Solid-liquid phase-change absorbents (SLPCAs) have a great potential to reduce the energy consumption of CO₂ capture. The main issue in the practical application of SLPCAs is the difficulty in the phase separation of gelatinous solid products. In this study, 2-amino-2-methyl-1-propanol (AMP) was used as a regulator to tune the physical form of the solid products of triethylenetetramine (TETA)-based SLPCAs. Experimental results showed that the AMP-regulated TETA-based SLPCAs successfully avoided the formation of gelatinous products (viscosity up to more than 1000 mPa·s) and yielded easily separated crystalline powders. Among the investigated SLPCAs, TETA/AMP/N-methyl-2-pyrrolidone (NMP) (TETA:AMP = 2:8, 1 M) exhibited the best CO₂ capture performance with a high CO₂ loading of 0.94 mol·mol⁻¹ and a high regeneration efficiency of 84.14 %. XRD, FT-IR and ¹³C NMR analyses indicated that TETA/AMP/NMP absorbed CO₂ to form highly polar carbamate species and protonated amines, which could break the original assimilation state of the SLPCA system; thus, the polar products precipitated out from less polar NMP, leading to a phase change. The theoretical calculations revealed that in the absence of AMP, the TETA-derived products had a tendency to form gelatinous aggregation with large amounts of hydrogen bonds; with the introduction of AMP, the AMP-derived products tended to combine with the TETA-derived products via strong electrostatic attraction and Van der Waals force and effectively inhibited the aggregation formation. Since there was only one hydrogen bond forming between the AMP- and TETA-derived product molecules, the amount of hydrogen bonds was significantly reduced. Eventually, the TETA/AMP/NMP SLPCA avoided the formation of gelatinous products and yielded crystalline powder products.

固液相变吸收剂 (SLPCA) 具有降低 CO ₂捕获能耗的巨大潜力。SLPCAs实际应用中的主要问题是凝胶状固体产物的相分离困难。在这项研究中，2-amino-2-methyl-1-propanol (AMP) 被用作调节剂来调整基于三乙烯四胺 (TETA) 的 SLPCA 固体产物的物理形态。实验结果表明，AMP 调控的基于 TETA 的 SLPCAs 成功地避免了凝胶状产物（粘度高达 1000 mPa·s 以上）的形成，并产生易于分离的结晶粉末。在研究的 SLPCA 中，TETA/AMP/ N -methyl -2-pyrrolidone (NMP) (TETA:AMP = 2:8, 1 M) 表现出最好的 CO ₂具有0.94 mol·mol ^-1的高 CO ₂负载和 84.14 % 的高再生效率。XRD、FT-IR 和¹³ C NMR 分析表明 TETA/AMP/NMP 吸收了 CO ₂形成高极性的氨基甲酸酯物种和质子化胺，可以打破SLPCA系统的原始同化状态；因此，极性产物从极性较小的 NMP 中沉淀出来，导致相变。理论计算表明，在不存在 AMP 的情况下，TETA 衍生产品倾向于形成具有大量氢键的凝胶状聚集体；随着AMP的引入，AMP衍生产物倾向于通过强静电引力和范德华力与TETA衍生产物结合，有效抑制聚集形成。由于 AMP 和 TETA 衍生产物分子之间仅形成一个氢键，因此氢键的数量显着减少。最终，