Comparative Analysis on Carbon Mitigation by High-Temperature Lithium Adsorption Systems

Hong Du, Jiaqi Ruan, Yunlin Li and Changlei Qin ()
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Hong Du: Science and Technology Education Research and Communication Center, Chongqing Normal University, Chongqing 401331, China
Jiaqi Ruan: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems of Ministry of Education, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China
Yunlin Li: Science and Technology Education Research and Communication Center, Chongqing Normal University, Chongqing 401331, China
Changlei Qin: Key Laboratory of Low-Grade Energy Utilization Technologies and Systems of Ministry of Education, School of Energy and Power Engineering, Chongqing University, Chongqing 400044, China

Energies, 2025, vol. 18, issue 11, 1-14

Abstract: High-temperature adsorption is a promising technology for carbon mitigation, and it can be applied in direct carbon capture and the integration with utilization. Lithium-based adsorbents, known for their high CO 2 uptake and rapid kinetics, have garnered significant interest. However, adsorption performance, cycling stability, and degradation behavior of this type of adsorbent are rarely reported and compared under comparable conditions. In this work, nine lithium-based adsorbents were synthesized and characterized for their physicochemical properties. Dynamic and isothermal thermogravimetric analysis were conducted to determine adsorption/desorption equilibrium temperatures, evaluate CO 2 adsorption characteristics under varying thermal conditions, and assess cycling stability over 20 adsorption–desorption cycles. The results reveal exceptional initial CO 2 capacities for α-Li 5 AlO 4 , Li 5 GaO 4 , Li 5 FeO 4 , and Li 6 ZnO 4 ; however, these values decline to 30.2 wt.%, 24.3 wt.%, 41.6 wt.%, and 44.2 wt.% after cycling. In contrast, Li 2 CuO 2 and Li 4 SiO 4 exhibit lower initial capacities but possess superior cycling stability with final values of 21 wt.% and 21.6 wt.%. Phase composition and microstructural analysis identify lithium carbonate and metal oxides as primary products, and microstructural sintering was observed during cycling. This study could provide insights into the trade-offs between the initial capacity and cycling stability of lithium-based adsorbents, offering guidelines for adsorbent optimization through doping or pore engineering to advance high-temperature CO 2 capture technologies.

Keywords: high-temperature carbon adsorption; lithium adsorbents; cyclic adsorption and desorption (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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