乙烯
乙炔
三元运算
氢键
化学
选择性
吸附
氮气
有机化学
分子
催化作用
计算机科学
程序设计语言
作者
Chenyu Song,Zheng Fang,Ying Liu,Qiwei Yang,Zhiguo Zhang,Qilong Ren,Zongbi Bao
标识
DOI:10.1002/anie.202313855
摘要
Abstract The one‐step purification of ethylene (C 2 H 4 ) from mixtures containing ethane (C 2 H 6 ) and acetylene (C 2 H 2 ) is an industrially important yet challenging process. In this work, we present a site‐engineering strategy aimed at manipulating the spatial distribution of binding sites within a confined pore space. We realized successfully by incorporating nitrogen‐containing heterocycles, such as indole‐5‐carboxylic acid (Ind), benzimidazole‐5‐carboxylic acid (Bzz), and indazole‐5‐carboxylic acid (Izo), into the robust MOF‐808 platform via post‐synthetic modification. The resulting functionalized materials, namely MOF‐808‐Ind, MOF‐808‐Bzz, and MOF‐808‐Izo, demonstrated significantly improved selectivity for C 2 H 2 and C 2 H 6 over C 2 H 4 . MOF‐808‐Bzz with two uniformly distributed nitrogen binding sites gave the optimal geometry for selective ethane trapping through multiple strong C−H⋅⋅⋅N hydrogen bonds, leading to the highest C 2 H 2 /C 2 H 4 and C 2 H 6 /C 2 H 4 combined selectivities among known MOFs. Column breakthrough experiments validated its ability to purify C 2 H 4 from ternary C 2 H 2 /C 2 H 4 /C 2 H 6 mixtures in a single step.
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