W-band EPR of vanadyl complexes aggregates on the surface of Al2O3

Thermal Methods for Enhanced Oil Recovery: Laboratory Testing, Simulation and Oilfields Applications 2017

Mamin, G.^1 ; Gafurov, M.^1 ; Galukhin, A.^1 ; Gracheva, I.^1 ; Murzakhanov, F.^1 ; Rodionov, A.^1 ; Orlinskii, S.^1

Kazan Federal University, 18 Kremlevskaya Str., Kazan, Russia^1

关键词: Different origins;    Electron paramagnetic resonances (EPR);    EPR parameters;    Higher frequencies;    Metallo-porphyrins;    Paramagnetic complexes;    Structural characterization;    Vanadyl complexes;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/155/1/012005/pdf
DOI  :  10.1088/1755-1315/155/1/012005

来源: IOP

【 摘 要 】

Structural characterization of metalloporphyrins, asphaltenes and their aggregates in complex systems such as native hydrocarbons is in the focus of scientific and industrial interests since many years. We present W-band (95 GHz) electron paramagnetic resonance (EPR) study in the magnetic field of about 3.4 T and temperature of 100 K for Karmalinskoe oil, asphaltens and asphaltenes deposited on the surface of Al2O3. Features of the obtained spectra are described. Shift to the higher frequencies allows to separate spectrally the contributions from paramagnetic complexes of different origin and define the EPR parameters more accurately comparing to the conventional X-band (9 GHz). Changes of the EPR parameters are tracked. We suggest that the proposed approach can be used for the investigation of structure of vanadyl complexes aggregates in crude oil and their fractions.