MFI型分子膜的制备与H2S/CH4分离性能

采用二次生长法在多孔α-Al₂O₃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5 μm；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/（m²·s·Pa），可认为其无缺陷；同时，考察了样品分子筛膜对H₂S/CH₄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H₂S/CH₄的分离因子分别为1.99和4.44，而ZSM-5分子筛膜的CH₄/H₂S的分离因子分别为6.71和12.85。

Preparation and H2S/CH4 separation performance of MFI type zeolite membrane

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 few non-zeolitic pores. In addition, the separation properties of H₂S/CH₄ through the synthesized MFI membranes were investigated. Under the osmotic pressure of 0.3 and 0.5 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.