Chemisorption and decomposition of H/sub 2/S on Rh(100)
The chemisorption and decomposition of H/sub 2/S adsorbed on Rh(100) at 100 K have been studied by thermal desorption Auger electron spectroscopy. Hydrogen sulfide exposure to clean Rh(100) leads to both molecular desorption and dissociative processes upon heating. On sulfur-covered rhodium, there is less decomposition of H/sub 2/S. The adsorption of H/sub 2/S at 300 K is completely dissociative and hydrogen desorbs during exposure. Preadsorbed D(a) does not alter the desorption energetics of H/sub 2/S. Coadsorption of D and H/sub 2/S leads to no detectable deuterium incorporation in desorbing hydrogen sulfide but the isotopic forms of molecular hydrogen all desorb in relatively large amounts. Preadsorbed D(a) inhibits the decomposition of H/sub 2/S. Postdosing H/sub 2/S does not displace D(a) from the surface at 100 K but does shift the deuterium desorption to significantly lower temperatures. 28 references, 9 figures.
- Research Organization:
- Univ. of Texas, Austin
- OSTI ID:
- 5890773
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:2; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
AUGER ELECTRON SPECTROSCOPY
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CRYSTALS
DATA
DECOMPOSITION
DESORPTION
DEUTERIUM COMPOUNDS
ELECTRON SPECTROSCOPY
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INFORMATION
ISOTOPIC EXCHANGE
LOW TEMPERATURE
MEDIUM TEMPERATURE
METALS
MILLER INDICES
MONOCRYSTALS
NUMERICAL DATA
PLATINUM METALS
RHODIUM
SEPARATION PROCESSES
SORPTION
SORPTIVE PROPERTIES
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENTS