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High temperature 1H-NMR study of coal and pitch at the early stages of carbonization

โœ Scribed by Kunio Miyazawa; Tetsuro Yokono; Yuzo Sanada

Publisher
Elsevier Science
Year
1979
Tongue
English
Weight
225 KB
Volume
17
Category
Article
ISSN
0008-6223

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โœฆ Synopsis

The temperature dependence of the 'H-NMR absorption in coats and pitches have been obtained using a pulsed Fourier transform NMR spectrometer with a high temperature probe. The samples as received were heated in the high temperature probe and NMR spectra were obtained simultaneously. With increasing temperature, the value of the line width at half-height (AH& of a brown coal decreases and then increases rapidly. On the other hand,tarpitchandtheycomponentofacoalindicatethatthevaluesof AHr~aremainsmalloverawidetemperaturerange. It is found that there is an excellent relation between the temperature dependence of AH,/2 and the optical texture of the mesophase.

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