Kinetic and Moessbauer study of the CO/H/sub 2/ reaction over Fe/TiO/sub 2/ reduced at various temperatures

Journal Article · Mon Oct 01 04:00:00 EDT 1984 · J. Catal.; (United States)

OSTI ID:6458676

Tau, L M; Bennett, C O

The CO/H/sub 2/ reaction over Fe/TiO/sub 2/ has been studied by Moessbauer spectroscopy and kinetic measurements after the catalyst was reduced at 558, 723, and 773 K. The particle size estimated from the uptake of H/sub 2/ by the desorption method is comparable to that from X-ray line broadening. Moessbauer spectroscopy indicates that carbide formation is suppressed during the CO/H/sub 2/ reaction for the catalyst reduced at 723 and 773 K. The reaction activity for the catalyst reduced at 558 K is an order of magnitude higher than that of the 773 K-reduced catalyst. The nature of the surface species formed during the CO/H/sub 2/ reaction is quite different from those found for the Fe/SiO/sub 2/ and Fe/Al/sub 2/O/sub 3/ systems. The changes in the activation energy and selectivity for the catalysts reduced at various temperatures are appreciable. The experimental results are discussed in terms of a localized charge transfer from the metal to the support during the course of high-temperature reduction. The requirement for this localized charge transfer is the presence of TiO/sub x/ species on top of the metal surface. 72 references, 12 figures, 6 tables.

• Research Organization: Univ. of Connecticut, Storrs
• OSTI ID: 6458676
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 89:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090121 -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISORPTION
COHERENT SCATTERING
COMPARATIVE EVALUATIONS
DATA
DESORPTION
DIFFRACTION
ELEMENTS
ENERGY
EXPERIMENTAL DATA
FLUIDS
GAMMA SPECTROMETERS
GASES
HIGH TEMPERATURE
HYDROGEN
INFORMATION
IRON
KINETICS
MEASURING INSTRUMENTS
METALS
METHANATION
MOESSBAUER SPECTROMETERS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
REACTION KINETICS
REDUCTION
SCATTERING
SEPARATION PROCESSES
SIZE
SORPTION
SPECTROMETERS
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
SYNTHESIS GAS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION