High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface
Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (mic...
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2019-01-01
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Series: | Geofluids |
Online Access: | http://dx.doi.org/10.1155/2019/3812875 |
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doaj-16b36a74536f452db8191a790983276a2020-11-25T01:49:06ZengHindawi-WileyGeofluids1468-81151468-81232019-01-01201910.1155/2019/38128753812875High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina SurfaceMarat Gafurov0Georgy Mamin1Irina Gracheva2Fadis Murzakhanov3Yulia Ganeeva4Tatiana Yusupova5Sergei Orlinskii6Kazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaKazan Federal University, 420008 Kazan, RussiaVanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 95 GHz, magnetic field of 3.4 T). Mims ENDOR spectra from 1H and 27Al nuclei are observed. ENDOR spectra are different for native oil and asphaltenes from one side and the adsorbed samples from the other side while no significant changes in X- (microwave frequency of 9 GHz) or W-band EPR spectra are found. The results allow supposing that vanadyl porphyrin complexes (at least in the studied asphaltene films) participate in the formation of asphaltene aggregates through the functional groups rather than π−π interactions. The data show the feasibility of the commercial pulsed ENDOR approaches for the investigation of crude oils and their constituents under external influence.http://dx.doi.org/10.1155/2019/3812875 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Marat Gafurov Georgy Mamin Irina Gracheva Fadis Murzakhanov Yulia Ganeeva Tatiana Yusupova Sergei Orlinskii |
spellingShingle |
Marat Gafurov Georgy Mamin Irina Gracheva Fadis Murzakhanov Yulia Ganeeva Tatiana Yusupova Sergei Orlinskii High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface Geofluids |
author_facet |
Marat Gafurov Georgy Mamin Irina Gracheva Fadis Murzakhanov Yulia Ganeeva Tatiana Yusupova Sergei Orlinskii |
author_sort |
Marat Gafurov |
title |
High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface |
title_short |
High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface |
title_full |
High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface |
title_fullStr |
High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface |
title_full_unstemmed |
High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface |
title_sort |
high-field (3.4 t) endor investigation of asphaltenes in native oil and vanadyl complexes by asphaltene adsorption on alumina surface |
publisher |
Hindawi-Wiley |
series |
Geofluids |
issn |
1468-8115 1468-8123 |
publishDate |
2019-01-01 |
description |
Vanadyl porphyrin complexes in asphaltenes from heavy (Karmalinskoye) oil and in asphaltene films obtained as a result of adsorption on the surface of aluminum oxide were studied by electron paramagnetic resonance (EPR) and double electron-nuclear resonance (ENDOR) in the W-band frequency range (microwave frequency of 95 GHz, magnetic field of 3.4 T). Mims ENDOR spectra from 1H and 27Al nuclei are observed. ENDOR spectra are different for native oil and asphaltenes from one side and the adsorbed samples from the other side while no significant changes in X- (microwave frequency of 9 GHz) or W-band EPR spectra are found. The results allow supposing that vanadyl porphyrin complexes (at least in the studied asphaltene films) participate in the formation of asphaltene aggregates through the functional groups rather than π−π interactions. The data show the feasibility of the commercial pulsed ENDOR approaches for the investigation of crude oils and their constituents under external influence. |
url |
http://dx.doi.org/10.1155/2019/3812875 |
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