Goeppert Alain, Zhang Hang, Sen Raktim, Dang Huong, Prakash G K Surya
Loker Hydrocarbon Research Institute and Department of Chemistry, University of Southern California, University Park, Los Angeles, California, 90089-1661, USA.
ChemSusChem. 2019 Apr 23;12(8):1712-1723. doi: 10.1002/cssc.201802978. Epub 2019 Apr 1.
CO adsorbents based on the reaction of pentaethylenehexamine (PEHA) or tetraethylenepentamine (TEPA) with propylene oxide (PO) were easily prepared in "one pot" by impregnation on a silica support in water. The starting materials were readily available and inexpensive, facilitating the production of the adsorbents on a large scale. The prepared polyamine/epoxide adsorbents were efficient in capturing CO and could be regenerated under mild conditions (50-85 °C). They displayed a much-improved stability compared with their unmodified amine counterparts, especially under oxidative conditions. Leaching of the active organic amine became minimal or nonexistent after treatment with the epoxide. The adsorption as well as desorption kinetics were also greatly improved. The polyamine/epoxide adsorbents were able to capture CO from various sources including ambient air and indoor air with CO concentrations of only 400-1000 ppm. The presence of water, far from being detrimental, increased the adsorption capacity. Their use for indoor air quality purposes was explored.
基于五乙烯六胺（PEHA）或四乙烯五胺（TEPA）与环氧丙烷（PO）反应的CO吸附剂，通过在水中浸渍到二氧化硅载体上，很容易“一锅法”制备。起始原料容易获得且价格低廉，有利于大规模生产吸附剂。制备的聚胺/环氧化物吸附剂在捕获CO方面效率很高，并且可以在温和条件（50-85°C）下再生。与未改性的胺类吸附剂相比，它们的稳定性有了很大提高，尤其是在氧化条件下。用环氧化物处理后，活性有机胺的浸出变得极少或不存在。吸附和解吸动力学也有了很大改善。聚胺/环氧化物吸附剂能够从包括环境空气和室内空气在内的各种来源捕获CO，CO浓度仅为400-1000 ppm。水的存在非但无害，反而增加了吸附容量。还探索了它们在室内空气质量方面的用途。
