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  • Title: On the presence of Fe(IV) in Fe-ZSM-5 and FeSrO3-x --unequivocal detection of the 3d4 spin system by resonant inelastic X-ray scattering.
    Author: Pirngruber GD, Grunwaldt JD, van Bokhoven JA, Kalytta A, Reller A, Safonova OV, Glatzel P.
    Journal: J Phys Chem B; 2006 Sep 21; 110(37):18104-7. PubMed ID: 16970419.
    Abstract:
    The contribution of a 3d(4) spin configuration to the valence electronic structure of Fe compounds can be probed via spin-selective Fe K-pre-edge absorption spectra, using resonant inelastic X-ray scattering (RIXS). The 3d(4) configuration of Fe(IV) can be unequivocally detected even in a mixture with the high-spin 3d(5) configuration of Fe(III). This is demonstrated on the perovskite FeSrO(3-x) with formal oxidation state Fe(IV). When the technique was applied to an Fe-ZSM-5 catalyst during reaction with N(2)O, no 3d(4) configuration was detected. The formation of Fe(IV) upon reaction of Fe-ZSM-5 with N(2)O can, therefore, be ruled out.
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