STRUCTURAL-ANALYSIS OF ALEKSINAC OIL-SHALE KEROGEN BY HIGH-RESOLUTIONSOLID-STATE C-13 NMR-SPECTROSCOPY

A sample of kerogen from Aleksinac oil shale was examined by high-reso lution solid-state C-13 n.m.r. spectroscopy. The presence and relative proportions of kerogen structural units were estimated using a combin ation of NQS and T-1 rho C methods with a peak-synthesis technique app lied to the C-13 CP-MAS spectrum. Relaxation parameters from these exp eriments were used to estimate differences in relative 'mobility' of v arious structural units. The kerogen was found to be highly aliphatic and to contain similar to 79% long-chain aliphatic plus alicyclic stru ctures, as well as similar to 9% aromatic structures. These findings a re in good agreement with the characterization of the same kerogen fro m its oxidation products.