Review of high temperature H₂S removal from syngas: Perspectives on downstream process integration

Mixed-metal based adsorbents has attracted attention on syngas purification processes, because of its high H₂S adsorption performance, efficiency, and stability in high operating temperature. However, studies on mixed-metal adsorbents are still limited to basic adsorption behavior of the absorbent. This review tries to provide a deep view on the research of H₂S removal adsorbent based on mixed-metal oxide and potential future directions for the development of mixed-metal oxide as H₂S adsorbent from syngas (e.g., Zn-Fe based adsorbents). Proper understanding of the synergy and manufacturing challenges for certain combination of various metal oxide could open the way for the synthesis of high performing H₂S adsorbent. Additionally, better understanding of the adsorption mechanisms of these adsorbents is also needed to enhance and optimize their performance. To that end, this paper discusses current mixed-metal oxide adsorbents research situation, challenges, and possible future research directions.