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@INPROCEEDINGS{SchulzeKppers:202344,
      author       = {Schulze-Küppers, Falk and Niehoff, Patrick and Baumann,
                      Stefan and Meulenberg, Wilhelm Albert and Guillon, Olivier},
      title        = {{M}anufacturing of oxygen separation membranes in
                      application relevant size},
      reportid     = {FZJ-2015-04608},
      year         = {2015},
      abstract     = {Oxygen transport membranes (OTM) are a promising option to
                      supply oxygen for industrial processes such as syngas
                      production or for high-efficinent carbon capture processes
                      based on oxyfuel combustion. OTM´s consist of a gastight
                      Mixed Ionic Electronic Conductor (MIEC), which possesses
                      infinitive oxygen selectivity, implying a defect-free
                      membrane. At the same time, the oxygen flux in such MIEC
                      membranes increases with decreasing thickness. Typical state
                      of the art membranes consist therefore of a thin membrane
                      layer with a thickness less than 100µm and a porous support
                      for mechanical stability (asymmetric membrane). The support
                      must show a low resistance against gas diffusion, requiring
                      a sufficient high porosity in order not to limit the oxygen
                      permeation.In the present study sequential tape casting is
                      used for manufacturing thin, defect free, supported
                      membranes. To achieve sufficient support porosity and low
                      deflection after co-firing, different pore- forming agents
                      were investigated. With regard to ensure chemical
                      compatibility and to avoid thermal expansion mismatch
                      between support and membrane, both were made from the same
                      material. High performance perovskitic membrane materials
                      were used, i.e. Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) and
                      La0.6-xSr0.4Co0.2Fe0.8O3-δ (LSCF).The oxygen flux trough
                      the membrane can be further increased by pressurizing the
                      outer feed gas, thus also increasing the driving force. The
                      membrane must be able to withstand such pressure, which can
                      be ensured by the usage of tube shaped membranes or flat
                      sandwich membranes consisting of an inner supporting
                      structure covered completely by a dense membrane layer. A
                      cavity is implemented for efficient removal of the permeated
                      oxygen. Such flat components were manufactured from
                      asymmetric membranes in application relevant sizes of
                      approx. 100cm2 by lamination. The laminates can be designed
                      for 4-End Mode, where the permeated oxygen is removed or
                      reacts with a sweep gas. Also a 3-End mode is possible,
                      where permeated pure oxygen is removed by a partial vacuum.
                      Both concepts require a sealing of the open support surface
                      at the components’ edges. In this work, ceramic pastes
                      with a high green density were developed to provide a
                      sufficient densification and gas tightness of the sealed
                      areas after sintering. For a reliable operation of the
                      membrane components, concepts for the formation of ceramic
                      to ceramic and ceramic to steel joints are needed. By using
                      brazes and solders which can withstand oxidizing and
                      reducing atmospheres at the same time, a broad range of
                      applications can be covered. According to this requirement,
                      a full ceramic joining, the connection by reactive air
                      brazing with silver/copper oxide-braze, and the soldering
                      with pure silver was investigated. All these techniques were
                      applied in order to build a first short stack for 3-End
                      operation. Performance of the oxygen flux will be shown and
                      bottlenecks for oxygen transport will be addressed. An
                      outlook for improved membrane components will also be
                      given.},
      month         = {Jun},
      date          = {2015-06-20},
      organization  = {14th International Conference of the
                       European Ceramic Society, Toledo
                       (Spain), 20 Jun 2015 - 26 Jun 2015},
      subtyp        = {After Call},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / GREEN-CC - Graded Membranes for Energy
                      Efficient New Generation Carbon Capture Process (608524) /
                      HITEC - Helmholtz Interdisciplinary Doctoral Training in
                      Energy and Climate Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-113 / G:(EU-Grant)608524 /
                      G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/202344},
}