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@INPROCEEDINGS{Hofmann:168942,
      author       = {Hofmann, G. and Rochet, A. and Baier, S. and Casapu, M. and
                      Ritter, S. and Wilde, F. and Ogurreck, M. and Beckmann, F.
                      and Grunwaldt, J-D},
      title        = {{A}geing {E}ffects on {E}xhaust {G}as {C}atalysts:
                      {M}icroscopic {C}hanges {C}aptured by {X}-{R}ay
                      {T}omography},
      journal      = {Journal of physics / Conference Series},
      volume       = {499},
      number       = {conference 1},
      issn         = {1742-6596},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {DESY-2014-02743},
      series       = {Journal of Physics: Conference Series},
      pages        = {012017},
      year         = {2014},
      abstract     = {In this work we examine the different aspects of catalyst
                      ageing with effects ranging from the nano to the macro
                      scale. Underlining the general importance of combining
                      different characterisation techniques, like transmission
                      electron microscopy (TEM), X-ray absorption spectroscopy
                      (XAS) and X-ray diffraction (XRD) for the nanoscale, we
                      focus on the application of X-ray absorption micro-computed
                      tomography (micro-CT) to capture macroscopic changes in the
                      um to mm scale. Two series of tomographic measurements were
                      carried out: (i) investigation of three differently treated
                      samples by collecting one channel from a fresh, a
                      conditioned and an aged monolith and (ii) examination of one
                      single coated honeycomb channel with 4 $wt\%$ Pt/γ-Al2O3
                      and for comparison one with pure γ-Al2O3 washcoat, which
                      have been measured in a non-destructive ex situ manner at
                      the same position after each ageing treatment.Main
                      observations of the tomographic study are: (1) coating
                      inhomogeneities between different channels taken from the
                      same honeycomb and between different honeycombs, (2)
                      formation of cracks in the washcoat material and (3)
                      formation of macroscopic Pt particles in the case of 4
                      $wt\%$ Pt/γ-Al2O3 washcoat. Particularly valuable is the
                      non-destructive ex situ investigation after different ageing
                      steps on the same channel using X-ray tomography.},
      month         = {Sep},
      date          = {2013-09-02},
      organization  = {International Congress on X-Ray Optics
                       and Microanalysis, Hamburg (Germany), 2
                       Sep 2013 - 6 Sep 2013},
      cin          = {HZG / DOOR},
      ddc          = {530},
      cid          = {I:(DE-H253)HZG-20120731 / I:(DE-H253)HAS-User-20120731},
      pnm          = {PETRA Beamline P05 (POF2-54G14)},
      pid          = {G:(DE-H253)POF2-P05-20130405},
      experiment   = {EXP:(DE-H253)P-P05-20150101},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)16},
      UT           = {WOS:000338041300017},
      doi          = {10.1088/1742-6596/499/1/012017},
      url          = {https://bib-pubdb1.desy.de/record/168942},
}