Abstract
The adsorption of formaldehyde on the clean Ru(001) surface and a Ru(001) surface on which an ordered p(2x2) overlayer of oxygen adatoms is present has been investigated via high resolution electron energy loss vibrational spectroscopy and thermal desorption mass spectrometry. On the clean Ru(001) surface, the formaldehyde surface bonding interaction at 80 K is primarily via ..pi..Co donation and ..pi../sub CO/* backdonation, leading to decomposition to adsorbed hydrogen and CO for low exposures. With subsequent exposure to formaldehyde, a small fractional surface coverage (theta = 0.02-0.03) of eta/sup 2/-formyl is observed, followed by formation of eta/sup 2/-formaldehyde (theta = 0.10) and eta/sup 1/-formaldehyde at saturation (monolayer) coverage. Upon heating, the eta/sup 2/-formyl decomposes to adsorbed hydrogen and CO by 120 K, and the eta/sup 1/-formaldehyde desorbs molecularly between 130 and 180 K. Further heating decomposes the remaining eta/sup 2/-formaldehyde, and thermal desorption measurements indicate that a total of a quarter monolayer of formaldehyde decomposes on the Ru(001) surface under these conditions.
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