Isotopic exchange measurements of the rates of adsorption/desorption and interconversion of CO and CO/sub 2/ over chromia-promoted magnetite: implications for water-gas shift

Journal Article · Thu Jan 01 04:00:00 EST 1987 · J. Catal.; (United States)

OSTI ID:5665532

Tinkle, M; Dumesic, J A

Isotopic exchange measurements were used to investigate the adsorption/desorption and interconversion of CO and CO/sub 2/ on chromia-promoted magnetite at 565 and 627 K. The interconversion between CO and CO/sub 2/ was shown to take place through surface adsorbed species. Furthermore, the rate of interconversion was limited by the rates of adsorption/desorption, indicating either that adsorbed CO and CO/sub 2/ are in equilibrium on the surface or that the adsorption of CO and CO/sub 2/ leads to the same surface species, e.g., a surface carbonate species. A kinetic model for the water-gas shift over magnetite is proposed, and the results of the isotopic exchange measurements and volumetric adsorption data are used to estimate the rate and equilibrium constants for this model.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 5665532
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 103:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010408* -- Coal
Lignite
& Peat-- C1 Processes-- (1987-)
ADSORPTION
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHROMIUM COMPOUNDS
CHROMIUM OXIDES
DESORPTION
ELEMENTS
EQUATIONS
HYDROGEN
IRON COMPOUNDS
IRON ORES
IRON OXIDES
ISOTOPIC EXCHANGE
KINETIC EQUATIONS
KINETICS
MAGNETITE
MATHEMATICAL MODELS
MINERALS
NONMETALS
ORES
OXIDE MINERALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
SHIFT PROCESSES
SORPTION
SURFACE PROPERTIES
TRANSITION ELEMENT COMPOUNDS