Abstract
The coadsorption of O, Au and CO and CO a + O a reaction is studied on Ru(0 0 0 1) using temperature programmed desorption, Auger electron spectroscopy, and low energy electron diffraction. CO/CO 2 desorption is measured on surfaces with different oxygen coverages and varying concentrations of Au using isotopically labeled 13C 18O. There is no CO 2 formation from CO adsorbed on clean Ru(0 0 0 1) and O(2 × 1), but CO 2 forms on CO covered RuO x surfaces. We have observed CO 2 formation below room temperature on O(2 × 1) and RuO x surfaces covered by Au nanoparticles. The conversion from CO to CO 2 is found to be the highest over submonolayer Au films supported on RuO x suggesting a synergistic effect between catalytic Au nanoparticles and RuO 2 domains.
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