Kinetics of Ca(OH)₂ decomposition in pure Ca(OH)₂ and Ca(OH)₂-CaTiO₃ composite pellets for application in thermochemical energy storage system

Thermochemical energy storage based on dehydration-hydration of Ca(OH)₂/CaO reversible gas solid reaction offers an important way of understanding energy storage/release rates of energy storage system. The aim of study is to achieve better understanding of kinetics of Ca(OH)₂ decomposition under isothermal conditions and to enhance reaction rate by addition of inert agent. Thermogravimetric analyzer was used to perform kinetic analysis of pure Ca(OH)₂ decomposition at various temperatures, yielding kinetic parameters - activation energy and Arrhenius constant with derived rate control equations for isothermal and non-isothermal conditions. CaTiO₃ is added to Ca(OH)₂ at different compositions to enhance kinetic parameters in form of composite pellets which showed significant increase in activation energy and Arrhenius constant values. Addition of CaTiO₃ assisted in increasing reaction rate likely by increasing reaction surface area. Composite pellets showed promising results to get new advanced hydroxide-based material however further study on cyclic stability of the material is needed.