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@PHDTHESIS{SchulzeKppers:19317,
      author       = {Schulze-Küppers, Falk},
      title        = {{E}ntwicklung geträgerter
                      {B}a$_{0,5}${S}r$_{0,5}${C}o$_{0,8}${F}e$_{0,2}${O}$_{3-\delta}$
                      {S}auerstoff-{P}ermeationsmembranen},
      volume       = {126},
      school       = {Universität Bochum},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-19317},
      isbn         = {978-3-89336-752-8},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {II, 119 S.},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012; Universität Bochum,
                      Diss., 2011},
      abstract     = {Oxygen Transport Membranes (OTMs) are a promising way of
                      obtaining high-purity oxygen. Compared to conventional
                      methods, membranes require less energy than cryogenic air
                      separation. OTMs consist of gastight, ceramic, mixed
                      ionic-electronic conductors (MIEC) and allow oxygen
                      transport via oxygen vacancies in the crystal lattice.
                      Therefore, the theoretically achievable purity of these OTMs
                      is $100\%.$ The most promising class of materials are the
                      perovskites, which has a high ionic and very high electronic
                      conductivity. The perovskite with the highest oxygen
                      permeability is the
                      Ba$_{0,5}$Sr$_{0,5}$Co$_{0,8}$Fe$_{0,2}$O$_{3-\delta}$
                      (BSCF), which has also been used in this work. Further
                      potential for improvement of the oxygen permeation can be
                      provided by a thin, supported membrane,an optimization of
                      the microstructure of the porous support as well as by the
                      use of porous activation layers on top of the membrane. An
                      aim of the first part of the work is the development of thin
                      membranes on top of a porous support. For this purpose,
                      supports of different porosity and pore size were prepared
                      by tape casting using different pore formers. The thin
                      membrane layers were manufactured by screen printing and
                      tape casting. The preparation of screen-printed membrane
                      layers as well as porous activation layers was carried out
                      on pre-sintered supports respectively sintered membranes.
                      Composite membranes (thin membrane layer and porous support)
                      were prepared by sequential tape casting and subsequent
                      co-firing. Regarding deflection and leakage, the tape cast
                      and co-fired membranes achieved the best results. The
                      influence of membrane microstructure on oxygen permeation
                      has been studied on composite membranes with 26\%, 34\% and
                      41\% support porosity and 20$\mu$m and 70$\mu$m membrane
                      layer thickness. This increase of support porosity as well
                      as the reduction of membrane thickness led to an increase in
                      the oxygen permeation. The increase of the oxygen permeation
                      by decreasing the membrane layer thickness is lower than the
                      Wagner equation would have suggested and this issue will be
                      discussed in this chapter. Ways of reducing the limiting
                      factors are to be sought in the use of porous surface
                      layers, tailoring the support microstructure and in the use
                      of vacuum conditions instead of a sweep gas on the support
                      side. Limiting factors for oxygen transport through the
                      composite membrane were identified and separated by
                      systematic choice of the boundary conditions during
                      permeation measurements. Limiting factors are surface
                      transport processes, concentration polarization in the
                      porous support and the transport through the membrane. From
                      the acquired data, a transport model has been developed to
                      describe the oxygen transport through the composite
                      membrane.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/19317},
}