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柱金属有机框架的拓结构重构,从灵活性到刚性,用于增强的乙烯分离

Hanting Xiong¹, Yong Peng¹, Xing Liu¹

¹School of Chemistry and Chemical Engineering, Nanchang University, Nanchang, Jiangxi, 330031, China.

Advanced materials (Deerfield Beach, Fla.)

|May 11, 2024

概括

研究人员通过转换灵活的金属有机框架 (MOF) 来创建一个刚性金属有机框架. 这种新的MOF显著改善了乙 (C2H2) 的吸附,并使高纯度乙烯 (C2H4) 的分离成为可能.

科学领域:

材料科学材料科学材料科学
化学化学化学
化学工程是化学工程的重要组成部分.

背景情况:

灵活的金属有机框架 (MOF) 在特定压力值以下,难以消除微量杂质.
通过拓重新配置来消除MOF灵活性是具有挑战性的,并且很少在实践中应用.

研究的目的:

通过改变其拓来开发具有增强吸附性能的刚性MOF.
研究结构刚性的对乙 (C2H2) 吸附和C2H2/C2H4混合物的分离的影响.

主要方法:

使用溶剂介导方法将灵活的CuSnF6-dpds-sql (sql拓) 转换为刚性的CuSnF6-dpds-cds (cds拓).
在柔性和刚性MOF中测量了乙烯 (C2H2) 吸附能力和动力学.
运用计算模拟来理解结构变化和客-主互动.
对C2H2/C2H4气体混合物分离进行了动态突破实验.

主要成果:

这种转换在离子柱式MOF中产生了前所未有的cds拓.
刚性CuSnF6-dpds-cds在0.01bar的C2H2吸附能力 (48.61cm3g-1) 增加了2.3倍,与柔性模拟相比.
对C2H2的吸附动力学显著增强,在刚性MOF上扩散时间常数快6.5倍.
动态突破性实验从稀释的C2H2/C2H4混合物中获得了高纯度乙烯 (C2H4>99.996%) 具有高生产率 (93.9 mmol g-1).

结论:

拓重新配置有效地消除了MOF的灵活性,从而带来了优越的吸附性能.
刚性CuSnF6-dpds-cds MOF是有效的乙烯捕获和乙烯净化的一个有前途的材料.
这项工作提出了一个可行的策略,用于设计具有适合气体分离应用的特性的先进MOF材料.

关键词:

吸附吸附是一种吸附.气体净化气体净化金属有机的框架.分离式隔离器的使用方法拓结构重新配置的重构.

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