465618 Kinetic Analysis of High Temperature Thermochemical Energy Storage Based on Calcination–Carbonation Chemical Looping Reactions
This work details a comparative thermodynamic and kinetic study of calcination and carbonation reactions, using commercial samples and synthesized mixtures of carbonates such as CaCO3 and SrCO3. Experiments are carried out under a CO2 atmosphere using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) and the materials are selected to attain the desired storage temperature (typically above 565°C), energy density and charging and discharging rates. Chemical and structural cyclability of candidate materials are evaluated as a function of the calcination–carbonation cycle number using several characterization techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption and X-ray diffraction crystallography. We show how different mixtures and synthesis precursors can improve the cyclability of metal oxide–carbonate systems.