Problems with the quantitative spectroscopic analysis of oxygen rich Czech coals

Conference · Fri Dec 01 04:00:00 EST 1995

OSTI ID:374618

Pavlikova, H; Machovic, V; Cerny, J ^[1]; Sebestova, E ^[2]

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1. Inst. of Chemical Technology, Prague (Czechoslovakia)
2. Inst. of Rock Structure and Mechanics, Prague (Czechoslovakia)

Solid state NMR and FTIR spectroscopies are two main methods used for the structural analysis of coals and their various products. Obtaining quantitative parameters from coals, such as arornaticity (f{sub a}) by the above mentioned methods can be a rather difficult task. Coal samples of various rank were chosen for the quantitative NMR, FTIR and EPR analyses. The aromaticity was obtained by the FTIR, {sup 13}C CP/MAS and SP/MAS NMR experiments. The content of radicals and saturation characteristics of coals were measured by EPR spectroscopy. The following problems have been discussed: 1. The relationship between the amount of free radicals (N{sub g}) and f{sub a} by NMR. 2. The f{sub a} obtained by solid state NMR and FTIR spectroscopies. 3. The differences between the f{sub a} measured by CP and SP/NMR experiments. 4. The relationship between the content of oxygen groups and the saturation responses of coals. The reliability of our results was checked by measuring the structural parameters of Argonne premium coals.

• Research Organization: North Dakota Univ., Grand Forks, ND (United States)
• OSTI ID: 374618
• Report Number(s): DOE/MC/30097--5161-Pt.2; CONF-9410458--Pt.2; ON: DE96011553
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
66 PHYSICS
CARBON 13
COAL
COAL RANK
INFRARED SPECTRA
MOLECULAR STRUCTURE
NMR SPECTRA
RADICALS