Structural variations and evidence of segmental motion in the aliphatic region in coals observed with dipolar-dephasing NMR

The authors report the structural variations of a number of coals and coal macerals. Through the time constants associated with dipolar-dephasing techniques, CP/MAS spectral data reveal the presence of segmental motion in certain low-rank coal samples. The motion detailed is in the aliphatic region...

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Veröffentlicht in:	Energy & fuels 1987-01, Vol.1 (1), p.50-55
Hauptverfasser:	Soderquist, Arlen, Burton, David J, Pugmire, Ronald J, Beeler, Alvin J, Grant, David M, Durand, B, Huk, A. Y
Format:	Artikel
Sprache:	eng
Schlagworte:	01 COAL, LIGNITE, AND PEAT Applied sciences AROMATICS CARBON 13 CARBON ISOTOPES CARBONACEOUS MATERIALS COAL Coal and derived products COAL RANK COALIFICATION DENSITY Energy ENERGY SOURCES EVEN-ODD NUCLEI Exact sciences and technology FOSSIL FUELS FUELS ISOTOPES LIGHT NUCLEI MACERALS MAGNETIC RESONANCE MATERIALS NUCLEAR MAGNETIC RESONANCE NUCLEI ORGANIC COMPOUNDS PHYSICAL PROPERTIES RESONANCE STABLE ISOTOPES 010600 > Coal, Lignite, & Peat-- Properties & Composition STRUCTURAL CHEMICAL ANALYSIS Structure, chemical and physical properties
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Zusammenfassung:	The authors report the structural variations of a number of coals and coal macerals. Through the time constants associated with dipolar-dephasing techniques, CP/MAS spectral data reveal the presence of segmental motion in certain low-rank coal samples. The motion detailed is in the aliphatic region and is thought to be due to CH/sub 2/ groups associated with hydroaromatic and/or polymethylene structural units. 35 references, 4 figures, 6 tables.
ISSN:	0887-0624 1520-5029
DOI:	10.1021/ef00001a009