SELECTIVITY, AND ADSORBED INTERMEDIATES IN THE REACTIONS OF ACETONE AND 2-PROPANOL ON THE POLAR SURFACES OF ZINC-OXIDE STRUCTURE SENSITIVITY

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.

STRUCTURE SENSITIVITY, SELECTIVITY, AND ADSORBED INTERMEDIATES IN THE REACTIONS OF ACETONE AND 2-PROPANOL ON THE POLAR SURFACES OF ZINC-OXIDE Academic Article