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

Salma Benzaria, Ekaterina Mamontova, Yannick Guari, Joulia Larionova, Jérôme Long, Philippe Trens, Fabrice Salles and Jerzy Zajac
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Salma Benzaria: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Ekaterina Mamontova: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Yannick Guari: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Joulia Larionova: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Jérôme Long: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Philippe Trens: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Fabrice Salles: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France
Jerzy Zajac: Institut Charles Gerhardt (ICGM), Univ Montpellier, CNRS, ENSCM, 34090 Montpellier, France

Energies, 2021, vol. 14, issue 12, 1-18

Abstract: In view of potential uses in short-term thermochemical heat storage by sorption of water vapor, the capacity to release a sufficient heat amount at the appropriate rate of a Prussian blue analogue (PBA) containing hexacyanocobaltate vacancies has been compared with those of 13X type zeolites possessing Na + , Ce 3+ , Ce 4+ , or Tb 3+ extra-framework compensating cations. The extended structural and surface characterization demonstrated good reproducibility of the preparation procedures performed on a 10-g scale. The adsorbents were tested under dynamic conditions of gas flow with the aid of either a gas flow calorimeter (120 mL h ?1 helium flow) to measure the amount and rate of the integral heat release or a laboratory-scale test rig (15,000 to 22,800 mL h ?1 nitrogen flow) to monitor the outlet temperature of nitrogen heated by adsorption. For a regeneration temperature of 353 K and a partial H 2 O pressure of 2.8 kPa in helium, the PBA sample yielded an integral heat ranging between 900 and 1020 kJ kg ?1 with a very slow heat release lasting for even 12–14 h. The zeolite-based materials generated between 350 and 950 kJ kg ?1 more rapidly (up to 6–7 h), depending on the nature and the content of compensating cations, as well as on the dehydration state achieved during regeneration. With the laboratory-scale test rig, the efficiency of heat extraction by convection was about 65% for Na-13X and only 38% for PBA, and it diminished with decreasing flow rate.

Keywords: short-term thermochemical heat storage; water vapor adsorption; porous adsorbents; cation-exchanged zeolites; Prussian blue analogues; integral heat of adsorption; heat release kinetics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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