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

中文翻译：

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功能化的离子液体促进了CO2在胺浸渍的吸附剂上的吸附

胺浸渍的吸附剂是用于胺水溶液捕获CO _2的有前途的替代方法。但是，扩散控制的CO ₂吸附过程是与之相关的重要问题，导致胺基的利用不足。在此，我们建议使用对CO ₂具有化学反应活性且粘度低的功能化离子液体1-乙基-3-甲基咪唑鎓乙酸盐（[emim] [Ac]）作为胺浸渍吸附剂的添加剂。关键是[emim] [Ac]与CO ₂反应后，粘度没有急剧增加。以聚乙烯亚胺（PEI）浸渍的SBA-15为模型系统，发现CO ₂加入[emim] [Ac]后，PEI / SBA-15复合材料的容量提高了86％，活性位点效率提高了270％。在PEI / SBA-15复合材料中添加[emim] [Ac]也有助于提高复合材料的CO ₂吸附速率和循环稳定性。因此，[emim] [Ac]提供了制造胺浸渍吸附剂的机会，同时提高了CO ₂容量，吸附动力学和循环稳定性。©2018美国化学工程师学会AIChE J，64：3671–3680，2018