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@INPROCEEDINGS{Arcon:409610,
      author       = {Arcon, Iztok and Janvit, Terzan and Djinovic, Petar and
                      Maxim, Zabilsky and Albin, Pintar},
      title        = {{O}perando {XAS} analysis of $\mathrm{{C}u{O}/{S}i{O}_{2}}$
                      and $\mathrm{{C}u{O}/{C}e{O}_{2}}$ catalysts},
      reportid     = {PUBDB-2018-03455},
      year         = {2018},
      note         = {Book of abstracts available online at:
                      https://exrs2018.ijs.si/abs/exrs2018-book.pdf},
      abstract     = {The possibilities of the operando XAS analysis of catalysts
                      will be presented on two casestudies of promising new
                      catalytic materials: alkali doped nano-dispersed copper
                      oxideclusters on ordered mesoporous SiO2, which is highly
                      active and selective towards propyleneepoxidation [1], and
                      nanoshaped CuO/CeO2 catalysts used in N2O decomposition
                      reaction [2].Operando Cu K-edge and Ce L3-edge XANES and
                      EXAFS analysis was performed duringcatalytic reactions under
                      controlled reaction conditions in a tubular reactor filled
                      withprotective He atmosphere at 1 bar. The spectra were
                      measured before the reaction at RT, thenduring heating, and
                      during catalytic reaction at 400 °C under controlled
                      atmosphere.Operando XANES analysis is used to monitor the
                      changes in valence states and localsymmetries of Cu and Ce
                      cations in the catalysts. A partial reduction of Cu2+ to Cu+
                      and Cu0and Ce4+ to Ce3+ species was detected during catalyst
                      activation, and re-oxidation duringcatalytic reaction.
                      Different dynamics of reaching a quasi-steady oxidation
                      state were revealedas the tested catalysts approached the
                      quasi-steady state after 300 min of reaction.Operando EXAFS
                      spectra are used to precisely determine local structure of
                      Cu and Cecations, to identify structural characteristics and
                      changes of Cu and Ce species during thecatalytic reactions.
                      In this way, the active site in the catalytic reactions can
                      be identified andthe mechanism of the reaction clarified.The
                      results of operando XAS analyses are crucial to guide
                      further material modification, toobtain more effective
                      catalyst, and material which is more resistant to inhibiting
                      effects thatcause catalyst deactivation during catalytic
                      reaction.},
      month         = {Jun},
      date          = {2018-06-24},
      organization  = {European Conference on X-Ray
                       Spectrometry, Ljubljana (Slovenia), 24
                       Jun 2018 - 29 Jun 2018},
      subtyp        = {Plenary/Keynote},
      cin          = {DOOR},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (POF3-622) / FS-Proposal: I-20160044 EC
                      (I-20160044-EC) / CALIPSOplus - Convenient Access to Light
                      Sources Open to Innovation, Science and to the World
                      (730872)},
      pid          = {G:(DE-HGF)POF3-6G3 / G:(DE-H253)I-20160044-EC /
                      G:(EU-Grant)730872},
      experiment   = {EXP:(DE-H253)P-P65-20150101},
      typ          = {PUB:(DE-HGF)6},
      doi          = {10.3204/PUBDB-2018-03455},
      url          = {https://bib-pubdb1.desy.de/record/409610},
}