A Basic Study On Uses of Nano CaO Based CO2 Adsorbent in the CFBs Coal Gasification for CO2 Sequestration

In this paper, we study a nano CaO-based CO2 adsorbent obtained from a nano CaCO3 precursor by calcination. Nano CaO-based CO2 adsorbents possess special features that underline their potential use in circulating fluidized beds coal gasification. A fixed fluid bed reactor was used to evaluate the target adsorbent, which was then analyzed using a thermo-gravimetric analyzer. The following properties were observed from the adsorbent produced: (1) lower carbonation and regeneration temperatures. This means energy savings in the CaCO3 regeneration looping system; (2) faster reaction rate with CO2. As such, the adsorbent meets the fast reaction needs of CFB systems; (3) higher sorption capacity of CO2, especially in fast reaction, and lower decay of sorption capacity; and (4) lower attrition loss during the looping process. Overall, the observed properties demonstrate the applicability of nano CaO-based CO2 adsorbents in CFB coal gasification and reactive sorption enhanced reforming. Keywords: CO2 adsorption, fixed fluid bed, nano CaO, nano CaCO3