Abstract
A novel sorbent, MgO/Al2O3-supported K2CO3, for CO2 sorption was prepared. It was found that the sorbent prepared by the multi-impregnation method showed a large CO2 capture capacity at low temperature under simulated flue gases with MgO loading of 10 and 20 wt % (KMgAlI3010 and KMgAlI3020). The presence of water vapor pretreatment and MgO loadings had different effects on the CO2 adsorption mechanisms. For the KMgAlI3010 sorbent, the main phase was KHCO3 after CO2 adsorption. While for the KMgAlI3020 sorbent, when pretreated with less steam, the main phase was Mg2Al2(CO3)4(OH)2·15H2O after CO2 adsorption. When pretreated with excess steam, however, the CO2 adsorption mechanism was similar to the KMgAlI3010 sorbent. Furthermore, the as-prepared KMgAl sorbents were stable even after 30 adsorption/desorption cycles.
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