Post-combustion CO2 capture using solid K2CO3: Discovering the carbonation reaction mechanism

Enhanced capacity to CO2 sorption in humid conditions with a K-doped biocarbon

“…Jayakumar et al . [3] have confirmed that the carbonation and hydration reactions of K 2 CO 3 ( Eqs. (1 ) and ( 2 ), respectively) occur as competing reversible and parallel reactions in a simulated flue gas atmosphere, whilst reaction ( 3 ) does not occur or is negligible.…”

“…Among the various kinds of alkali metal-based sorbents [7][8][9][10] , K 2 CO 3 doped AC (activated carbon) has shown high CO 2 capture capacity and rapid carbonation reaction rate [11] . K 2 CO 3 can capture CO 2 from flue gas at low temperatures (40-80 °C), forming potassium bicarbonate (KHCO 3 ) via the carbonation reaction [3] . Thus, it is very important to control the carbonation reaction rate and to tune the CO 2 absorption capacity of these sorbents in order to design a suitable dry regenerable sorbent for CO 2 capture [6] .…”

“…Post-combustion technologies can be retrofitted to existing facilities and, therefore, are convenient to be deployed at large scale in a short time frame. Hence, post-combustion CO 2 capture can offer an interim solution for CO 2 removal from combustion flue gases, until new clean energy generation technologies emerge [3] .…”

Understanding the CO2 sorption mechanisms of the MgO‐doped Na‐based sorbent at low temperatures

“…However, in the above research studies, the phase change of Na/K‐based sorbents with MgO addition after sorption was verified just by X‐ray diffraction (XRD) to extrapolate the possible mechanism. XRD analysis may have some limitations in confirming the existence of a substance . And the effect mechanism of MgO in CO 2 sorption of Na‐based sorbents remains unclear.…”

“…XRD analysis may have some limitations in confirming the existence of a substance. 37 And the effect mechanism of MgO in CO 2 sorption of Na-based sorbents remains unclear. Besides, in previous studies on supporting Na-based sorbents with MgO introduction, the loading of Na 2 CO 3 is relatively low (below 25 wt%), resulting in limited CO 2 sorption capacity.…”