Preparation and characterization of tubular porous silicon carbide membrane supports

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• 作者：You Zhou^a ; ^{you.zhou@aist.go.jp} ; Manabu Fukushima^a ; Hiroyuki Miyazaki^a ; Yu-ichi Yoshizawa^a ; Kiyoshi Hirao^a ; Yuji Iwamoto^b ; Koji Sato^c
• 关键词：Hydrogen separation ; Porous ceramic membrane reactor ; Membrane support ; Silicon carbide ; Tubular membrane
• 刊名：Journal of Membrane Science
• 出版年：2011
• 出版时间：1 March 2011
• 年：2011
• 卷：369
• 期：1-2
• 页码：112-118
• 全文大小：1082 K

文摘

Starting from a submicron β-SiC powder doped with 3 wt % of Al₂O₃ additive, SiC tubes with an outer diameter of 6 mm, an inner diameter of 4 mm and lengths over 500 mm were formed by extrusion and sintered at temperatures ranging from 1800 to 1900 °C. All the sintered tubes had homogeneous and defect-free microstructures. The tubes sintered at 1800, 1850 and 1900 °C had porosities of 45.7 % , 42.1 % and 40.4 % , pore sizes of 0.19, 0.22 and 1.70 μm, radial crushing strengths of 47, 62 and 110 MPa, respectively. Their gas (N₂, He and H₂) permeance values were around 10⁻⁶ to 10⁻⁵ mol m⁻² s⁻¹ Pa⁻¹. The tubes showed no strength degradation and limited oxidation during the water vapor corrosion test at 800 °C for 100 h. The defect-free structure, high porosity, high strength, high gas permeance and good water vapor corrosion resistance make these porous SiC tubes promising supports for hydrogen separation membranes.