The Role of Water during CO2 Adsorption by Ca-Based Sorbents at High Temperature

Reactions of CaO, MgO, and decarbonated dolomite (CaOMgO) with CO2 and added water have been studied with the goal of understanding fundamental issues related to these materials’ performance as CO2 sorbents. We used a fixed bed reactor, in situ XRD, and DRIFTS to monitor the extent and kinetics of carbonation, surface reactions, and performance loss during repetitive adsorption–desorption cycles at industrial relevant conditions. From reactor and in situ XRD experiments, we found that water is essential to reach high carbonation levels (solid conversion >40%) of CaO and CaOMgO, which is in contrast to a situation where only a small fraction (