Microstrustureof asphaltenes of bituminous oils

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Abstract

The microstructure and functional composition of asphaltenes of bituminous oils from the Ashalchinskoye (Permian), Usinskoye (Permian-Carbon) and Nurlatskoye (Devonian) fields (referred to here as the Ashalchinskaya, Usinskaya and Nurlatskaya oils, respectively) and their high- and low-molecular components are studied using infrared spectroscopy and scanning and transmission electron microscopy. It is shown that asphaltenes of the Ashalchinskaya oil are characterized by smooth surface, while those of the Usinskaya and Nurlatskaya oils – by rough and porous surfaces. The sizes of asphaltene nanoaggregates of the Usinskaya and Nurlatskaya oils are smaller than those of the Ashalchinskaya oil, while the asphaltene nanoaggregates of oils from the Ashalchinskaya and Nurlatskaya oils form disordered tangled structures. A distinctive feature of the Usinskaya oil asphaltenes is the presence of better-ordered layers, which are typically associated with crystal-like formations. Asphaltenes of Ashalchinskaya and Nurlatskaya oils are characterized by enhanced aromaticity and branching of aliphatic substituents of their macromolecules, as well as a high relative content of the fragments with a sulfoxide group. Their high-molecular asphaltenes are less aromatic than the low-molecular ones, and the conditional content of carbonyl and sulfoxide groups in their composition is lower. The content of aliphatic fragments and those containing carbonyl groups in the Usinskaya oil asphaltenes is higher. The content of sulfoxide and carbonyl groups in high-molecular asphaltenes of this oil is lower than that in low-molecular asphaltenes, while the content of aromatic fragments is, on the contrary, higher.

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About the authors

E. Yu. Kovalenko

Institute of Petroleum Chemistry of Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: kovalenko@ipc.tsc.ru
Russian Federation, 634055, Tomsk

T. V. Cheshkova

Institute of Petroleum Chemistry of Siberian Branch of the Russian Academy of Sciences

Email: chtv12@mail.ru
Russian Federation, 634055, Tomsk

K. A. Cherednichenko

National University of Oil and Gas “Gubkin University”

Email: cherednichenko.k@gubkin.ru
Russian Federation, 119991, Moscow

T. A. Sagachenko

Institute of Petroleum Chemistry of Siberian Branch of the Russian Academy of Sciences

Email: dissovet@ipc.tsc.ru
Russian Federation, 634055, Tomsk

R. S. Min

Institute of Petroleum Chemistry of Siberian Branch of the Russian Academy of Sciences

Email: rsm@ipc.tsc.ru
Russian Federation, 634055, Tomsk

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Supplementary files

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2. Fig. 1. IR spectra of asphaltenes (a) of bituminous oils I–III and their high- (b) and low-molecular (c) components.

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3. Fig. 2. SEM micrographs of asphaltenes (a) – (c) of bituminous oils I–III and their high- (g) – (e) and low-molecular (g) – (i) components at a resolution of 200 µm.

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4. Fig. 3. TEM image of asphaltene particles of bituminous oils I–III at a resolution of 100 nm (a)–(c), at a resolution of 10 nm (g)–(i) and particle size distribution (g)–(e).

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5. Fig. 4. TEM image of asphaltene particles of high- and low-molecular components of oil II at a resolution of 100 nm (a), (c) and at a resolution of 10 nm (b), (d).

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