Generally, amine group captures CO₂ according to 2:1 or 1:1 stoichiometry. Here, we report a kind of improved carbon capture using amino‐functionalized ionic liquids (ILs) through 1:2 stoichiometry. A serial of amino‐functionalized ILs various with basicity and steric hindrance of anion were designed, prepared, and applied in CO₂ capture. Through a combination of absorption experiment, quantum chemical calculation, spectroscopic investigation and calorimetric method, the results indicated that one amine group could bind two CO₂ through proton transfer (PT) process and intramolecular hydrogen bond formation, which leading to enhanced capacity that breaks through equimolar. The basicity and steric hindrance of anion play a significant role in promoting amine group to capture two CO₂. [P₆₆₆₁₄]₂[Asp] with dual anion was further designed and synthesized to promote PT process, which showed high capacity of 1.96 mol/mol IL at 30°C and 1 atm as well as excellent reversibility. © 2018 American Institute of Chemical Engineers AIChE J, 65: 230–238, 2019

中文翻译：

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设计基于氨基的离子液体以改善碳捕获：一种胺结合两种二氧化碳

通常，胺基根据2：1或1：1化学计量比捕获CO ₂。在这里，我们报告了一种通过1：2化学计量比使用氨基官能化离子液体（IL）改善碳捕获的方法。设计，制备了一系列具有碱性和阴离子位阻的氨基官能化IL，并将其应用于CO ₂捕集。通过吸收实验，量子化学计算，光谱学研究和量热法的结合，结果表明一个胺基可以结合两个CO _2。通过质子转移（PT）过程和分子内氢键的形成，从而提高了穿透等摩尔分子的能力。阴离子的碱性和位阻在促进胺基捕获两个CO ₂方面起着重要作用。进一步设计并合成了具有双阴离子的[P ₆₆₆₁₄ ] ₂ [Asp]以促进PT过程，该过程在30°C和1个大气压下显示出1.96 mol / mol IL的高容量，并且具有出色的可逆性。©2018美国化学工程师学会AIChE J，65：230–238，2019