Hydrophilicity tuning and shaping of mofs for water sorption in heat transformation applications
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JANIAK, Christoph. Hydrophilicity tuning and shaping of mofs for water sorption in heat transformation applications. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 20. ISBN 978-9975-62-428-2.
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Achievements and perspectives of modern chemistry 2019
Conferința "International Conference "Achievements and perspectives of modern chemistry""
Chişinău, Moldova, 9-11 octombrie 2019

Hydrophilicity tuning and shaping of mofs for water sorption in heat transformation applications


Pag. 20-20

Janiak Christoph
 
Institut für Anorganische Chemie
 
 
Disponibil în IBN: 30 octombrie 2019


Rezumat

Water-stable MOFs with suitable water uptake capacity are gaining attention for reversible cycling water sorption in order to achieve low temperature heat transformation applications in adsorption heat pumps (AHPs), following our first report [1]. AHPs may be alternatives or supplements to conventional compression systems operating with high input of electricity. By using low grade heat as the driving energy, AHPs can significantly help to minimize electricity consumption. AHPs are based on the evaporation and consecutive adsorption of coolant liquids, preferably water (Figure 1a). The process is driven and controlled by the microporosity and hydrophilicity. Yet, the specific temperature boundaries for evaporation, desorption, heat rejection temperature from the adsorbent and the condenser for a desired cycling water sorption application necessitate the tailoring of the adsorbent in terms of hydrophilicity/hydrophobicity for optimized working conditions, which we have addressed here with a mixed-linker concept of MOF-160/CAU-10-H (Figure 1b) [2]. Further, for applications of MOFs one of the biggest current issues is to find effective methods to shape these microcrystalline, powdery materials into manageable forms such as monoliths, pellets or surface coatings with sufficient mechanical and chemical stability, maximal bulk density etc. under preservation of the crucial MOF porosity properties. We have approached this task successfully with MOF@polymer in different binder composites under retention of MOF porosity and hydrophilicity (Figure 1c,d) [3].