Chemical properties of Zn/S/Mo(110) and Co/S/Mo(110) surfaces: Reaction with hydrogen and formation of hydrogen sulfide
- Brookhaven National Lab., Upton, NY (United States)
- National Univ. of Singapore (Singapore)
The chemical and electronic properties of a series of Zn/S/Mo(110) and Co/S/Mo(l10) systems have been investigated using photoemission, thermal desorption mass spectroscopy, and hydrogen (H{sub 2}, D{sub 2}, or D) chemisorption. Sulfur multilayers supported on Mo(110) are very reactive toward admetals like Zn and Co. The behavior of the Zn/S/Mo(110) and Co/S/Mo(110) systems indicates that Zn and Co promote Mo S interactions, inducing the formation of molybdenum sulfide films. The ZnMoS and CoMoS films were unreactive toward H{sub 2} or D{sub 2} under ultrahigh vacuum conditions. As gas-phase hydrogen atoms (D) impinged on the surfaces, gaseous hydrogen sulfide was formed. Thus, the slow step in the D{sub 2,gas} + S{sub solid} {yields} D{sub 2}S{sub gas} reaction is the dissociation of molecular hydrogen. A good correlation exists between trends seen in the hydrodesulfurization (HDS) activity of ZnMoS and CoMoS catalysts and trends found for the sulfidation of Mo and hydrogenation of S in ZnMoS and CoMoS films. The systems that contain Co show the larger HDS activity, the stronger metal metal interactions with a subsequent increase in the reactivity of Mo toward S-containing molecules, and the bigger tendency to create unsaturated Mo sites through the hydrogenation of Mo-bonded S atoms. 55 refs., 12 figs.
- Research Organization:
- Brookhaven National Laboratory (BNL), Upton, NY
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 380779
- Journal Information:
- Journal of Physical Chemistry, Journal Name: Journal of Physical Chemistry Journal Issue: 34 Vol. 100; ISSN JPCHAX; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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