The CO2 sequestration is becoming more and more important due the global warming. Recently, Ca-based material, such as limestone, has been reported to be used for the capture of CO2 in the cement industry. However, its CO2 adsorption capability will decline dramatically after several cycles due to the surface sintering. Here we added some metal oxides as skeleton to delay the sintering of limestone. A variety of metal oxide such as MgO, SiO2 as well as Fe2O3 were studied. We found that the CO2 adsorption capability of Ca-based material increase after modified by MgO. It’s increase 8% with 1 wt% adding amount. However, in the case of SiO2 or Fe2O3, there is no improvement. SEM study show that MgO covered on the surface of limestone as rigid skeleton to keep its porous surface, so its ability of anti-sintering was improved, and as a consequence, it’s CO2adsorption capability increased.

Metal oxide modified limestone for CO2 adsorption

249th National Meeting (2015)

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