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

 
: Wöllner, Michelle; Klein, Nicole; Kaskel, Stefan

:

Microporous and mesoporous materials 278 (2019), S.206-211
ISSN: 1387-1811
Englisch
Zeitschriftenaufsatz
Fraunhofer IWS ()
metal-organic framework; water adsorption; adsorption heat pump; optical calorimetry; InfraSORP

Abstract
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.

: http://publica.fraunhofer.de/dokumente/N-524098.html