选择性
渗透
化学
吸附
膜
吸附
选择性吸附
扩散
化学工程
物理化学
有机化学
热力学
催化作用
生物化学
物理
工程类
作者
Helge Bux,Christian Chmelik,Rajamani Krishna,Juergen Caro
标识
DOI:10.1016/j.memsci.2010.12.001
摘要
The newly developed MOF membrane ZIF-8 separates an equimolar ethene/ethane mixture at room temperature for 1 and 6 bar feed pressure, respectively, with a selectivity of 2.8 and 2.4. Independent sorption uptake studies of an ethene/ethane mixture on a big ZIF-8 single crystal by IR microscopy detection show in combination with grand canonical Monte Carlo simulations that this moderate ethene selectivity of the ZIF-8 membrane can be explained by the interplay of a preferential ethane adsorption selectivity competing with a preferential ethene diffusion selectivity. This means, that ethane adsorbs stronger than ethene, but ethene diffuses faster and overcompensates the adsorption preference of ethane, resulting in a membrane permeation selectivity for ethene.
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