Interaction of sulfur and bimetallic surfaces: Fe-promoted sulfidation of Mo(110)
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973 (United States)
Iron promotes the interaction between S{sub 2} and Mo(110). The exposure of Mo(110) to large amounts of S{sub 2} produces only a chemisorbed layer of sulfur, without forming molybdenum sulfides. The sulfidation of Mo occurs after exposing Fe/Mo(110) surfaces to S{sub 2} gas. Fe promotes the rate of formation of molybdenum sulfides by transferring charge to Mo (favoring in this way an electrophilic attack of S on Mo) and by changing the structure of the surface (making the penetration of S into the bulk of the sample easier). The thermal stabilities of the MoS{sub {ital x}}/Mo(110) and FeS{sub {ital y}}/MoS{sub {ital x}}/Mo(110) systems are comparable, with the bimetallic sulfide showing a somewhat lower decomposition temperature ({approximately}1200 K). The behavior of FeMoS catalysts in hydrodesulfurization processes is discussed in light of these results. {copyright} {ital 1996 American Vacuum Society}
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 284671
- Report Number(s):
- CONF-9510385--
- Journal Information:
- Journal of Vacuum Science and Technology, A, Journal Name: Journal of Vacuum Science and Technology, A Journal Issue: 3 Vol. 14; ISSN 0734-2101; ISSN JVTAD6
- Country of Publication:
- United States
- Language:
- English
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