Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 138, Issue 3, Pages 1923-1933Publisher
SPRINGER
DOI: 10.1007/s10973-019-08431-1
Keywords
CO2 capture; Magnesium oxide; Mesoporous; Nesquehonite; Thermogravimetric analysis
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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 CO2 capture at low temperatures range (30 and 50 degrees C), low pressures of CO2 (PCO2=600mbar) and in the presence of water vapor (P-H2O=15mbar). In these conditions, our results show that 11% of MgO was converted to hydrated magnesium carbonate MgCO3 center dot 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.
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