo, M C and Navio, J A and Tsodikov, M V and Maksimov, Yu V (2005) EXAFS study of Fe(3+) interaction with ZrO2 and TiO2 oxides. Physica Scripta, T115 . pp. 736-739.

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The forms of Fe(3+) ions stabilization on TiO2, ZrO2 oxide nanoparticles and their composition were studied by EXAFS spectroscopy. The structure of the iron local surrounding was investigated with respect to: preparation method, coverage, support crystal modification, acidity of oxide surface and way of iron introduction into oxide matrix. For all oxides, it was shown that Fe(3+) ions stabilized mainly on the nanoparticle surfaces as isolated ions at low coverage. The location of these ions on the oxide surface depends on the correlation between Fe-O bond length and Me-O (Me = Ti, Zr) interatomic distances of oxide carriers. The increase of surface coverage results in formation of two-dimension layer structures. For the ZrO2-TiO2 composition, it should be noted that the iron cations interact mainly with zirconia. A few structural models of different iron locations were discussed.

Item Type:Article
ID Code:5474
Deposited By:Prof. Alexey Ivanov
Deposited On:06 Feb 2010 11:11
Last Modified:06 Feb 2010 11:53

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