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  • 2017
  • swepub:Mat__t
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  • L. Bergman, Susanna, et al. (author)
  • In-situ characterization by Near-Ambient Pressure XPS of the catalytically active phase of Pt/Al2O3 during NO and CO oxidation
  • 2018
  • In: Applied Catalysis B. - Amsterdam : Elsevier. - 0926-3373 .- 1873-3883. ; 220, s. 506-511
  • Journal article (peer-reviewed)abstract
    • This study concerns near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) studies of a Pt/Al2O3 diesel oxidation catalyst used in exhaust aftertreatment. We apply the technique to an industrial-grade porous catalyst, thus bridging both the pressure and materials gap, and probe the shift in binding energy of Pt 4d under different atmospheres. We observe that oxidizing atmospheres induce a shift in binding energy, corresponding to changes in Pt oxidation state, especially pronounced under an atmosphere of NO and O2. Such changes in Pt oxidation state have previously been linked to dynamic changes in NO oxidation activity.
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