以三氯化铝为原料制备担载氧化铝超滤膜

A new method using aluminium chloride as precursors by ion exchange sol-gel route for preparation of γ-Al2O3 membranes on α-Al2O3 tube substrate was introduced in this paper. The thermal stability, phase transformation, structure, appearance and pore size distribution of γ-alumina membranes were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscope (FT-IR), Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and nitrogen isothermal absorption measurement. SEM images showed that the membranes were defect-free. Gas permeability test suggested that the obtained membranes possessed gas selectivity, and its separation factor at 0.1 MPa for H2/N2, H2/ CH4 and H2/ CO2 were 3.21,2.23, and 4.11, respectively. The most concentrative pore diameter, pore volume and specific surface area of an unsupported membrane calcinated at 600℃ were 3.7nm, 0.18ml/g and 176.9m2/g, respectively.