High Efficiency Mixed Amine Adsorbents for Directly Capturing Carbon Dioxide from Air

doi:10.1007/s40242-024-4206-2

Abstract

Abstract: The development of effective adsorbents with high amine efficiency and CO₂ adsorption almost unaffected by humidity is extremely challenging. In this study, we introduce an innovative solid amine adsorbent, TETA/DEA@FS, composed of triethylenetetramine (TETA) and diethanolamine (DEA) functionalized fumed silica (FS), which exhibits exceptional capability in selectively capturing trace CO₂ from N₂. TETA/DEA@FS shows an exceptionally high capacity of CO₂ adsorption of 1.13 mmol/g at the temperature of 298 K and the pressure of 0.0004 bar (1 bar=100 kPa), and achieves an unprecedented CO₂/N₂ IAST selectivity of 1.70×10¹². TETA/DEA@FS exhibits high amine efficiency, with breakthrough experiments demonstrating that CO₂ adsorption remains nearly unaffected by humidity. Meanwhile, TETA/DEA@FS demonstrates rapid CO₂ adsorption kinetics and outstanding cyclic stability.

Key words: Direct air capture (DAC), CO₂, N₂, Triethylenetetramine, Diethanolamine

WU Yilu, ZHENG Haolong, XIA Zihan, FU Chengmin, XU Feng, YAN Jian. High Efficiency Mixed Amine Adsorbents for Directly Capturing Carbon Dioxide from Air[J]. Chemical Research in Chinese Universities, 2025, 41(1): 138-145.

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