Synthesis, characterization and low-temperature carbonation of mesoporous magnesium oxide

A sample of MgO was successfully synthesized using thermal decomposition of hydromagnesite and compared to commercial material. The characterization of materials using XRD, SEM, BET and BJH methods showed that the thermal decomposition way led to rectangular mesoporous microsheets with high specific surface area of 100 m 2 g −1 . This porous magnesium oxide has been shown to be a potential candidate for CO 2 capture at low temperatures range (30 and 50 °C), low pressures of CO 2 ( P CO 2 = 600 mbar ) and in the presence of water vapor ( P H 2 O = 15 mbar ). In these conditions, our results show that 11% of MgO was converted to hydrated magnesium carbonate MgCO 3 ·3H 2 O after 8 h of carbonation in a thermobalance and reached 54% after 24 h of carbonation using tube furnace. After carbonation, hydration reaction pore size and surface area have noticeably changed.