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Native Vanadyl Complexes in Crude Oil as Polarizing Agents for in Situ Proton Dynamic Nuclear Polarization

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dc.contributor.author Gizatullin B.
dc.contributor.author Gafurov M.
dc.contributor.author Vakhin A.
dc.contributor.author Rodionov A.
dc.contributor.author Mamin G.
dc.contributor.author Orlinskii S.
dc.contributor.author Mattea C.
dc.contributor.author Stapf S.
dc.date.accessioned 2020-01-21T20:38:18Z
dc.date.available 2020-01-21T20:38:18Z
dc.date.issued 2019
dc.identifier.issn 0887-0624
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/157533
dc.description.abstract Copyright © 2019 American Chemical Society. The presence of paramagnetic species such as vanadyl complexes (VO2+) and free carbon radicals in petroleum disperse systems (PDSs) such as crude oil, bitumen, or kerogen causes significant interest of studying the structure of PDS, high-molecular weight components, and their effects on the physical and chemical properties of PDS products by magnetic resonance techniques. However, the lack of detailed studies keeps the exact structure, aggregation mechanism, and interaction with complex composites of the PDS still disputable. In this contribution, detailed electron paramagnetic resonance (EPR) and nuclear magnetic resonance (NMR) investigations, including advanced fast field cycling dynamic nuclear polarization, of heavy crude oil focused on vanadyl complexes are presented. A perceptible room-temperature 1H dynamic nuclear polarization (DNP) solid effect at the X-band (magnetic field of 300-400 mT corresponding to the EPR frequency of 9.5 GHz and NMR frequency of 14.6 MHz), with enhancement ±5, is observed at moderate microwave irradiation power in crude oil with a high concentration of VO2+, while no Overhauser DNP contribution is found. Using NMR T2-encoding, DNP spectra and molecular dynamics, two components are distinguished, from which the one with slower dynamics exhibits higher DNP enhancement via VO2+ complexes. The observed difference is discussed in terms of electron-nuclear interaction and relative parts of hyperpolarized nuclear spins using an advanced model for DNP data simulation.
dc.relation.ispartofseries Energy and Fuels
dc.title Native Vanadyl Complexes in Crude Oil as Polarizing Agents for in Situ Proton Dynamic Nuclear Polarization
dc.type Article
dc.relation.ispartofseries-issue 11
dc.relation.ispartofseries-volume 33
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 10923
dc.source.id SCOPUS08870624-2019-33-11-SID85075128799


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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