Silica-supported iron nitride in Fischer-Tropsch reactions

Journal Article · Fri Feb 01 04:00:00 EST 1985 · J. Catal.; (United States)

OSTI ID:5453061

Yeh, E; Jaggi, N K; Butt, J B; Schwartz, L H

The techniques of Moessbauer effect spectroscopy and wide angle x-ray diffraction have been applied to characterize nitrided iron catalysts (initial composition approx. = Fe/sub 2/N) supported on silica gel and used in the synthesis reaction. Moessbauer spectroscopy shows that the nitride catalyst becomes iron-rich during the first 3 h of reaction in the syngas environment (CO:H/sub 2/ = 1:3, T = 250/sup 0/C, 7.8 atm) indicating that nitrogen atoms are removed more rapidly by H/sub 2/ than they are simultaneously replaced by carbon atoms. After 3 h carburization becomes dominant, the carbon concentration increases, and the catalyst composition stabilizes after about 18 h of reaction. The analysis of the 4.2 K Moessbauer spectrum and x-ray diffraction of an equilibrated catalysts after 49 h of reaction gives a composition of Fe/sub 2.18/C/sub 1-y/N/sub y/, where y was estimated to be between 0.13 and 0.20. 30 refs., 4 figs., 3 tabs.

• Research Organization: Northwestern Univ., Evanston, IL
• DOE Contract Number: AC02-78ER04993
• OSTI ID: 5453061
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 91:2; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
ADSORBENTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
ELEMENTS
EXPERIMENTAL DATA
FISCHER-TROPSCH SYNTHESIS
GAMMA SPECTROMETERS
HCP LATTICES
HEXAGONAL LATTICES
INFORMATION
IRON COMPOUNDS
IRON NITRIDES
MANAGEMENT
MEASURING INSTRUMENTS
MOESSBAUER SPECTROMETERS
NITRIDES
NITROGEN
NITROGEN COMPOUNDS
NONMETALS
NUMERICAL DATA
ORTHORHOMBIC LATTICES
PNICTIDES
PROCESSING
SCATTERING
SILICA GEL
SPECTROMETERS
SYNGAS PROCESS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
X-RAY DIFFRACTION