Supports are commonly used to increase the stability and prevent the agglomeration of solid CO₂ sorbents. However, the exact surface changes and carbonation mechanism on supported sorbents have not been directly observed. Knowing such insight would not only allow a better understanding of the surface phenomenon on supported sorbents but would also help to identify the exact role of the supports. In this study, real-time CO₂ sorption observations on Al₂O₃-supported eutectic mixture (EM)-promoted MgO sorbents were obtained to determine the role of Al₂O₃ support in the sorption process. EM-MgO-Al₂O₃ exhibited stable sorption-regeneration cyclic performance and maintained a capacity of ∼13 wt% after 12 cycles. In situ TEM was then utilized to directly observe the sorption and regeneration phenomenon on the sorbent. Results show that MgCO₃ evolution proceeds with the formation of separated mushroom-like branches along the surface of the sorbent, contrary to the surface layer formation on unsupported sorbents. The same mushroom-like morphology was also observed during resorption, although smaller yet denser products formed due to MgO regeneration. Such morphology was observed due to the presence of Al₂O₃, which alters the sorbent surface, redistributes triple-phase boundaries, and directs the formation of MgCO₃ towards the MgO active sites. This consequently avoids MgCO₃ agglomeration and improves the cyclic stability of the sorbent. Hence, a better understanding of the carbonation mechanism and the role of support in solid sorbents was obtained.

载体通常用于增加稳定性并防止固体CO ₂吸附剂结块。然而，还没有直接观察到载体吸附剂的确切表面变化和碳化机理。知道这种见解不仅可以更好地理解负载型吸附剂上的表面现象，还可以帮助确定载体的确切作用。在这项研究中，实时CO ₂对Al吸附观测₂ ö ₃ -支持低共熔混合物（EM）促进的，得到的MgO的吸附剂，以确定A1的角色₂ Ó ₃支撑在吸附过程。EM-MgO-Al ₂ O ₃表现出稳定的吸附-再生循环性能，并在12个循环后保持约13 wt％的容量。然后利用原位透射电镜直接观察吸附剂上的吸附和再生现象。结果表明，MgCO _3的释放随着吸附剂表面上分离的蘑菇状分支的形成而进行，这与无载体吸附剂上的表面层形成相反。在吸收过程中也观察到相同的蘑菇状形态，尽管由于MgO再生而形成了较小但致密的产物。观察到这种形态是由于存在Al ₂ O ₃，Al ₂ O ₃改变了吸附剂表面，重新分布了三相边界，并指导了MgCO ₃的形成。对MgO活动站点。因此，这避免了MgCO _3的团聚并提高了吸附剂的循环稳定性。因此，可以更好地了解碳酸化机理以及载体在固体吸附剂中的作用。