Premium
Water sorption studies on ZnSO 4 ‐zeolite composite as potential thermochemical heat storage materials
Author(s) -
Ur Rehman Ata,
Maosheng Zheng,
Hayat Asif
Publication year - 2020
Publication title -
international journal of energy research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.808
H-Index - 95
eISSN - 1099-114X
pISSN - 0363-907X
DOI - 10.1002/er.4910
Subject(s) - zeolite , sorption , relative humidity , adsorption , desorption , enthalpy , crystallinity , composite number , humidity , materials science , volume (thermodynamics) , chemical engineering , microporous material , chemistry , composite material , thermodynamics , organic chemistry , catalysis , physics , engineering
Summary ZnSO 4 ·7H 2 O 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 ZnSO 4 /13X‐zeolite showed highest water sorption (0.26 g/g) at 75% relative humidity under 45°C air temperature, which is double than pure ZnSO 4 ·7H 2 O. This is due to larger surface area (491 m 2 g ‐1 ) and pore volume (0.31 cm 3 ). 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 (ZnSO 4 /13X) revealed that sorption/desorption process, crystallinity and phase of partially hydrated ZnSO 4 remain the same, which enhance the adsorption mass and enthalpy during the hydration process.