Abstract
Previous studies of ethylene adsorption and decomposition on a Ni(110) single crystal surface have been extended to measurement of the interaction of oxygen molecular beams with the carbonaceous layers formed in the ethylene adsorption process. A combination of Auger electron spectrometric and modulated molecular beam techniques have been used to measure the kinetics of oxygen adsorption and CO production on the surface. Results for oxygen adsorption on the clean Ni(110) surface are in agreement with previous studies. For the surface formed by adsorbing ethylene on the clean nickel surface at room temperature, room temperature adsorption of oxygen results in formation of a surface layer of NiO without removal of carbon from the surface. Heating the layer formed at room temperature above 500 K leads to a surface rearrangement that produces two different surface carbon species both of which react with oxygen to form CO. The kinetics of the oxidation of one species can be described in terms of partial control by the surface oxidation process and partial control by desorption of product. Competing carbon dissolution and nickel oxide forming processes preclude quantitative evaluation of the oxidation kinetics of the other carbon species.
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