The development of ethane (C₂H₆)-selective adsorbents for ethylene (C₂H₄) purification, although challenging, is of prime industrial importance. Pillared-layer metal-organic frameworks (MOFs) possess facilely tunable pore structure and functionality, which means they have excellent potential for high-performance C₂H₆/C₂H₄ separation applications. Herein, we report a family of isostructural pillared-layer MOFs with various metal centers M and co-ligands L, M₂(D-cam)₄L₂ (denoted M-cam-L; M = Cu, Co, Ni; L = pyz, apyz, dabco), with a variety of pore surface properties. All of the M-cam-L materials exhibit preferential adsorption for C₂H₆ over C₂H₄. In particular, Ni-cam-pyz exhibits the highest C₂H₆ capture capacity (68.75 cm³ g⁻¹ at 1 bar and 298 K), Cu-cam-dabco possesses the greatest C₂H₆/C₂H₄ adsorption selectivity (2.3), and the lowest isosteric heat of adsorption is demonstrated for Cu-cam-pyz (20.1 kJ mol⁻¹). Dynamic column breakthrough experiments also confirmed the excellent separation performance of M-cam-pyz and M-cam-dabco materials. The synthesis route of the M-cam-L materials is easily scaled-up under laboratory conditions, and hence this class of MOFs is promising for practical C₂H₄ purification.

中文翻译：

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通过孔隙工程促进可扩展金属有机框架中的 C2H6/C2H4 分离

_{开发用于乙烯 (C 2} H ₄ ) 纯化的乙烷 (C ₂ H ₆ ) 选择性吸附剂虽然具有挑战性，但在工业上具有重要意义。柱状层金属有机骨架（MOFs）具有易于调节的孔结构和功能，这意味着它们在高性能C ₂ H ₆ /C ₂ H ₄分离应用中具有极好的潜力。在此，我们报告了一系列具有不同金属中心 M 和共配体 L、M ₂ (D-cam) ₄ L _{2的等结构柱层 MOF}（记为 M-cam-L；M = Cu、Co、Ni；L = pyz、apyz、dabco），具有多种孔表面特性。所有的M-cam-L材料都表现出对C ₂ H ₆的优先吸附优于C ₂ H ₄。特别是Ni-cam-pyz表现出最高的C ₂ H ₆捕获能力（68.75 cm ³  g ^-1 at 1 bar和298 K），Cu-cam-dabco具有最大的C ₂ H ₆ /C ₂ H ₄吸附选择性 (2.3)，Cu-cam-pyz (20.1 kJ mol ^{-1 ) 的等量吸附热最低}）。动态柱突破实验也证实了 M-cam-pyz 和 M-cam-dabco 材料的出色分离性能。M-cam-L材料的合成路线在实验室条件下很容易放大，因此这类MOFs有望用于实际的C ₂ H ₄纯化。