Abstract: A series of molten salts promoted MgO adsorbents were prepared by the impregnation method and their CO2 capture performance has been systematically tested with diluted CO2 to address future applicability for sorption enhanced water gas shift (SEWGS) and commercial CO2 capture. These adsorbents were investigated by means of TGA, XRD, BET, and in situ DRIFTS. The results demonstrated that the carbonation of these samples under reactive conditions mainly generated three different kinds of carbonate species including bicarbonate, unidentate and bidentate carbonate. The formed monodentate carbonate blocked the active sites of Mg−O−Mg and resulted in the deactivation of MgO. In situ investigation of the CO2 interaction indicated that molten salts promoted the dissolution of CO2 into carbonate ions rapidly and therefore prevent the generation of the CO2−impermeable, monodentate carbonate layer on the surfaces of MgO particles to allow the high rate of CO2 uptake. The molten−salts promoted MgO adsorbents with intriguing structural and excellent CO2 capture properties, low regeneration temperature, favorable thermal stability and ease of fabrication open their place in practical applications for SEWGS process.
5:00 PM–7:00 PM Apr 23, 2019 (US - Arizona)
PCC North, 300 Level, Exhibit Hall C-E