Abstract
Transport reduction was shown to allow finely controlling the Fe+ 3/Fe+ 2 ratio in iron-oxygen two-dimensional nanostructures (nanolayers, thickness 3-15 Å) on silica. It was found by Müossbauer spectroscopy that isolated surface iron-oxygen groups >-Si-O-Fe(OH)2 and (>-Si-O-)2FeOH are not reduced at 400-600°C, which is explained by their covalent bonding with silica. The transport reduction of samples with applied nanolayers (one and four) at T ≥ 600°C was shown to form bulk phases [iron(II) silicate and metallic iron] on the silica surface. The features of structural-chemical transformations on transport reduction of iron-oxygen nanolayers on supports are primarily associated with the specifics of phase formation in nanostructures.
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Smirnov, V.M., Voronkov, G.P., Semenov, V.G. et al. Structural-Chemical Transformations of Two-Dimensional Iron-Oxygen Nanostructures in the Course of Transport Reduction. Russian Journal of General Chemistry 71, 1506–1512 (2001). https://doi.org/10.1023/A:1013965912185
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DOI: https://doi.org/10.1023/A:1013965912185