The effect of structurally ordered sulfur overlayers on the surface reactivity of platinum
The effects of sulfur on the surface reactivity of platinum for methanol was studied using methods of surface science. The interaction of CH/sub 3/OD with Pt(111), Pt(111)(2x2)S' and Pt(111) ( 3x 3)R30/sup 0/S surfaces was investigated using LEED and AES for surface characterization and TPRS for kinetic analysis. Substantial differences were observed between the clean and sulfided surface. On clean Pt(111) methanol at low coverages showed both complete dissociation to atomic fragments and partial dissociation to adsorbed carbon monoxide and hydrogen. At coverages approaching a monolayer the CH/sub 3/O( /SUB a/ ) intermediate was stabilzed due to the inavailability of sites for further decomposition. Carbon dioxide was also formed by reaction of both CH/sub 3/O( /SUB a/ ) and CO( /SUB a/ ) with oxygen adatoms. On both sulfided surfaces methane was formed in addition to CO and H/sub 2/. Since CH/sub 4/ was formed with approximately the same kinetics as from H/sub 2/CO, it is suggested that it arose from the CH/sub 3/O( /SUB a/ ) intermediate. Sulfur further modified the reactions of methanol by reducing the total amount adsorbed and dissociated.
- Research Organization:
- Stanford Univ., Stanford, CA
- OSTI ID:
- 6338936
- Report Number(s):
- CONF-820304-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 27:2; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ADSORPTION
ALCOHOLS
ALKANES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
CRYSTAL STRUCTURE
DISSOCIATION
ELEMENTS
HYDROCARBONS
HYDROGEN
HYDROXY COMPOUNDS
INTERACTIONS
KINETICS
METALLURGY
METALS
METHANE
METHANOL
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL METALLURGY
PLATINUM
PLATINUM METALS
REACTION KINETICS
SEPARATION PROCESSES
SORPTION
STRUCTURAL CHEMICAL ANALYSIS
SULFUR COMPOUNDS
SURFACE PROPERTIES
TRANSITION ELEMENTS