Solid electrolyte aided study of the oxidation of hydrogen on copper and copper oxide catalysts

Journal Article · Tue Feb 01 00:00:00 EST 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1063· OSTI ID:7205375

Balian, A; Hatzigiannis, G; Eng, D; Stoukides, M ^[1]

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1. 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), Vol. 145:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COPPER
CATALYTIC EFFECTS
COPPER OXIDES
HYDROGEN
OXIDATION
CATALYSTS
CHEMICAL REACTION KINETICS
HETEROGENEOUS CATALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
CATALYSIS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
ELEMENTS
KINETICS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties