Promoted adsorption of CO2 on amine‐impregnated adsorbents by functionalized ionic liquids |
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| Authors: | Fujian Liu Kuan Huang Lilong Jiang |
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| Affiliation: | 1. National Engineering Research Center for Chemical Fertilizer Catalyst (NERC‐CFC), School of Chemical Engineering, Fuzhou University, Fuzhou, Fujian, 350002, China;2. Poyang Lake Key Laboratory of Environment and Resource Utilization (Nanchang University), Ministry of Education;3. School of Resources Environmental and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China |
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| Abstract: | Amine‐impregnated adsorbents are promising alternatives to aqueous amines for CO2 capture. However, the diffusion‐controlled CO2 adsorption process is a significant issue associated with them, resulting in the insufficient utilization of amine groups. Herein, we propose the use of functionalized ionic liquids 1‐ethyl‐3‐methylimidazolium acetate (emim]Ac]) with chemical reactivity to CO2 and low viscosity as the additive to amine‐impregnated adsorbents. The key is that emim]Ac] does not show drastic increase in viscosity after reacting with CO2. Taking the polyethyleneimine (PEI)‐impregnated SBA‐15 as a model system, it is found that the CO2 capacities of PEI/SBA‐15 composites are improved by 86%, and the active site efficiencies are improved by 270%, after the addition of emim]Ac]. The addition of emim]Ac] to PEI/SBA‐15 composites also helps improve the CO2 adsorption rate and recycling stability of composites. Therefore, emim]Ac] offers the opportunity to fabricate amine‐impregnated adsorbents with simultaneously improved CO2 capacities, adsorption kinetics, and recycling stability. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3671–3680, 2018 |
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| Keywords: | CO2 adsorption solid amines ionic liquids thermodynamics kinetics |
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