Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study
Apstrakt
The thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of kerogens, isolated from the La Luna (Venezuela) anti Serpiano (Switzerland) bituminous rocks, at 250 degrees C 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 6 days of heating. Concomitantly, new vanadyl signals appear and, at longer heating limes, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversions of vanadyl porphyrins are observed under the same experimental conditions for asphaltenes extracted from the La Luna and Serpiano rocks, and floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and the vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests that the latter are of a non-po...rphyrin type. For comparison a study was conducted on Western Kentucky No. 9 coal enriched with vanadium ( GT 400 ppm) from six mines. AII the coal sam!,les:show only the presence of predominant by non-porphyrin vanadyl compounds, similar to those generated through laboratory heating of the kerogens/asphaltenes in ail: In addition, some samples also contain a minor amount of vanadyl porphyrins.
Ključne reči:
vanadyl porphyrins / kerogen / asphaltene / incorporation / electron spin resonanceIzvor:
Journal of the Serbian Chemical Society, 2000, 65, 2, 113-121Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Premović, Pavle I. AU - Tonsa, Ivana R. AU - Dordevic, DM AU - Pavlović, Mirjana S. PY - 2000 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2327 AB - The thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of kerogens, isolated from the La Luna (Venezuela) anti Serpiano (Switzerland) bituminous rocks, at 250 degrees C 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 6 days of heating. Concomitantly, new vanadyl signals appear and, at longer heating limes, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversions of vanadyl porphyrins are observed under the same experimental conditions for asphaltenes extracted from the La Luna and Serpiano rocks, and floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and the vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests that the latter are of a non-porphyrin type. For comparison a study was conducted on Western Kentucky No. 9 coal enriched with vanadium ( GT 400 ppm) from six mines. AII the coal sam!,les:show only the presence of predominant by non-porphyrin vanadyl compounds, similar to those generated through laboratory heating of the kerogens/asphaltenes in ail: In addition, some samples also contain a minor amount of vanadyl porphyrins. T2 - Journal of the Serbian Chemical Society T1 - Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study VL - 65 IS - 2 SP - 113 EP - 121 UR - https://hdl.handle.net/21.15107/rcub_vinar_2327 ER -
@article{ author = "Premović, Pavle I. and Tonsa, Ivana R. and Dordevic, DM and Pavlović, Mirjana S.", year = "2000", abstract = "The thermal behavior of vanadyl porphyrins was studied by electron spin resonance during heating of kerogens, isolated from the La Luna (Venezuela) anti Serpiano (Switzerland) bituminous rocks, at 250 degrees C 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 6 days of heating. Concomitantly, new vanadyl signals appear and, at longer heating limes, dominate the spectrum. It is suggested that the secondary vanadyl species must have been formed from vanadyl porphyrins. Similar conversions of vanadyl porphyrins are observed under the same experimental conditions for asphaltenes extracted from the La Luna and Serpiano rocks, and floating asphalt from the Dead Sea (Israel). A comparison of the spin-Hamiltonian parameters for vanadyl porphyrins and the vanadyl compounds obtained during pyrolysis of the kerogens/asphaltenes suggests that the latter are of a non-porphyrin type. For comparison a study was conducted on Western Kentucky No. 9 coal enriched with vanadium ( GT 400 ppm) from six mines. AII the coal sam!,les:show only the presence of predominant by non-porphyrin vanadyl compounds, similar to those generated through laboratory heating of the kerogens/asphaltenes in ail: In addition, some samples also contain a minor amount of vanadyl porphyrins.", journal = "Journal of the Serbian Chemical Society", title = "Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study", volume = "65", number = "2", pages = "113-121", url = "https://hdl.handle.net/21.15107/rcub_vinar_2327" }
Premović, P. I., Tonsa, I. R., Dordevic, D.,& Pavlović, M. S.. (2000). Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study. in Journal of the Serbian Chemical Society, 65(2), 113-121. https://hdl.handle.net/21.15107/rcub_vinar_2327
Premović PI, Tonsa IR, Dordevic D, Pavlović MS. Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study. in Journal of the Serbian Chemical Society. 2000;65(2):113-121. https://hdl.handle.net/21.15107/rcub_vinar_2327 .
Premović, Pavle I., Tonsa, Ivana R., Dordevic, DM, Pavlović, Mirjana S., "Air oxidation of the kerogen/asphaltene vanadyl porphyrins: an electron spin resonance study" in Journal of the Serbian Chemical Society, 65, no. 2 (2000):113-121, https://hdl.handle.net/21.15107/rcub_vinar_2327 .