A stable Al-MOF based on pore size control strategy for efficient SF6/N2 separation

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-04-01 DOI:10.1016/j.micromeso.2025.113622

Zi-Yue Liu , Jiang-wen Yan , Qianji Han , Jin-Can Zhao , Lei Liu , Ruihan Wang , Shan-Qing Yang , Jian-Long Du

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Abstract

SF₆ has been widely used as an insulating medium, but it can also cause serious greenhouse effect. The efficient separation of SF₆ appears very important and challenging. A stable and scalable synthesis of Al-MOF (MOF-303) is reported in the present work, which possesses an appropriate pore size (6.79 Å) that matches the dynamic diameter of SF₆ molecules (5.2 Å). MOF-303 shows a higher adsorption capacity of SF₆ (49.70 cm³/g) at low pressure (10 kPa) and ambient temperature, and the excellent adsorption selectivity of SF₆/N₂ (10:90) achieves 183.37 at ambient conditions. Meanwhile, breakthrough experiments exhibit that MOF-303 can efficiently separate high purify SF₆ form SF₆/N₂ mixtures at ambient conditions. The relevant experimental conclusions have been further verified by theoretical calculations. The stronger binding energy between MOF-303 and SF₆ molecule should be responsible for the efficient SF₆ adsorption and separation. More importantly, the adsorption capacity of SF₆ by the particle sample has decreased, but it still exhibits excellent gas separation ability. The results will contribute to the design efficient and practical gas separation materials.

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基于孔径控制的稳定Al-MOF高效分离SF6/N2

SF6已被广泛用作绝缘介质，但它也会造成严重的温室效应。SF6的高效分离显得非常重要和具有挑战性。本文报道了一种稳定且可扩展的Al-MOF （MOF-303）的合成方法，该方法具有与SF6分子的动态直径（5.2 Å）相匹配的合适孔径（6.79 Å）。MOF-303在低压（10 kPa）和环境温度下对SF6具有较高的吸附量（49.70 cm3/g），在环境条件下对SF6/N2的吸附选择性（10:90）达到183.37。同时，突破性实验表明MOF-303能够在环境条件下高效地将高纯度SF6从SF6/N2混合物中分离出来。理论计算进一步验证了相关实验结论。MOF-303与SF6分子之间较强的结合能可能是有效吸附和分离SF6的原因。更重要的是，颗粒样品对SF6的吸附能力有所下降，但仍表现出优异的气体分离能力。研究结果将有助于设计高效实用的气体分离材料。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.