Catalysis Letters

, Volume 31, Issue 4, pp 333–340

Spectroscopic evidence for adsorption sites located at Cu/ZnO interfaces

  • Julian E. Bailie
  • Colin H. Rochester
  • Graeme J. Millar
Article

DOI: 10.1007/BF00808597

Cite this article as:
Bailie, J.E., Rochester, C.H. & Millar, G.J. Catal Lett (1995) 31: 333. doi:10.1007/BF00808597

Abstract

FTIR spectra are reported of CO and formic acid adsorption on a series of Cu/ZnO/SiO2 catalysts. Peaks due to linear CO adsorbed on copper diminished in intensity as the loading of ZnO was increased. This behaviour was explained in terms of ZnO island growth on the copper surface. Similarly, reduction of the copper concentration while maintaining a constant ZnO loading also resulted in further attenuation in bands ascribed to CO chemisorbed on copper. Formic acid exposure to a Cu/SiO2 sample produced a formate species displaying a νas(COO) mode at 1585 cm−1. Addition of a small quantity of ZnO to the catalyst resulted in substantial promotion of formate growth, which was accompanied by a shift (and broadening) of the νas(COO) vibration to 1660–1600 cm−1. Since further ZnO incorporation poisoned formate creation it was concluded that formate species bonded to Cu and Zn sites located at interfacial positions had been formed. The role of such species in methanol synthesis is discussed.

Keywords

Cu/ZnO/SiO2 catalysts IR adsorbed CO adsorbed formate 

Copyright information

© J.C. Baltzer AG, Science Publishers 1995

Authors and Affiliations

  • Julian E. Bailie
    • 1
  • Colin H. Rochester
    • 1
  • Graeme J. Millar
    • 2
  1. 1.Department of ChemistryUniversity of DundeeDundeeUK
  2. 2.Department of ChemistryUniversity of QueenslandBrisbaneAustralia

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