以1,2-二(三乙氧基硅基)乙烷(BTESE)和五正丁氧基铌为前驱体,采用聚合溶胶路线,制备出3种粒径分布(平均粒径为5,8,11 nm)的铌掺杂的有机无机杂化SiO2 (Nb-HybridSiO2)聚合溶胶.通过TG/DSC、XRD、CO2吸附和单组分气体渗透实验等手段,详细考察了聚合溶胶粒径对铌掺杂的有机无机杂化SiO2粉体和气体分离膜性能的影响.结果表明:采用平均粒径为5 nm的聚合溶胶,制备得到完整无缺陷的气体分离膜,膜的H2渗透率为8.36×10-8 mol/(m2·s·Pa),H2/CO2的理想分离因子为23.当采用平均粒径大于8 nm的溶胶制膜时,膜的H2/CO2理想分离因子降低.
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