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Characterization of Algerian Hassi-Messaoud asphaltene structure using Raman spectrometry and X-ray diffraction

机译：拉曼光谱和X射线衍射表征阿尔及利亚Hassi-Messaoud沥青质结构

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摘要

Asphaltenes derived from Algerian oil wells were characterized by Raman spectrometry to investigate their molecular structures in solid-state. The aromatic sheet diameter (L_a) was estimated using the integrated intensities of the G and the D1 mode, along with the Tuinstra equation [Tuinstra F, Koenig JL. J Chem Phys 1970;53:l 126]. 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, L_c, gives rise to an estimate of eight asphaltene molecules in each asphaltene aggregate.
机译：通过拉曼光谱法对源自阿尔及利亚油井的沥青质进行了表征，以研究其固态的分子结构。使用G和D1模式的积分强度以及Tuinstra方程[Tuinstra F，Koenig JL。 J Chem Phys 1970； 53：1126]。三个阿尔及利亚Hassi-Messaoud沥青质样品获得的值与文献值的顺序相同，并且与X射线衍射结果一致。可以以自洽的方式将与G和D波段对应的拉曼光谱拟合高斯，洛伦兹和高斯/洛伦兹混合函数。一个三峰拟合过程发现，高斯/洛伦兹混合函数（G为高斯和D洛伦兹函数）是最佳组合。结合微晶高度L_c的X射线数据得出每个沥青质聚集体中八个沥青质分子的估计值。

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