VHF EPR determination of the chemical forms of organic sulfur in coal

Technical Report · Tue Jan 01 04:00:00 EST 1991

OSTI ID:5435744

Clarkson, R B; Belford, R L

Very High Frequency Electron Paramagnetic Resonance (VHF EPR) spectroscopy has demonstrated the ability to observe organic sulfur in coal. We have constructed a unique VHF EPR instrument operating at the W-band (96 GHz), one of only four such instruments in the world, and the only one studying coal. We are employing this instrument, as well as collaborating with scientists at Cornell University, who have a 250 GHz spectrometer, to develop a clearer understanding of the relationships between the VHF EPR spectra we observe from Illinois coal and the organic sulfur species present in it. Work this Quarter has focused on three of the main areas described in the work plan: (1) Synthesis and analysis of model systems for thiophenic sulfur species in coal; (2) VHF EPR of inertinites from an Illinois {number sign}6 coal, particularly the effects of NO on this signal; (3) VHF EPR of coal subjected to perchloroethylene extraction and low-temperature pyrolysis, and preliminary interpretation of the spectra from these samples and implications for desulfurization effectiveness. 7 figs.

• Research Organization: Illinois Univ., Urbana, IL (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-90PC90176
• OSTI ID: 5435744
• Report Number(s): DOE/PC/90176-T34; ON: DE91018298
• Country of Publication: United States
• Language: English

Related Subjects

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400102 -- Chemical & Spectral Procedures
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BITUMINOUS COAL
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
DECOMPOSITION
DESULFURIZATION
DOCUMENT TYPES
ENERGY SOURCES
EXTRACTION
FOSSIL FUELS
FREQUENCY RANGE
FUELS
HETEROCYCLIC COMPOUNDS
MACERALS
MAGNETIC RESONANCE
MAGNETISM
MATERIALS
MHZ RANGE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PARAMAGNETISM
PROGRESS REPORT
PYROLYSIS
RESONANCE
SEPARATION PROCESSES
STRUCTURAL CHEMICAL ANALYSIS
THERMOCHEMICAL PROCESSES
THIOPHENE