INTERACTION OF CO WITH PT SUPPORTED ON ZRO2(100) - EVIDENCE FOR CO ADSORBED AT THE PT-ZRO2 INTERFACE

The structure and reactivity of Pt films supported on cubic ZrO2(100) surfaces were studied using a combination of Auger electron spectroscopy (AES), temperature-programmed desorption (TPD), and high-resolution electron energy loss spectroscopy (HREELS). Pt films deposited from the vapor phase were found to grow in a layer-by-layer fashion on the ZrO2(100) surface at 300 K. Heating to temperatures in excess of 700 K caused the Pt films to agglomerate into particles. CO was found to adsorb in both Linear on top and twofold bridging configurations on the two-dimensional supported Pt films. In contrast, on supported Pt particles, in addition to linear on top species, HREEL spectra provided evidence for CO adsorption sites at the Pt-ZrO2(100) interface.