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Grafting of hydrophilic ethylene glycols or ethylenediamine on coordinatively unsaturated metal sites in MIL-100(Cr) for improved water adsorption characteristics

 
: Wickenheisser, M.; Jeremias, F.; Henninger, S.K.; Janiak, C.

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Inorganica Chimica Acta 407 (2013), pp.145-152
ISSN: 0020-1693
English
Journal Article
Fraunhofer ISE ()
Thermische Anlagen und Gebäudetechnik; Energieeffiziente Gebäude; Speichertechnologien; Energieeffiziente Gebäude und Gebäudetechnik; Elektrische und thermische Wärmepumpen; Kühlung und Klimatisierung von Gebäuden; Wärme- und Kältespeicher; Energieeffiziente und solare Kühlung; framework; grafting; glycols; ethylenediamine; adsorption

Abstract
Grafting of activated MIL-100(Cr) with EG (ethylene glycol), DEG (diethylene glycol), TEG (triethylene glycol) and EN (ethylenediamine) leads to a decrease of the BET surface area and pore volume. Yet, water adsorption isotherms of the modified compounds MIL-100(Cr)-EG, MIL-100(Cr)-DEG and MIL-100(Cr)-EN show a favored uptake of water at lower partial pressures and no loss of total water uptake capacity compared to non-modified MIL-100(Cr). The reduction in surface area is offset by an increased hydrophilicity and an advantageous smaller pore size for the adsorption of water. MIL-100(Cr) is therefore very promising as a water sorption material, e.g., for heat-transformation applications.

: http://publica.fraunhofer.de/documents/N-264364.html