Synergy Effect of Acid Radical Anchors and Active Sites Protection in Co‐Based Spinel Catalyst for Efficient Amine Solution Regeneration During CO<sub>2</sub> Capture
Xinling Zhong, Weixin Kong, Kexuan Yang, Tao Song, Zhiyuan Dong, Lehang Liang, Shihan Zhang, Wei Li, Sujing Li
Abstract
Abstract Solid acid catalysts (SACs) have attracted significant attention for their role in enhancing the carbon capture desorption process, primarily due to their active acid sites. By employing a synergistic strategy involving acid anchoring and structural design, both the catalytic activity and durability of the catalyst throughout the desorption process are optimized. The TiO 2 shell layer in the Mn 2 CoO 4 @TiO 2 /SO 4 2− (MC@TiO 2 /S) catalyst effectively inhibits the leaching of active species into the solution, thereby enabling sustained high activity over ten cycles of absorption–desorption testing. The anchoring of protonated groups (SO 4 2− ) facilitates a novel pathway for proton transfer in solution via proton‐coupled electron transfer (PCET) effect, significantly reducing activation energy for this step and enhancing desorption reaction kinetics. Consequently, CO 2 regeneration capacity and regeneration rate increase by 103% and 111%, respectively, while energy consumption during regeneration decreases by ≈44%. Additionally, the environmental performance of the catalyst is evaluated using life cycle assessment (LCA), highlighting its sustainable potential for future scale‐up applications. This study presents a viable strategy for employing metal oxide solid acid materials to facilitate efficient and low‐energy solvent regeneration in carbon capture processes.