Stabilized Performance of Al‐Decorated and Al/Mg Co‐Decorated Spray‐Dried CaO‐Based CO 2 Sorbents

The sharp loss‐in‐capacity in CO 2 capture as a result of sintering is a major drawback for CaO‐based sorbents used in the calcium looping process. The decoration of inert supports effectively stabilizes the cyclic CO 2 capture performance of CaO‐based sorbents via sintering mitigation. A range of Al‐decorated and Al/Mg co‐decorated CaO‐based sorbents were synthesized via an easily scaled‐up spray‐drying route. The decoration of Al‐based and Al/Mg‐based supports efficiently enhanced the cyclic CO 2 capture capability of CaO‐based sorbents under severe testing conditions. The CO 2 capture capacity losses of Al‐decorated and Al/Mg co‐decorated CaO‐based sorbents were alleviated, representing more stable CO 2 capture performance. The stabilized CO 2 capture performance is mainly attributed to the formation of Ca 12 Al 14 O 33 , MgAl 2 O 4 , and MgO that act as the skeleton structures to mitigate the sintering of CaCO 3 during carbonation/calcination cycles.