The form-of-occurrence of chlorine in US coals: An XAFS (x-ray absorption fine structure) investigation

Conference · Sun Jan 01 04:00:00 EST 1989 · Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA)

OSTI ID:5113270

Huggins, F E; Huffman, G P ^[1]; Lytle, F W; Greegor, R B ^[2]

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1. Univ. of Kentucky, Lexington (USA)
2. Boeing Co., Seattle, WA (USA)

X-ray absorption fine structure (XAFS) spectroscopy determinations have been made at the chlorine K absorption edge on a number of US coals in order to investigate the form-of-occurrence of chlorine in the coals. The coals vary in chlorine content from 0.04 to 0.84 wt% and in rank from lignite to hvA bituminous. For the most part, the chlorine K-edge XAFS spectra of the coals are very similar and no significant variation is noted among spectra of leached samples of the same coal. The coal XANES spectra differ significantly from spectra of all organo-chlorine compounds and inorganic chlorides examined. However, spectra of hydrated chloride species, including NaCl solutions and CaCl{sub 2}.6H{sub 2}O, and of organic hydrochlorides, are quite similar to the coal spectra. Analysis of the EXAFS region for the coals suggests the presence of a relatively long bond ({approximately}3.0 - 3.1{angstrom}) to water molecules in the nearest neighbor shell around the chlorine. These data and results are compatible with hydrated chloride anions in the moisture associated with coals as the major form-of-occurrence of chlorine in US coals.

• OSTI ID: 5113270
• Report Number(s): CONF-8904162--
• Conference Information: Journal Name: Preprints of Papers, American Chemical Society, Division of Fuel Chemistry; (USA) Journal Volume: 34:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ABSORPTION SPECTROSCOPY
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHLORINE COMPOUNDS
COAL
COAL RANK
DATA
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
EXPERIMENTAL DATA
FINE STRUCTURE
FOSSIL FUELS
FUELS
HALOGEN COMPOUNDS
INFORMATION
IONIZING RADIATIONS
MATERIALS
NUMERICAL DATA
QUALITATIVE CHEMICAL ANALYSIS
RADIATIONS
SPECTROSCOPY
X RADIATION