优先渗透CO2的TS-1／C杂化功能炭膜的制备研究

Preperation of TS-1/C composite functional membrane with high CO_2 permeability and selectivity

以PMDA-ODA型聚酰胺酸为原料,通过掺杂钛硅分子筛(TS-1)制备气体分离用杂化功能炭膜.系统考察了钛硅分子筛(TS-1)掺杂量、炭化温度等因素对功能炭膜气体渗透性和分离性能的影响,利用FT-IR、XRD、TG和TEM等分析手段对TS-1/C杂化原膜及其在不同温度下炭化的炭膜结构和性能进行表征.结果表明:掺杂钛硅分子筛(TS-1)可大幅提高炭膜对CO2的渗透性能;当掺杂质量分数为20%,炭化温度为600℃时,CO2、H2、O2、N2、CH4的渗透系数分别可达9 087Barrer、8 111Barrer、2 017Barrer、426Barrer和357Barrer;当炭化温度为700℃以上时,功能炭膜对各气体的渗透性急剧降低,气体分离性大幅提高.

A novel composite functional carbon membrane for gas separation is designed and prepared by incorporating TS-1 nanoparticles into the thermosetting resins PMDA-ODA. The effects of the content of the TS-1 and pyrolysis temperatures on the permeability and selectivity performance of the functional carbon membranes are studied. The synthesized membranes are also characterized with TG, FT-IR, TEM and XRD. The results show that the addition of the TS-1 nanoparticles influences the performance of the membranes a lot, especially to the absorbable gas CO2, whose permeability is increased most. The perme- abilities of membranes doping with mass fraction 20% TS-1 and carbonized at 600 ℃ for pure gas CO2, H2 ,O2 ,N2,CH4 are 9087,8111,2017,426 and 357 Barrer, respectively. When the membranes are carbonized in temperature above 700℃, the permeabilities of the membranes for all the gases exhibite a drastic drop, while the selectivities are much improved.