Microcrystalline iron sulfide particles in coal: A Moessbauer study: Final report, March 1, 1986-February 28, 1987

Technical Report · Fri May 01 04:00:00 EDT 1987

OSTI ID:6470348

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

This report presents progress achieved in the first eight months of a continuing project. In this time, new equipment has been installed and tested, and preliminary experiments on all sample types to be investigated have been completed. Collection of data for iron sulfide standards and for one microcrystalline iron oxide sample is nearly complete. Analyses of the data are in progress. The objective of this research project is to employ Moessbauer spectroscopy to examine microcrystalline iron sulfides in coal chars to determine the extent to which highly dispersed iron sulfide catalysts may be present in the chars. The Moessbauer spectrometer used in this project is a Ranger Scientific MS-900. All the data have been collected in a symmetric mode at velocities of 9.8 mm/s and 11.3 mm/s. Low temperatures (4.3K) are obtained with a liquid He dewar made by Lakeshore Cryotronic. A typical low-temperature experiment lasts about 7 days. The Moessbauer spectra are analyzed using the program MOSFIT, which employs an iterative least-squares fitting method to find the best fit of Lorentzian functions to the experimental spectrum. Fourier smoothing techniques are employed. Analysis of the spectra of two char samples indicates that the concentration of iron sulfides is small. Superparamagnetism in the char spectra is evident; however, particle size estimates will be obtained. One of the standard samples of iron oxide was studied at different temperatures. The blocking temperature for the preparation of this sample is between 9.6 and 24K. Particle size estimates are between 94 and 128 A. 10 refs., 7 figs.

• Research Organization: Southern Illinois Univ., Carbondale (USA). Coal Extraction and Utilization Research Center
• DOE Contract Number: FC22-86PC91272
• OSTI ID: 6470348
• Report Number(s): DOE/PC/91272-T9; ON: DE87009875
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300 -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALCOHOLS
BETA DECAY RADIOISOTOPES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONACEOUS MATERIALS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COBALT 57
COBALT ISOTOPES
DAYS LIVING RADIOISOTOPES
DESULFURIZATION
ELECTRON CAPTURE RADIOISOTOPES
ENERGY SOURCES
ETHANOL
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
INTERMEDIATE MASS NUCLEI
IRON COMPOUNDS
IRON OXIDES
IRON SULFIDES
ISOTOPES
MATERIALS
MINERALS
MOESSBAUER EFFECT
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PYRRHOTITE
RADIOISOTOPES
SIZE
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TROILITE