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Application of high-field, high-resolution 13C CP/MAS n.m.r. spectroscopy to the structural analysis of Yallourn coal

✍ Scribed by Yasuo Ohtsuka; Tsunenori Nozawa; Akira Tomita; Yasukatsu Tamai; Masahiro Hatano

Publisher
Elsevier Science
Year
1984
Tongue
English
Weight
584 KB
Volume
63
Category
Article
ISSN
0016-2361

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✦ Synopsis

High-field, high-resolution 13C cross-polarization and magic angle spinning nuclear magnetic resonance experiments are reported on Yallourn brown coal and on products obtained from the coal by heat treatment. The spectral resolution at 75 MHz is much improved over that previously reported for lower frequencies. A comparison of experimental and simulated spectra allowed the distribution of carbon types in Yallourn coal to be determined; the carbon aromaticity is 42%, and 30% of the carbon is present in methylene groups. The method was also used to determine structural changes during pyrolysis. At 773 K, aliphatic carbon structures are lost, but higher temperatures are necessary to decompose phenolic structures.

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