Jiang et al. (2023): Synergetic enhancement of CO2 direct air capture with monoethanolamine-impregnated MIL-101(Cr) MOFs

Kun Jiang, Jian Yang, Yuxin Zhou, Jinlou Gu IN: Microporous and Mesoporous Materials, 366, 112920, https://doi.org/10.1016/j.micromeso.2023.112920

Herein, the authors have successfully impregnated monoethanolamine (MEA) into MIL-101(Cr), resulting in a notably high CO₂ adsorption capacity up to 1.20 mmol/g and an impressive amine utilization efficiency of 23% under low CO₂ partial pressure (400 ppm). This improved capture efficiency can be attributed to the presence of hydroxyl groups, which alter the reaction dynamics between CO₂ and amine groups. They designed a system capable of testing DAC performance and employed MEA-impregnated MIL-101(Cr) for DAC testing. The adsorbent achieved pseudo-equilibrium DAC capacities of 2.15 and 1.50 mmol/g under humid and dry conditions, respectively, signifying an enhancement in DAC performance under humid condition. The study offers novel perspectives for DAC adsorbent research, encompassing both material and equipment considerations.

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