The efficient separation of ethylene (C2H4) from ethane/ethylene (C2H6/C2H4) mixtures, achieved via a single-step selective adsorption process, represents a promising yet challenging goal. Notably, the pursuit of adsorbents that combine high adsorption capacity with low adsorption heat is paramount, as these attributes directly correlate with superior separation efficiency and minimized regeneration energy. In this study, we present the selective adsorption of C2H6 over C2H4 by a V-MOF (V-TBAPy), constructed from [V(μ2-O)O4]n secondary building units. The pore surface of V-TBAPy is characterized by a high density of aromatic rings and oxygen atoms, which facilitates targeted adsorption of C2H6 through C-H···π and C-H···O interactions. V-TBAPy adsorbs up to 102.6 cm3/g of C2H6 at 298 K and 1 bar, with a selectivity of 1.66 for an equimolar C2H6/C2H4 binary mixture. Importantly, the adsorption heat for C2H6 on V-TBAPy is as low as 22.7 kJ/mol, enabling energy-efficient regeneration. Breakthrough experiments have confirmed the efficacy of V-TBAPy in achieving one-step purification of C2H6/C2H4 mixtures in conditions mimicking industrial settings.

中文翻译：

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通过稳定的钒基金属有机框架从乙烷/乙烯混合物中一步纯化乙烯


通过一步选择性吸附工艺实现乙烯 （C2H4） 与乙烷/乙烯 （C2H6/C2H4） 混合物的高效分离，是一个有前途但具有挑战性的目标。值得注意的是，追求将高吸附容量与低吸附热相结合的吸附剂至关重要，因为这些属性与卓越的分离效率和最低的再生能量直接相关。在这项研究中，我们提出了由 [V（μ2-O）O4]n 次级建筑单元构建的 V-MOF （V-TBAPy） 对 C2H6 对 C2H4 的选择性吸附。V-TBAPy 的孔表面具有高密度的芳香环和氧原子，有利于 C2H6 通过 C-H···π 和 C-H···O 交互。V-TBAPy 在 298 K 和 1 bar 下可吸附高达 102.6 cm3/g 的 C2H6，对等摩尔 C2H6/C2H4 二元混合物的选择性为 1.66。重要的是，C2H6 在 V-TBAPy 上的吸附热低至 22.7 kJ/mol，可实现节能再生。突破性实验证实了 V-TBAPy 在模拟工业环境的条件下实现 C2H6/C2H4 混合物一步纯化的功效。