封面图片
2016年, 第10卷 第1期
(Nadeen Al-Janabi, Abdullatif Alfutimie, Flor R. Siperstein, Xiaolei Fan, pp. 103-107)
Metal-organic frameworks (MOFs), as versatile and promising adsorbents, have attracted much attention for gas adsorption and separation due to their high adsorption capacity and tuneable structural/chemical properties. Coordinatively unsaturated divalent metal cations (or open metal sites, OMSs) in certain MOFs, e.g. unsaturated copper centres in Cu3(BTC)2 MOF, have been recognised as the attractive feature for gas adsorption. These OMSs render an exceptionally high surface density (e.g. ~3 OMSs per 100 A) leading to particularly high affinity to polar molecules such as water. Therefore, understanding the hydrothermal stability of MOFs with OMSs under appropriate conditions is necessary to enhance the uptake of MOFs for practical applications, e.g. the CO2 capture from flue gases where ca. 7% H2O is present. Here, a case study of water vapour adsorption on Cu3(BTC)2 MOF is conducted revealing its deformation dynamics under humid conditions. Comprehensive post-adsorption characterisation of materials provides evidence, for the first time, for the underlying mechanism of how the water vapour degrades MOFs with OMSs. The result of this research is crucial to guide the ultimate design of future MOFs with superior hydrothermal stability, while maintaining the properties of interest.
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ISSN 2095-0179 (Print)
ISSN 2095-0187 (Online)
CN 11-5981/TQ
Postal Subscription Code 80-969 Formerly Known as Frontiers of Chemical Science and Engineering in China 2018 Impact Factor: 2.809