Incorporation of CaO into inert supports for enhanced CO2 capture: A review

While CaO has exhibited promising prospects and been identified as one of the best candidates for high-temperature CO2 capture, it suffers a well-known problem of loss-in-capacity; that is, its sorption capacity decays quickly with the increase of cycle numbers. In the last decade, extensive work has been conducted on the incorporation of CaO into inert solid support particles to preventing sintering and, thus, to enhance its cyclic CO2 sorption performance. With the rapid progress in this aspect, a timely review is highly required. This work summarized the state-of-the-art researches in the literature, mainly including the synthesis methods to finely disperse inert supports among CaO particles and various inert supports to prevent sintering. In addition, the effectiveness of various supports via different incorporating methods and test conditions are discussed and quantitatively compared in the current work. The highly required future development trends of synthetic CaO sorbents are also recommended in the last part of this work. We expect that this work will inspire and guide researchers from both academic and industrial communities and help pave the way for major breakthroughs in both fundamental research and industrial applications in this field.