The interaction of ethylene with the H-preadsorbed PD(110) surface has been studied using thermal desorption spectroscopy and high-resolution electron-energy-loss spectroscopy. On the Pd(110) (2×1)-H surface saturated with ethylene at 90 K, weakly adsorbed ethylene exists in addition to the π-bonded ethylene. The fractional saturation coverage of ethylene is 0.58 (which is nearly equal to that on the Pd(110) clean surface). The H-preadsorption does not markedly block the ethylene postadsorption. The formation of ethane is greatly promoted by the presence of the preadsorbed hydrogen.
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