INTERACTION AND REACTION OF CARBON MONOXIDE AND OXYGEN ON Ru(100) AND Ru(100)-Pd

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Abstract
The behavior of coadsorbed CO and oxygen on Ru(100) is quite different from that observed on the other principal faces of the metal. LEED data show that the two adsorbates coexist in separate domains and that mutual compression effects result in formation of high-density oxygen structures which are not accessible by oxygen chemisorption alone. These domains are catalytically inert under UHV conditions, although TDS and ΔΦ results show that they significantly influence each other. The presence of Pd triggers CO 2 formation at a threshold metal coverage of 2 ML, full Pd activity being recovered at ~6 ML.

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