Activated hydrogen chemisorption on Ru-Cu/SiO/sub 2/ bimetallic substrates
Journal Article
·
· J. Phys. Chem.; (United States)
Hydrogen adsorption-desorption on Ru-Cu bimetallic particles supported on SiO/sub 2/ and on Cu films deposited on Ru(0001) was studied by temperature-programmed desorption (TPD) in ultrahigh vacuum. When H/sub 2/ was adsorbed on Ru-Cu/SiO/sub 2/ at elevated temperatures, subsequent TPD showed extensive high-temperature desorption of H/sub 2/. This effect was absent for Ru/SiO/sub 2/ and for Cu/SiO/sub 2/. Two H/sub 2/ peaks appeared in TPD when Ru-Cu/SiO/sub 2/ was dosed with H/sub 2/ at 423 K and cooled in H/sub 2/ to 300 K. The low-temperature peak was exchanged readily with D upon exposure to D/sub 2/ at 300 K. This peak was also vulnerable to displacement by exposure to CO at 300 K. The high-temperature peak did not exchange with D/sub 2/ and was not displaced by CO exposure. On Cu films vapor-deposited on Ru(0001), no activated chemisorption during low-pressure dosing was detectable for submonolayer and multilayer coverages of Cu. The results for hydrogen on Ru-Cu/SiO/sub 2/ are interpreted in terms of a model involving the activated migration of H(a) into the Cu-covered Ru particles, particularly along the interfaces between the two metals. TPD of CO from Ru-Cu/SiO/sub 2/, Ru/SiO/sub 2/, and Cu/SiO/sub 2/ showed no activated adsorption.
- Research Organization:
- Univ. of Texas, Austin (USA)
- OSTI ID:
- 6084154
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 92:14; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
DATA
DESORPTION
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
COPPER
DATA
DESORPTION
ELEMENTS
EXPERIMENTAL DATA
HYDROGEN
INFORMATION
METALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PLATINUM METALS
RUTHENIUM
SEPARATION PROCESSES
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SORPTIVE PROPERTIES
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
TRANSITION ELEMENTS