Processing, stability and oxygen permeability of Sr(Fe, Al)O3-based ceramic membranes

被引:75
作者
Kharton, VV [1 ]
Shaula, AL
Snijkers, FMM
Cooymans, JFC
Luyten, JJ
Yaremchenko, AA
Valente, AA
Tsipis, EV
Frade, JR
Marques, FMB
Rocha, J
机构
[1] Univ Aveiro, CICECO, Dept Ceram & Glass Engn, P-3810193 Aveiro, Portugal
[2] Belarusian State Univ, Inst Physicochem Problems, Minsk 220050, BELARUS
[3] Vlaamse Instelling Technol Onderzoek, Dept Mat, B-2400 Mol, Belgium
[4] Univ Aveiro, CICECO, Dept Chem, P-3810193 Aveiro, Portugal
关键词
ceramic membrane processing; mixed conductor; surface activation; oxygen permeation; ionic transport; methane oxidation;
D O I
10.1016/j.memsci.2004.12.018
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Minor additions of alumina into perovskite-type SrFe0.7Al0.3O3-delta, a composition close to the solid solution formation limits in SrFe1-xAlxO3-delta system, result in decreasing thermal expansion and increasing oxygen permeability. The improved sinterability of SrFe0.7Al0.3O3-based composite with 3 wt.% Al2O3 addition enables to fabricate high-quality tubular membranes for the methane conversion reactors. No essential degradation in the performance of SrFe0.7Al0.3O3-delta membranes under air/CH4 or air/H-2-H2O gradients at 973-1223 K was observed during 200-700h. The stable operation under high oxygen chemical potential gradients is possible due to surface-limited oxygen transport, indicated by the dependencies of oxygen permeability on the membrane thickness. Applying porous layers of the same composition, synthesized via cellulose-precursor technique, onto the permeate-side surface leads to substantially higher oxygen fluxes. For a model reactor with the surface-modified SrFe0.7Al0.3O3-delta membrane and commercial Ni/Al2O3 catalyst, the CH4 conversion rate achieved 90-97% at 1073-1123 K, when the CO selectivity was almost 100%. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:215 / 225
页数:11
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