在不锈钢网上快速制备连续致密Silicalite-1分子筛膜

Quick Fabrication of Continuous and Compact Silicalite-1 Membrane on Stainless Steel Net

开发了一种在不锈钢网基底上快速制备连续致密Silicalite-1(Si-MFI)分子筛膜的新方法.该制膜过程包括用含有聚氧乙烯(PEO)高分子的氧化硅溶液对不锈钢网基底进行预处理和在预处理后的基底上用二次生长法制备分子筛膜2个步骤.通过该方法可在12 h内制备连续致密的不锈钢网支撑的Si-MFI分子筛膜.SEM分析结果表明,所制备的Si-MFI分子筛膜连续且致密,而XRD分析结果表明,膜中的Si-MFI微晶具有高结晶度.用膜渗透分离装置及气相色谱仪测试了Si-MFI膜的渗透性能及对CO2和N2的分离性能,结果显示,该Si-MFI膜具有很好的渗透性能,并对CO2和N2具有很好的分离性能.

A new method for quick fabrication of continuous and compact silicalite-1 （Si-MFI） membrane on stainless steel net was developed. The method consists of pre-treatment of substrate of stainless steel net with silica solution containing polyethylene oxide（PEO） polymer and a secondary growth process. The continuous and compact Si-MFI membranes were obtained within 12 h. The membrane was further characterized by scanning electron microscopy （SEM） and X-ray diffraction （XRD） analyses. SEM analyses show that the membrane is continuous and highly compact. XRD analyses suggest that the micro-crystals embedded in the mem- brane are well crystallized. The permeance and separation performance of the Si-MFI membrane were exa- mined with a gas-separation setup combining a gas chromatography. The results show that the Si-MFI mem- brane has an excellent permeance and separation performance for CO2 and N2.