MgO-based sorbents were prepared by impregnation with K₂CO₃ at different loadings. This study examined the CO₂ absorption and regeneration properties of MgO-based sorbents at various pressures. The CO₂ capture capacity of the PMI-30 sorbent increased to 204.4 mg CO₂/g sorbent with increasing absorption pressure through CO₂ absorption by MgO itself and K₂CO₃ by generating structures, such as MgCO₃·3H₂O and K₂Mg(CO₃)₂. However, no KHCO₃ phase was observed after CO₂ absorption at 1, 10, and 20 atm. The CO₂ capture capacity of the MgO and PMI-10, 20, 30, and 40 sorbents was the 94.6, 129.9, 156.6, 204.4, and 239.4 mg CO₂/g sorbent, respectively. The CO₂ capture capacity of MgO in the PMI sorbent was relatively constant regardless of the decreasing MgO content and increasing K₂CO₃ content. The CO₂ absorption ability of MgO was calculated by substracting theoretical CO₂ capture capacity of K₂CO₃ from the total capacity of sorbents. The TPD experiment performed at 1 atm after CO₂ absorption at 20 atm showed that the regeneration temperature of the PMI sorbents differed according to the K₂CO₃ loading.

MgO 基吸附剂是通过在不同负载量下用 K ₂ CO ₃浸渍来制备的。本研究考察了MgO 基吸附剂在不同压力下的 CO ₂吸收和再生性能。PMI-30吸附剂的CO ₂捕获能力随着吸收压力的增加而增加至204.4 mg CO ₂ /g 吸附剂，通过MgO本身吸收CO ₂和通过生成MgCO ₃ ·3H ₂ O和K等结构的K ₂ CO _{3 2} Mg(CO ₃ ) ₂。然而，在CO ₂之后没有观察到KHCO ₃相在 1、10 和 20 个大气压下的吸收。MgO 和 PMI-10、20、30 和 40 吸附剂的 CO ₂捕获能力分别为 94.6、129.9、156.6、204.4 和 239.4 mg CO ₂ /g 吸附剂。无论降低 MgO 含量和增加 K ₂ CO ₃含量，PMI 吸附剂中 MgO的 CO ₂捕获能力相对恒定。通过从吸附剂的总容量中减去K ₂ CO _{3 的}理论CO ₂捕获容量来计算MgO的CO ₂吸附容量。TPD 实验在 CO ₂后 1 个大气压下进行在 20 atm 下的吸收表明，PMI 吸附剂的再生温度因 K ₂ CO ₃负载而异。