Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation
Nema prikaza
Autori
Premović, Pavle I.Tonsa, Ivana R.
Pajovic, MT
Lopez, Liliana
Monaco, SL
Dordevic, DM
Pavlović, Mirjana S.
Članak u časopisu
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of the kerogens isolated from the La Luna (Venezuela), Maganik(Montenegro) and Serpiano (Switzerland) bituminous rocks at 150 and 250 degreesC for 1 to 20 days in the presence of air. During the thermal treatment of the kerogens the vanadyl porphyrins resonance signals decrease monotonically and become quite small after six days of heating. Concomitantly, new vanadyl signals appear, and, at longer heating times, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversion of vanadyl porphyrins are observed under the same experimental conditions for the asphaltenes extracted from the La Luna and Serpiano rocks, and the floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests t...hat these are of non-porphyrin type. For comparison, a study was conducted on the Western Kentucky No. 9 coal enriched with vanadium (up to 800 ppm) from six mines. All coal samples show only the presence of predominant vanadyl-non-porphyrin compounds similar to those generated through laboratory heating of the kerogens/asphaltenes in air. In addition, some samples also contain a minor amount of vanadyl porphyrins. (C) 2001 Elsevier Science Ltd. All rights reserved.
Ključne reči:
vanadyl porphyrins / kerogen / electron spin resonanceIzvor:
Fuel, 2001, 80, 5, 635-639
DOI: 10.1016/S0016-2361(00)00141-1
ISSN: 0016-2361
WoS: 000167088700003
Scopus: 2-s2.0-0035865025
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Premović, Pavle I. AU - Tonsa, Ivana R. AU - Pajovic, MT AU - Lopez, Liliana AU - Monaco, SL AU - Dordevic, DM AU - Pavlović, Mirjana S. PY - 2001 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2416 AB - Thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of the kerogens isolated from the La Luna (Venezuela), Maganik(Montenegro) and Serpiano (Switzerland) bituminous rocks at 150 and 250 degreesC for 1 to 20 days in the presence of air. During the thermal treatment of the kerogens the vanadyl porphyrins resonance signals decrease monotonically and become quite small after six days of heating. Concomitantly, new vanadyl signals appear, and, at longer heating times, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversion of vanadyl porphyrins are observed under the same experimental conditions for the asphaltenes extracted from the La Luna and Serpiano rocks, and the floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests that these are of non-porphyrin type. For comparison, a study was conducted on the Western Kentucky No. 9 coal enriched with vanadium (up to 800 ppm) from six mines. All coal samples show only the presence of predominant vanadyl-non-porphyrin compounds similar to those generated through laboratory heating of the kerogens/asphaltenes in air. In addition, some samples also contain a minor amount of vanadyl porphyrins. (C) 2001 Elsevier Science Ltd. All rights reserved. T2 - Fuel T1 - Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation VL - 80 IS - 5 SP - 635 EP - 639 DO - 10.1016/S0016-2361(00)00141-1 ER -
@article{ author = "Premović, Pavle I. and Tonsa, Ivana R. and Pajovic, MT and Lopez, Liliana and Monaco, SL and Dordevic, DM and Pavlović, Mirjana S.", year = "2001", abstract = "Thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of the kerogens isolated from the La Luna (Venezuela), Maganik(Montenegro) and Serpiano (Switzerland) bituminous rocks at 150 and 250 degreesC for 1 to 20 days in the presence of air. During the thermal treatment of the kerogens the vanadyl porphyrins resonance signals decrease monotonically and become quite small after six days of heating. Concomitantly, new vanadyl signals appear, and, at longer heating times, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversion of vanadyl porphyrins are observed under the same experimental conditions for the asphaltenes extracted from the La Luna and Serpiano rocks, and the floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests that these are of non-porphyrin type. For comparison, a study was conducted on the Western Kentucky No. 9 coal enriched with vanadium (up to 800 ppm) from six mines. All coal samples show only the presence of predominant vanadyl-non-porphyrin compounds similar to those generated through laboratory heating of the kerogens/asphaltenes in air. In addition, some samples also contain a minor amount of vanadyl porphyrins. (C) 2001 Elsevier Science Ltd. All rights reserved.", journal = "Fuel", title = "Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation", volume = "80", number = "5", pages = "635-639", doi = "10.1016/S0016-2361(00)00141-1" }
Premović, P. I., Tonsa, I. R., Pajovic, M., Lopez, L., Monaco, S., Dordevic, D.,& Pavlović, M. S.. (2001). Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation. in Fuel, 80(5), 635-639. https://doi.org/10.1016/S0016-2361(00)00141-1
Premović PI, Tonsa IR, Pajovic M, Lopez L, Monaco S, Dordevic D, Pavlović MS. Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation. in Fuel. 2001;80(5):635-639. doi:10.1016/S0016-2361(00)00141-1 .
Premović, Pavle I., Tonsa, Ivana R., Pajovic, MT, Lopez, Liliana, Monaco, SL, Dordevic, DM, Pavlović, Mirjana S., "Electron spin resonance study of the kerogen/asphaltene vanadyl porphyrins: air oxidation" in Fuel, 80, no. 5 (2001):635-639, https://doi.org/10.1016/S0016-2361(00)00141-1 . .