The reaction of formic acid on the (100) surface of yttria-stabilized zirconia was studied using temperatureprogrammed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS). Formic acid adsorbed molecularly at temperatures below 200 K and dissociated upon heating to room temperature to produce adsorbed formate and hydroxyl. Dehydration to CO was the primary pathway for decomposition of adsorbed formates. In addition to the dehydration pathway, a fraction of the adsorbed formates underwent dehydrogenation to C02. Formaldehyde was also detected as a minor product. The influence of surface oxygen defects on the kinetics of formate decomposition was evaluated by comparing TPD results from oxygenannealed and sputtered surfaces.

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The structure and reactivity of Pt films supported on cubic Z r O 2 ( 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 w&e found to grow in a layer-by-layer fashion on the Zr02(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.

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