Shock-induced modification of a coal-derived pyrite. [Effects on liquefaction conversions]
Objectives were to characterize the effects of high-pressure shock-wave loadings on a coal-derived pyrite and to determine the effect of the increased defect concentration of the pyrite on coal liquefaction. The materials used were Robena pyrite with about 30 wt. % of phases other than FeS/sub 2/ and a sample of cleaned Robena pyrite which only contained pyrite and marcasite. The defect concentration in these materials was altered by the use of high-pressure shock-wave loadings with peak pressures of 10 to 15 GPa and peak temperatures of 600 to 900/sup 0/K. Both shocked materials showed broadened high 2THETA lines in the pyrite x-ray pattern which were caused by strain-induced lattice defects. The shocked uncleaned pyrite showed the presence of two additional phases, Fe/sub 3/C and pyrrhotite. The shocked cleaned pyrite showed the possible formation of smythite (Fe/sub 9/S/sub 11/) and pyrrhotite. Catalytic activity tests of the shocked cleaned pyrite were carried out in tubing reactors with West Virginia Blacksville No. 2 coal and SRC-II heavy distillate at 425/sup 0/C. The toluene and THF conversions from the runs with the shocked cleaned pyrite were similar to those obtained from the unshocked cleaned pyrite. This suggests that pyrite may not be the active phase which yields improvements in coal liquefaction or that the defects in pyrite are lost under coal-liquefaction conditions.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA); Colorado School of Mines, Golden (USA). Dept. of Physics
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5767699
- Report Number(s):
- SAND-82-0658; ON: DE83017772
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010405* -- Coal
Lignite
& Peat-- Hydrogenation & Liquefaction
CARBONACEOUS MATERIALS
CATALYTIC EFFECTS
CHALCOGENIDES
COAL
COAL LIQUEFACTION
COHERENT SCATTERING
CRYSTAL-PHASE TRANSFORMATIONS
DEFECTS
DIFFRACTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON SULFIDES
LIQUEFACTION
MATERIALS
MINERALS
PHASE TRANSFORMATIONS
PYRITE
SCATTERING
SHOCK WAVES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION