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Multi‐Molar Absorption of CO2 by the Activation of Carboxylate Groups in Amino Acid Ionic Liquids |
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| Authors: | Feng‐Feng Chen Dr Kuan Huang Yan Zhou Dr Zi‐Qi Tian Dr Xiang Zhu Prof Dr Duan‐Jian Tao Prof Dr De‐en Jiang Prof Dr Sheng Dai |
| Institution: | 1. College of Chemistry and Chemical Engineering, Jiangxi Inorganic Membrane Materials Engineering Research Centre, Jiangxi Normal University, Nanchang, China;2. Department of Chemistry, University of Tennessee, Knoxville, TN, USA;3. Department of Chemistry, University of California, Riverside, CA, USA;4. Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA |
| Abstract: | A new strategy for multi‐molar absorption of CO2 is reported based on activating a carboxylate group in amino acid ionic liquids. It was illustrated that introducing an electron‐withdrawing site to amino acid anions could reduce the negative inductive effect of the amino group while simultaneously activating the carboxylate group to interact with CO2 very efficiently. An extremely high absorption capacity of CO2 (up to 1.69 mol mol?1) in aminopolycarboxylate‐based amino acid ionic liquids was thus achieved. The evidence of spectroscopic investigations and quantum‐chemical calculations confirmed the interactions between two kinds of sites in the anion and CO2 that resulted in superior CO2 capacities. |
| Keywords: | amino acids carboxylate group activation CO2 capture ionic liquids multiple site interactions |