Abstract Tertiary amines are thermodynamically efficient CO2 absorbents but unfortunately suffer from low absorption rates. To overcome this issue the use of formulated absorbents incorporating simple aliphatic amines and di-amines as promoters have been suggested. This work describes the fundamental CO2 capture behaviour in tertiary amine diethylethanolamine (DEEA) based solution with a series of kinetic promoters monoethanolamine (MEA), N,N-dimethyl-1,3-propanediamine (N,N-DM13PDA), N,N-dimethyl-1,2-ethanediamine (N,N-DM12EDA), and 4-amino-1-methylpiperidine (4-A1MPD). The CO2 absorption rate and cyclic capacity was significantly enhanced due to the additional diamines. Using NMR technology, the underlying effect of the additives on the chemical speciation e.g. carbamate, (bi)carbonate was interrogated. The absorbents were found to initially favour carbamate at low CO2 loadings, transitioning to the energetically favoured (bi)carbonate adduct as the total CO2 concentration elevates. Unlike the energy intensive MEA absorbent, rapid and deep CO2 removal was achieved in the new proposed di-amine blend solutions, affirming its promising potential for CO2 capture.

中文翻译：

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单胺和二胺在混合胺水溶液中作为 CO2 捕集动力学促进剂的作用

摘要 叔胺是热力学高效的 CO2 吸收剂，但不幸的是吸收率低。为了克服这个问题，已经建议使用包含简单脂肪胺和二胺作为促进剂的配制吸收剂。这项工作描述了基于叔胺二乙基乙醇胺 (DEEA) 的溶液中的基本 CO2 捕获行为，其中包含一系列动力学促进剂单乙醇胺 (MEA)、N,N-二甲基-1,3-丙二胺 (N,N-DM13PDA)、N,N -二甲基-1,2-乙二胺 (N,N-DM12EDA) 和 4-氨基-1-甲基哌啶 (4-AlMPD)。由于额外的二胺，CO2 吸收率和循环容量显着提高。使用 NMR 技术，研究了添加剂对化学形态的潜在影响，例如氨基甲酸盐、（碳酸氢盐）。发现吸收剂最初在低 CO2 负载下偏爱氨基甲酸酯，随着 CO2 总浓度升高，转变为能量偏爱的（重）碳酸盐加合物。与能源密集型 MEA 吸收剂不同，在新提出的二胺混合溶液中实现了快速和深入的 CO2 去除，肯定了其在 CO2 捕获方面的潜力。