The Behavior of Flexible MIL-53(Al) upon CH4 and CO2 Adsorption
The Behavior of Flexible MIL-53(Al) upon CH4 and CO2 Adsorption
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DOI：
10.1021/jp108710h
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发表时间：
2010-12-23
影响因子：
3.7
通讯作者：
Fuchs, Alain H.
中科院分区：
文献类型：
--
作者：
Boutin, Anne;Coudert, Francois-Xavier;Fuchs, Alain H.
渗透热力学模型的使用，结合了一系列不同温度下的甲烷和二氧化碳气体吸附实验，使得人们能够对柔性MIL-53(Al)金属-有机骨架的迷人相行为给予一些新的了解。导出了一般的温度加载相图；结果表明，MIL-53中的呼吸效应是一种非常普遍的现象，应该在有限的温度范围内观察到，而与客体分子无关。此外，先前提出的MIL-53结构转变的应力模型被证明是可以从氙气吸附转移到甲烷吸附的。应力模型还提供了一个理论框架，用于在接近呼吸转变压力的压力下理解LP/NP相混合物的存在，而不必调用多孔样品中吸附物质的不均匀分布。
The use of the osmotic thermodynamic model, combined with a series of methane and carbon dioxide gas adsorption experiments at various temperatures, has allowed shedding some new light on the fascinating phase behavior of flexible MIL-53(Al) metal-organic frameworks. A generic temperature-loading phase diagram has been derived; it is shown that the breathing effect in MIL-53 is a very general phenomenon, which should be observed in a limited temperature range regardless of the guest molecule. In addition, the previously proposed stress model for the structural transitions of MIL-53 is shown to be transferable from xenon to methane adsorption. The stress model also provides a theoretical framework for understanding the existence of lp/np phase mixtures at pressures close to the breathing transition pressure, without having to invoke an inhomogeneous distribution of the adsorbate in the porous sample.