Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA.
Nat Commun. 2014 Dec 12;5:5796. doi: 10.1038/ncomms6796.
Adsorption using solid amine sorbents is an attractive emerging technology for energy-efficient carbon capture. Current syntheses for solid amine sorbents mainly based on physical impregnation or grafting-to methods (for example, aminosilane-grafting) lead to limited sorbent performance in terms of stability and working capacity, respectively. Here we report a family of solid amine sorbents using a grafting-from synthesis approach and synthesized by cationic polymerization of oxazolines on mesoporous silica. The sorbent with high amount of covalently tethered amines shows fast adsorption rate, high amine efficiency and sorbent capacity well exceeding the highest value reported to date for low-temperature carbon dioxide sorbents under simulated flue gas conditions. The demonstrated efficiency of the new amine-immobilization chemistry may open up new avenues in the development of advanced carbon dioxide sorbents, as well as other nitrogen-functionalized systems.
使用固体胺吸附剂的吸附是一种有吸引力的新兴节能碳捕获技术。目前，固体胺吸附剂的主要合成方法是基于物理浸渍或接枝方法（例如，氨丙基硅烷接枝），分别导致吸附剂在稳定性和工作容量方面的有限性能。在这里，我们报告了一系列使用接枝聚合方法合成的固体胺吸附剂，该方法是通过恶唑啉在介孔硅上的阳离子聚合合成的。具有大量共价键合胺的吸附剂具有快速吸附速率、高胺效率和吸附剂容量，远远超过在模拟烟道气条件下，对于低温二氧化碳吸附剂迄今为止报道的最高值。新的胺固定化化学的显示效率可能为先进的二氧化碳吸附剂以及其他氮功能化系统的开发开辟新途径。
