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Published on: September 6, 2012
Purification of Xe and SF6 through Adaptive Contractions in a Flexible Metal-Organic Framework
Jia Dai1,2, Zhongzhan Wang1,2, Jindou Tian2
1College of Chemistry, Fuzhou University, Fuzhou 350002, P. R. China.
Abstract:
Overcoming the trade-off effects between adsorption capacity, adsorption selectivity, and adsorption enthalpy of an adsorbent is very important but remains a huge challenge. Here, we report a flexible metal-organic framework (FJI-H36); it can selectively adsorb Xe from Xe/Kr mixtures with high adsorption capacity but very low adsorption enthalpy. Structural analyses show that such excellent adsorption performances come from the adaptive contraction of the flexible framework; pore shrinkage can enhance the interactions between adsorbed Xe and the framework and offset some of the adsorption heats. For SF6/N2 mixtures, FJI-H36 can also enhance the adsorption performance of SF6 through adaptive contraction, resulting in both high adsorption selectivity and low adsorption enthalpy. This not only provides a new adsorbent for the purification of Xe/Kr/SF6 but also offers a potential solution to overcome the trade-offs among adsorption capacity, adsorption selectivity, and adsorption enthalpy of a specific adsorbent.
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