聚合溶胶粒径对铌掺杂的有机无机杂化SiO_2膜气体分离性能的影响  

Effect of polymeric sol size on gas separation properties of Nb-Hybrid SiO_2 membranes

作　　者：林丹丹[1] 宋华庭 朱瓌之 陈加伟[1] 漆虹[1] 

机构地区：[1]南京工业大学膜科学技术研究所材料化学工程国家重点实验室,南京210009

出　　处：《膜科学与技术》2016年第1期23-29,共7页Membrane Science and Technology

基　　金：国家自然科学基金(21276123;21490581);科技部"863"项目(2012AA03A606);江苏省"六大人才高峰"项目;江苏高校优势学科建设工程资助项目

摘　　要：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5,8,11nm)的铌掺杂的有机无机杂化SiO2(Nb-Hybrid SiO2)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5nm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8nm的溶胶制膜时,膜的H2/CO2理想分离因子降低.Three Nb-Hybrid SiO2 sols （the average size is 5 nm, 8 nm, 11 nm, respectively） were successfully synthesized via polymeric route with 1, 2-bis（triethoxysilyl） ethane （BTESE） and niobium penta（n） butoxide as precursors. The effect of polymeric sol size on single gas permeability was investigated in detail. The properties of Nb-Hybrid SiO2 powders, as well as Nb-Hybrid SiO2 membranes were characterized by thermogravimetric and differential scanning calorimeter, X-ray diffraction, carbon dioxide adsorption and gas separation test. Results showed that a defect-free Nb-hybrid silica membrane was fabricated by using the sol with an average size of 5 nm. Single hydrogen permeance and H2/CO2 permseleetivity of this membrane was 8. 36 × 10^-8 mol/（m2· s ·Pa） and 23, respectively. The reduced H2/CO2 permselectivity of NS membranes was observed, which were prepared by using so!s with average sizes larger than 8 nm.

关 键 词：铌掺杂有机无机杂化SiO2膜 溶胶-凝胶法 溶胶粒径 气体分离 

分 类 号：TQ051.893[化学工程]