Journal Article PUBDB-2015-04887

Transient Structures of PdO during CO Oxidation over Pd(100)

(Corresponding author)>Extern* ; >Extern* ; >Extern* ; >Extern* ; DESY* ; DESY* ; DESY* ; DESY* ; >Extern* ; >Extern* ; >Extern*

Soc. Washington, DC

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Abstract: n situ high-energy surface X-ray diffraction was employed to determine the surface structure dynamics of a Pd(100) single crystal surface acting as a model catalyst to promote CO oxidation. The measurements were performed under semirealistic conditions, i.e., 100 mbar total gas pressure and 600 K sample temperature. The surface structure was studied in detail both in a steady gas flow and in a gradually changing gas composition with a time resolution of 0.5 s. The experimental technique allows for rapid reciprocal space mapping providing the complete information on structural changes of a surface with unprecedented time resolution in harsh conditions. Our results show that the (√5 × √5)R27°-PdO(101) surface oxide forms in a close to stoichiometric O$_{2}$ and CO gas mixture as the mass spectrometry indicates a transition to a highly active state with the reaction rate limited by the CO mass transfer to the Pd(100) surface. Using a low excess of O$_{2}$ in the gas stoichiometry, islands of bulk oxide grow epitaxially in the same (101) crystallographic orientation of the bulk PdO unit cell according to a Stranski–Krastanov type of growth. The morphology of the islands is analyzed quantitatively. Upon further increase of the O$_{2}$ partial pressure a polycrystalline Pd oxide forms on the surface.


Note: (c) American Chemical Society

Contributing Institute(s):
  1. DOOR-User (DOOR)
Research Program(s):
  1. 6213 - Materials and Processes for Energy and Transport Technologies (POF3-621) (POF3-621)
  2. 6214 - Nanoscience and Materials for Information Technology (POF3-621) (POF3-621)
  3. 6G3 - PETRA III (POF3-622) (POF3-622)
  1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2015
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Medline ; OpenAccess by Embargoed OpenAccess ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection
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 Record created 2015-11-18, last modified 2017-02-11

Published on 2015-06-10. Available in OpenAccess from 2016-06-10.:
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