Characterization of the Argonne premium coals by using NMR of hydrogen and carbon-13 and FTIR spectroscopy

Technical Report · Thu Aug 01 04:00:00 EDT 1991

OSTI ID:5262385

dela Rosa, L C

Argonne Premium Coal sample Program coals were analyzed by using a variety of transient techniques in NMR of {sup 1}H (relaxation measurements, spin counting) and {sup 13}C in coals as well as by using Fourier transform infrared spectroscopy. The quantitative validity of the techniques was evaluated. The true lineshape of the on-resonance {sup 1}H free induction decay (FID) for coals with <2% moisture content was determined by solid echo and described by a superposition of Gaussian and Lorentzian decay functions, corresponding to rigid protons in the macrostructure of coal and to fragments in the coal exhibiting hindered molecular mobility, respectively. For wet coals, an additional slowly decaying Lorentzian fraction must be added to the description of the FID. The species responsible for the longest decay was identified. The NMR quantitation results compared favorably with the results obtained by chemical and thermogravimetric analyses. 99 refs., 16 figs., 2 tabs.

• Research Organization: Ames Lab., IA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5262385
• Report Number(s): IS-T-1423; ON: DE91018124
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
&amp; Peat-- Properties &amp; Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
AROMATICS
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
COAL
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FOURIER TRANSFORM SPECTROMETERS
FUELS
HYDROGEN 1
HYDROGEN ISOTOPES
INFRARED SPECTRA
ISOTOPES
LIGHT NUCLEI
MATERIALS
MEASURING INSTRUMENTS
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
SPECTRA
SPECTROMETERS
STABLE ISOTOPES