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@PHDTHESIS{Thaler:850283,
      author       = {Thaler, Florian},
      title        = {{D}er {E}influss von {W}asserdampf auf den
                      {S}auerstofftransport in keramischen
                      {H}ochtemperaturmembranen},
      volume       = {430},
      school       = {RWTH Aachen},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2018-04325},
      isbn         = {978-3-95806-340-2},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {ii, 93, XXXI S.},
      year         = {2018},
      note         = {RWTH Aachen, Diss., 2018},
      abstract     = {Ceramic high temperature oxygen transport membranes (OTMs)
                      represent a promising alternative for the extraction of
                      oxygen from ambient air compared to conventional high-energy
                      intensive processes like cryogenic air separation.
                      Especially materials with a mixed ionic and electronic
                      conductivity (MIEC) are of current interest as O$^{2-}$-ion
                      conductors. The high number of vacancies and the high
                      mobility for electrons at sufficient high temperature and
                      partial pressure gradient, enables these materials to
                      transport oxygen via the crystal lattice and achieve a 100\%
                      selectivity. Due to their high conductivities, mostly
                      perovskites or a combination of fluorite- and spinel-phases
                      are used as OTM-materials. Depending on the application,
                      OTMs can be used either directly for the oxygen production
                      or in a so-called membrane reactor where chemical reactions
                      are controlled by selective oxidation of particular
                      reactants. This work examines the so-called
                      "oxyfuel-combustion", where fossil fuels like coal are
                      combusted under pure oxygen atmosphere in a power plant, to
                      reduce NOx-emissions and make the combustion more efficient.
                      A OTM-module implemented in the power plant should provide
                      the needed amount of oxygen. The flue gas of such a oxyfuel
                      power plant consist, except for H$_{2}$O and traces of
                      SO$_{2}$, of a pure CO$_{2}$-stream which can be directly
                      used for Carbon Dioxide Capture and Storage. To reduce the
                      high temperatures occurring in the oxyfuel-combustion and to
                      flush the oxygen from the membrane module, usually recycled
                      flue gas is used. Unfortunately some of the most promising
                      OTMmaterials show degradations facing CO2 and CO from the
                      flue gas. Therefore a new concept was invented, where water
                      vapor is used to sweep the membrane instead of the
                      aggressive flue gas. On this point the current work deals
                      with lab-scale experiments on different membrane materials
                      in a permeation measurement setup with humidied sweep gas.
                      Several OTM-materials are investigated concerning their
                      long-term stability and the degradation of the permeation
                      performance while using different amounts of water vapor in
                      the sweep. All tested materials show a decreasing permeation
                      rate for oxygen with increasing water content. The reason
                      for this declined performance can be explained by
                      miscellaneous materials corrosion and degradation
                      mechanisms, which are discussed in the results part.},
      cin          = {IEK-2},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/850283},
}