Topics in Catalysis

, Volume 56, Issue 1, pp 333–338

Oscillatory CO Oxidation Over Pt/Al2O3 Catalysts Studied by In situ XAS and DRIFTS

  • Alexey Boubnov
  • Andreas Gänzler
  • Sabrina Conrad
  • Maria Casapu
  • Jan-Dierk Grunwaldt
Original Paper

DOI: 10.1007/s11244-013-9976-6

Cite this article as:
Boubnov, A., Gänzler, A., Conrad, S. et al. Top Catal (2013) 56: 333. doi:10.1007/s11244-013-9976-6

Abstract

Fresh and mildly aged Pt/Al2O3 model diesel oxidation catalysts with small and large noble metal particle size have been studied during CO oxidation under lean burn reaction conditions to gain more insight into the structure and oscillatory reaction behaviour. The catalytic performance, CO adsorption characteristics using in situ DRIFTS and oxidation state using in situ XAS were correlated. Stable and pronounced oscillations only occurred over the catalyst with smaller particle sizes. Characteristic for this catalyst are low-coordinated surface Pt sites (more corner and edge atoms) which seem to become oxidized at elevated temperature as evidenced by in situ DRIFTS and in situ XAS. In situ XAS further uncovered that the oxidation of the Pt surface starts from the end of the catalyst bed and the oxidation state oscillates like the catalytic activity.

Keywords

Platinum CO oxidation Oscillations In situ DRIFTS In situ XAS Spatially resolved studies 

Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  • Alexey Boubnov
    • 1
  • Andreas Gänzler
    • 2
  • Sabrina Conrad
    • 2
  • Maria Casapu
    • 2
  • Jan-Dierk Grunwaldt
    • 1
  1. 1.Institute for Chemical Technology and Polymer Chemistry (ITCP) and Institute for Catalysis Research and Technology (IKFT)Karlsruhe Institute of Technology (KIT)KarlsruheGermany
  2. 2.Institute for Chemical Technology and Polymer Chemistry (ITCP)Karlsruhe Institute of Technology (KIT)KarlsruheGermany

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