Microcrystalline iron sulfide particles in coal: A Moessbauer study: Final report, March 1--December 31, 1987

Technical Report · Tue Mar 01 04:00:00 EST 1988

DOI:https://doi.org/10.2172/6447763· OSTI ID:6447763

Hinckley, C. C.; Smith, G. V.; Saporoschenko, M.

Organic sulfur can be removed from coal using a process which employs iron sulfides as in-situ catalysts. The active desulfurization catalyst is troilite, or a pyrrohtite/troilite mixture. In this project Moessbauer spectroscopy was used to study acid washed desulfurized chars. Moessbauer spectra of a specially prepared group of pyrrhotite standards were also analyzed. Parameter values obtained for these samples are reported and related to the iron sulfide composition. Moessbauer spectra of washed chars exhibit doublets which may be partly attributed to microcrystalline pyrite present in the coal before treatment. Spectra of these materials have been analyzed with the help of Fourier smoothing techniques and a standard iterative method to fit Lorentzian functions to Moessbauer spectra. A sample of microcrystalline iron oxide was used as a standard to test analysis procedures. Analyses of selected low temperature char spectra confirm the presence of super-paramagnetic particles, but also indicate that they are predominantly iron oxides. Particles exhibiting internal magnetic field values characteristic of pyrrhotites are present in the samples in low concentrations. Approximately half of the spectra observed in the chars is due to nonmagnetic iron compounds. 12 refs., 7 figs.

• Research Organization: Southern Illinois Univ., Carbondale (USA). Coal Extraction and Utilization Research Center
• Sponsoring Organization: USDOE
• DOE Contract Number: FC22-87PC79863
• OSTI ID: 6447763
• Report Number(s): DOE/PC/79863-T7; ON: DE89008398
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
CARBONACEOUS MATERIALS
CATALYTIC EFFECTS
CHALCOGENIDES
CHARS
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
COMPUTER CODES
DESULFURIZATION
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON OXIDES
IRON SULFIDES
M CODES
MAGNETIC FIELDS
MATERIALS
MINERALS
MOESSBAUER EFFECT
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PROGRESS REPORT
PYROLYSIS PRODUCTS
PYRRHOTITE
SIZE
SPECTRA
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TROILITE