Experimental studies of modified limestone for CO2 capture in multiple carbonation/calcination cycles

Experimental investigations have been carried out on the calcium oxide obtained by the calcination of domestic limestone from eastern Taiwan to determine the absorption performance of CO2. Repetitive carbonation/calcination reaction with modified sorbents, i.e., the synthetic sol-gel sorbent (sol-gel), limestone modified with pyroligneous acid (PA), and cesium-doped CaO sorbents (doped Cs) in a fixed bed was operated to enhance the reactivity and durability of the sorbents for CO2 capture. The liquid-phase hydration treatment on the modified sorbent was also employed to improve the capture capability of CO2. Conversions for the repetitive carbonation/calcination reaction of modified sorbents were evaluated under different operating conditions. The empirical models for the decay of the CO2 capture by the previous investigation were presented in comparison with the experimental results. (C) 2013 Taiwan Institute of Chemical Engineers. Published by Elsevier B.V. All rights reserved.