Water sorption studies on ZnSO4‐zeolite composite as potential thermochemical heat storage materials

Summary ZnSO4·7H2O is modified by impregnation method with zeolite matrices (13X‐zeolite and LTA‐zeolite) to improve its hydration performance. Water sorption ability of composites was carried out in a constant temperature and humidity environment. Composite of ZnSO4/13X‐zeolite showed highest water...

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Bibliographic Details
Published inInternational journal of energy research Vol. 44; no. 1; pp. 269 - 281
Main Authors Ur Rehman, Ata, Maosheng, Zheng, Hayat, Asif
Format Journal Article
LanguageEnglish
Published Bognor Regis Hindawi Limited 01.01.2020
Subjects
Adsorption
Air temperature
Composite materials
composites
Enthalpy
Heat storage
heat storage material
Humidity
Hydration
Relative humidity
Sorption
thermochemical heat storage
Zeolites
Zinc sulfate
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Summary:Summary ZnSO4·7H2O is modified by impregnation method with zeolite matrices (13X‐zeolite and LTA‐zeolite) to improve its hydration performance. Water sorption ability of composites was carried out in a constant temperature and humidity environment. Composite of ZnSO4/13X‐zeolite showed highest water sorption (0.26 g/g) at 75% relative humidity under 45°C air temperature, which is double than pure ZnSO4·7H2O. This is due to larger surface area (491 m2 g‐1) and pore volume (0.31 cm3). Furthermore, both hydration rate and adsorption mass depends on relative humidity and hydration temperature. However, if the air temperature and the relative humidity are higher than 45°C and 75% RH, the hydration ability of the composite material is significantly reduced. Besides, X‐ray measurements of composite (ZnSO4/13X) revealed that sorption/desorption process, crystallinity and phase of partially hydrated ZnSO4 remain the same, which enhance the adsorption mass and enthalpy during the hydration process.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.4910