Characterization of the surface acid-base properties of metal oxides by titration/displacement reactions Academic Article uri icon

abstract

  • The relative acidities of a series of Br√łnsted acids were determined by the method of titration/displacement reactions on powdered samples of ZnO and MgO. Relative adsorbate coverages were determined by FTIR spectroscopy. In contrast to previous results obtained on the Ag(110) surface, the relative acidity scales on the oxides were in better agreement with aqueous dissociation constants than with the gas-phase acidity scale. These results may be explained on the basis of modification of the gas-phase acidities by stabilization of the charge on conjugate base anions by interaction with surface cation sites. The relative magnitudes of these interactions are consistent with trends suggested by the principles of hard and soft acid-base interactions. ¬© 1986 American Chemical Society.

author list (cited authors)

  • Spitz, R. N., Barton, J. E., Barteau, M. A., Staley, R. H., & Sleight, A. W.

citation count

  • 50

publication date

  • August 1986