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The interaction of oxygen and carbon monoxide with a carbided Ni(111) surface

By John W. Geus, T.J. Vink, M.M.J. van Zandvoort and O.L.J. Gijzeman


The thermal decomposition of ethylene on Ni(111) at 250°C is shown to lead to carbon deposition on and - in a later stage - below the surface. Independent of the amount of carbon below the surface, CO is adsorbed with an isosteric heat of adsorption of 105 kJ/mol. The surface carbon reacts with oxygen at 250°C. The reaction rate is independent of the surface carbon coverage and first order in oxygen pressure. The subsurface carbon segregates to the surface after removal of the surface carbon layer

Topics: Scheikunde
Year: 1984
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