MFI型分子膜的制备与H_2S/CH_4分离性能

Preparation and H_2S/CH_4 separation performance of MFI type zeolite membrane

采用二次生长法在多孔α-Al_2O_3载体上制备MFI型(ZSM-5和silicate-1)分子筛膜;通过XRD和SEM检测,证明所合成的分子筛膜为致密、交联和无取向的MFI型分子筛膜,厚度为5μm;单组分气体渗透实验检测中,所制备样品膜的N2渗透量均小于10^(-11)mol/(m^2·s·Pa),可认为其无缺陷;同时,考察了样品分子筛膜对H_2S/CH_4混合气的分离效果,在渗透压分别为0.3和0.5 MPa时,silicate-1分子筛膜的H_2S/CH_4的分离因子分别为1.99和4.44,而ZSM-5分子筛膜的CH_4/H_2S的分离因子分别为6.71和12.85。

The MFI（ ZSM-5 and silicate-1） membranes with porous α-Al2O3 substrates were synthesized by secondary growth method. The results of scanning electron microscopy（ SEM） and X-ray diffraction（ XRD）indicate that the membranes with 5 μm thickness are composed of well-intergrown MFI crystals, which completely covers on the α-Al2O3 substrates in random orientation. The gas permeation measurements reveal that the resulting membranes are of high quality with fewnon-zeolitic pores. In addition,the separation properties of H2S/CH4 through the synthesized MFI membranes were investigated. Under the osmotic pressure of 0. 3 and0.5 MPa,the separation factors of H2S/CH4 by silicate-1 zeolite membrane are 1.99 and 4.44,and the separation factors of CH4/H2S by ZSM-5 zeolite membrane are 6.71 and 12.85,respectively.