Molecular X-ray scattering measured from two of the Argonne premium coals as a tool for studying polynuclear aromatic hydrocarbons in coals

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:7199234

Bissell, M

X-ray scattering techniques were used to gain a better understanding of the structural characteristics of the polynuclear aromatic hydrocarbons in coals. Carbon-carbon distances obtained from Radial Distribution Functions and Pair Correlation Functions agreed well with model distances. Two different calculations of n[sub cc], the average number of nearest neighbor carbons per carbon atom, gave comparable values. For the higher ranked coal an average value of 2.3 was calculated while for the lower carbon content coal, a value of 2.2 was obtained. These values were in the range expected for a substance composed of both aromatic and aliphatic linkages. Separation of the contributions from aromatic and aliphatic carbon-carbon distances to the first and second peaks in the Pair Correlation Functions showed the higher aromatic content of the higher ranked, higher carbon content coal. Comparison of the experimental data for the coals to model compounds using the Debye Equation showed that the maxima and minima of the experimental curves compared quite well, although the magnitudes did not.

• Research Organization: University of Southern Mississippi, Hattiesburg, MS (United States)
• OSTI ID: 7199234
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
AROMATICS
CARBONACEOUS MATERIALS
CHEMICAL BONDS
COAL
COHERENT SCATTERING
DIFFRACTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
MATERIALS
ORGANIC COMPOUNDS
POLYCYCLIC AROMATIC HYDROCARBONS
SCATTERING
STRUCTURAL CHEMICAL ANALYSIS
X-RAY DIFFRACTION