Summary: NOTES
Mechanism for the high reactivity of CO oxidation on a ruthenium­oxide
Zhi-Pan Liu and P. Hua)
School of Chemistry, The Queen's University of Belfast, Belfast, BT9 5AG, United Kingdom
Ali Alavi
Department of Chemistry, University of Cambridge, Cambridge, CB2 1EW, United Kingdom
Received 11 January 2001; accepted 17 January 2001
DOI: 10.1063/1.1353584
Ruthenium is notably one of the poorest catalysts for CO
oxidation under conditions of low and medium oxygen cov-
erages, but turns out to be superior to Pt and Pd if operated in
excess O2. This puzzling anomaly, introduced by the so-
called ``pressure gap,'' has been the subject of many
studies,1­8
both theoretically and experimentally. Three
stages have been found for CO oxidation on Ru 0001 as the
total O concentration increases.5­8
1 Under UHV condi-
tions, dissociative adsorption of O2 under low-pressure leads
to apparent saturation at a coverage 0.5 monolayer

Source: Alavi, Ali - Department of Chemistry, University of Cambridge

Collections: Chemistry