Abstract
Iron oxides modified by semi-coke sorbents (referred to as FeSC) were prepared by the hydrothermal impregnation method and were used for the selective catalytic oxidation of H₂S to sulfur. The physicochemical properties of samples were characterized by Brunauer–Emmett–Teller analysis, scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetry (TG), and X-ray photoelectron spectroscopy. The results showed that iron oxide could be highly loaded on semi-coke with a microporous structure and high specific surface area. Fe₂O₃ was considered the only major active component on the surface of the sorbent. Fe7SC stably maintained the catalytic performance at 180 °C with the longest breakthrough time and highest release sulfur capacity. There was no benefit to desulfurization with excess oxygen in the feed gas. Through further analysis by TG, elemental sulfur was confirmed to be the main product of the catalytic oxidation of H₂S. Besides, a possible mechanism of H₂S selective catalytic oxidation over sorbent was proposed, in which the key step was the oxidation of FeS into S⁰ and Fe³⁺ by O₂. Moreover, sorbent deactivation was mainly caused by pore structure blockage by the sulfur product.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
