A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer
A mixed matrix membrane for enhanced CO2/N2 separation via aligning hierarchical porous zeolite with a polyethersulfone based comb-like polymer
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DOI：
10.1016/j.jtice.2021.10.032
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发表时间：
2021-11
影响因子：
5.7
通讯作者：
Yunfei Yu;Chenchen Zhang;Jiufeng Fan;Dongxia Liu;Jianqiang Meng
中科院分区：
文献类型：
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作者：
Yunfei Yu;Chenchen Zhang;Jiufeng Fan;Dongxia Liu;Jianqiang Meng
用于CO2/ n2分离的混合基质膜（MMM）仍然存在界面缺陷。方法利用聚醚砜-g-聚乙二醇（pe -g- peg）梳状共聚物制备了一系列MMMs，以调节其与柱状MFI （PMFI）分子筛纳米片的界面相互作用，该分子筛具有分层多孔结构，可提高渗透性。采用SEM、EDX和XRD对复合膜进行了表征。采用时滞法测定了co2和n2气体渗透率、扩散系数和溶解度系数的依赖关系。结果PMFI沸石负载的增加导致CO2渗透系数的增加，这主要是由于CO2扩散系数的增加引起的。在负载20wt% PMFI沸石的条件下，对CO2/ n2气体分离进行了优化，得到了CO2渗透率为66.9 Barrer，理想渗透率选择系数为9.6的复合膜。
BackgroundMixed matrix membranes (MMM)s for CO2/N2separation still suffer from interfacial defects.MethodTo address this, a series of MMMs were prepared using polyethersulfone-g-poly (ethylene glycol) (PES-g-PEG) comb-like copolymer to tune the interfacial interaction with a pillared MFI (PMFI) zeolite nanosheets, which has a hierarchical porous structure to improve permeance. The composite membranes were examined by SEM, EDX and XRD. The dependence of gas permeabilities, diffusion and solubility coefficients of CO2and N2were determined by the time-lag method.ResultsThe increase in PMFI zeolite loading led to an increase in the permeability coefficient of CO2,which is mainly caused by the increase in CO2diffusion coefficient. The CO2/N2gas separation was optimized at a loading of 20wt% PMFI zeolite, which produces a composite membrane with a CO2permeability of 66.9 Barrer and an ideal permeability selectivity coefficient of 9.6.