Oxidative Cleavage of Asphaltenes Under Mild Conditions
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Products from oxidation of asphaltenes by peracetic acid, sodium periodate, and potassium iodate were analyzed using IR spectroscopy and mass spectrometry. Oxidative destruction of asphaltenes increased the aromaticity in their molecular structures and the branching of aliphatic substituents on the polycondensed core. Occluded low-molecular-mass alkanes and cycloalkanes were released during the oxidation. The molecular mass of the asphaltenes changed as a function of the oxidant strength. Asphaltenes fragmented by the acetylene mechanism if the soft oxidant KIO3 was used.
Keywordsasphaltenes oxidation spectral coefficients gas chromatography-mass spectrometry molecular-mass distribution
The work was performed in the framework of a state task to FRC KazSC RAS. We thank staff members of the Distributed Collective Spectral Analytical Center for Studies of the Structure, Composition, and Properties of Compounds and Materials, Federal Research Center, Kazan Scientific Center, Russian Academy of Sciences, for assistance with the research.
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