Adsorption and Reaction of Hydrogen Sulfide on Thin-film Cerium Oxide
- ORNL
The adsorption and reaction of hydrogen sulfide, H{sub 2}S, have been studied on cerium oxide thin films that were vapor deposited on Ru(0 0 0 1). The behavior of the H{sub 2}S was examined as a function of Ce oxidation state. H{sub 2}S weakly chemisorbs on fully oxidized CeO{sub 2} desorbing near 155 K. Hydrogen from the H{sub 2}S reacts with the surface O to desorb as water between 200 K and 450 K. When ca. 20% of the Ce{sup 4+} is reduced to Ce{sup 3+} more H{sub 2}S 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{sub 2} desorbs near 580 K. S 2p photoelectron spectroscopy indicates the decomposition of H{sub 2}S into -SH and then -S as the sample is annealed from 100 K to 600 K. O 1s photoemission indicated the presence of H{sub 2}O and -OH.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- DE-AC05-00OR22725
- OSTI ID:
- 930990
- Journal Information:
- Surface Science, Vol. 601, Issue 21; ISSN 0039-6028
- Country of Publication:
- United States
- Language:
- English
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