Atomic-Scale Structure and Catalytic Reactivity of the RuO2(110) Surface

Details Atomic-Scale Structure and Catalytic Reactivity of the RuO2(110) Surface Atomic-Scale Structure and Catalytic Reactivity of the RuO2(110) Surface

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000sci...287.1474o&link_type=abstract

Science, Volume 287, Issue 5457, pp. 1474-1476 (2000).

Physics

140

Scientific paper

The structure of RuO2(110) and the mechanism for catalytic carbon monoxide oxidation on this surface were studied by low-energy electron diffraction, scanning tunneling microscopy, and density-functional calculations. The RuO2(110) surface exposes bridging oxygen atoms and ruthenium atoms not capped by oxygen. The latter act as coordinatively unsaturated sites-a hypothesis introduced long ago to account for the catalytic activity of oxide surfaces-onto which carbon monoxide can chemisorb and from where it can react with neighboring lattice-oxygen to carbon dioxide. Under steady-state conditions, the consumed lattice-oxygen is continuously restored by oxygen uptake from the gas phase. The results provide atomic-scale verification of a general mechanism originally proposed by Mars and van Krevelen in 1954 and are likely to be of general relevance for the mechanism of catalytic reactions at oxide surfaces.

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