Novel MgO-doped CaO sorbent pellets were prepared by gel-casting and wet impregnation. The effect of Na⁺ and MgO on the structure and CO₂ adsorption performance of CaO sorbent pellets was elucidated. MgO-doped CaO sorbent pellets with the diameter range of 0.5–1.5 mm exhibited an excellent capacity for CO₂ adsorption and adsorption rate due to the homogeneous dispersion of MgO in the sorbent pellets and its effects on the physical structure of sorbents. The results show that MgO can effectively inhibit the sintering of CaO and retain the adsorption capacity of sorbents during multiple adsorption-desorption cycles. The presence of mesopores and macropores resulted in appreciable change of volume from CaO (16.7 cm³·mol⁻¹) to CaCO₃ (36.9 cm³·mol⁻¹) over repeated operation cycles. Ca2Mg1 sorbent pellets exhibited favorable CO₂ capture capacity (9.49 mmol·g⁻¹), average adsorption rate (0.32 mmol·g⁻¹·min⁻¹)and conversion rate of CaO (74.83%) after 30 cycles.

通过凝胶浇铸和湿法浸渍制备了新型的MgO掺杂CaO吸附剂小球。阐明了Na ⁺和MgO对CaO吸附剂颗粒结构和CO ₂吸附性能的影响。直径在0.5-1.5 mm范围内的MgO掺杂的CaO吸附剂小球具有出色的CO ₂吸附能力和吸附速率，这是由于MgO在吸附剂小球中的均匀分散及其对吸附剂物理结构的影响。结果表明，MgO可以有效地抑制CaO的烧结，并在多次吸附-解吸循环中保持吸附剂的吸附能力。中孔和大孔的存在导致CaO的体积发生明显变化（16.7 cm ³ ·mol ^-1）在重复的操作循环中转化为CaCO ₃（36.9 cm ³ ·mol ^-1）。Ca2Mg1吸附剂颗粒在30个循环后表现出良好的CO ₂捕集能力（9.49 mmol·g ^-1），平均吸附率（0.32 mmol·g ^-1 ·min ^-1）和CaO的转化率（74.83％）。