Study of the Fe/γ-Al2O3 Catalytic System by Varying Atmosphere and Temperature

The catalytic Fe/γ-Al 2 O 3 system in air, CO, and H 2 atmospheres has been studied in the temperature range of 293–773 K. In the initial state, the system contains at least two Fe 3+ paramagnetic forms with close values of isomeric shift and different quadrupole splittings. In this system, iron is...

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Bibliographic Details
Published in:Crystallography reports 2020-05, Vol.65 (3), p.367-370
Main Authors: Brodskiy, A. R., Yaskevich, V. I.
Format: Article
Language:English
Subjects:
Aluminum oxide
Crystallography and Scattering Methods
Iron
Physics
Physics and Astronomy
Proceedings of the XV International Conference “Mössbauer Spectroscopy and Its Applications”
Quadrupoles
Transitional aluminas
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Summary:The catalytic Fe/γ-Al 2 O 3 system in air, CO, and H 2 atmospheres has been studied in the temperature range of 293–773 K. In the initial state, the system contains at least two Fe 3+ paramagnetic forms with close values of isomeric shift and different quadrupole splittings. In this system, iron is reduced to the Fe 2+ state in an atmosphere of СО and Н 2 at 423–773 K. The latter state also exists in at least two forms. The processes occurring in the system and the nature of the found iron forms are discussed.
ISSN:1063-7745
1562-689X
DOI:10.1134/S1063774520030062