Abstract
Abstract The coadsorption of CO and methylamine on Ru(001) has been investigated by LEED, TPD and HREELS to clarify coadsorbate-induced reaction phenomena in ordered coadsorbed layers. CO and methylamine formed mixed adsorption layers accompanied with the change of adsorption site for CO by the interaction with methylamine. The dissociation process of methylamine changed as a function of partial CO coverage. For methylamine alone on Ru(001), the CH, NH, and CN bonds dissociate simultaneously at 280–320 K. In the presence of low-coverage CO molecules ( θ ≈ 0.3), NH 2 species was formed and persisted on the surface up to 380 K, whereas the coadsorbed CO molecules behaved as a spectator for the dissociation of the CH bonds. In the presence of high-coverage (0.5–0.68) CO, a well ordered (2 × 2) phase was formed and the new partial dehydrogenation of methylamine takes place to produce a species containing a CN double bond as a stable intermediate, followed by complete dissociation at higher temperatures. The control of reaction path by coadsorbates is discussed.
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