Improving CO2 solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect

doi:10.1016/j.cjche.2024.11.024

Chinese Journal of Chemical Engineering ›› 2025, Vol. 80 ›› Issue (4): 100-109.DOI: 10.1016/j.cjche.2024.11.024

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Improving CO₂ solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect

Haoran Yin¹, Lili Mu¹, Yifeng Chen², Licheng Li¹, Kang Sun², Xiaoyan Ji³

1 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;
2 Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory of Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, China;
3 Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden

Received:2024-09-08 Revised:2024-10-27 Accepted:2024-11-27 Online:2025-03-03 Published:2025-04-28
Contact: Yifeng Chen,E-mail:yfchen@icifp.cn;Licheng Li,E-mail:llc0024@yahoo.com
Supported by:
We would like to thank the National Natural Science Foundation of China (22108115, 22478415, and 21978134) and Natural Science Foundation of Jiangsu Province (BK20241744).

Improving CO₂ solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect

Haoran Yin¹, Lili Mu¹, Yifeng Chen², Licheng Li¹, Kang Sun², Xiaoyan Ji³

1 Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, China;
2 Institute of Chemical Industry of Forest Products, CAF, National Engineering Laboratory for Biomass Chemical Utilization, Key and Open Laboratory of Forest Chemical Engineering, SFA, Key Laboratory of Biomass Energy and Material, Nanjing 210042, China;
3 Energy Engineering, Division of Energy Science, Luleå University of Technology, Luleå 97187, Sweden

通讯作者: Yifeng Chen,E-mail:yfchen@icifp.cn;Licheng Li,E-mail:llc0024@yahoo.com
基金资助:
We would like to thank the National Natural Science Foundation of China (22108115, 22478415, and 21978134) and Natural Science Foundation of Jiangsu Province (BK20241744).

Abstract

Abstract: Confinement effect is an effective method to enhance carbon dioxide (CO₂) solubility. In this study, a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([Hmim][NTf₂])/mesoporous titanium dioxide (M-TiO₂)/water (H₂O) was developed, and its confinement effect was regulated by changing the pore structure of M-TiO₂. CO₂ solubility in the hybrid sorbent was measured experimentally, and the thermodynamic properties including Henry's constant and desorption enthalpy were calculated. Furthermore, the confinement effect in the hybrid sorbent was quantified. Additionally, the hybrid sorbent was recycled with a multi-cycle experiment. The results showed that M-TiO₂ calcined at 773.2 K (MT500) could lead to an efficient confinement effect. CO₂ solubility in the hybrid sorbent increased by 49.8% compared to that of H₂O when the mass fraction of [Hmim][NTf₂]/MT500 was 5.0% (mass), where the contribution of confinement effect on Gibbs free energy occupied 5.2%.

Key words: Ionic liquid, Carbon dioxide, Mesoporous titanium dioxide, Confinement effect, Thermodynamics

摘要： Confinement effect is an effective method to enhance carbon dioxide (CO₂) solubility. In this study, a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide ([Hmim][NTf₂])/mesoporous titanium dioxide (M-TiO₂)/water (H₂O) was developed, and its confinement effect was regulated by changing the pore structure of M-TiO₂. CO₂ solubility in the hybrid sorbent was measured experimentally, and the thermodynamic properties including Henry's constant and desorption enthalpy were calculated. Furthermore, the confinement effect in the hybrid sorbent was quantified. Additionally, the hybrid sorbent was recycled with a multi-cycle experiment. The results showed that M-TiO₂ calcined at 773.2 K (MT500) could lead to an efficient confinement effect. CO₂ solubility in the hybrid sorbent increased by 49.8% compared to that of H₂O when the mass fraction of [Hmim][NTf₂]/MT500 was 5.0% (mass), where the contribution of confinement effect on Gibbs free energy occupied 5.2%.

关键词: Ionic liquid, Carbon dioxide, Mesoporous titanium dioxide, Confinement effect, Thermodynamics

Haoran Yin, Lili Mu, Yifeng Chen, Licheng Li, Kang Sun, Xiaoyan Ji. Improving CO₂ solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect[J]. Chinese Journal of Chemical Engineering, 2025, 80(4): 100-109.

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Improving CO₂ solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect

Improving CO₂ solubility in a hybrid sorbent of 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide/mesoporous titanium dioxide/water with confinement effect

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