Solid-state 13C NMR quantitative study of Eucalyptus tar pitches
2001
Prauchner, M.J. | Pasa, V.M.D. | Menezes, S.M.C. de
Solid-state 13C NMR has been important to overcome analysis difficulties arising from the low solubility of carbonaceous materia1s. Its use provides accurate information about these materia1s. In this work, resonance techniques involving magic angle spinning with cross-polarisation (CP/MAS) or sing1e pulse (SP/MAS) are used in conjunction with other analysis tools to quantitatively characterise Eucalyptus tar pitches and to follow their polymerisation reactions. The results showed that SP/MAS technique is more suitable for quantitative analyses, and that the pitches have a high content of aliphatic and oxygenated carbons. Moreover, they underwent thermal polymerisation, and the presence of AlCl3 or formaldehyde permitted the use of lower treatment temperatures. The polymerisation reactions were followed by aromaticity enhancements, giving rise to higher coke yields.
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