Core-shell structured CaO-based pellets protected by mesoporous ceramics shells for high-temperature CO2 capture

Sedghkerdar, Mohammad Hashem; Mahinpey, Nader; Soleimanisalim, Amir H.; Sun, Zhenkun; Chen, Zhiwei; Lim, Jim; Kaliaguine, Serge
November 2016
Canadian Journal of Chemical Engineering;Nov2016, Vol. 94 Issue 11, p2038
Academic Journal
In this study, a series of core-shell structured spheriform CO2 sorbents were synthesized by using CaO-based pellets as cores and different mesoporous metal oxides (e.g. alumina, ceria, and yttrium-stabilized zirconia) as shells through a repeated wet impregnation coating process. Cyclic CO2 capture performance of the obtained sorbents was investigated using a thermogravimetric analyzer. Among all the core/shell sorbents under study, the pellets coated with a layer of alumina exhibit the best performance in the retention of CO2 uptake over 20 cycles with the lowest activity loss of only 30.4 %, attributed to the existence of the thermal stable porous alumina shell which prevents the sintering and the aggregation of the CaO grains. Moreover, the attrition study using an air-jet apparatus and a standard test method reveals that such sorbents exhibit enhanced attrition resistance due to the protection of the porous shell providing them with a great potential for application in fluidized bed conditions.


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