表面修饰的有机-无机杂化微孔SiO_2膜的制备及氢气分离性能  

Surface Modified Organic-inorganic Hybrid Microporous Silica Membranes for Hydrogen Separation

作　　者：段小勇[1] 韦奇[1] 何俊[1] 闫建平[1] 李群艳[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《高等学校化学学报》2011年第10期2256-2261,共6页Chemical Journal of Chinese Universities

基　　金：国家"八六三"计划项目(批准号:2009AA03Z213)资助

摘　　要：采用苯基三乙氧基硅烷(PTES)和1,2-双(三乙氧基硅基)乙烷(BTESE)为前驱体,通过溶胶-凝胶法制备了苯基修饰的有机-无机杂化SiO2膜材料.通过N2吸附、视频光学接触角测量、热重分析和红外光谱对膜材料的孔结构和疏水性能进行了表征,并深入研究了膜材料的氢气渗透和分离性能.结果表明,修饰后的膜材料具有微孔结构,孔径集中分布在0.4～0.6 nm.在温度为40℃,湿度为70%～80%的水热环境下陈化30 d后,膜材料仍保持微孔结构.苯基修饰后膜材料具有疏水性,当n(PTES)/n(BTESE)=0.6时,膜材料对水的接触角达到(125±0.4)°.氢气在膜材料中的输运遵循活化扩散机理,300℃时,膜材料的H2渗透率达到8.71×10-7mol.m-2.Pa-1.s-1,H2/CO2的理想分离系数达到5.53.Organic-inorganic hybrid silica membranes were prepared by sol-gel method with bridged silsesquioxane[1,2-bis（triethoxysilyl）ethane,BTESE] and phenyltriethoxysilane（PTES） as precursors.The pore structure and hydrophobic property of the hybrid silica membranes were characterized by N2 adsorption,contact angle meter,TG and FTIR.The hydrogen permeation and separation performance was also investigated.The results show that the modified hybrid silica membranes possess a desirable microporous structure with a pore width centered at 0.4—0.6 nm.Such a pore structure can be retained after aging for 30 d under a temperature of 40 ℃ and a relative humidity of 70%—80%.The hybrid silica membranes become hydrophobic after modification,with a water contact angle of（125±0.4）° at a PTES/BTESE molar ratio of 0.6.The transportation of hydrogen in the hybrid silica membranes complies with the activated diffusion mechanism,with a permeance of 8.71×10-7mol·m-2·Pa-1·s-1 and a H2/CO2 permselectivity of 5.53.

关 键 词：有机-无机杂化SiO2膜 苯基 孔结构 氢气分离 

分 类 号：O611[理学—无机化学]