Yihao Nie, Xibin Yi, Xinfu Zhao, Shimo Yu, Jing Zhang, Xiaochan Liu, Sijia Liu, Z. Yuan, Minna Zhang
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引用次数: 1
摘要
通过使用CO2吸附可以降低CO2分离的成本和能耗。聚酰亚胺(PI)由于其网络中的富电子杂原子,对CO2具有显著的亲和力。聚乙二醇(PEG)可以增加聚合物的层间距,从而改变其中CO2的传质。此外,PEG中的醚键(-O-)对CO2具有良好的亲和力。本研究采用温和的溶胶-凝胶法在低温下将PEG-1000引入PI气凝胶中,并利用冷冻干燥制备具有定向孔结构的PI/PEG复合气凝胶。进一步研究了PEG-1000含量和PI/PEG复合气凝胶定向孔结构对CO2吸附性能的影响。L-PI/PEG-4复合气凝胶含有4 g PEG,并在液氮中定向冷冻,在25°C和1巴下具有16.76 cm3/g的CO2吸附能力。L-PI/PEG-4气凝胶还表现出高的CO2/N2选择性和吸附循环稳定性。
Directional porous polyimide/polyethylene glycol composite aerogel with enhanced CO2 uptake performance
The cost of CO2 separation and energy consumption can be decreased through the use of CO2 adsorption. Due to the electron-rich heteroatoms in its network, polyimide (PI) has a remarkable affinity for CO2. Polyethylene glycol (PEG) can increase the layer spacing of polymers, so as to change the mass transfer of CO2 in it. Furthermore, the ether bond (-O-) in PEG has good affinity for CO2. In this study, PEG-1000 was introduced into PI aerogel by mild sol-gel method at low temperature, and freeze-drying was used to produce PI/PEG composite aerogels with directional pore structure. The effect of PEG-1000 content and directional pore structure of the PI/PEG composite aerogels on CO2 adsorption performance were further studied. The L-PI/PEG-4 composite aerogel, which contains 4 g PEG and is directionally frozen in liquid nitrogen, has a CO2 adsorption capacity of 16.76 cm3/g at 25°C and 1 bar. L-PI/PEG-4 aerogel also exhibits high CO2/N2 selectivity and adsorption cycle stability.
期刊介绍:
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