TY - JOUR

T1 - Influence of Mo-doping on structure and oxygen permeation properties of SrCo0.8−xFe0.2MoxO3-Δ perovskite membranes for oxygen separation

AU - Bragina, O. A.

AU - Nemudry, A. P.

PY - 2017/10/1

Y1 - 2017/10/1

N2 - The effect of cobalt substitution by highly charged Mo6+ cations in SrCo0.8Fe0.2O3-δ (SCF) on the structure, microstructure, oxygen permeation performance and stability in the atmosphere containing carbon dioxide was systematically investigated by XRD, HT-XRD, Mossbauer spectroscopy, oxygen release technique and oxygen permeation experiments. The decrease in oxygen stoichiometry of SrCo0.8-xFe0.2MoxO3-δ (SCFM) materials was accompanied by nanostructuring with observed formation of nanosized domains with ordered oxygen vacancies. Equilibrium “3−δ−lg pO2−T” diagrams showed that SCF doping by molybdenum leads to broadening of the P1 (cubic perovskite phase) stability region. The obtained SCFM membrane materials possess improved phase stability in the intermediate temperature range (T < 700 °C) and low oxygen partial pressure (pO2 < 0.06 atm) compared to the undoped SCF oxide. The observed non-Arrhenius dependence of oxygen fluxes across SCFM disc membranes is related to combined control by bulk diffusion and surface exchange reactions.

AB - The effect of cobalt substitution by highly charged Mo6+ cations in SrCo0.8Fe0.2O3-δ (SCF) on the structure, microstructure, oxygen permeation performance and stability in the atmosphere containing carbon dioxide was systematically investigated by XRD, HT-XRD, Mossbauer spectroscopy, oxygen release technique and oxygen permeation experiments. The decrease in oxygen stoichiometry of SrCo0.8-xFe0.2MoxO3-δ (SCFM) materials was accompanied by nanostructuring with observed formation of nanosized domains with ordered oxygen vacancies. Equilibrium “3−δ−lg pO2−T” diagrams showed that SCF doping by molybdenum leads to broadening of the P1 (cubic perovskite phase) stability region. The obtained SCFM membrane materials possess improved phase stability in the intermediate temperature range (T < 700 °C) and low oxygen partial pressure (pO2 < 0.06 atm) compared to the undoped SCF oxide. The observed non-Arrhenius dependence of oxygen fluxes across SCFM disc membranes is related to combined control by bulk diffusion and surface exchange reactions.

KW - Ceramic membrane

KW - Doping

KW - Mixed conductor

KW - Oxygen permeation

KW - Perovskite

KW - OXIDE

KW - PERMEABILITY

KW - CONVERSION

KW - STABILITY

KW - FEATURES

KW - TRANSPORT

KW - METHANE

KW - TRANSITIONS

KW - CATALYSTS

KW - COBALT

UR - http://www.scopus.com/inward/record.url?scp=85020684959&partnerID=8YFLogxK

U2 - 10.1016/j.memsci.2017.06.018

DO - 10.1016/j.memsci.2017.06.018

M3 - Article

AN - SCOPUS:85020684959

VL - 539

SP - 313

EP - 319

JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

ER -