Abstract
Ultraviolet photoemission spectroscopy was used to study the reactivity of UNiAl with O2, CO2 and CO at 77,296 and 423 K. For O2 adsorption at 77 K, the dissociation of O2 is observed at low dosages followed by oxygen chemisorption at the surface. After this the formation of uranium and aluminum oxides is detected. At 77 K, UO2+x is formed, whereas at 296 and 423 K only substoichiometric oxides of uranium, UO2−x, are seen. Dissociation of CO2 at 77 K is observed, for low dosages, resulting in a saturation of the surface; afterwards physisorption of CO2 takes place. At 296 and 423 K, only CO2 dissociation was observed. We tentatively suggest that at these conditions uranium oxycarbide is formed. At 77 K, low dosage CO adsorption results in chemisorption of CO and after saturation of the surface CO is physisorbed. At 296 and 423 K, only CO dissociation is observed. Again the formation of uranium oxycarbide is suggested.
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