Preparation and Gas Permeation of Supported γ-Al_2O_3 Membranes Used as Substrate Layer for Micropor

• 作 者: 韦奇
• 机 构: Department of Materials Science & Engineering, University of Science & Technology of China Hefei 230
• 出 处: Journal of Wuhan University of Technology-Materials Science
• 发表日期: 2005年03期
• 关键词: Substrate permeation sintering ceramic silica sintered chemically porosity amorp

γ-Al_2O_3 membranes were successfully deposited on the top of porous α-Al_2O_3 support by sol-gel process and characterized by means of XRD, SEM,N_2 adsorption and gas permeation. The γ-Al_2O_3 membranes, free of pin-holes and cracks, adhere tightly to the supports and have a thickness of about 7μm. When sintered at 400 ℃, γ-Al_2O_3 membranes have a narrow pore size distribution, with a pore diameter of 3.6nm, and the transport of both H_2 and CO_2 in supported γ-Al_2O_3 membrane is governed by Knudsen mechanism, with H_2 permeance of 3.3×10 -6 molm -2 Pa -1 s -1 and H_2/CO_2 permselectivity close to the ideal Knudsen value at 50 ℃. The γ-Al_2O_3 membranes are suitable for being used as the substrates of microporous membranes.

γ-Al_2O_3 membranes were successfully deposited on the top of porous α-Al_2O_3 support by sol-gel process and characterized by means of XRD, SEM, N_2 adsorption and gas permeation. The γ-Al_2O_3 membranes, free of pin-holes and cracks, When sintered at 400 ° C, γ-Al 2 O 3 membranes have a narrow pore size distribution, with a pore diameter of 3.6 nm, and the transport of both H 2 and CO 2 in supported γ- Al_2O_3 membrane is governed by Knudsen mechanism with H_2 permeance of 3.3 × 10 -6 molm -2 Pa -1 s -1 and H_2 / CO_2 permselectivity close to the ideal Knudsen value at 50 ° C. The γ-Al 2 O 3 membranes are suitable for being used as the substrates of microporous membranes.