The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Edvin Lundgren. Portrait.

Edvin Lundgren

Professor

Edvin Lundgren. Portrait.

Formation of Epitaxial PdO(100) During the Oxidation of Pd(100)

Author

  • Vikram Mehar
  • Helen Edström
  • Mikhail Shipilin
  • Uta Hejral
  • Chengjun Wu
  • Aravind Kadiri
  • Stefano Albertin
  • Benjamin Hagman
  • Kim von Allmen
  • Tim Weigmann
  • Sebastian Pfaff
  • Jakub Drnec
  • Johan Zetterberg
  • Edvin Lundgren
  • Lindsay Merte
  • Johan Gustafson
  • Jason Weaver
Show all

Summary, in English

The catalytic oxidation of CO and CH4 can be strongly influenced by the structures of oxide phases that form on metallic catalysts during reaction. Here, we show that an epitaxial PdO(100) structure forms at temperatures above 600 K during the oxidation of Pd(100) by gaseous O atoms as well as exposure to O2-rich mixtures at millibar partial pressures. The oxidation of Pd(100) by gaseous O atoms preferentially generates an epitaxial, multilayer PdO(101) structure at 500 K, but initiating Pd(100) oxidation above 600 K causes an epitaxial PdO(100) structure to grow concurrently with PdO(101) and produces a thicker and rougher oxide. We present evidence that this change in the oxidation behavior is caused by a temperature-induced change in the stability of small PdO domains that initiate oxidation. Our discovery of the epitaxial PdO(100) structure may be significant for developing relationships among oxide structure, catalytic activity, and reaction conditions for applications of oxidation catalysis.

Department/s

  • Synchrotron Radiation Research
  • LU Profile Area: Light and Materials
  • Combustion Physics
  • LTH Profile Area: Photon Science and Technology
  • NanoLund: Centre for Nanoscience

Publishing year

2023-09-18

Language

English

Pages

8493-8499

Publication/Series

The Journal of Physical Chemistry Letters

Volume

14

Issue

38

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Condensed Matter Physics (including Material Physics, Nano Physics)
  • Inorganic Chemistry

Keywords

  • chemical structure
  • epitaxy
  • oxidation
  • oxides
  • surface analysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 1948-7185