Adsorption and thermal evolution of SO{sub 2} on Ru(0001)

Journal Article · Sun Oct 21 04:00:00 EDT 2007 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.2789421· OSTI ID:21024340

Hennies, F; Foehlisch, A; Wurth, W; Feulner, P; Fink, A; Menzel, D ^[1]

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1. Institut fuer Experimentalphysik, Universitaet Hamburg, Luruper Chaussee 149, 22761 Hamburg (Germany)

Using high resolution S 2p and O 1s x-ray photoelectron spectroscopies, the adsorption of SO{sub 2} and its surface bound reaction products on Ru(0001) have been investigated simultaneously while dosing SO{sub 2} and while heating the adsorbed species. SO{sub 2} is found to adsorb on Ru(0001) at 100 K molecularly in two variants as well as dissociatively and to react to SO{sub 3}, SO{sub 4}, SO, and S with increasing coverage. After the monolayer has been saturated, SO{sub 2} adsorbs molecularly in multilayers. When heating adsorbed SO{sub 2} from 100 K, SO, SO{sub 2}, and SO{sub 4} decompose in a wide temperature range up to 305 K. In contrast SO{sub 3} is found to be stable bound to Ru(0001) up to 300 K and to disappear from the surface to below 325 K. At 550 K the surface remains with a saturated atomic sulfur and oxygen layer and some sulfur species in a second layer. Our quantitative analysis of the sulfur amount bound to the surface supports a simple desorption process only for SO{sub 4}. All other species mainly or partly decompose on the surface.

• OSTI ID: 21024340
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 127; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ADSORPTION
DESORPTION
HEATING
LAYERS
RUTHENIUM
SULFATES
SULFITES
SULFUR DIOXIDE
SURFACES
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
X-RAY PHOTOELECTRON SPECTROSCOPY