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Improving Ethane/Ethylene Separation Performance of Isoreticular Metal–Organic Frameworks via Substituent Engineering
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2021-11-03 , DOI: 10.1021/acsami.1c17818
Ping Zhou 1 , Lianglan Yue 1 , Xinxin Wang 1 , Lihui Fan 1 , De-Li Chen 2 , Yabing He 1
Affiliation  

The preferential capture of ethane (C2H6) over ethylene (C2H4) presents a very cost-effective and energy-saving means applied to adsorptive separation and purification of C2H4 with a high product purity, which is however challenged by low selectivity originating from their similar molecular sizes and physical properties. Substituent engineering has been widely employed for selectivity regulation and improvement, but its effect on C2H6/C2H4 separation has been rarely explored to date. In this work, four isoreticular coordination framework compounds based on 5-(pyridin-3-yl)isophthalate ligands bearing different substituents were rationally constructed. As revealed by isotherm measurements, thermodynamic studies, and IAST computations, they exhibited promising utility for C2H6/C2H4 separation with moderate adsorption heat and a high uptake amount at a relatively low-pressure domain. Furthermore, the C2H6/C2H4 separation potential can be finely tuned and optimized via purposeful substituent alteration. Most remarkably, functionalization with a nonpolar methyl group yielded an improved separation efficiency compared to its parent compound. This work offers a good reference value for enhancing the C2H6/C2H4 separation efficiency of MOFs by engineering the pore microenvironment and dimensions via substituent manipulation.

中文翻译:

通过取代基工程改善等网状金属-有机骨架的乙烷/乙烯分离性能

乙烷 (C 2 H 6 ) 优于乙烯 (C 2 H 4 )的优先捕获是一种非常经济高效且节能的方法,适用于具有高产品纯度的 C 2 H 4 的吸附分离和纯化,然而由于它们相似的分子大小和物理性质而受到低选择性的挑战。取代基工程已被广泛用于选择性调节和改进,但其对 C 2 H 6 /C 2 H 4 的影响迄今为止,人们很少探讨分离问题。在这项工作中,合理地构建了四种基于具有不同取代基的 5-(pyridin-3-yl)isophthalate 配体的等网状配位骨架化合物。正如等温线测量、热力学研究和 IAST 计算所揭示的那样,它们在 C 2 H 6 /C 2 H 4分离方面表现出有前途的效用,在相对低压的范围内具有中等吸附热和高吸收量。此外,将C 2 H ^ 6 / C 2 H ^ 4分离势可以精细地调整和优化经由有目的的取代基改变。最显着的是,与母体化合物相比,用非极性甲基官能化可提高分离效率。该工作通过取代基操作设计孔隙微环境和尺寸为提高MOFs的C 2 H 6 /C 2 H 4分离效率提供了良好的参考价值。
更新日期:2021-11-17
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