Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 55, Issue 25, Pages 7166-7170Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201602919
Keywords
amino acids; carboxylate group activation; CO2 capture; ionic liquids; multiple site interactions
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Funding
- National Natural Science Foundation of China [21206063, 21566011, 31570560]
- Natural Science Foundation of Jiangxi Province [20151BAB213016]
- Jiangxi Normal University Sponsored Program for Distinguished Young Scholars
- China Scholarship Council (CSC)
- U.S. Department of Energy, Basic Energy Sciences
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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.
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