Artículos de revistas
Structural Uniformity Of Toluene-insolubles From Heat-treated Coal Tar Pitch As Determined By Solid State13c Nmr Spectroscopy
Registro en:
Energy And Fuels. , v. 12, n. 3, p. 524 - 530, 1998.
8870624
2-s2.0-0032071979
Autor
Andresen J.M.
Luengo C.A.
Moinelo S.R.
Garcia R.
Snape C.E.
Institución
Resumen
A suite of coal tar pitches (CTPs) thermally treated to varying degrees and their toluene-insoluble (TI) fractions have been characterized by solid state 13C nuclear magnetic resonance (NMR). The nonprotonated aromatic carbon concentrations estimated from dipolar dephasing experiments using cross polarization with a relatively long contact time (5 ms) and the quantitatively reliable single-pulse excitation (SPE) technique were in good agreement and these concentrations were used to deduce the average ring sizes. Complementary information has been obtained from X-ray diffraction and thermogravimetry analysis. An increase in the degree of condensation for the aromatic structure was evident for the whole pitches upon heat treatment, consistent with the increasing concentrations of TIs and published liquid chromatographic results on the toluene-soluble fractions. 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