High temperature CO2 capture using calcium oxide sorbent in a fixed-bed reactor

High temperature CO2 sorbents and their application for hydrogen production by sorption enhanced steam reforming process

“…The CO 2 chemisorption on CaO generally consists of two regimes, fast and slow kinetic steps. Dou et al [27], Rout et al [28] and Mohammadi et al [29] performed kinetic studies on the carbonation reaction of different Ca-based synthetic sorbents and found that the carbonation reaction was controlled by both chemical reaction at the CaO-CaCO 3 interface and carbonate layer diffusion. The fast kinetic step, which is controlled by chemical reaction, will be continued untill the carbonate layer surrounding the unreacted CaO core is completed.…”

Development of sodium/lithium/fly ash sorbents for high temperature post-combustion CO 2 capture

“…Also, industrial plants such as cement and steel works generate flue gas at temperatures higher than 900°C [8,9]. Therefore, the development of efficient CO 2 sorbents able to work at high temperatures would help to reduce the associated CO 2 capture energy penalty, since CO 2 sorption thermodynamics and rapid sorption kinetics are favoured at high temperature [8,10]. Among solid sorbents, CaO-based sorbents are especially advantageous because of their high sorption capacity and rapid kinetics in the 400-800°C temperature range and have been tested in pilot scale (1.9 MWth) [11].…”

The Effects of Thermal Treatment and Steam Addition on Integrated CuO/CaO Chemical Looping Combustion for CO2 Capture

“…For example, Qin et al [17] studied various heat pre-treatment procedures with CaO/CuO pellet mixing to overcome the loss of performance and found that certain thermal treatments improved the multi-cycle CaL stability. Steam, which is present in post combustion flue gas, has also been demonstrated to have a positive effect on the stability of pure CaO pellets to capture CO 2 over multiple cycles [17][18][19][20][21][22][23][24]. Several theories have been proposed to explain how steam improves the CaL process.…”

“…Manovic et al [19] suggested that the presence of steam promotes carbonation by enhancing the solid-state diffusion of CO 2 through the CaCO 3 layer forming over the CaO. Dou et al [24] suggested that steam promotes the formation of Ca(OH) 2 that will react with CO 2 to form Ca(HCO 3 ) 2 and increase the amount of carbonation. In contrast, Yang and Xiao [22] reported that the performance of CaO was improved even without the formation of Ca(OH) 2 .…”