Enhancing Size-Selective Adsorption of CO2/CH4 on ETS-4 via Ion-Exchange Coupled with Thermal Treatment,Industrial & Engineering Chemistry Research

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Enhancing Size-Selective Adsorption of CO2/CH4 on ETS-4 via Ion-Exchange Coupled with Thermal Treatment
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-06-02 , DOI: 10.1021/acs.iecr.3c01079
Qilong Peng ₁ , Yu Chen ₁ , Diyi Fang ₁ , Chuanlei Liu ₁ , Kongguo Wu ₁ , Yuxiang Chen ₁ , Hao Jiang ₁ , Yuanyuan Sun ₁ , Qiumin Wu _{1,

2} , Di Wu _{3,

4,

5,

6} , Hui Sun _{1,

2}

Affiliation

ETS-4 shows great potential to achieve effective separation of challenging mixtures due to its promising tunability of pores. However, the regulation of pore size is largely limited by its low thermal stability. Here, Na-ETS-4 was synthesized by the hydrothermal method and additionally modified via ion exchange coupled with thermal treatment. Structures of all synthesized samples were examined using a variety of characterization techniques. Both adsorption equilibrium and kinetics of CO₂ and CH₄ on these adsorbents were evaluated on custom-made adsorption units. In addition, the mechanism of CO₂ adsorption on different structural models of ETS-4 was revealed via combining with the molecular dynamics (MD) simulations. Ion exchange largely improves the thermal stability of ETS-4 and its adsorption capacities for CO₂ and CH₄. Ba-ETS-4-350 exhibits the largest equilibrium selectivity of 12.42 and the greatest Henry’s selectivity of 2178.51. The radial distribution function (RDF) results reveal the main adsorption sites of CO₂ in different ETS-4 structures.

中文翻译：

通过离子交换结合热处理增强 CO2/CH4 在 ETS-4 上的尺寸选择性吸附

由于 ETS-4 具有良好的孔隙可调性，ETS-4 显示出实现挑战性混合物有效分离的巨大潜力。然而，孔径的调节在很大程度上受到其低热稳定性的限制。在这里，Na-ETS-4 通过水热法合成，并通过离子交换和热处理进行额外改性。使用各种表征技术检查所有合成样品的结构。CO ₂和CH ₄在这些吸附剂上的吸附平衡和动力学在定制的吸附装置上进行了评估。_{此外，CO 2}的机理通过结合分子动力学 (MD) 模拟揭示了对 ETS-4 不同结构模型的吸附。离子交换大大提高了ETS-4的热稳定性及其对CO ₂和CH ₄的吸附能力。Ba-ETS-4-350 表现出最大的平衡选择性 12.42 和最大的亨利选择性 2178.51。_{径向分布函数（RDF）结果揭示了CO 2}在不同ETS-4结构中的主要吸附位点。

更新日期：2023-06-02

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