Reactivity of oxidized copper surfaces in methanol oxidation

L. Zhou, S. Günther, D. Moszynski, R. Imbihl

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

The reactivity of metallic and oxidized copper surfaces in methanol oxidation was studied in the 10-2 mbar range. Transitions between the metallic surface and the two copper oxides, Cu2O and CuO, are being followed by the color changes of the sample and by ellipsometric measurements. Compared with a metallic copper surface, a partially oxidized copper surface has higher reactivity toward production of formaldehyde, whereas the deeply oxidized surface (CuO) shows a higher activity toward total oxidation to CO 2. Oxidation and reduction of the Cu surface are associated with a strong change in the degree of roughening and with spatial inhomogeneities, as demonstrated by photographic imaging and by ellipsometric microscopy.

Original languageEnglish
Pages (from-to)359-367
Number of pages9
JournalJournal of Catalysis
Volume235
Issue number2
DOIs
StatePublished - 25 Oct 2005
Externally publishedYes

Keywords

  • Copper
  • Copper oxide
  • Ellipsometry
  • Formaldehyde
  • Methanol oxidation
  • Partial oxidation
  • Surface reactivity

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