Abstract
High-resolution electron energy loss spectroscopy (EELS) and temperature programed thermal desorption spectroscopy (TPDS) were applied in studying adsorption and reaction processes of ethylene and ethylene coadsorbed with atomic oxygen on Pt(111). Ethylene rehybridizes upon adsorption below room temperature, forming a di-σ like bond to the surface. At about 300 K ethylene converts successively to ethylidyne (CH3C). When the formation reaction of this species has finished a complex diffraction pattern of a well ordered overlayer is seen. distinctly different from the (2 × 2) structure that hitherto was attributed to CH3C. In the presence of atomic oxygen the reaction of ethylene differs significantly. Weakly bonded ethylene is observed in TPDS when sufficient amounts of ethylene are adsorbed. By EELS this weakly bonded ethylene can be correlated with π-bonded ethylene species coexisting with the di-σ bonded phase. At about 250 K the ethylene begins to decompose: first by hydrogen and water desorption, afterwards by complete combustion to CO2 and H2O. No ethylidyne is formed in the presence of adsorbed oxygen at any stage of the reaction process. Also no indication for reaction intermediates containing carboxyl or hydroxyl groups was found.
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