Moessbauer spectroscopy of supported Fe-Co alloy catalysts for Fischer-Tropsch synthesis

Journal Article · Sun Nov 01 04:00:00 EST 1981 · J. Catal.; (United States)

OSTI ID:5702972

Stanfield, R M; Delgass, W N

The effects of pretreatment, reduction, reoxidation, and CO hydrogenation at 1 atm pressure on silica-supported Fe-Co catalysts are reported. Air drying the catalysts after incipient wetness preparation produced larger metallic crystallites than vacuum drying. Upon reduction the Fe and Co interact and form bimetallic clusters on SiO/sub 2/, as evidenced by the increased reducibility of the Fe and the variation of the magnetic hyperfine field of the Moessbauer spectra as a function Co loading. Disorder in the local Fe-Co environment within the particles is indicated in the Moessbauer effect by large linewidths and slight deviations from the expected values of the hyperfine field. Materials with up to 10 at % Co in Fe (10% by weight total metal loading) form carbides during reaction, but at a slower rate than Fe alone on SiO/sub 2/. At higher than 25 at % Co concentration in iron, little change occurs when the reduced state is exposed to a 3.2 H/sub 2/-to-C0 mole ratio syngas at 523/sup 0/K, atmospheric pressure, and differential conversion.

• Research Organization: Purdue Univ., West Lafayette, IN
• OSTI ID: 5702972
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 72:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090120* -- Hydrocarbon Fuels-- Preparation-- (1976-1989)
10 SYNTHETIC FUELS
ALLOYS
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COBALT ALLOYS
DATA
EXPERIMENTAL DATA
FISCHER-TROPSCH SYNTHESIS
INFORMATION
IRON ALLOYS
METHANATION
MINERALS
MOESSBAUER EFFECT
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SILICA
SILICON COMPOUNDS
SILICON OXIDES