Abstract
We have combined high resolution electron energy loss spectroscopy (HREELS) with a high-pressure/low-pressure (HPLP) system to study the behavior of the monolayer structure of stable hydrocarbon species that form on single-crystal metal surfaces during catalytic reactions at atmospheric pressure. We find that a monolayer of adsorbed ethylidyne (CCH 3) on Rh(111) at 310 K does not hydrogenate to ethylene or ethane in one atmosphere of static D 2. The methyl group hydrogens exchange with deuterium is a slow process. The amount of exchange depends strongly on the amount of uncovered, bare-metal surface, but little on the hydrogen pressure. A mechanism for H, D exchange involving ethylidene (CHCH 3) as an intermediate is proposed.
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