This paper presented the effect of the concentration of Mg(NO₃)₂·6H₂O solution and Al doping on the structure, morphology and CO₂ adsorption performances of MgO spheres. MgO-based spheres were synthesized through a sacrificial templating method using glucose-derived carbon spheres as the template and Mg(NO₃)₂·6H₂O and Al(NO₃)₃·9H₂O as precursors, and characterized by SEM, XRD, TEM, N₂ adsorption/desorption, FT-IR and particle size analysis, respectively. The results demonstrated that hollow MgO spheres were formed with multiple shells, and the concentration of Mg²⁺ affected the crystallite size and average particle size. With Al incorporation, the crystallite size and average particle size of Mg/Al-10 was obviously reduced, which further influenced alkaline adsorption active sites and internal diffusion of CO₂ molecules. As such, the adsorption capacity of the Al-doped adsorbent was greatly improved, for the tiny MgO nanocrystals can provide many more alkaline adsorption active sites and thus significantly advancing CO₂ adsorption, while the small average particle size can shorten the diffusion distance of CO₂ and increase the contact between the adsorbent and CO₂. This work provided the inspiration of MgO-based adsorbent for promoting CO₂ adsorption.

提出了Mg（NO ₃）₂ ·6H ₂ O溶液浓度和Al掺杂对MgO球结构，形貌和CO ₂吸附性能的影响。以葡萄糖为原料的碳球为模板，以Mg（NO ₃）₂ ·6H ₂ O和Al（NO ₃）₃ ·9H ₂ O为前驱体，通过牺牲模板法合成了MgO基球。 XRD，TEM，N ₂吸附/解吸，红外光谱和粒度分析。结果表明，中空的MgO球形成了多个壳，并且Mg ²⁺的浓度影响微晶尺寸和平均粒径。随着铝的掺入，Mg / Al-10的晶粒尺寸和平均粒径明显减小，这进一步影响了碱吸附活性位和CO ₂分子的内部扩散。如此，大大提高了掺铝吸附剂的吸附能力，因为微小的MgO纳米晶体可以提供更多的碱性吸附活性位点，从而显着促进CO ₂吸附，而小的平均粒径则可以缩短CO的扩散距离。₂并增加吸附剂与CO ₂的接触。这项工作为基于MgO的吸附剂促进CO ₂吸附提供了启示。