TY - JOUR
T1 - Sensitivity of Material, Microstructure and Operational Parameters on the Performance of Asymmetric Oxygen Transport Membranes
T2 - Guidance from Modeling
AU - Wilkner, Kai
AU - Mücke, Robert
AU - Baumann, Stefan
AU - Meulenberg, Wilhelm Albert
AU - Guillon, Olivier
N1 - Funding Information:
Acknowledgments: Financially supported by the Helmholtz Graduate School for Energy and Climate Research (HITEC) at Forschungszentrum Jülich.
Publisher Copyright:
© 2022 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2022/6/13
Y1 - 2022/6/13
N2 - Oxygen transport membranes can enable a wide range of efficient energy and industrial applications. One goal of development is to maximize the performance by the improvement of the material, microstructural properties and operational conditions. However, the complexity of the transportation processes taking place in such commonly asymmetric membranes impedes the identification of the parameters to improve them. In this work, we present a sensitivity study that allows identification of these parameters. It is based on a 1D transport model that includes surface ex-change, ionic and electronic transport inside the dense membrane, as well as binary diffusion, Knudsen diffusion and viscous flux inside the porous support. A support limitation factor is defined and its dependency on the membrane conductivity is shown. For materials with very high ambipo-lar conductivity the transport is limited by the porous support (in particular the pore tortuosity), whereas for materials with low ambipolar conductivity the transport is limited by the dense mem-brane. Moreover, the influence of total pressure and related oxygen partial pressures in the gas phase at the membrane’s surfaces was revealed to be significant, which has been neglected so far in permeation test setups reported in the literature. In addition, the accuracy of each parameter’s experimental determination is discussed. The model is well-suited to guiding experimentalists in de-veloping high-performance gas separation membranes.
AB - Oxygen transport membranes can enable a wide range of efficient energy and industrial applications. One goal of development is to maximize the performance by the improvement of the material, microstructural properties and operational conditions. However, the complexity of the transportation processes taking place in such commonly asymmetric membranes impedes the identification of the parameters to improve them. In this work, we present a sensitivity study that allows identification of these parameters. It is based on a 1D transport model that includes surface ex-change, ionic and electronic transport inside the dense membrane, as well as binary diffusion, Knudsen diffusion and viscous flux inside the porous support. A support limitation factor is defined and its dependency on the membrane conductivity is shown. For materials with very high ambipo-lar conductivity the transport is limited by the porous support (in particular the pore tortuosity), whereas for materials with low ambipolar conductivity the transport is limited by the dense mem-brane. Moreover, the influence of total pressure and related oxygen partial pressures in the gas phase at the membrane’s surfaces was revealed to be significant, which has been neglected so far in permeation test setups reported in the literature. In addition, the accuracy of each parameter’s experimental determination is discussed. The model is well-suited to guiding experimentalists in de-veloping high-performance gas separation membranes.
KW - binary friction model
KW - MIEC
KW - oxygen transport membrane
KW - porous media
KW - supported membrane
UR - http://www.scopus.com/inward/record.url?scp=85132396496&partnerID=8YFLogxK
U2 - 10.3390/membranes12060614
DO - 10.3390/membranes12060614
M3 - Article
AN - SCOPUS:85132396496
SN - 2077-0375
VL - 12
JO - Membranes
JF - Membranes
IS - 6
M1 - 614
ER -