物理化学学报2011，Vol.27Issue(1)：241-247,7.
有机功能化α-Al2O3陶瓷中空纤维表面合成高性能分离氢用NaA分子筛膜
High Performance NaA Zeolite Membrane for Hydrogen Separation Synthesized on an Organic-Functionalized α-Al203 Ceramic Hollow Fiber Surface
摘要
Abstract
Positively charged organic-functionalized α-Al2O3 ceramic hollow fiber was obtained by dip-coating the substrate with a 3-aminopropyl-(diethoxy)methylsilane (ADMS) solution.Negatively charged NaA zeolite particles were deposited on the substrate surface and used as seed for further secondary growth by the electrostatic adsorption of a positively charged organic-functionalized substrate and NaA zeolite particles.The NaA zeolite membrane was synthesized on a porous α-Al2O3 ceramic hollow fiber support by the microwave heating-secondary growth method.The as-synthesized NaA zeolite membranes were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), zeta potential, and gas permeation tests.The differences in morphology, structure, and gas permeability between the NaA zeolite and the ADMS-modified substrate supported NaA zeolite membrane were determined.XRD results show that only NaA zeolite is present on the support.The zeta potential results indicate that opposite charges exist between the NaA zeolite seed or precursor and the organic functionalized substrate surface, which confirms the electrostatic adsorption between them.SEM images show that a smooth and dense membrane (5 μm thick) is obtained and the particles are twinborn by good intergrowth on the ADMS-modified substrate supported NaA zeolite membrane surface.Gas permeation tests with H2, O2, N2, and C3H8 at different temperatures show that the permeability of H2 on the ADMS-modified substrate supported NaA zeolite membrane at 35 ℃ is 3.6×10-7 mol·m-2·s-1·Pa-1, which is lower than that (4.0×10-7 mol·m-2·s-1·Pa-1) of the NaA zeolite membrane.The ideal permselectivity of H2/C3H8 is 11.25, which is far higher than that (5.06) of the NaA zeolite membrane.关键词
中空纤维/有机功能化/NaA分子筛膜/微波加热/氢气分离分类
化学化工引用本文复制引用
陈华荣,常然然,李莉,袁文辉..有机功能化α-Al2O3陶瓷中空纤维表面合成高性能分离氢用NaA分子筛膜[J].物理化学学报,2011,27(1):241-247,7.基金项目
国家自然科学基金(20976057)资助项目 （20976057）
