Carbon monoxide oxidation over three different oxidation states of copper: Metallic copper, copper (I) oxide, and copper (II) oxide - a surface science and kinetic study
- Lawrence Berkeley Lab., CA (United States)
Reaction rates and activation energies were measured for carbon monoxide oxidation over thin films of metallic copper, copper (I) oxide, and copper (II) oxide grown on graphite. The reactions were carried out in the temperature range 200-350[degrees]C at total pressures of 100 Torr. Auger Electron Spectroscopy (AES) and X-ray Photoelectron Spectroscopy (XPS) were used to characterize the growth and oxidation states of the copper films before and after catalytic reactions. The stability of a given oxidation state of copper under reaction conditions were found to be a function of the oxidizing power of the CO/O[sub 2] partial pressure ratio: Metallic copper, Cu[sub 2]O, and CuO were stable at 97/3, 90/10, and 66/33 ratios, respectively. The rate of reaction at 300[degrees]C decreased with increasing copper oxidation state (Cu > Cu[sub 2]O > CuO) and the activation energy increased with increasing copper oxidation state (Cu 9 < Cu[sub 2]O 14 < CuO 17 kcal/mol). The kinetic parameters for CO oxidation over platinum foil was tested at a 66/33 CO/O[sub 2] ratio for comparison. The reaction rate over platinum was approximately equal to that over metallic copper at 300[degrees]C and had a larger activation energy (20 kcal/mol) than CuO. The possible mechanisms for CO oxidation over the different oxidation states of copper are discussed. 30 refs., 8 figs., 1 tab.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7084551
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Journal Issue: 2 Vol. 147:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dynamic study of the oxidation state of copper in the course of carbon monoxide oxidation over powdered CuO and Cu{sub 2}O
Solid electrolyte aided study of the oxidation of hydrogen on copper and copper oxide catalysts
Related Subjects
010800 -- Coal
Lignite
& Peat-- Waste Management
33 ADVANCED PROPULSION SYSTEMS
330702 -- Emission Control-- Carbon Monoxide
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER
COPPER COMPOUNDS
COPPER OXIDES
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY
HETEROGENEOUS CATALYSIS
KINETICS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
REACTION KINETICS
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY SPECTROSCOPY