SrCe0.95Yb0.05O3-α hollow-fiber membrane and its property in proton conduction



SrCe0.95Yb0.05O3-α (SCYb) hollow-fiber membranes have been prepared by an immersion-induced phase-inversion/sintering method where polyethersulfone (PESf) is used as a binder, N-methyl-2-pyrrollidone (NMP) as solvent, and polyvinylpyrrolidone (PVP, K16–18) as an additive, respectively. By a programmed sintering process, the hollow-fiber precursor prepared from the phase-inversion technique has been successfully sintered into a dense membrane. A hollow-fiber membrane module has also been fabricated and the hydrogen permeation (proton conduction) properties of the developed SCYb hollow-fiber membranes have been studied under different operating conditions with respect to temperature and hydrogen/oxygen feed concentration. Comparison between experimental data and theoretical results indicates that the surface exchange reactions may contribute some resistances to hydrogen permeation. With the length of the fiber and operating conditions used in this study, the flow patterns show no noticeable effect on the total hydrogen permeation flux. © 2005 American Institute of Chemical Engineers AIChE J, 2006