Abstract
Hydrogenation of carbon monoxide on the Ru(001) surface has been investigated using high-resolution electron energy loss spectroscopy. Exposing gas-phase atomic hydrogen to a saturated carbon monoxide overlayer on Ru(001) at 100 K results in reaction (via Eley-Rideal kinetics) under ultrahigh vacuum conditions. The mechanism of this reaction is believed to be a good representation of the actual Langmuir-Hinshelwood hydrogen migration reaction that would occur under industrial conditions. Both η 1- and η 2-formyl are clearly identified as initial reaction intermediates. Heating the surface to 180 K decomposes some of the η 1-formyl, leading to adsorbed CO and hydrogen desorption, with the remainder of the η 1-formyl converting to η 2-formyl. Further annealing to 250 K leads to complete decomposition of the η 2-formyl, resulting in hydrogen desorption and regeneration of the original CO overlayer. This work represents the first isolation and spectroscopic identification of any reaction intermediate for carbon monoxide hydrogenation on any well-characterized surface at low pressure and temperature.
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