High-Field (3.4 T) ENDOR Investigation of Asphaltenes in Native Oil and Vanadyl Complexes by Asphaltene Adsorption on Alumina Surface
| Autor: | T. N. Yusupova, Yulia Ganeeva, Georgy Mamin, Sergei Orlinskii, Marat Gafurov, Fadis Murzakhanov, I. N. Gracheva |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Article Subject lcsh:QE1-996.5 Resonance 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Porphyrin Spectral line 0104 chemical sciences law.invention lcsh:Geology chemistry.chemical_compound Adsorption chemistry law General Earth and Planetary Sciences Physical chemistry High field 0210 nano-technology Electron paramagnetic resonance Aluminum oxide Asphaltene |
| Zdroj: | Geofluids, Vol 2019 (2019) |
| ISSN: | 1468-8123 1468-8115 |
| DOI: | 10.1155/2019/3812875 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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