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<p>CO<sub>2</sub> is one of the main contributors to the greenhouse effect, and the separation of CO<sub>2</sub> from flue gas has become a focus of research. Functionalized ionic liquids (ILs) incorporated into solid adsorbents offer dual benefits as carriers and ILs, effectively addressing the challenges associated with the high viscosity of ILs and amine leaching. In this study, mesoporous KIT-6 serves as the carrier, while tetraethylenepentamine nitrate ([TEPA][NO<sub>3</sub>]) and tetraethylenepentamine lysine ([TEPA][Lys]) function as modifiers, resulting in two distinct adsorption materials designated K6PX and K6LX. The impact of varying IL loadings (10 wt%–70 wt%) and temperature on CO<sub>2</sub> adsorption performance was systematically investigated. Under mixed gas conditions comprising N<sub>2</sub>/CO<sub>2</sub> (85/15 vol%) at 60&#xa0;°C, K6P60% exhibited a maximum CO<sub>2</sub> adsorption capacity of 3.13&#xa0;mmol·g<sup>−1</sup>, while K6L65% reached 2.77&#xa0;mmol·g<sup>−1</sup>. Notably, after five cycles of adsorption–desorption testing, K6P60% maintained an impressive adsorption capacity of 2.71&#xa0;mmol·g<sup>−1</sup>, demonstrating excellent cycling stability.</p> Graphical abstract <p></p>

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Preparation and CO2 adsorption of amino proton type ionic liquid @ KIT-6 composite material

  • 期刊论文

  • 发表日期：

    2025年2月18日

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  • Dijun Zhou,
  • Jianwen Wei,
  • Lin Ge,
  • Linlin Geng,
  • Xiaobin Zhou,
  • Lei Liao

摘要

CO2 is one of the main contributors to the greenhouse effect, and the separation of CO2 from flue gas has become a focus of research. Functionalized ionic liquids (ILs) incorporated into solid adsorbents offer dual benefits as carriers and ILs, effectively addressing the challenges associated with the high viscosity of ILs and amine leaching. In this study, mesoporous KIT-6 serves as the carrier, while tetraethylenepentamine nitrate ([TEPA][NO3]) and tetraethylenepentamine lysine ([TEPA][Lys]) function as modifiers, resulting in two distinct adsorption materials designated K6PX and K6LX. The impact of varying IL loadings (10 wt%–70 wt%) and temperature on CO2 adsorption performance was systematically investigated. Under mixed gas conditions comprising N2/CO2 (85/15 vol%) at 60 °C, K6P60% exhibited a maximum CO2 adsorption capacity of 3.13 mmol·g−1, while K6L65% reached 2.77 mmol·g−1. Notably, after five cycles of adsorption–desorption testing, K6P60% maintained an impressive adsorption capacity of 2.71 mmol·g−1, demonstrating excellent cycling stability.

Graphical abstract