The products resulting from the oxidative modification of petroleum asphaltenes were studied by Raman spectroscopy. Oxidizing agents such as peroxyacetic acid, potassium dichromate, and ammonium persulfate were used. Raman spectroscopy data indicated that the diameter of the aromatic sheets in asphaltenes varies widely depending on the calculation method applied. During chemical modification, the number of aromatic sheets decreases by several folds compared to native asphaltenes. The average number of aromatic rings per asphaltene sheet was found to be 8–10.
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Shabalin et al. (2025) studied this question.
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