Abstract Aqueous solutions of tertiary amines are promising absorbents for CO2 capture, as they are typically characterized by a high absorption capacity, low heat of reaction, and low corrosivity. However, tertiary amines also exhibit very low kinetics of CO2 absorption, which has made them unattractive options for large-scale utilization. Here, a series of novel nanoporous carbonaceous promoters (NCPs) with different properties were synthesized, characterized, and used as rate promoters for CO2 absorption in aqueous N, N-diethylethanolamine (DEEA) solutions. To prepare a DEEA–NCP nanofluid, NCPs were dispersed into aqueous 3 mol∙L−1 DEEA solution using ultrasonication. The results revealed that among microporous (GC) and mesoporous (GS) carbonaceous structures functionalized with ethylenediamine (EDA) and polyethyleneimine (PEI) molecules, the GC–EDA promoter exhibited the best performance. A comparison between DEEA–GC–EDA nanofluid and typical aqueous DEEA solutions highlighted that the GC-EDA promoter enhances the rate of CO2 absorption at 40 °C by 38.6% (36.8–50.7 kPa·min−1) and improves the equilibrium CO2 absorption capacity (15 kPa; 40 °C) by 13.2% (0.69–0.78 mol of CO2 per mole of DEEA). Moreover, the recyclability of DEEA–GC–EDA nanofluid was determined and a promotion mechanism is suggested. The outcomes demonstrate that NCP–GC–EDA in tertiary amines is a promising strategy to enhance the rate of CO2 absorption and facilitate their large-scale deployment.

中文翻译：

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用于增强叔胺中 CO2 吸收的纳米多孔碳质促进剂的制备

摘要 叔胺水溶液具有吸收能力高、反应热低、腐蚀性低等特点，是一种很有前途的二氧化碳捕集吸收剂。然而，叔胺也表现出非常低的 CO2 吸收动力学，这使得它们在大规模利用方面没有吸引力。在这里，合成、表征了一系列具有不同性质的新型纳米多孔碳质促进剂 (NCP)，并将其用作 N, N-二乙基乙醇胺 (DEEA) 水溶液中 CO2 吸收的速率促进剂。为了制备 DEEA-NCP 纳米流体，使用超声波将 NCPs 分散到 3 mol∙L-1 DEEA 水溶液中。结果表明，在用乙二胺 (EDA) 和聚乙烯亚胺 (PEI) 分子功能化的微孔 (GC) 和介孔 (GS) 碳质结构中，GC-EDA 启动子表现出最好的性能。DEEA-GC-EDA 纳米流体与典型的 DEEA 水溶液之间的比较突出表明，GC-EDA 促进剂将 40°C 下的 CO2 吸收率提高了 38.6%（36.8-50.7 kPa·min-1）并改善了平衡 CO2 吸收容量（15 kPa；40 °C）增加 13.2%（每摩尔 DEEA 产生 0.69–0.78 摩尔 CO2）。此外，还确定了 DEEA-GC-EDA 纳米流体的可回收性，并提出了促进机制。结果表明，叔胺中的 NCP-GC-EDA 是一种很有前景的策略，可提高 CO2 吸收率并促进其大规模部署。8–50.7 kPa·min-1) 并将平衡 CO2 吸收容量 (15 kPa; 40 °C) 提高 13.2%（每摩尔 DEEA 0.69–0.78 mol CO2）。此外，还确定了 DEEA-GC-EDA 纳米流体的可回收性，并提出了促进机制。结果表明，叔胺中的 NCP-GC-EDA 是一种很有前景的策略，可提高 CO2 吸收率并促进其大规模部署。8–50.7 kPa·min-1) 并将平衡 CO2 吸收容量 (15 kPa; 40 °C) 提高 13.2%（每摩尔 DEEA 0.69–0.78 mol CO2）。此外，还确定了 DEEA-GC-EDA 纳米流体的可回收性，并提出了促进机制。结果表明，叔胺中的 NCP-GC-EDA 是一种很有前景的策略，可提高 CO2 吸收率并促进其大规模部署。