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C-13 NMR on solid samples and its application to coal science

Conference · · AIP Conf. Proc.; (United States)
OSTI ID:6356318
; ; ;
/sup 13/C nmr spectra that approach high-resolution quality can now be obtained on solids by using high-power 1H decoupling (for eliminating the major line broadening due to /sup 1/H-/sup 13/C dipole-dipole interactions), /sup 1/H-/sup 13/C cross polarization (for circumventing the /sup 13/C T/sub 1/ bottleneck) and magic-angle spinning (for eliminating line broadening due to chemical shift anisotropy). /sup 13/C spectra with rather sharp lines are obtained for crystalline samples. For coals and other very complex mixtures, the occurrence of many different, but very similar, chemical architectures renders for most samples two rather broad resonances bands (the aromatic/olefinic carbon band and the aliphatic carbon band). Additional structural information can be obtained from the /sup 13/C nmr spectrum if the coal has an unusually simple distribution of carbon bypes or if more sophisticated techniques are employed. Progress, limitations and propsects for solving important problems in coal science by the /sup 13/C nmr technique are discussed.
Research Organization:
Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523
OSTI ID:
6356318
Report Number(s):
CONF-8006116-
Conference Information:
Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 70:1
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
CARBON 13
CARBON ISOTOPES
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
COAL
ENERGY SOURCES
EVEN-ODD NUCLEI
FOSSIL FUELS
FUELS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MATERIALS
NMR SPECTRA
NUCLEAR MAGNETIC RESONANCE
NUCLEI
POLARIZATION
RESONANCE
SPECTRA
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS