LAUSR

Abstract MgO based adsorbent for CO2 capture can be achieved quite easily from the abundant, low cost and non-toxic magnesite (main ingredient MgCO3). Water vapor was also added to simulate real flue gas. By investigation, the CO2 capacity of magnesite calcined at 550 °C for 4 h can reach 1.82 mmol/g under the adsorption condition of 60 °C, 0.4 Mpa, 100 mL/min 10% CO2 flow rate in the present of water vapor. And the cycling test results indicated that the adsorption capacity kept still 0.96 mmol/g after eighth cycles, showing the adsorbent had preferably cycle stability. XRD shows that the magnesite nearly don't decompose at 450 °C, higher temperature is needed to make magnesite decompose completely. The BET results verify that the magnesite calcined at 450 °C nearly has no pore structure. Under 500 °C, the BET surface is 122.8 m2/g. At 550 °C, the BET has a slightly decline, 118.6 m2/g, which indicates that the sintering occurred. The CO2 adsorption capacity not only relates to the BET, but also the effect of steam condensation. The results of FT-IR and CO2-TPD indicate that the CO2 can be adsorbed on calcined magnesite successfully mainly by chemisorption, but the physical adsorption also exists.