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具有高连接性的3D共价有机框架与pdp网用于高效的C₂H₂/CO₂分离

Jie Zhang¹, Haorui Zheng¹, Fengqian Chen¹

¹State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Department of Chemistry, Jilin University, Changchun, 130012, P. R. China.

Angewandte Chemie (International ed. in English)

|February 18, 2025

概括

合成了两个具有独特的新的3D共价有机框架 (COF). 这些先进的COF显示出异常能力,可以将乙与二氧化碳分离,即使在潮湿的条件下.

科学领域:

材料科学材料科学材料科学
化学化学化学

背景情况:

由于其复杂的结构和稳定性,高连接性3D共价有机框架 (COF) 对各种应用具有前景.
使用混合高节点构造单元合成3DCOF在材料化学中提出了重大挑战.

研究的目的:

从混合高节点建筑单元合成的 JUC-661 和 JUC-662 引入新的 3D COF.
研究这些新型COF的气体分离能力,特别是乙/二氧化碳混合物.

主要方法:

使用D2h对称的8节点和D3h对称的6节点构建块合成了两种新的3DCOF (JUC-661和JUC-662).
描述COF的结构,包括前所未有的 [8+6]-c pdp网和半孔多面体.
在各种湿度条件下使用动态突破实验评估气体吸附和分离性能.
使用蒙特卡洛模拟和DFT计算进行计算分析,以了解吸附机制.

主要成果:

成功合成了JUC-661和JUC-662,其中包括罕见的半孔多面体 (~3.9 nm).
对于C2H2/CO2混合物 (4.3对于JUC-661,5.9对于JUC-662) 的显著吸附选择性.
在100%的湿度条件下保持高分离性能.
计算研究显示,孔腔结构和化效应增强了C2H2的选择性.

结论:

这项研究扩大了3D共价有机框架的结构多样性.
JUC-661和JUC-662显示了节能气体分离工艺的巨大潜力.
建筑单元的化可以作为一种提高COF选择性吸附的策略.

关键词:

在C2H2/CO2分离过程中.共价有机框架是共价有机框架.有孔的材料是多孔的材料.网状化学网状化学

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