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The adsorption of ethene (C 2 H 4 ) has been studied on Pd(111) and ordered Sn/Pd(111) surface alloys using temperature programmed desorption (TPD), ultravioletphotoelectron spectroscopy (UPS), high-resolution electron energy loss spectroscopy (HREELS), and low energy electron diffraction(LEED). Two surface alloys were prepared by thermal treatment of Sn-films, which were vapor deposited on Pd(111) at room temperature.Depending on the preparation conditions, surface alloys giving a p(2×2) or a (√3×√3)R30° LEED pattern were produced. Below 250 K ethene adsorbs on pure Pd(111) in an undissociated – but substantially distorted– form relative to the molecular structure in the gas phase: HREELS suggests an adsorption in the di-σ bonded state. A π-bondedethene species was, however, found to coexist with this strongly rehybridized form, probably as a result of hydrogen coadsorbedfrom the residual gas. TPD and annealing experiments followed by UPS and HREELS indicated that most of the adsorbed ethenedesorbs reversibly in the temperature range between 150 K and 350 K, while a small amount dehydrogenates. After adsorptionat room temperature, ethylidyne (≡CCH 3 ) has been identified as the most important species. Alloying Pd(111) with Sn results in a decreasing ethene-substrate interactionwith increasing Sn-content in the topmost layer of the substrate. Only π-bonded ethene was formed on both surface alloys anddecomposition reactions were suppressed.

The Adsorption of Ethene on Pd(111) and Ordered Sn/Pd(111) Surface Alloys