J. Phys. IV France 7 (1997) C2-667-C2-668
A Study Using Sulfur K-Edge XAS of Bitumens, Asphaltenes, Maltenes and their Oxidation Products by Comparison with Model CompoundsV. Gotte1, A. Rogalev1, J. Goulon1, C. Goulon-Ginet1, 2, L. Michon3, R. Guilard3 and D. Martin4
1 ESRF, BP. 220, 38043 Grenoble, France
2 Université Joseph-Fourier, Faculté de Pharmacie, 38706 La Tronche, France
3 LIMSAG (UMR 9953), Université de Bourgogne, 6 boulevard Gabriel, 21100 Dijon, France
4 Centre de Recherche ELF - Solaize, BP. 22, 69360 Saint Symphorien d'Ozon, France
High resolution Sulfur K-edge XANES spectra have been recorded at the ESRF on "test" samples of bitumen, asphaltene and maltene fractions and various model compounds. All these fractions were found to have a low content of sulfidic species as opposed to thiophenic species and it is therefore not surprising that thermally oxidized samples (RTFOT) had also a low content (1%) of sulfoxides. This is indeed consistent with the absence of any detectable S=0 signature in the EXAFS spectra which were recorded over more than 1300 eV using the "undulator gap scan" technique.
© EDP Sciences 1997