Abstract
ABSTRACT The aim of this work is to prepare the nano-CaO–CaTiO3 adsorbents with both high CO2 sorption capacity and high durability. A series of nano-CaO–CaTiO3 adsorbents with different CaTiO3 grain sizes were in situ prepared by the reaction between TiO2 and nano-CaO with variation of the preparation methods, doping contents and thermal pretreatment conditions. The results showed that the CaTiO3 grain size would decrease by adopting the adsorption phase reaction method, reducing the doping content as well as thermal pretreatment temperature and time properly. Moreover, smaller CaTiO3 grain size was favourable for increasing sorption capacity of the adsorbent, while larger CaTiO3 grain size was more helpful for improving the durability. Under the consideration of the benefit of both the sorption capacity and the durability of adsorbents, the optimal CaTiO3 grain size was got as 23.5 nm and its sorption capacity remained 8.52 mol/kg at the 50th cycle under the actual severe regeneration condition.
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