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Ion Exchange

Ion Exchange

Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...

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Updated: Jan 9, 2026

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

具有表面Mo─O集群的MFI热带岩膜用于反向CH₄/CO₂分离.

Yongyan Deng¹, Dan Ma¹, Hao Zhang¹

¹Faculty of Chemistry, Northeast Normal University, Changchun, 130024, China.

Angewandte Chemie (International ed. in English)

|November 30, 2025

概括

这项研究引入了一种新型的氧功能化化膜,用于选择性地分离甲 (CH4) 和二氧化碳 (CO2). 这一突破使得从气体混合物中有效地回收甲,推进了生物气和天然气净化.

关键词:

反向气体分离的方法膜膜是一种膜.甲净化方法甲净化方法分子的分子.泽奥莱特石是一种热带石.

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科学领域:

材料科学材料科学材料科学
化学工程是化学工程的重要组成部分.
分离科学分离科学

背景情况:

甲 (CH4) 和二氧化碳 (CO2) 的工业分离对于生物气,垃圾填埋气和天然气利用至关重要.
目前的二氧化碳选择性膜限制了富含甲气体的有效回收,突出了需要CH4选择性的替代品.

研究的目的:

开发和演示一种新的MFI类型的化物膜,其功能与氧 (Mo─O) 集群用于反向CH4 / CO2气体分离.
在二氧化碳上实现甲的选择性透,使得甲的净化和回收.

主要方法:

在基支上制造纯的MFI类型化物膜.
使用浸和化酸来形成Mo─O集群的MFI膜的功能化.
使用CH4 / CO2混合物的气体分离性能评估,测量分离因子和透度.

主要成果:

在Mo─O/MFI膜中,CH4对CO2有选择性的透.
实现了前所未有的11.8.8的CH4 / CO2分离因子.
证明了2.1 × 10^-8mol s^-1 m^-2 Pa^-1. 的高CH4透率.

结论:

具有Mo─O功能的MFI热带膜是第一个可逆CH4/CO2分离的多孔膜.
甲的优先吸附到Mo─O集群上,并通过热带石孔快速扩散,驱动了选择性分离.
这项研究为设计用于气体净化应用的先进CH4选择性膜提供了途径.