TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vučelić, D.
AU  - Šaban, M.
AU  - Wehner, H.
AU  - Vitorović, Dragomir K.
PY  - 1993
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/31
AB  - Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.
T2  - Organic Geochemistry
T1  - Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates
VL  - 20
IS  - 1
SP  - 69
EP  - 76
DO  - 10.1016/0146-6380(93)90082-M
ER  - 

@article{
author = "Jovančićević, Branimir and Vučelić, D. and Šaban, M. and Wehner, H. and Vitorović, Dragomir K.",
year = "1993",
abstract = "Evidence for catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale kerogen was found by investigating the liquid products obtained in the Micro Activity Test (MAT) pyrolysis of raw shale and its demineralized substrates. By comparing the corresponding fragmentograms of a demineralized sample with those of a substrate containing only silicate minerals, differences in the side-chain isomerisation of the steranes and triterpanes, and in the side-chain cleavage of the triaromatic steroids were observed. These findings corroborated the previous conclusion, based on MAT parameters and TG weight losses, that the catalytic effect of the indigenous mineral components during the pyrolysis of Aleksinac oil shale kerogen is very low. © 1993.",
journal = "Organic Geochemistry",
title = "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates",
volume = "20",
number = "1",
pages = "69-76",
doi = "10.1016/0146-6380(93)90082-M"
}

Jovančićević, B., Vučelić, D., Šaban, M., Wehner, H.,& Vitorović, D. K.. (1993). Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry, 20(1), 69-76.
https://doi.org/10.1016/0146-6380(93)90082-M

Jovančićević B, Vučelić D, Šaban M, Wehner H, Vitorović DK. Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates. in Organic Geochemistry. 1993;20(1):69-76.
doi:10.1016/0146-6380(93)90082-M .

Jovančićević, Branimir, Vučelić, D., Šaban, M., Wehner, H., Vitorović, Dragomir K., "Investigation of the catalytic effects of indigenous minerals in the pyrolysis of Aleksinac oil shale substrates: Steranes, triterpanes and triaromatic steroids in the pyrolysates" in Organic Geochemistry, 20, no. 1 (1993):69-76,
https://doi.org/10.1016/0146-6380(93)90082-M . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Šaban, M.
AU  - Wehner, H.
PY  - 1992
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/27
AB  - In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical methods. The differences in the gross compositions indicated an adsorption effect of both the carbonates and silicates in the examined oil shale. The maturation parameters, based on n-alkanes and isoprenoid alkanes pristane and phytane, indicated that bitumen 3 was of the highest, and bitumen 1 of the lowest, apparent maturity. The silicates were shown to have had a thermocatalytic effect on the organic matter of this sediment. Clay minerals had a catalytic effect primarily on sterane aromatization, rearrangement of steranes into diasteranes and their (20R) → (20S) isomerization. All evidence obtained by analysis of steranes and aromatic steroids suggested that the differences in bitumen compositions should be explained by the effect of clay minerals rather than by variations in the origin of the precursor biomass. © 1992.
T2  - Organic Geochemistry
T1  - Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens
VL  - 18
IS  - 4
SP  - 511
EP  - 519
DO  - 10.1016/0146-6380(92)90114-D
ER  - 

@article{
author = "Jovančićević, Branimir and Vitorović, Dragomir K. and Šaban, M. and Wehner, H.",
year = "1992",
abstract = "In order to evaluate the adsorption and catalytic effects of indigenous carbonates and silicates on the organic matter of Aleksinac oil shale, the free and the bound bitumens were isolated and analyzed by organic geochemical methods. The differences in the gross compositions indicated an adsorption effect of both the carbonates and silicates in the examined oil shale. The maturation parameters, based on n-alkanes and isoprenoid alkanes pristane and phytane, indicated that bitumen 3 was of the highest, and bitumen 1 of the lowest, apparent maturity. The silicates were shown to have had a thermocatalytic effect on the organic matter of this sediment. Clay minerals had a catalytic effect primarily on sterane aromatization, rearrangement of steranes into diasteranes and their (20R) → (20S) isomerization. All evidence obtained by analysis of steranes and aromatic steroids suggested that the differences in bitumen compositions should be explained by the effect of clay minerals rather than by variations in the origin of the precursor biomass. © 1992.",
journal = "Organic Geochemistry",
title = "Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens",
volume = "18",
number = "4",
pages = "511-519",
doi = "10.1016/0146-6380(92)90114-D"
}

Jovančićević, B., Vitorović, D. K., Šaban, M.,& Wehner, H.. (1992). Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens. in Organic Geochemistry, 18(4), 511-519.
https://doi.org/10.1016/0146-6380(92)90114-D

Jovančićević B, Vitorović DK, Šaban M, Wehner H. Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens. in Organic Geochemistry. 1992;18(4):511-519.
doi:10.1016/0146-6380(92)90114-D .

Jovančićević, Branimir, Vitorović, Dragomir K., Šaban, M., Wehner, H., "Evaluation of the effects of native minerals on the organic matter of Aleksinac oil shale based on the composition of free and bound bitumens" in Organic Geochemistry, 18, no. 4 (1992):511-519,
https://doi.org/10.1016/0146-6380(92)90114-D . .

TY  - JOUR
AU  - Šaban, M.
AU  - Jovančićević, Branimir
AU  - Saračević, S.
AU  - Hollerbach, A.
AU  - Vitorović, Dragomir K.
PY  - 1988
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/4
AB  - Several crude oils from the southeastern Yugoslav part of the Pannonian Basin are correlated for the first time on the basis of many bulk and specific parameters. The investigations involved 15 oils from oil-gas fields A and B and oil field C from the Banat depression and oil field D from South Bačka depression, and four oils from recently discovered oil shows E (the Kostolac depression). On the basis of structural group analysis and other bulk parameters such as API gravity, contents of asphaltenes and sulfur, as well as content of n-alkanes and pristane to phytane ratio, the examined oils are classified into four groups. However, the distributions and relative abundances of n-alkanes, isoprenoids (C19, C20), steranes, tricyclic terpanes and pentacyclic triterpanes, obtained by capillary GC and computerized GC-MS analysis, suggest classification of the examined oils into only two genetic types: A-D and E1-E4. The oils are of relatively high maturity. They are not biodegraded, except for both oils from field D and the oil A9. © 1987.
T2  - Organic Geochemistry
T1  - Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin
VL  - 13
IS  - 1-3
SP  - 325
EP  - 333
DO  - 10.1016/0146-6380(88)90052-6
ER  - 

@article{
author = "Šaban, M. and Jovančićević, Branimir and Saračević, S. and Hollerbach, A. and Vitorović, Dragomir K.",
year = "1988",
abstract = "Several crude oils from the southeastern Yugoslav part of the Pannonian Basin are correlated for the first time on the basis of many bulk and specific parameters. The investigations involved 15 oils from oil-gas fields A and B and oil field C from the Banat depression and oil field D from South Bačka depression, and four oils from recently discovered oil shows E (the Kostolac depression). On the basis of structural group analysis and other bulk parameters such as API gravity, contents of asphaltenes and sulfur, as well as content of n-alkanes and pristane to phytane ratio, the examined oils are classified into four groups. However, the distributions and relative abundances of n-alkanes, isoprenoids (C19, C20), steranes, tricyclic terpanes and pentacyclic triterpanes, obtained by capillary GC and computerized GC-MS analysis, suggest classification of the examined oils into only two genetic types: A-D and E1-E4. The oils are of relatively high maturity. They are not biodegraded, except for both oils from field D and the oil A9. © 1987.",
journal = "Organic Geochemistry",
title = "Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin",
volume = "13",
number = "1-3",
pages = "325-333",
doi = "10.1016/0146-6380(88)90052-6"
}

Šaban, M., Jovančićević, B., Saračević, S., Hollerbach, A.,& Vitorović, D. K.. (1988). Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin. in Organic Geochemistry, 13(1-3), 325-333.
https://doi.org/10.1016/0146-6380(88)90052-6

Šaban M, Jovančićević B, Saračević S, Hollerbach A, Vitorović DK. Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin. in Organic Geochemistry. 1988;13(1-3):325-333.
doi:10.1016/0146-6380(88)90052-6 .

Šaban, M., Jovančićević, Branimir, Saračević, S., Hollerbach, A., Vitorović, Dragomir K., "Correlative geochemical study of crude oils from southeastern and southern parts of the Pannonian Basin" in Organic Geochemistry, 13, no. 1-3 (1988):325-333,
https://doi.org/10.1016/0146-6380(88)90052-6 . .