Adsorption and reaction of methanethiol on Ru(0001)

Journal Article · Thu Nov 18 04:00:00 EST 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100148a028· OSTI ID:5651952

Mullins, D R; Lyman, P F ^[1]

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1. Oak Ridge National Lab., TN (United States)

Methanethiol (CH[sub 3]SH) adsorbs dissociatively on Ru(0001) at 100 K forming two molecular intermediates. These species have been identified by S 2p soft X-ray photoelectron spectroscopy (SXPS) as methylthiolate moieties adsorbed in different bonding sites. At low coverages only a high coordination adsorption site is occupied. The high coordination site is saturated at about 0.20 monolayer of CH[sub 3]SH, and then a low coordination site is populated. Upon heating, the thiolates totally decompose into atomic C, S, and gaseous H[sub 2] with a competing pathway producing atomic S and gaseous CH[sub 4] at high coverage. The methylthiolate in the low coordination site decomposes more readily than the methylthiolate in the high coordination site. Some surface hydrocarbon fragments are formed following C-S bond scission which totally decompose at higher temperatures. Isotopic labeling indicates that the desorption of the sulfhydryl hydrogen precedes the decomposition of the thiolate at high coverage and that there is exchange of hydrogen between the surface and the methyl group. 32 refs., 5 figs.

• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5651952
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:46; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
ADSORPTION
AUGER ELECTRON SPECTROSCOPY
CATALYSIS
CHEMICAL REACTIONS
DECOMPOSITION
ELECTRON SPECTROSCOPY
ELEMENTS
METALS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PLATINUM METALS
RUTHENIUM
SORPTION
SPECTROSCOPY
THIOLS
TRANSITION ELEMENTS
TUNGSTEN
X-RAY SPECTROSCOPY