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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Direct CO2 Capture from Air using Poly(ethylenimine)-Loaded Polymer/Silica Fiber Sorbents
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Direct CO2 Capture from Air using Poly(ethylenimine)-Loaded Polymer/Silica Fiber Sorbents

机译：使用聚（乙基亚胺）加载的聚合物/二氧化硅纤维吸附剂直接CO 2从空气中捕获

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摘要

Direct CO2 capture from atmospheric air is gaining increased attention as one of the most scalable negative carbon approaches available to tackle climate change if coupled with the sequestration of CO2 geologically. Furthermore, it can also provide CO2 for further utilization from a globally uniform source, which is especially advantageous for economies without natural sources of carbon-based feedstocks. Solid-supported amine-based materials are effective for direct air capture (DAC) due to their high CO2 uptakes and acceptable sorption kinetics at ambient temperature. In this work, we describe the application of polymer/silica fiber sorbents functionalized with a primary amine-rich polymer, poly(ethylenimine) (PEI), for DAC. Monolithic fiber sorbents composed of cellulose acetate and SiO2 are synthesized via the dry-jet, wet quench spinning technique. These fibers are then functionalized with PEI (M-w 800 Da) in a simple and scalable postspinning infusion step and tested for CO2 capture under pseudoequilibrium conditions as well as under breakthrough conditions. An investigation to study the effect of feed flow rate, adsorption temperature, and presence of moisture in the feed on the CO2 breakthrough performance of a densely packed fiber sorbent module is conducted to highlight the potential application of this class of structured contactors in direct air capture. The pressure drop of these contactors at high gas velocities is also evaluated. Finally, a vacuum-assisted desorption step is demonstrated for production of high-purity CO2 from both dry and humid ambient air mixtures.
机译：从大气空气中直接CO2捕获正在增加，因为如果与地质上的二氧化碳的封存，可用于处理气候变化的最可扩展的负碳方法之一。此外，它还可以提供来自全球均匀源的进一步利用的CO 2，这对于没有碳基原料的天然来源的经济性特别有利。固体支持的胺基材料对于由于其高CO 2上唇和环境温度的可接受的吸附动力学而有效的基于空气捕获（DAC）。在这项工作中，我们描述了用富胺类聚合物，聚（乙基亚胺）（PEI）官能化的聚合物/二氧化硅纤维吸附剂用于DAC。由干射流，湿淬火纺丝技术合成由醋酸纤维素和SiO 2组成的整体纤维吸附剂。然后将这些纤维用PEI（M-W 800Da）在简单且可扩展的杂项输注步骤中用PEI（M-W 800Da）官能化，并在假易足病症条件下以及在突破条件下测试CO 2。研究进料流速，吸附温度和水分在饲料中的效果对浓密填充纤维吸附剂模块的CO2突破性性能的研究进行研究，以突出这类结构化接触器在直接空气捕获中的潜在应用。还评估了在高气体速度下这些接触器的压降。最后，对干燥和潮湿的环境空气混合物来说，证明了真空辅助解吸步骤用于生产高纯度CO 2。

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