Measuring water adsorption processes of metal-organic frameworks for heat pump applications via optical calorimetry

被引:19
作者
Woellner, Michelle [1 ,2 ]
Klein, Nicole [1 ]
Kaskel, Stefan [1 ,2 ]
机构
[1] Fraunhofer Inst Mat & Beam Technol, Chem Surface & React Technol, Winterbergstr 28, D-01277 Dresden, Germany
[2] Tech Univ Dresden, Inorgan Chem 1, Bergstr 66, D-01069 Dresden, Germany
关键词
Metal-organic frameworks; Water adsorption; Adsorption heat pump; Optical calorimetry; InfraSORP; ACTIVATED CARBONS; PORE-SIZE; TRANSFORMATION; MOFS; METHANOL; AIR;
D O I
10.1016/j.micromeso.2018.11.024
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Optical calorimetry (broadband IR-detection of the released heat of adsorption, "InfraSORP") during water adsorption processes is used for an accelerated assessment of porous materials performance in heat pump applications. Metal-organic frameworks (MOFs) are screened as a highly promising class of materials for water adsorption driven heat exchangers with high water adsorption capacities. Based on a proper calibration, optical calorimetry is demonstrated to allow for rapid estimation of the total water adsorption capacity at a given relative humidity. In a dynamic mode, full water adsorption isotherms can be measured using a step-wise increase of the relative humidity. As cycling stability is among the most critical issues for the integration of new porous materials into systems, the InfraSORP methodology provides a valuable and inexpensive tool for accelerated cycling and stability testing. The InfraSORP technique is demonstrated to provide a significantly accelerated automated and easy-to-acquire alternative as compared to conventional characterization methods.
引用
收藏
页码:206 / 211
页数:6
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