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Structural Dependence and Spectroscopic Evidence of Methane Dissolution in Ionic Liquids
Tingyu Huang1,2, Peifang Yan1, Zhanwei Xu1
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy , Dalian Institute of Chemical Physics, Chinese Academy of Science , 457 Zhongshan Road , Dalian 116023 , China.
The Journal of Physical Chemistry. B
|May 1, 2018
Summary
Ionic liquids (ILs) with low surface tension and molar density enhance methane dissolution. Adding trimethyl-1-propanaminium iodide to [Bmim][NTf2] boosted methane solubility by 39.3%, demonstrating ILs
Area of Science:
- Physical Chemistry
- Materials Science
Background:
- High methane dissolution capacity is crucial for methane storage and conversion.
- Ionic liquids (ILs) offer tunable properties for gas solubility applications.
Purpose of the Study:
- To investigate methane solubility in various ionic liquids.
- To correlate methane solubility with IL structural and physical properties.
Main Methods:
- Experimental measurement of methane solubility in different ILs.
- Spectroscopic analysis (in situ high-pressure ATR-FTIR) to study methane-IL interactions.
- Kinetic analysis of methane dissolution at varying temperatures.
Main Results:
- Imidazolium-based ILs with C-F bonds and long alkyl chains exhibited higher methane solubility.
- Reducing surface tension of [Bmim][NTf2] by adding trimethyl-1-propanaminium iodide increased methane solubility by 39.3%.
- Spectroscopic data revealed reversible methane dissolution with altered rotational-vibrational properties and reduced molecular symmetry.
Conclusions:
- Methane solubility in ILs is strongly linked to their physical properties like surface tension and molar density.
- Methane dissolution is a reversible, weakly endothermic process requiring activation energy, influenced by IL cation-anion interactions.
- Tailoring IL structure, such as reducing surface tension, can significantly enhance methane dissolution capacity.
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