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

Abstract

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.