Metals (Mg, Sr and Al) modified CaO based sorbent for CO2 sorption/desorption stability in fixed bed reactor for high temperature application

摘要

Modified sorbents - produced by adding compounds of Mg2+, Sr2+ and Al3+ to calcium oxide - have been tested in terms of their CO2 sorption/desorption performance in a fixed bed reactor at high temperatures. In particular this study focuses on the stability of the sorbents as well as the sorption capacity, both of which are important factors when selecting sorbents. X-ray diffraction (XRD) and scanning electron microscope (SEM), coupled with energy dispersive X-ray spectroscopy (EDX), were used for characterization of the modified sorbents. XRD results indicated that samples produced using the wet mixing process and those produced using the hydration with wet mixing process, contained MgO-CaO, Ca0.2Sr0.80O-CaO and Ca12Al14O33-CaO phases, respectively.