CTAB-乙烯基修饰合成二氧化硅膜及CH_4/CO_2的分离  

Silica Membranes Synthesized by CTAB-sol Modified Technology and Separation on CH_4/CO_2

作　　者：张志刚[1] 郑立娇[1] 李丹丹[1] 李文秀[1] 

机构地区：[1]沈阳化工大学辽宁省化工分离技术重点实验室,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2014年第4期308-313,共6页Journal of Shenyang University of Chemical Technology

基　　金：国家自然科学基金资助项目(21076126);辽宁省高等学校优秀科技人才支持计划(LR2012013)

摘　　要：以乙烯基三乙氧基硅烷(A-151)和正硅酸乙酯(TEOS)为前驱体,十六烷基三甲基溴化铵(CTAB)为有机模板剂,在酸性条件下通过溶胶-凝胶法制备疏水性Si O2膜,采用IR、XRD、SEM等对膜材料进行表征,并通过激光粒度分析仪对不同醇酯比的溶胶粒径分布进行测试.结果表明:疏水基团已成功修饰到Si O2材料中,加入一定量CTAB后,膜材料具有良好的CH4、CO2气体渗透性能,压差20 k Pa时,CH4/CO2气体的分离因子接近2.27,高于Knudsen扩散理想分离因子1.66,表明膜材料具有一定的分子筛效应.Hydrophobic silica membranes were synthesized by hydrolysis and condensation reaction which TEOS （tetraethylorthosilicate） and A-151 （Triethoxyvinylsilane） reacted in nitric acid by sol-gel method and cationic surfactants CTAB （C19H42NBr） were used in sols preparation. The modified silica membranes were investigated by IR, SEM and XRD. Laser particle sizer was used to test particle size of the sol with the different molar ratio on EtOH/TEOS. The results indicated that hydrophobic group was successfully modified the surface of silica membranes and modified silica membranes had a satisfactory separation performance of CH4 and CO2 after adding moderate CTAB. With the pressure of 20 kPa, the CH4/CO2 separation factor approximate 2.27 which was higher than the theoretical Knudsen value（ CH4/ CO2 ,α = （44/16）1/2 = 1.66） ,so the CH4 and CO2 transport in the modified silica membranes was con- trolled by micropore diffusion mechanism.

关 键 词：溶胶修饰 模板剂 气体分离 

分 类 号：TQ337.1[化学工程—橡胶工业]