Adsorptive separation of acetylene (C2H2) from carbon dioxide (CO2) promises a practical way to produce high-purity C2H2 required for industrial applications. However, challenges exist in the pore environment engineering of porous materials to recognize two molecules due to their similar molecular sizes and physical properties. Herein, we report a strategy to optimize pore environments of multivariate metal-organic frameworks (MOFs) for efficient C2H2/CO2 separation by tuning metal components, functionalized linkers and terminal ligands. The optimized material UPC-200(Al)-F-BIM, constructed from Al3+ clusters, fluorine-functionalized organic linkers, and benzimidazole terminal ligands, demonstrated the highest separation efficiency (C2H2/CO2 uptake ratio of 2.6), and highest C2H2 productivity among UPC-200 systems. Experimental and computational studies revealed the contribution of small pore size and polar functional groups on the C2H2/CO2 selectivity and indicated the practical C2H2/CO2 separation of UPC-200(Al)-F-BIM.

中文翻译：

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优化多元金属-有机框架以实现高效的 C2H2/CO2 分离

乙炔 (C2H2) 与二氧化碳 (CO2) 的吸附分离有望成为生产工业应用所需的高纯度 C2H2 的实用方法。然而，由于两种分子的分子大小和物理性质相似，多孔材料的孔隙环境工程在识别两种分子方面存在挑战。在此，我们报告了一种策略，通过调整金属组分、功能化接头和末端配体来优化多元金属有机框架 (MOF) 的孔隙环境，以实现高效的 C2H2/CO2 分离。优化的材料 UPC-200(Al)-F-BIM，由 Al3+ 簇、氟官能化的有机连接体和苯并咪唑末端配体构成，表现出最高的分离效率（C2H2/CO2 吸收比为 2.6）和最高的 C2H2 生产率。 UPC-200 系统。