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2013
Journal Article
Titel
Programming MOFs for water sorption: Amino-functionalized MIL-125 and UiO-66 for heat transformation and heat storage applications
Abstract
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.
Tags
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Thermische Anlagen und Gebäudetechnik
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Energieeffiziente Gebäude
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Speichertechnologien
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Energieeffiziente Gebäude und Gebäudetechnik
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Elektrische und thermische Wärmepumpen
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Kühlung und Klimatisierung von Gebäuden
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Speicher für die Niedertemperatur-Solarthermie
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Energieeffiziente und solare Kühlung
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framework
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pump
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stability
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sorption