CO2 Absorption Mechanism by Ionic liquid Using In-situ Raman and Small-angle X-ray Scattering Measurements

2014 Fiscal Year Final Research Report

• Project/Area Number: 24550009
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Physical chemistry
• Research Institution: Chiba University
• Principal Investigator: TAKESHI Morita 千葉大学, 融合科学研究科(研究院), 准教授 (80332633)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: イオン液体 / 小角X線散乱 / 二酸化炭素吸蔵 / ラマン散乱 / ゆらぎ / チタンセル

Outline of Final Research Achievements

Structural fluctuation of imidazolium-based ionic liquids(ILs) + carbon dioxide systems was evaluated from the microscopic, mesoscopic and macroscopic perspective. Density of the systems was measured by X-ray absorption method and excess molar volume was evaluated to investigate volumetric behaviour under carbon dioxide absorption process up to 20 MPa. A V-shaped density plot was observed, and three types of expanded/compressed trends were classified based on the excess molar volume of the IL. Volumetric behaviour of IL strongly depends on carbon dioxide amount absorbed in IL's cavities.
Pressure dependence of Raman spectra indicates that carbon dioxide is absorbed in ILs physically, and the state of carbon dioxide aggregation absorbed in ILs does not change remarkably even at higher pressure range.

Free Research Field

構造物理化学