A novel magnesium hydroxide-based sorbent that can capture CO2 from 200 to 315 �C was developed and patented by NETL researchers. The sorbent is also regenerable at 375-400 �C.  The capture process with this novel warm gas CO2 removal sorbent involves the chemical reaction, Mg(OH)2 + CO2 ->MgCO3 +H2O.   Mg(OH)2 has a very high CO2 sorption capacity at 200�315 �C which is considerably higher than that of the commercial Selexol process.   Two carbonate species formed during CO2 capture over Mg(OH)2 were identified using an FTIR.  Bridged carbonate reached a maximum concentration after 10 minutes where as the bidentate carbonate intensity continued to increase.  Correlating the IR data to the bench scale data indicates the bidentate carbonate formation continues after the usable capture capacity is reached.  The paper is going to investigate promoting the rate of formation of bidentate carbonate to shift this capacity to a useable capacity (e.g. greater than 90% capture).

Investigation
of the adsorbed species of CO<sub>2</sub> over Mg(OH)<sub>2</sub>

241st National Meeting (2011)

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Investigation of the adsorbed species of CO2 over Mg(OH)2

Investigation of the adsorbed species of CO₂ over Mg(OH)₂