Solid electrolyte aided study of the oxidation of hydrogen on copper and copper oxide catalysts
- Tufts Univ., Medford, MA (United States)
The catalytic oxidation of hydrogen on copper and copper oxide surfaces was studied in a solid electrolyte cell at 250-365[degrees]C and 1 atm. The technique of solid electrolyte potentiometry (SEP) was used to monitor the thermodynamic activity of oxygen adsorbed on the catalyst surface during reaction. The oxygen activity value resulted from a steady-state mass balance of oxygen on the catalyst surface and under specific conditions, was several orders of magnitude lower than the gas-phase oxygen partial pressure. The stable phase of the solid was usually CuO and less frequently Cu[sub 2]O or metallic Cu. The reaction on reduced (Cu metal) surface exhibited much higher rates than on either oxide, while between the latter two, CuO was the least active surface. The rate-determining step on CuO was the surface reaction between atomically adsorbed hydrogen and oxygen. A kinetic model that quantitatively explains both kinetic and potentiometric measurements in the CuO regime is presented. 43 refs., 10 figs.
- OSTI ID:
- 7205375
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 145:2; ISSN 0021-9517; ISSN JCTLA5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COPPER
COPPER COMPOUNDS
COPPER OXIDES
ELEMENTS
HETEROGENEOUS CATALYSIS
HYDROGEN
KINETICS
METALS
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS