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.
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.
Pirngruber
Gerhard D
GD
Institute of Chemical and Bioengineering, ETH Zurich, Zurich, Switzerland. pirngruber@chem.ethz.ch
Grunwaldt
Jan-Dierk
JD
van Bokhoven
Jeroen A
JA
Kalytta
Andreas
A
Reller
Armin
A
Safonova
Olga V
OV
Glatzel
Pieter
P
D001703:Biophysics / Q000379:methods*; D002384:Catalysis; D002627:Chemistry, Physical / Q000379:methods*; D004583:Electrons; D005290:Ferric Compounds / Q000737:chemistry; D007501:Iron / Q000737:chemistry*; D008024:Ligands; D009584:Nitrogen / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry*; D012542:Scattering, Radiation; D013324:Strontium / Q000737:chemistry*; D014965:X-Rays; D017641:Zeolites / Q000737:chemistry*
D005290:Ferric Compounds; D008024:Ligands; D017641:Zeolites; C000499:ferric oxide; D007501:Iron; D009584:Nitrogen; D010100:Oxygen; D013324:Strontium