464380 Adsorption-Based Heating and Cooling – Metal-Organic Frameworks over Zeolites?
Market penetration of AHP/ACs has been only minor up to now. This because AHP/ACs are currently bulkier and less energy-efficient than their electrically operated vapor-compression counterparts. The moderate performance of AHP/ACs can be largely attributed to poor to moderate adsorptive properties of current state-of-the-art materials (mainly zeolites). To improve performance and thus commercialization of AHP/ACs, we have embarked on a quest to find more suitable adsorbent materials. Especially a relatively novel set of materials, the Metal-Organic Frameworks (MOFs), holds great promises for AHP/ACs. MOFs consist of inorganic clusters linked together by organic ligands to create porous crystalline materials. More than 20.000 MOFs are known currently, spanning a large variety of topologies and material properties. Not surprisingly thus, MOFs have received attention for a plethora of applications.
In this work we critically explore the promise that Metal-Organic Frameworks (MOFs) hold for adsorption heating and cooling by means of a critical comparison to commercially available materials, with special reference to zeolites, using either water [1, 2] or alcohols [1, 3] as working fluid. Based on both experimental and theoretical efforts we conclude that:
(i) MOFs that are sufficiently stable towards water [1, 2] exist.
(ii) Of these subset, multiple MOFs show the desired adsorption behaviour with either water or alcohols as working fluid [1, 2, 3].
(iii) These working pairs (MOF-working fluid) show enhanced energy efficiency and working capacity compared to benchmark materials and require a lower driving temperature.
(iv) The optimal working pair for specific operating windows depends on the MOF’s pore structure (adsorption sites and pore size).
(v) MOFs may hold an added benefit for application, as they can be coated (without binder) directly on heat-exchanger surfaces [4, 5].
In short, the future is bright for the application of MOFs in adsorption heat pumps and chillers.
 De Lange, M.F.; Verouden, K.J.F.M.; Vlugt, T.J.H.; Gascon, J.; Kapteijn, F.; Chemical Reviews, 2015, 115, 12205-1250
 Cadiau, A.; Lee, J. S.; Damasceno Borges, D.; Fabry, P.; Devic, T.; Wharmby, M. T.; Martineau, C.; Foucher, D.; Taulelle, F.; Jun, C.-H.; Hwang, Y. K.; Stock, N.; De Lange, M. F.; Kapteijn, F.; Gascon, J.; Maurin, G.; Chang, J.-S.; Serre, C.; Advanced Materials, 2015, 27, 4775-4780.
 De Lange, M.F.; Van Velzen, B.L.; Ottevanger, C.P.; Verouden, K.J.F.M.; Lin, L.-C.; Vlugt, T.J.H.; Gascon, J.; Kapteijn, F.; Langmuir, 2015, 31, 12783-12796
 De Lange, M. F.; Ottevanger, C. P.; Wiegman, M.; Vlugt, T. J. H.; Gascon, J.; Kapteijn, F.; CrystEngComm, 2015, 17, 281-285
 De Lange, M. F.; Zeng, T.; Vlugt, T. J. H.; Gascon, J.; Kapteijn, F.; CrystEngComm, 2015, 17, 5911-5920
See more of this Group/Topical: Separations Division