Effect of zirconium doping on hydrogen permeation through strontium cerate membranes / Jay Kniep in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010)  

Effect of zirconium doping on hydrogen permeation through strontium cerate membranes [texte imprimé] / Jay Kniep, Auteur ; Y. S. Lin, Auteur . - 2010 . - pp. 2768–2774.
Industrial Chemistry
Langues : Anglais (eng)
in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2768–2774

Mots-clés :	Zirconium  Doping  Hydrogen  Permeation  Strontium  Cerate  Membranes
Résumé :	SrCe0.95Tm0.05O3−δ perovskite-type ceramic membranes offer high hydrogen selectivity, thermal stability, mixed protonic−electronic conductivity, and mechanical strength at temperatures above 600 °C. However, in order for the SrCeO3-based membranes to be used in industrial applications, the chemical stability of the membranes in various environments must be improved. The effect of doping zirconium on the chemical stability, lattice structure, protonic and electronic conductivity, and hydrogen permeation properties of SrCe0.95−xZrxTm0.05O3−δ (0 ≤ x ≤ 0.40) was studied. X-ray diffraction analysis verifies that all samples consist of a single perovskite phase. Doping zirconium in SrCe0.95Tm0.05O3−δ results in a decrease in both the protonic and electronic conductivity of the materials under reducing conditions, and a more significant decrease in hydrogen permeability of the membrane in CO2 free gas streams. In a CO2-containing environment SrCe0.75Zr0.20Tm0.05O3−δ membranes have a larger steady-state H2 flux and superior chemical stability over SrCe0.95Tm0.05O3−δ membranes.
Note de contenu :	Bibiogr.
ISSN :	0888-5885
En ligne :	http://pubs.acs.org/doi/abs/10.1021/ie9015182