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2007
ACL
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Y.Bouhadda, D.Bormann, E.Sheu, D.Bendedouch, A.Krallafa, M.Daou, 'Characterization of Algerian Hassi-Messaoud Asphaltene Structure Using Raman Spectrometry and X-ray Diffraction', Fuel 86 1855–1864 (2007) doi:10.1016/j.fuel.2006.12.006
Asphaltenes derived from Algerian oil wells were characterized by Raman spectrometry to investigate their molecular structures in solid-state. The aromatic sheet diameter (La) was estimated using the integrated intensities of the G and the D1 mode, along with the Tuinstra equation [F.Tuinstra, J.L.Koenig, J. Chem. Phys., 53 (1970), 1126]. The values obtained for three Algerian Hassi-Messaoud asphaltene samples are on the same order as the literature values and also consistent with the X-ray diffraction results. The Raman spectra corresponding to the G and the D bands can be fitted with Gaussian, Lorentzian, and Gaussian/Lorentzian hybrid functions in a self-consistent manner. A three peak fitting procedure found that the Gaussian/Lorentzian hybrid function with G being Gaussian and D Lorentzian is the best combination. Incorporation of the X-ray data on the height of the crystallite, Lc, gives rise to an estimate of 8 asphaltene molecules in each asphaltene aggregate
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