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用于二氧化碳捕集的1,8-二氮杂双环(5.4.0)十一碳-7-烯-羟基离子液体的表征

Characterization of 1,8-diazabicyclo(5.4.0)undec-7-ene-hydroxyl-based ionic liquid for CO capture.

作者信息

Amat Syarafana O, Yunus Normawati M, Wilfred Cecilia D

机构信息

Fundamental and Applied Sciences Department, Centre of Ionic Liquids, Universiti Teknologi PETRONAS, Seri Iskandar, Perak Darul Ridzuan 32610, Malaysia.

出版信息

R Soc Open Sci. 2025 Jan 8;12(1):240584. doi: 10.1098/rsos.240584. eCollection 2025 Jan.

DOI:10.1098/rsos.240584
PMID:39780976
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11707546/
Abstract

Six 1,8-diazabicyclo(5.4.0)undec-7-ene-based ionic liquids (ILs) linked with ethyl or propyl hydroxyl cations, coupled with thiocyanate, dicyanamide and bistriflimide anions, were synthesized through a two-step reaction: quaternization and ion exchange. The characterization of the ILs was carried out using H and C nuclear magnetic resonance spectroscopy (NMR) and Fourier-transform infrared spectroscopy (FTIR). The NMR results confirmed the structures of all the ILs, and these were supported by the FTIR results. In addition, the physicochemical properties, namely thermal stability, density and refractive index, were determined. The effects of the chain length in the cation and the identity of the anion on CO absorption were studied in a pressure drop equipment at different pressures. It was found that CO sorption increased with increasing pressure and the number of nitrile groups present. The highest CO sorption is reported to be 0.96 mol CO mol IL at 20 bar.

摘要

通过两步反应（季铵化和离子交换）合成了六种与乙基或丙基羟基阳离子相连，并与硫氰酸盐、双氰胺和双三氟甲磺酰亚胺阴离子结合的1,8 - 二氮杂双环(5.4.0)十一碳 - 7 - 烯基离子液体（ILs）。使用氢和碳核磁共振光谱（NMR）以及傅里叶变换红外光谱（FTIR）对离子液体进行了表征。核磁共振结果证实了所有离子液体的结构，傅里叶变换红外光谱结果也支持了这些结构。此外，还测定了热稳定性、密度和折射率等物理化学性质。在不同压力下的压降设备中研究了阳离子链长和阴离子种类对一氧化碳吸收的影响。结果发现，一氧化碳吸附量随压力和腈基数量的增加而增加。据报道，在20巴时，一氧化碳的最高吸附量为0.96摩尔一氧化碳/摩尔离子液体。

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