The Coadsorption of Nitric Oxide, Nitrogen, and Oxygen on Rhenium

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Abstract
The coadsorption of nitric oxide, nitrogen, and oxygen on a polycrystalline rhenium filament was studied using flash desorption mass-spectroscopy. Substitutional desorption was not observed during the adsorption of nitric oxide, nitrogen, or oxygen on preadsorbed leayers. No oxygen or nitrogen adsorbs on rhenium saturated with nitric oxide. However, nitric oxide adsorbs on rhenium saturated with nitrogen or oxygen. The strength of the chemisorption bond between rhenium and adsorbed species becomes weaker in the order of: nitric oxide, oxygen, and nitrogen. When the same amount of nitric oxide molecules exist in various coadsorbed layers, the Tp of the nitrogen desorption spectrum from these layers is shifted to a lower temperature with an increase in the number of oxygen atoms in them, because the strength of the chemisorption bond of Re–N is weakened by the strongly-bonded Re–O. No desorption of the nitric oxide molecule from a coadsorbed layer of the “N2+O2” on rhenium was observed.

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