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

Yakushkin, S. S.; Bukhtiyarova, G. A.; Dubrovskiy, A. A.; Knyazev, Yu. V.; Balaev, D. A.; Martyanov, O. N. Source: APPLIED MAGNETIC RESONANCE, 50 (5):725-733; 10.1007/s00723-019-1109-3 MAY 2019

The stability of a catalyst for partial H2S 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-Fe2O3 iron oxide nanoparticles supported on silica have been examined for their stability under the selective H2S oxidation conditions. The combination of the physicochemical methods has been used to study the state of reacted catalysts. The ε-Fe2O3 phase has been found to remain stable under the selective H2S 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-Fe2O3 nanoparticles retain their structure and magnetic properties in the presence of H2S at high temperatures. During the in situ FMR experiments, the ε-Fe2O3 sulfidation process has been studied.