Presentation Information
[7p-N406-9]In-situ FTIR Measurements and Estimation of Reaction Kinetics in the Hydration Reaction of Thermochemical Heat Storage Materials
〇Kunihiko Shizume1 (1.Nagoya Inst. of Tech)
Keywords:
Reaction Kinetics,Chemical Heat Storage,High-throughput Evaluation
Thermochemical heat storage using hydration/dehydration reactions of inorganic salts is a promising technology for effectively utilizing low-grade waste heat below 250 degC. Among various systems, inorganic salt/H2O materials have attracted significant attention due to their safety and cost-effectiveness. However, in low-temperature regimes, hydration reactions are often kinetically slow, limiting the range of usable materials. Although virtual screening using crystallographic databases has recently facilitated material discovery, the prediction of hydration kinetics remains challenging and still requires experimental validation. In this study, we aim to establish an in-situ optical evaluation method using micro-FTIR and micro-Raman spectroscopy to estimate hydration reaction rates with high spatial resolution. A humidity- and temperature-controllable chamber for optical microscopy was developed to observe the hydration process under controlled conditions. The hydration kinetics of CaSO4.0.5H2O was studied as a model system, and reaction rates were evaluated via statistical analysis of time-resolved spectral changes.