Sensitivity of Material, Microstructure and Operational Parameters on the Performance of Asymmetric Oxygen Transport Membranes: Guidance from Modeling

Membranes, vol. 12, pp. 614

Abstract

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 exchange, 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 ambipolar 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 membrane. 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 developing high-performance gas separation membranes.

Authors 5

1. Kai Wilkner corresponding Aachen Department of Ceramics and Refractory Materials Institute of Mineral Engineering (GHI)

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   Department of Ceramics and Refractory Materials, Institute of Mineral Engineering, RWTH Aachen University, D-52064 Aachen, Germany

   Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany

   Jülich Aachen Research Alliance: JARA-Energy, D-52425 Jülich, Germany

2. Robert Mücke

   Forschungszentrum Jülich · Jülich Aachen Research Alliance

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany

   Jülich Aachen Research Alliance: JARA-Energy, D-52425 Jülich, Germany

3. Stefan Baumann

   Forschungszentrum Jülich · Jülich Aachen Research Alliance

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany

   Jülich Aachen Research Alliance: JARA-Energy, D-52425 Jülich, Germany

4. Wilhelm Albert Meulenberg

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · University of Twente

   Affiliation as printed

   Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany

   Inorganic Membranes, Faculty of Science and Technology, University of Twente, 7500 AE Enschede, The Netherlands

   Jülich Aachen Research Alliance: JARA-Energy, D-52425 Jülich, Germany

5. Olivier Guillon Aachen Department of Ceramics and Refractory Materials Institute of Mineral Engineering (GHI)

   Forschungszentrum Jülich · Jülich Aachen Research Alliance · RWTH Aachen University

   Affiliation as printed

   Department of Ceramics and Refractory Materials, Institute of Mineral Engineering, RWTH Aachen University, D-52064 Aachen, Germany

   Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Materials Synthesis and Processing (IEK-1), D-52425 Jülich, Germany

   Jülich Aachen Research Alliance: JARA-Energy, D-52425 Jülich, Germany