Heat Release Kinetics upon Water Vapor Sorption Using Cation-Exchanged Zeolites and Prussian Blue Analogues as Adsorbents: Application to Short-Term Low-Temperature Thermochemical Storage of Energy

In view of potential uses in short-term thermochemical heat storage by sorption water vapor, the capacity to release a sufficient amount at appropriate rate Prussian blue analogue (PBA) containing hexacyanocobaltate vacancies has been compared with those 13X type zeolites possessing Na+, Ce3+, Ce4+, or Tb3+ extra-framework compensating cations. The extended structural and surface characterization demonstrated good reproducibility preparation procedures performed on 10-g scale. adsorbents were tested under dynamic conditions gas flow aid either calorimeter (120 mL h−1 helium flow) measure integral laboratory-scale test rig (15,000 22,800 nitrogen monitor outlet temperature heated adsorption. For regeneration 353 K partial H2O pressure 2.8 kPa helium, PBA sample yielded an ranging between 900 1020 kJ kg−1 very slow lasting for even 12–14 h. zeolite-based materials generated 350 950 more rapidly (up 6–7 h), depending nature content cations, as well dehydration state achieved during regeneration. With rig, efficiency extraction convection was about 65% Na-13X only 38% PBA, it diminished decreasing rate.