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@ARTICLE{Li:155932,
      author       = {Li, H. and Schygulla, U. and Hoffmann, J. and Niehoff, P.
                      and Haas-Santo, K. and Dittmeyer, R.},
      title        = {{E}xperimental and modeling study of gas transport through
                      composite ceramic membranes},
      journal      = {Chemical engineering science},
      volume       = {108},
      issn         = {0009-2509},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2014-04862},
      pages        = {94 - 102},
      year         = {2014},
      abstract     = {Concerning the gas transport through ceramic membranes,
                      insufficient attention is paid to concentration polarization
                      (mass transfer) in the measuring cell or module used and to
                      support effects. Therefore, the aim of this study is to
                      demonstrate these effects based on a combined experimental
                      and modeling study of two types of membranes. The gas
                      permeation through a graded ceramic microporous membrane
                      consisting of α-Al2O3/γ-Al2O3/silica was well simulated
                      with the “Binary-Friction-Model” (α-Al2O3/γ-Al2O3
                      substrate) and the Maxwell–Stefan model (silica
                      top-layer), respectively. For both the α-Al2O3 support and
                      γ-Al2O3 interlayer, the geometric factors, such as the pore
                      radius (r), and the ratio of porosity versus tortuosity
                      (ε/τ) obtained from single gas permeation agree well with
                      physical characterizations. Knudsen diffusion is the
                      dominant transport mechanism through both the α-Al2O3
                      support and γ-Al2O3 interlayer and the support effect
                      cannot be neglected due to significant contributions of
                      transport resistance.For the asymmetric BSCF membrane the
                      comparison of experimental data and gas transport simulation
                      using the “Binary-Friction-Model” and the “Wagner
                      equation” coupled to a 2D fluent simulation to account for
                      the local variations of oxygen concentration and gas
                      velocities profiles show a deviation by a factor of ca. 2.
                      The oxygen concentration profile and the gas velocity
                      profile derived from 2D fluent clearly pointed out the
                      concentration polarization effect, which resulted in a
                      permeation reduction up to ca. $20.3\%.$ The porous support
                      exerts a great influence on the gas transport through the
                      asymmetric BSCF membrane. With increasing sweep flow rates,
                      the effect of concentration polarization is less pronounced,
                      while the gas transport through dense and support layer
                      become more important.},
      cin          = {IEK-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {122 - Power Plants (POF2-122) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-122 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000332392100010},
      doi          = {10.1016/j.ces.2013.12.030},
      url          = {https://juser.fz-juelich.de/record/155932},
}