Abstract
The adsorption and reaction of hydrogen sulfide, H 2S, have been studied on cerium oxide thin films that were vapor deposited on Ru(0 0 0 1). The behavior of the H 2S was examined as a function of Ce oxidation state. H 2S weakly chemisorbs on fully oxidized CeO 2 desorbing near 155 K. Hydrogen from the H 2S reacts with the surface O to desorb as water between 200 K and 450 K. When ca. 20% of the Ce 4+ is reduced to Ce 3+ more H 2S dissociates to –OH and –SH and water is produced near 580 K. When the ceria is ca. 70% reduced, water formation is suppressed and H 2 desorbs near 580 K. S 2p photoelectron spectroscopy indicates the decomposition of H 2S into –SH and then –S as the sample is annealed from 100 K to 600 K. O 1s photoemission indicated the presence of H 2O and –OH.
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