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Programming MOFs for water sorption: Amino-functionalized MIL-125 and UiO-66 for heat transformation and heat storage applications

: Jeremias, F.; Lozan, V.; Henninger, S.K.; Janiak, C.


Dalton transactions 42 (2013), No.45, pp.15967-15973
ISSN: 1477-9226
ISSN: 2209-2386
ISSN: 1477-9234
Journal Article
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; Energieeffiziente Gebäude; Speichertechnologien; Energieeffiziente Gebäude und Gebäudetechnik; Elektrische und thermische Wärmepumpen; Kühlung und Klimatisierung von Gebäuden; Speicher für die Niedertemperatur-Solarthermie; Energieeffiziente und solare Kühlung; framework; pump; stability; sorption

Sorption-based heat transformation and storage appliances are very promising for utilizing solar heat and waste heat in cooling or heating applications. The economic and ecological efficiency of sorption-based heat transformation depends on the availability of suitable hydrophilic and hydrothermally stable sorption materials. We investigated the feasibility of using the metal–organic frameworks UiO-66(Zr), UiO-67(Zr), H2N-UiO-66(Zr) and H2N-MIL-125(Ti) as sorption materials in heat transformations by means of volumetric water adsorption measurements, determination of the heat of adsorption and a 40-cycle ad/desorption stress test. The amino-modified compounds H2N-UiO-66 and H2N-MIL-125 feature high heat of adsorption (89.5 and 56.0 kJ mol−1, respectively) and a very promising H2O adsorption isotherm due to their enhanced hydrophilicity. For H2N-MIL-125 the very steep rise of the H2O adsorption isotherm in the 0.1 < p/p0 < 0.2 region is especially beneficial for the intended heat pump application.