Structure sensitivity, selectivity, and adsorbed intermediates in the reactions of acetone and 2-propanol on the polar surfaces of zinc oxide Academic Article uri icon

abstract

  • The reactions of 2-propanol and acetone on the (0001)-Zn and (0001)-O polar surfaces of zinc oxide were investigated by using temperature-programmed desorption and X-ray photoelectron spectroscopy. 2-Propanol adsorbed dissociatively on the (0001)-Zn surface to form surface isopropoxide ((CH3)2HCO) species. These alkoxide intermediates underwent both dehydration and dehydrogenation reactions to produce propylene and acetone. Acetone dissociated on the (0001)-Zn surface to form enolate intermediates, fingerprinted by a broad envelope in the C(1s) spectrum. These enolates decomposed unselectively above 600 K to deposit carbon, which was oxidized to CO and CO2 at higher temperatures. Neither acetone nor 2-propanol reacted on the oxygen polar surface, and both were adsorbed molecularly and desorbed intact from this surface below 300 K. © 1991 American Chemical Society.

author list (cited authors)

  • Vohs, J. M., & Barteau, M. A.

citation count

  • 42

publication date

  • January 1991