In Situ FMR Study of the Selective H2S-Oxidation Stability of ε-Fe2O3/SiO2 Catalysts

• Published in: Applied magnetic resonance 2019-05, Vol.50 (5), p.725-733
• Main Authors: Yakushkin, S. S., Bukhtiyarova, G. A., Dubrovskiy, A. A., Knyazev, Yu. V., Balaev, D. A., Martyanov, O. N.
• Format: Article
• Language: English
• Subjects: Atoms and Molecules in Strong Fields; Catalysts; Ferric oxide; Ferromagnetic resonance; Ferromagnetism; High temperature; Hydrogen; Investigations; Iron oxides; Laser Matter Interaction; Magnetic properties; Mossbauer spectroscopy; Nanoparticles; Organic Chemistry; Original Paper; Oxidation; Particle size; Physical Chemistry; Physics; Physics and Astronomy; Radiation; Silicon dioxide; Solid State Physics; Spectroscopy/Spectrometry; Spectrum analysis; Stability; Sulfidation; Sulfur; Temperature
• ISSN: 0937-9347; 1613-7507
• DOI: 10.1007/s00723-019-1109-3

The stability of a catalyst for partial H 2 S oxidation has been studied by the ferromagnetic resonance (FMR) technique combined with transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, and magnetostatic investigations. The ε-Fe 2 O 3 iron oxide nanoparticles supported on silica have been examined for their stability under the selective H 2 S oxidation conditions. The combination of the physicochemical methods has been used to study the state of reacted catalysts. The ε-Fe 2 O 3 phase has been found to remain stable under the selective H 2 S oxidation conditions at temperatures up to 300 °C. The active phase state during the catalytic reaction has been explored using in situ FMR experiments. It has been established that the ε-Fe 2 O 3 nanoparticles retain their structure and magnetic properties in the presence of H 2 S at high temperatures. During the in situ FMR experiments, the ε-Fe 2 O 3 sulfidation process has been studied.