Application of 1H pulse n.m.r. to the determination of molecular and macromolecular phases in coals |
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| Authors: | Anna Marzec Antoni Jurkiewicz Narcyz Pislewski |
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| Affiliation: | 1. Department of Petroleum and Coal Chemistry, Polish Academy of Sciences, 44-100 Gliwice, 1 Maja 62 St., Poland;7. lnstitute of Molecular Physics, Polish Academy of Sciences 60-179 Poznan, Smoluchowskiego 17/19 St., Poland |
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| Abstract: | 1H n.m.r. free-induction decay (FID), after single 90 ° pulse excitation has been studied for bituminous and subbituminous coals and after saturation with deuterated pyridine and sulphuric acid. FID signals were broken down into Gaussian and Lorentzian components and their initial amplitudes determined. The ratio of hydrogen atoms occuring in the mobile phase (HMPh) and in the immobile phase (HIPh) were calculated. The ratios, HMPh:HIPh, measured in the presence of pyridine-d5 and D2SO4 delimit the range where the ratio of molecules:macromolecules occuring in coals can be found. The procedure described in this Paper can be used to estimate the total content of molecules (extractable and non-extractable) occuring in coals. |
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| Keywords: | coal instrumental methods of analysis n.m.r. spectra molecules |
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