TY  - CONF
AU  - Beškoski, Vladimir
AU  - Gojgić-Cvijović, Gordana
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
AU  - Vrvić, Miroslav
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5203
AB  - Poster presented at: 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
T1  - Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal
UR  - https://hdl.handle.net/21.15107/rcub_cer_5203
ER  - 

@conference{
author = "Beškoski, Vladimir and Gojgić-Cvijović, Gordana and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir and Vrvić, Miroslav",
year = "2013",
abstract = "Poster presented at: 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile",
title = "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal",
url = "https://hdl.handle.net/21.15107/rcub_cer_5203"
}

Beškoski, V., Gojgić-Cvijović, G., Cvetković, O., Dragutinović, V., Spasić, S., Vitorović, D.,& Vrvić, M.. (2013). Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. .
https://hdl.handle.net/21.15107/rcub_cer_5203

Beškoski V, Gojgić-Cvijović G, Cvetković O, Dragutinović V, Spasić S, Vitorović D, Vrvić M. Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. 2013;.
https://hdl.handle.net/21.15107/rcub_cer_5203 .

Beškoski, Vladimir, Gojgić-Cvijović, Gordana, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, Vrvić, Miroslav, "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal" (2013),
https://hdl.handle.net/21.15107/rcub_cer_5203 .

TY  - CONF
AU  - Beškoski, Vladimir
AU  - Gojgić-Cvijović, Gordana
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
AU  - Vrvić, Miroslav
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5202
PB  - Chile : Gecamin
C3  - Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
T1  - Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal
SP  - 250
UR  - https://hdl.handle.net/21.15107/rcub_cer_5202
ER  - 

@conference{
author = "Beškoski, Vladimir and Gojgić-Cvijović, Gordana and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir and Vrvić, Miroslav",
year = "2013",
publisher = "Chile : Gecamin",
journal = "Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile",
title = "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal",
pages = "250",
url = "https://hdl.handle.net/21.15107/rcub_cer_5202"
}

Beškoski, V., Gojgić-Cvijović, G., Cvetković, O., Dragutinović, V., Spasić, S., Vitorović, D.,& Vrvić, M.. (2013). Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile
Chile : Gecamin., 250.
https://hdl.handle.net/21.15107/rcub_cer_5202

Beškoski V, Gojgić-Cvijović G, Cvetković O, Dragutinović V, Spasić S, Vitorović D, Vrvić M. Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal. in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile. 2013;:250.
https://hdl.handle.net/21.15107/rcub_cer_5202 .

Beškoski, Vladimir, Gojgić-Cvijović, Gordana, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, Vrvić, Miroslav, "Possibilities of ‘siliceous’ bacteria as biological agents for silicate removal" in Proceedings - 20th International Biohydrometallurgy Symposium (IBS 2013), October 8-11, 2013, Antofagasta, Chile (2013):250,
https://hdl.handle.net/21.15107/rcub_cer_5202 .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Milić, Jelena
AU  - Beškoski, Vladimir
AU  - Dragutinović, V.
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5699
AB  - Amount of reserves of oil shale in Serbia are up to about 6 billion tons (estimated), while the largest deposit (approx. 1/3 of total quantity) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia (not exploited at the moment). Shale from Aleksinac is an immature Oligocene-Miocene lacustrine sediment. The average content of the organic substance in Aleksinac shale is about 20 %, with a dominant share of kerogen (the content of bitumen is less than 5 %). The mineral part comprises about 20 % carbonates, approximately 10 % pyrite and the rest are aluminosilicates. In our lab researches relating to the "quality improvement" of raw shale from Aleksinac that have been made for near 30 years, for depyritization as "non-destructive reagents" we use strains of chemolithoautotrophic thionic bacteria Acidithiobacillus ferrooxidans. In a large number of experimental variations of the "shake flask test technique" the best results have been obtained for depyritization (more than 95%). Combining AFM surface imaging and leaching analysis following bacterial colonisation of oil shale layers demonstrates that an initial attachment to the surface is necessary for the leaching and that later on, once a sufficient concentration of Fe2+ ions in the solution is achieved, cells detach to become free cells. and leaching occurs primarily by the Fe3+. Benefits of the bacterial depyritization are primarily in order to reduce aero pollution and corrosivity, and also this green process must be low cost green bio/technology  for biobeneficiation of oil shale.
T1  - Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale
UR  - https://hdl.handle.net/21.15107/rcub_cer_5699
ER  - 

@conference{
author = "Vrvić, Miroslav and Milić, Jelena and Beškoski, Vladimir and Dragutinović, V. and Spasić, Snežana and Vitorović, Dragomir",
year = "2012",
abstract = "Amount of reserves of oil shale in Serbia are up to about 6 billion tons (estimated), while the largest deposit (approx. 1/3 of total quantity) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia (not exploited at the moment). Shale from Aleksinac is an immature Oligocene-Miocene lacustrine sediment. The average content of the organic substance in Aleksinac shale is about 20 %, with a dominant share of kerogen (the content of bitumen is less than 5 %). The mineral part comprises about 20 % carbonates, approximately 10 % pyrite and the rest are aluminosilicates. In our lab researches relating to the "quality improvement" of raw shale from Aleksinac that have been made for near 30 years, for depyritization as "non-destructive reagents" we use strains of chemolithoautotrophic thionic bacteria Acidithiobacillus ferrooxidans. In a large number of experimental variations of the "shake flask test technique" the best results have been obtained for depyritization (more than 95%). Combining AFM surface imaging and leaching analysis following bacterial colonisation of oil shale layers demonstrates that an initial attachment to the surface is necessary for the leaching and that later on, once a sufficient concentration of Fe2+ ions in the solution is achieved, cells detach to become free cells. and leaching occurs primarily by the Fe3+. Benefits of the bacterial depyritization are primarily in order to reduce aero pollution and corrosivity, and also this green process must be low cost green bio/technology  for biobeneficiation of oil shale.",
title = "Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale",
url = "https://hdl.handle.net/21.15107/rcub_cer_5699"
}

Vrvić, M., Milić, J., Beškoski, V., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2012). Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale. .
https://hdl.handle.net/21.15107/rcub_cer_5699

Vrvić M, Milić J, Beškoski V, Dragutinović V, Spasić S, Vitorović D. Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale. 2012;.
https://hdl.handle.net/21.15107/rcub_cer_5699 .

Vrvić, Miroslav, Milić, Jelena, Beškoski, Vladimir, Dragutinović, V., Spasić, Snežana, Vitorović, Dragomir, "Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale" (2012),
https://hdl.handle.net/21.15107/rcub_cer_5699 .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Milić, Jelena
AU  - Beškoski, Vladimir
AU  - Dragutinović, V.
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5698
AB  - Amount of reserves of oil shale in Serbia are up to about 6 billion tons (estimated), while the largest deposit (approx. 1/3 of total quantity) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia (not exploited at the moment). Shale from Aleksinac is an immature Oligocene-Miocene lacustrine sediment. The average content of the organic substance in Aleksinac shale is about 20 %, with a dominant share of kerogen (the content of bitumen is less than 5 %). The mineral part comprises about 20 % carbonates, approximately 10 % pyrite and the rest are aluminosilicates. In our lab researches relating to the "quality improvement" of raw shale from Aleksinac that have been made for near 30 years, for depyritization as "non-destructive reagents" we use strains of chemolithoautotrophic thionic bacteria Acidithiobacillus ferrooxidans. In a large number of experimental variations of the "shake flask test technique" the best results have been obtained for depyritization (more than 95%). Combining AFM surface imaging and leaching analysis following bacterial colonisation of oil shale layers demonstrates that an initial attachment to the surface is necessary for the leaching and that later on, once a sufficient concentration of Fe2+ ions in the solution is achieved, cells detach to become free cells. and leaching occurs primarily by the Fe3+. Benefits of the bacterial depyritization are primarily in order to reduce aero pollution and corrosivity, and also this green process must be low cost green bio/technology  for biobeneficiation of oil shale.
PB  - Jordan : Natural Resource Authority
C3  - Jordan International Oil Shale Symposium 2012, May 7-9 2012, Dead Sea, Jordan
T1  - Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale
UR  - https://hdl.handle.net/21.15107/rcub_cer_5698
ER  - 

@conference{
author = "Vrvić, Miroslav and Milić, Jelena and Beškoski, Vladimir and Dragutinović, V. and Spasić, Snežana and Vitorović, Dragomir",
year = "2012",
abstract = "Amount of reserves of oil shale in Serbia are up to about 6 billion tons (estimated), while the largest deposit (approx. 1/3 of total quantity) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia (not exploited at the moment). Shale from Aleksinac is an immature Oligocene-Miocene lacustrine sediment. The average content of the organic substance in Aleksinac shale is about 20 %, with a dominant share of kerogen (the content of bitumen is less than 5 %). The mineral part comprises about 20 % carbonates, approximately 10 % pyrite and the rest are aluminosilicates. In our lab researches relating to the "quality improvement" of raw shale from Aleksinac that have been made for near 30 years, for depyritization as "non-destructive reagents" we use strains of chemolithoautotrophic thionic bacteria Acidithiobacillus ferrooxidans. In a large number of experimental variations of the "shake flask test technique" the best results have been obtained for depyritization (more than 95%). Combining AFM surface imaging and leaching analysis following bacterial colonisation of oil shale layers demonstrates that an initial attachment to the surface is necessary for the leaching and that later on, once a sufficient concentration of Fe2+ ions in the solution is achieved, cells detach to become free cells. and leaching occurs primarily by the Fe3+. Benefits of the bacterial depyritization are primarily in order to reduce aero pollution and corrosivity, and also this green process must be low cost green bio/technology  for biobeneficiation of oil shale.",
publisher = "Jordan : Natural Resource Authority",
journal = "Jordan International Oil Shale Symposium 2012, May 7-9 2012, Dead Sea, Jordan",
title = "Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale",
url = "https://hdl.handle.net/21.15107/rcub_cer_5698"
}

Vrvić, M., Milić, J., Beškoski, V., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2012). Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale. in Jordan International Oil Shale Symposium 2012, May 7-9 2012, Dead Sea, Jordan
Jordan : Natural Resource Authority..
https://hdl.handle.net/21.15107/rcub_cer_5698

Vrvić M, Milić J, Beškoski V, Dragutinović V, Spasić S, Vitorović D. Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale. in Jordan International Oil Shale Symposium 2012, May 7-9 2012, Dead Sea, Jordan. 2012;.
https://hdl.handle.net/21.15107/rcub_cer_5698 .

Vrvić, Miroslav, Milić, Jelena, Beškoski, Vladimir, Dragutinović, V., Spasić, Snežana, Vitorović, Dragomir, "Beneficiation oil shale by bacterial depyritization as possible green technology: Bioprocessing on laboratory scale" in Jordan International Oil Shale Symposium 2012, May 7-9 2012, Dead Sea, Jordan (2012),
https://hdl.handle.net/21.15107/rcub_cer_5698 .

TY  - JOUR
AU  - Dragutinović, Vesna
AU  - Cvetković, Olga
AU  - Vitorović, Dragomir
PY  - 2011
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/937
AB  - The déminéralisation experiments are aimed at preparing native sedimentary organic matter concentrates, consisting mainly of insoluble kerogen. Initial desilicification experiments of three Aleksinac (Serbia) oil shale samples were carried out with the help of Bacillus circulons J ordan. The process was followed by pH measurement and determination of the number of microorganisms. Déminéralisation efficiency was evaluated based on the ratio of SiO2, Al2O3 and Fe2O3 contents in the substrates before and after the experiments. Surprisingly, in all experiments much better desilicification was observed in control tests compared to inoculated substrates. Discovery of a zymogenic culture in all three oil shale samples explained the apparent anomaly. Based on physiological, biochemical and taxonomic characteristics, the isolated zymogenic culture was identified as Bacillus sp.
T2  - Journal of Environmental Protection and Ecology
T1  - Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale
VL  - 12
IS  - 1
SP  - 151
EP  - 156
UR  - https://hdl.handle.net/21.15107/rcub_cer_937
ER  - 

@article{
author = "Dragutinović, Vesna and Cvetković, Olga and Vitorović, Dragomir",
year = "2011",
abstract = "The déminéralisation experiments are aimed at preparing native sedimentary organic matter concentrates, consisting mainly of insoluble kerogen. Initial desilicification experiments of three Aleksinac (Serbia) oil shale samples were carried out with the help of Bacillus circulons J ordan. The process was followed by pH measurement and determination of the number of microorganisms. Déminéralisation efficiency was evaluated based on the ratio of SiO2, Al2O3 and Fe2O3 contents in the substrates before and after the experiments. Surprisingly, in all experiments much better desilicification was observed in control tests compared to inoculated substrates. Discovery of a zymogenic culture in all three oil shale samples explained the apparent anomaly. Based on physiological, biochemical and taxonomic characteristics, the isolated zymogenic culture was identified as Bacillus sp.",
journal = "Journal of Environmental Protection and Ecology",
title = "Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale",
volume = "12",
number = "1",
pages = "151-156",
url = "https://hdl.handle.net/21.15107/rcub_cer_937"
}

Dragutinović, V., Cvetković, O.,& Vitorović, D.. (2011). Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale. in Journal of Environmental Protection and Ecology, 12(1), 151-156.
https://hdl.handle.net/21.15107/rcub_cer_937

Dragutinović V, Cvetković O, Vitorović D. Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale. in Journal of Environmental Protection and Ecology. 2011;12(1):151-156.
https://hdl.handle.net/21.15107/rcub_cer_937 .

Dragutinović, Vesna, Cvetković, Olga, Vitorović, Dragomir, "Zymogenic Bacillus sp. revealed in Aleksinac (Serbia) oil shale" in Journal of Environmental Protection and Ecology, 12, no. 1 (2011):151-156,
https://hdl.handle.net/21.15107/rcub_cer_937 .

TY  - JOUR
AU  - Stojanović, Ksenija
AU  - Jovančićević, Branimir
AU  - Šajnović, Aleksandra
AU  - Sabo, Tibor
AU  - Vitorović, Dragomir
AU  - Schwarzbauer, Jan
AU  - Golovko, Anatoly
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/554
AB  - This paper is aimed at investigating the origin and geological history of the biodegraded Gaj (Serbia) crude oil, based on comparison of biomarkers, particularly alkylaromatics, in crude oil maltene fraction, with those in the liquid raw asphaltene pyrolysis products. The content of asphaltenes in crude oils being generally very low, expecting a higher yield of pyrolysate, pyrolysis of raw asphaltenes was also carried out in the presence of Pt(IV)- and Ru(III)-ions. The used metal ions demonstrated positive effects on the yields of total liquid pyrolysate and corresponding hydrocarbons. Occluded maltene and asphaltene pyrolysis products showed that metal ions had considerably stronger effect on maturation changes in naphthalene and phenanthrene rings than in polycyclic alkanes. The values of maturity parameters observed in maltenes and pyrolysates suggested this crude oil to have been expelled from the source before the "oil window" maximum. The investigated sample of the Gaj crude oil was shown to be in the 4th stage of bio-degradation scale and to have originated from source rocks poor in clays, most probably carbonates, with significant contribution of algae to oil precursor biomass, deposited under a stratified saline water column.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)
VL  - 88
IS  - 2
SP  - 287
EP  - 296
DO  - 10.1016/j.fuel.2008.09.014
ER  - 

@article{
author = "Stojanović, Ksenija and Jovančićević, Branimir and Šajnović, Aleksandra and Sabo, Tibor and Vitorović, Dragomir and Schwarzbauer, Jan and Golovko, Anatoly",
year = "2009",
abstract = "This paper is aimed at investigating the origin and geological history of the biodegraded Gaj (Serbia) crude oil, based on comparison of biomarkers, particularly alkylaromatics, in crude oil maltene fraction, with those in the liquid raw asphaltene pyrolysis products. The content of asphaltenes in crude oils being generally very low, expecting a higher yield of pyrolysate, pyrolysis of raw asphaltenes was also carried out in the presence of Pt(IV)- and Ru(III)-ions. The used metal ions demonstrated positive effects on the yields of total liquid pyrolysate and corresponding hydrocarbons. Occluded maltene and asphaltene pyrolysis products showed that metal ions had considerably stronger effect on maturation changes in naphthalene and phenanthrene rings than in polycyclic alkanes. The values of maturity parameters observed in maltenes and pyrolysates suggested this crude oil to have been expelled from the source before the "oil window" maximum. The investigated sample of the Gaj crude oil was shown to be in the 4th stage of bio-degradation scale and to have originated from source rocks poor in clays, most probably carbonates, with significant contribution of algae to oil precursor biomass, deposited under a stratified saline water column.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)",
volume = "88",
number = "2",
pages = "287-296",
doi = "10.1016/j.fuel.2008.09.014"
}

Stojanović, K., Jovančićević, B., Šajnović, A., Sabo, T., Vitorović, D., Schwarzbauer, J.,& Golovko, A.. (2009). Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia). in Fuel
Elsevier Sci Ltd, Oxford., 88(2), 287-296.
https://doi.org/10.1016/j.fuel.2008.09.014

Stojanović K, Jovančićević B, Šajnović A, Sabo T, Vitorović D, Schwarzbauer J, Golovko A. Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia). in Fuel. 2009;88(2):287-296.
doi:10.1016/j.fuel.2008.09.014 .

Stojanović, Ksenija, Jovančićević, Branimir, Šajnović, Aleksandra, Sabo, Tibor, Vitorović, Dragomir, Schwarzbauer, Jan, Golovko, Anatoly, "Pyrolysis and Pt(IV)- and Ru(III)-ion catalyzed pyrolysis of asphaltenes in organic geochemical investigation of a biodegraded crude oil (Gaj, Serbia)" in Fuel, 88, no. 2 (2009):287-296,
https://doi.org/10.1016/j.fuel.2008.09.014 . .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Beškoski, Vladimir
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5135
AB  - It is estimated that reserves of oil shale in Serbia amounts to about 3 billion tons while the largest deposit (approx. 2/3 of total amount) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia. This deposit is not exploited at the moment. Shale from
Aleksinac is an immature Oligocene-Miocene lacustrine sediment.
C3  - International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009
T1  - Review of our beneficiation of oil shale by bioprocessing on laboratory scale
SP  - 103
UR  - https://hdl.handle.net/21.15107/rcub_cer_5135
ER  - 

@conference{
author = "Vrvić, Miroslav and Beškoski, Vladimir and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir",
year = "2009",
abstract = "It is estimated that reserves of oil shale in Serbia amounts to about 3 billion tons while the largest deposit (approx. 2/3 of total amount) for open-pit and underground exploitation is situated in the locality of Aleksinac in East Serbia. This deposit is not exploited at the moment. Shale from
Aleksinac is an immature Oligocene-Miocene lacustrine sediment.",
journal = "International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009",
title = "Review of our beneficiation of oil shale by bioprocessing on laboratory scale",
pages = "103",
url = "https://hdl.handle.net/21.15107/rcub_cer_5135"
}

Vrvić, M., Beškoski, V., Cvetković, O., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2009). Review of our beneficiation of oil shale by bioprocessing on laboratory scale. in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009, 103.
https://hdl.handle.net/21.15107/rcub_cer_5135

Vrvić M, Beškoski V, Cvetković O, Dragutinović V, Spasić S, Vitorović D. Review of our beneficiation of oil shale by bioprocessing on laboratory scale. in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009. 2009;:103.
https://hdl.handle.net/21.15107/rcub_cer_5135 .

Vrvić, Miroslav, Beškoski, Vladimir, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, "Review of our beneficiation of oil shale by bioprocessing on laboratory scale" in International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009 (2009):103,
https://hdl.handle.net/21.15107/rcub_cer_5135 .

TY  - CONF
AU  - Vrvić, Miroslav
AU  - Beškoski, Vladimir
AU  - Cvetković, Olga
AU  - Dragutinović, Vesna
AU  - Spasić, Snežana
AU  - Vitorović, Dragomir
PY  - 2009
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5136
AB  - Poster presented at International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009
T1  - Review of our beneficiation of oil shale by bioprocessing on laboratory scale
UR  - https://hdl.handle.net/21.15107/rcub_cer_5136
ER  - 

@conference{
author = "Vrvić, Miroslav and Beškoski, Vladimir and Cvetković, Olga and Dragutinović, Vesna and Spasić, Snežana and Vitorović, Dragomir",
year = "2009",
abstract = "Poster presented at International Oil Shale Symposium, Tallin, Estonia, 8-11 June 2009",
title = "Review of our beneficiation of oil shale by bioprocessing on laboratory scale",
url = "https://hdl.handle.net/21.15107/rcub_cer_5136"
}

Vrvić, M., Beškoski, V., Cvetković, O., Dragutinović, V., Spasić, S.,& Vitorović, D.. (2009). Review of our beneficiation of oil shale by bioprocessing on laboratory scale. .
https://hdl.handle.net/21.15107/rcub_cer_5136

Vrvić M, Beškoski V, Cvetković O, Dragutinović V, Spasić S, Vitorović D. Review of our beneficiation of oil shale by bioprocessing on laboratory scale. 2009;.
https://hdl.handle.net/21.15107/rcub_cer_5136 .

Vrvić, Miroslav, Beškoski, Vladimir, Cvetković, Olga, Dragutinović, Vesna, Spasić, Snežana, Vitorović, Dragomir, "Review of our beneficiation of oil shale by bioprocessing on laboratory scale" (2009),
https://hdl.handle.net/21.15107/rcub_cer_5136 .

TY  - JOUR
AU  - Bajc, S.
AU  - Cvetković, Olga
AU  - Ambles, A.
AU  - Vitorović, Dragomir
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/407
AB  - A 29-step alkaline permanganate degradation of type III kerogen from Tyrolean (Hahntennjoch, Austria) oil shale was performed. A high yield of oxidation products was obtained (93.7 % relative to the original kerogen): 0.5 % neutrals and bases, 19.5 % ether-soluble acids and 58.9 % of precipitated (PA). A substantial amount of kerogen carbon (14.8 %) was oxidized into carbon dioxide. The organic residue remaining after the final oxidation step was 6.9 %. The PA components were further oxidized and the total yields relative to original PA were 1.0 % neutrals and bases and 59.0 % ether-soluble acids, the non-degraded residue being 29.3 %. Detailed quantitative and qualitative analysis of all oxidation products suggested the Tyrolean shale kerogen to be a heterogeneous macromolecular substance consisting of three types of structures differing in composition and susceptibility towards alkaline permanganate: the first, resistant, presumably composed of aromatic structures linked by resorcinol ethereal bonds; the second, combined in nature, the aliphatic part comprising methyl-substituents and short cross-links, both easily oxidized into CO2, water and low molecular weight acids and aromatic structures yielding aromatic diand tri-carboxylic acids as oxidation products; finally the third, composed of aliphatic cross-links and substituents, alicyclic (and/or heterocyclic) and some aromatic structures, bound into units moderately resistant towards oxidation. The overall yields of kerogen and PA oxidation products lead towards a balance between aromatic, alkane monoand dicarboxylic and alkanepolycarboxylic acids, suggesting a shift of the structure of Tyrolean shale kerogen from typical aromatic reference type III towards a heterogeneous aromatic-aliphaticalicyclic type structure.
AB  - Stupnjevitom degradacijom kerogena tirolskog škriljca pomoću alkalnog permanganata dobijeni su visoki prinosi oksidacionih proizvoda. Dobijene nerastvorne kiseline naknadno su degradovane u 8 stupnjeva. Detaljna GC-MS analiza kiselina rastvornih u etru, dobijenih degradacijom kerogena, potom intermedijarnih nerastvornih kiselina, pokazala je da je kerogen tirolskog škriljca heterogena makromolekularna supstanca i da se sastoji iz tri tipa strukture, različitog sastava i različite osetljivosti na primenjeno oksidaciono sredstvo. Prvi tip je aromatične prirode sa rezorcinolnim etarskim umreženjem, otporan prema alkalnom permanganatu. Drugi se vrlo lako oksiduje, a sastoji se od aromatičnih struktura umreženih kratkim alifatičnim nizovima i sa većim udelom metil-supstituenata. Ovaj tip strukture je pri oksidaciji dao visok prinos SO2, alifatične kiseline malih molekulskih masa i aromatične dii trikarboksilne kiseline u visokom prinosu. Treći tip strukture je srednje osetljivosti na permanganat, a sastoji se od alicikličnih i/ili heterocikličnih i aromatičnih jezgara povezanih alifatičnim nizovima srednjih dužina. Kvantitativan odnos alifatičnih, aromatičnih i alkan-polikarboksilnih kiselina u oksidacionim proizvodima pokazao je da struktura kerogena tirolskog škriljca odstupa od tipskih, dominantno aromatičnih struktura tipa III, kojima pripada po svom H/C-O/C atomskom odnosu, i da je pomerena ka heterogenim, aromatično-alifatično-alicikličnim strukturama tipa II.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Characterization of type III kerogen from Tyrolean shale (Hahntennjoch, Austria) based on its oxidation products
T1  - Karakterizacija kerogena tipa III Tirolskog škriljca (Hahntennjoch, Austrija) zasnovana na njegovim oksidacionim proizvodima
VL  - 73
IS  - 4
SP  - 463
EP  - 478
DO  - 10.2298/JSC0804463B
ER  - 

@article{
author = "Bajc, S. and Cvetković, Olga and Ambles, A. and Vitorović, Dragomir",
year = "2008",
abstract = "A 29-step alkaline permanganate degradation of type III kerogen from Tyrolean (Hahntennjoch, Austria) oil shale was performed. A high yield of oxidation products was obtained (93.7 % relative to the original kerogen): 0.5 % neutrals and bases, 19.5 % ether-soluble acids and 58.9 % of precipitated (PA). A substantial amount of kerogen carbon (14.8 %) was oxidized into carbon dioxide. The organic residue remaining after the final oxidation step was 6.9 %. The PA components were further oxidized and the total yields relative to original PA were 1.0 % neutrals and bases and 59.0 % ether-soluble acids, the non-degraded residue being 29.3 %. Detailed quantitative and qualitative analysis of all oxidation products suggested the Tyrolean shale kerogen to be a heterogeneous macromolecular substance consisting of three types of structures differing in composition and susceptibility towards alkaline permanganate: the first, resistant, presumably composed of aromatic structures linked by resorcinol ethereal bonds; the second, combined in nature, the aliphatic part comprising methyl-substituents and short cross-links, both easily oxidized into CO2, water and low molecular weight acids and aromatic structures yielding aromatic diand tri-carboxylic acids as oxidation products; finally the third, composed of aliphatic cross-links and substituents, alicyclic (and/or heterocyclic) and some aromatic structures, bound into units moderately resistant towards oxidation. The overall yields of kerogen and PA oxidation products lead towards a balance between aromatic, alkane monoand dicarboxylic and alkanepolycarboxylic acids, suggesting a shift of the structure of Tyrolean shale kerogen from typical aromatic reference type III towards a heterogeneous aromatic-aliphaticalicyclic type structure., Stupnjevitom degradacijom kerogena tirolskog škriljca pomoću alkalnog permanganata dobijeni su visoki prinosi oksidacionih proizvoda. Dobijene nerastvorne kiseline naknadno su degradovane u 8 stupnjeva. Detaljna GC-MS analiza kiselina rastvornih u etru, dobijenih degradacijom kerogena, potom intermedijarnih nerastvornih kiselina, pokazala je da je kerogen tirolskog škriljca heterogena makromolekularna supstanca i da se sastoji iz tri tipa strukture, različitog sastava i različite osetljivosti na primenjeno oksidaciono sredstvo. Prvi tip je aromatične prirode sa rezorcinolnim etarskim umreženjem, otporan prema alkalnom permanganatu. Drugi se vrlo lako oksiduje, a sastoji se od aromatičnih struktura umreženih kratkim alifatičnim nizovima i sa većim udelom metil-supstituenata. Ovaj tip strukture je pri oksidaciji dao visok prinos SO2, alifatične kiseline malih molekulskih masa i aromatične dii trikarboksilne kiseline u visokom prinosu. Treći tip strukture je srednje osetljivosti na permanganat, a sastoji se od alicikličnih i/ili heterocikličnih i aromatičnih jezgara povezanih alifatičnim nizovima srednjih dužina. Kvantitativan odnos alifatičnih, aromatičnih i alkan-polikarboksilnih kiselina u oksidacionim proizvodima pokazao je da struktura kerogena tirolskog škriljca odstupa od tipskih, dominantno aromatičnih struktura tipa III, kojima pripada po svom H/C-O/C atomskom odnosu, i da je pomerena ka heterogenim, aromatično-alifatično-alicikličnim strukturama tipa II.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Characterization of type III kerogen from Tyrolean shale (Hahntennjoch, Austria) based on its oxidation products, Karakterizacija kerogena tipa III Tirolskog škriljca (Hahntennjoch, Austrija) zasnovana na njegovim oksidacionim proizvodima",
volume = "73",
number = "4",
pages = "463-478",
doi = "10.2298/JSC0804463B"
}

Bajc, S., Cvetković, O., Ambles, A.,& Vitorović, D.. (2008). Characterization of type III kerogen from Tyrolean shale (Hahntennjoch, Austria) based on its oxidation products. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 73(4), 463-478.
https://doi.org/10.2298/JSC0804463B

Bajc S, Cvetković O, Ambles A, Vitorović D. Characterization of type III kerogen from Tyrolean shale (Hahntennjoch, Austria) based on its oxidation products. in Journal of the Serbian Chemical Society. 2008;73(4):463-478.
doi:10.2298/JSC0804463B .

Bajc, S., Cvetković, Olga, Ambles, A., Vitorović, Dragomir, "Characterization of type III kerogen from Tyrolean shale (Hahntennjoch, Austria) based on its oxidation products" in Journal of the Serbian Chemical Society, 73, no. 4 (2008):463-478,
https://doi.org/10.2298/JSC0804463B . .

TY  - JOUR
AU  - Šolević Knudsen, Tatjana
AU  - Stojanović, Ksenija
AU  - Bojesen-Koefoed, J.
AU  - Nytoft, Hans Peter
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir
PY  - 2008
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/400
AB  - Twenty five crude oil samples from Velebit oil-gas field (SE Pannonian Basin, Serbia) were investigated in order to define the depositional environment, lithology, thermal maturity and depth of burial of the corresponding source rocks. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were determined using gas chromatography (GC) and gas chromatography-mass spectrometry-mass spectrometry (GC MS-MS). Source and maturity parameters were calculated from the distribution and abundance of biomarker compounds and principal component analysis (PCA) was used to interpret their relationships. The Velebit crude oils were generated from siliciclastic source rocks containing a mixture of terrestrial and marine organic matter that was deposited under a predominantly reducing environment, probably in the distal marine portion of a delta. Maturation parameters indicated significant thermal maturity corresponding to peak oil generation. Age-diagnostic biomarker ratios suggest that the source of Velebit oils may be Upper Cretaceous, older than most oils in the Pannonian Basin, which are generated from Tertiary sources. These source rocks are thought to be at a present-day depth of approximately 3000 m, within or in close proximity to, the oil field.
PB  - Oxford : Pergamon-Elsevier Science Ltd
T2  - Organic Geochemistry
T1  - Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions
VL  - 39
IS  - 1
SP  - 118
EP  - 134
DO  - 10.1016/j.orggeochem.2007.09.003
ER  - 

@article{
author = "Šolević Knudsen, Tatjana and Stojanović, Ksenija and Bojesen-Koefoed, J. and Nytoft, Hans Peter and Jovančićević, Branimir and Vitorović, Dragomir",
year = "2008",
abstract = "Twenty five crude oil samples from Velebit oil-gas field (SE Pannonian Basin, Serbia) were investigated in order to define the depositional environment, lithology, thermal maturity and depth of burial of the corresponding source rocks. Saturated biomarkers (n-alkanes, isoprenoids, steranes and triterpanes) were determined using gas chromatography (GC) and gas chromatography-mass spectrometry-mass spectrometry (GC MS-MS). Source and maturity parameters were calculated from the distribution and abundance of biomarker compounds and principal component analysis (PCA) was used to interpret their relationships. The Velebit crude oils were generated from siliciclastic source rocks containing a mixture of terrestrial and marine organic matter that was deposited under a predominantly reducing environment, probably in the distal marine portion of a delta. Maturation parameters indicated significant thermal maturity corresponding to peak oil generation. Age-diagnostic biomarker ratios suggest that the source of Velebit oils may be Upper Cretaceous, older than most oils in the Pannonian Basin, which are generated from Tertiary sources. These source rocks are thought to be at a present-day depth of approximately 3000 m, within or in close proximity to, the oil field.",
publisher = "Oxford : Pergamon-Elsevier Science Ltd",
journal = "Organic Geochemistry",
title = "Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions",
volume = "39",
number = "1",
pages = "118-134",
doi = "10.1016/j.orggeochem.2007.09.003"
}

Šolević Knudsen, T., Stojanović, K., Bojesen-Koefoed, J., Nytoft, H. P., Jovančićević, B.,& Vitorović, D.. (2008). Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions. in Organic Geochemistry
Oxford : Pergamon-Elsevier Science Ltd., 39(1), 118-134.
https://doi.org/10.1016/j.orggeochem.2007.09.003

Šolević Knudsen T, Stojanović K, Bojesen-Koefoed J, Nytoft HP, Jovančićević B, Vitorović D. Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions. in Organic Geochemistry. 2008;39(1):118-134.
doi:10.1016/j.orggeochem.2007.09.003 .

Šolević Knudsen, Tatjana, Stojanović, Ksenija, Bojesen-Koefoed, J., Nytoft, Hans Peter, Jovančićević, Branimir, Vitorović, Dragomir, "Origin of oils in the Velebit oil-gas field, SE Pannonian Basin, Serbia - Source rocks characterization based on biological marker distributions" in Organic Geochemistry, 39, no. 1 (2008):118-134,
https://doi.org/10.1016/j.orggeochem.2007.09.003 . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vrvić, Miroslav
AU  - Schwarzbauer, Jan
AU  - Wehner, Hermann
AU  - Scheeder, Georg
AU  - Vitorović, Dragomir K.
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4326
AB  - A review is given in this paper of the up-to-date results observed in differentiation and transformation studies on petroleum-type pollutants in underground and surface waters. Water and particulate matter derived from the locality of Pancevo Petroleum Refinery, Serbia (River Danube alluvial formations). It was shown that distributions of n-alkanes, steranes and triterpanes, and delta C-13(PDB) values of n-alkanes may successfully be used for qualitatively differentiating the petroleum-type pollutants from native organic matter in recent sedimentary formations. In underground waters, a petroleum-type pollutant is exposed to microbiological degradation which is manifested through relatively fast degradation of n-alkanes. Following an almost complete degradation of crude oil n-alkanes in underground water, the biosynthesis of novel, even carbon-number C-16-C-30 n-alkanes may be observed. It is shown that the n-alkane distribution observed in a petroleum-type pollutant may depend on the intensity of its previous interaction with water. The fate of petroleum-type pollutants in environmental waters may be predicted through laboratory simulative microbiological degradation experiments by using microorganism consortiums similar to those observed under relevant natural conditions, as well as on corresponding nutrient base.
PB  - Springer
T2  - Water Air and Soil Pollution
T1  - Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)
VL  - 183
IS  - 1-4
SP  - 225
EP  - 238
DO  - 10.1007/s11270-007-9371-7
ER  - 

@article{
author = "Jovančićević, Branimir and Vrvić, Miroslav and Schwarzbauer, Jan and Wehner, Hermann and Scheeder, Georg and Vitorović, Dragomir K.",
year = "2007",
abstract = "A review is given in this paper of the up-to-date results observed in differentiation and transformation studies on petroleum-type pollutants in underground and surface waters. Water and particulate matter derived from the locality of Pancevo Petroleum Refinery, Serbia (River Danube alluvial formations). It was shown that distributions of n-alkanes, steranes and triterpanes, and delta C-13(PDB) values of n-alkanes may successfully be used for qualitatively differentiating the petroleum-type pollutants from native organic matter in recent sedimentary formations. In underground waters, a petroleum-type pollutant is exposed to microbiological degradation which is manifested through relatively fast degradation of n-alkanes. Following an almost complete degradation of crude oil n-alkanes in underground water, the biosynthesis of novel, even carbon-number C-16-C-30 n-alkanes may be observed. It is shown that the n-alkane distribution observed in a petroleum-type pollutant may depend on the intensity of its previous interaction with water. The fate of petroleum-type pollutants in environmental waters may be predicted through laboratory simulative microbiological degradation experiments by using microorganism consortiums similar to those observed under relevant natural conditions, as well as on corresponding nutrient base.",
publisher = "Springer",
journal = "Water Air and Soil Pollution",
title = "Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)",
volume = "183",
number = "1-4",
pages = "225-238",
doi = "10.1007/s11270-007-9371-7"
}

Jovančićević, B., Vrvić, M., Schwarzbauer, J., Wehner, H., Scheeder, G.,& Vitorović, D. K.. (2007). Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia). in Water Air and Soil Pollution
Springer., 183(1-4), 225-238.
https://doi.org/10.1007/s11270-007-9371-7

Jovančićević B, Vrvić M, Schwarzbauer J, Wehner H, Scheeder G, Vitorović DK. Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia). in Water Air and Soil Pollution. 2007;183(1-4):225-238.
doi:10.1007/s11270-007-9371-7 .

Jovančićević, Branimir, Vrvić, Miroslav, Schwarzbauer, Jan, Wehner, Hermann, Scheeder, Georg, Vitorović, Dragomir K., "Organic-geochemical differentiation of petroleum-type pollutants and study of their fate in Danube alluvial sediments and corresponding water (Pancevo Oil Refinery, Serbia)" in Water Air and Soil Pollution, 183, no. 1-4 (2007):225-238,
https://doi.org/10.1007/s11270-007-9371-7 . .

TY  - JOUR
AU  - Stojanović, Ksenija
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Golovko, Yulia
AU  - Pevneva, Galina S.
AU  - Golovko, Anatoly Kuzmich
PY  - 2007
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4300
AB  - Twenty three crude oils from the Serbian part of the Pannonian Basin (14 from the Vojvodina Province and 9 from the Drmno Depression) were investigated, aimed at an evaluation of oil-oil maturity correlation parameters based on the distribution and abundance of saturated biomarkers and alkylarene constituents. Factor and cluster analyses were used for this purpose. Factor analyses using varimax rotation were first run separately, i.e., of maturity parameters based on the abundance of (a) n-alkanes and isoprenoids, (b) steranes and triterpanes, (c) alkylnaphthalenes, and (d) alkylphenanthrenes. These analyses yielded 9 important "maturity factors". Eight of them, showing higher than 30 % of variance, were further involved in another factor analysis, as well as in cluster analysis using the Ward method. In this way, all maturity parameters based on saturated biomarkers and alkylarenes were evaluated and ranged, considering the fact that the observed factors represented their linear combinations. The results showed that in the correlation of crude oils from the Serbian part of the Pannonian Basin, the most important were maturity parameters based on isomerization reactions involving one methyl group in thermodynamically less stable α-methylnaphthalenes, ethylnaphthalenes, dimethylnaphthalenes and methylphenanthrenes, and their change into more stable isomers with the methyl group in the β-position in the aromatic ring. Processes constituting high loadings factor 2 and factor 3 parameters were also defined. Hierarchy between the "factors" and parameters were controlled, and approved, by cluster analysis using the Ward method. Finally, the investigated crude oils were correlated by factor and cluster analyses, using all the important "maturity factors". Differences in maturity were observed between the Vojvodina and Drmno Depression crude oils, as well as between oils originating from South Banat, North Banat and the Velebit oil field (Vojvodina locality).
AB  - У овом раду је, применом новог приступа у факторској и кластерској анализи, евалуиран значај матурационих параметара заснованих на расподели и обилности засићених биомаркера и алкиларена у корелацији нафта–нафта на примеру 23 узорка сировe нафтe из дела Панонског басена у Србији (14 са локалитета у Војводини и 9 из депресије Дрмно). Факторске анализе су, уз примену varimax ротације, најпре извођене посебно са матура- ционим параметрима израчунатим из расподеле и обилности (а) n-алкана и изопреноидних алифатичних алкана, (б) стерана и тритерпана, (в) алкилнафталена и (г) алкилфенантрена. Ове анализе резултирале су са 9 значајних “матурационих фактора”. Осам од њих, који су показивали проценат варијације већи од 30 %, укључени су у нову факторску и кластерску анализу, уз примену Ward методе. На тај начин су сви матурациони параметри засновани на расподели и обилности засићених биомаркера и алкиларена били процењени и рангирани, имајући у виду чињеницу да фактори предстваљају њихове линеарне комбинације. Резултати су показали да су за корелацију нафти из дела Панонског басена у Србији најзначајанији матурациони параметри засновани на изомеризацији једне алкил-групе из α- у термодина- мички стабилније β-положаје на ароматичном прстену метилнафталена, етилнафталена, ди- метилнафталена, триметилнафталена и метилфенантрена. Такође, одређени су параметри/ти- пови матурационих реакција који су у великој мери дефинисали факторе 2 и 3. Редослед и сагласност између фактора, односно параметара, проверена је и потврђена кластерском ана- лизом уз примену Ward методе. Коначно, испитивани узорци сирове нафте су корелисани помоћу факторске и кластерске анализе, користећи све значајне “матурационе факторе”. Раз- лике у степену термичке зрелости уочене су како између узорака из Војводине и депресије Дрмно, тако и између узорака из Војводине који потичу из лежишта јужног Баната, северног Баната и нафтног поља Велебит.
PB  - Belgrade : Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia)
T1  - Евалуација матурационих параметара заснованих на засићеним и  ароматичним угљоводоницима у корелацији нафта-нафта (југоисточни део панонског басена , Србија)
VL  - 72
IS  - 12
SP  - 1237
EP  - 1254
DO  - 10.2298/JSC0712237S
ER  - 

@article{
author = "Stojanović, Ksenija and Jovančićević, Branimir and Vitorović, Dragomir K. and Golovko, Yulia and Pevneva, Galina S. and Golovko, Anatoly Kuzmich",
year = "2007",
abstract = "Twenty three crude oils from the Serbian part of the Pannonian Basin (14 from the Vojvodina Province and 9 from the Drmno Depression) were investigated, aimed at an evaluation of oil-oil maturity correlation parameters based on the distribution and abundance of saturated biomarkers and alkylarene constituents. Factor and cluster analyses were used for this purpose. Factor analyses using varimax rotation were first run separately, i.e., of maturity parameters based on the abundance of (a) n-alkanes and isoprenoids, (b) steranes and triterpanes, (c) alkylnaphthalenes, and (d) alkylphenanthrenes. These analyses yielded 9 important "maturity factors". Eight of them, showing higher than 30 % of variance, were further involved in another factor analysis, as well as in cluster analysis using the Ward method. In this way, all maturity parameters based on saturated biomarkers and alkylarenes were evaluated and ranged, considering the fact that the observed factors represented their linear combinations. The results showed that in the correlation of crude oils from the Serbian part of the Pannonian Basin, the most important were maturity parameters based on isomerization reactions involving one methyl group in thermodynamically less stable α-methylnaphthalenes, ethylnaphthalenes, dimethylnaphthalenes and methylphenanthrenes, and their change into more stable isomers with the methyl group in the β-position in the aromatic ring. Processes constituting high loadings factor 2 and factor 3 parameters were also defined. Hierarchy between the "factors" and parameters were controlled, and approved, by cluster analysis using the Ward method. Finally, the investigated crude oils were correlated by factor and cluster analyses, using all the important "maturity factors". Differences in maturity were observed between the Vojvodina and Drmno Depression crude oils, as well as between oils originating from South Banat, North Banat and the Velebit oil field (Vojvodina locality)., У овом раду је, применом новог приступа у факторској и кластерској анализи, евалуиран значај матурационих параметара заснованих на расподели и обилности засићених биомаркера и алкиларена у корелацији нафта–нафта на примеру 23 узорка сировe нафтe из дела Панонског басена у Србији (14 са локалитета у Војводини и 9 из депресије Дрмно). Факторске анализе су, уз примену varimax ротације, најпре извођене посебно са матура- ционим параметрима израчунатим из расподеле и обилности (а) n-алкана и изопреноидних алифатичних алкана, (б) стерана и тритерпана, (в) алкилнафталена и (г) алкилфенантрена. Ове анализе резултирале су са 9 значајних “матурационих фактора”. Осам од њих, који су показивали проценат варијације већи од 30 %, укључени су у нову факторску и кластерску анализу, уз примену Ward методе. На тај начин су сви матурациони параметри засновани на расподели и обилности засићених биомаркера и алкиларена били процењени и рангирани, имајући у виду чињеницу да фактори предстваљају њихове линеарне комбинације. Резултати су показали да су за корелацију нафти из дела Панонског басена у Србији најзначајанији матурациони параметри засновани на изомеризацији једне алкил-групе из α- у термодина- мички стабилније β-положаје на ароматичном прстену метилнафталена, етилнафталена, ди- метилнафталена, триметилнафталена и метилфенантрена. Такође, одређени су параметри/ти- пови матурационих реакција који су у великој мери дефинисали факторе 2 и 3. Редослед и сагласност између фактора, односно параметара, проверена је и потврђена кластерском ана- лизом уз примену Ward методе. Коначно, испитивани узорци сирове нафте су корелисани помоћу факторске и кластерске анализе, користећи све значајне “матурационе факторе”. Раз- лике у степену термичке зрелости уочене су како између узорака из Војводине и депресије Дрмно, тако и између узорака из Војводине који потичу из лежишта јужног Баната, северног Баната и нафтног поља Велебит.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia), Евалуација матурационих параметара заснованих на засићеним и  ароматичним угљоводоницима у корелацији нафта-нафта (југоисточни део панонског басена , Србија)",
volume = "72",
number = "12",
pages = "1237-1254",
doi = "10.2298/JSC0712237S"
}

Stojanović, K., Jovančićević, B., Vitorović, D. K., Golovko, Y., Pevneva, G. S.,& Golovko, A. K.. (2007). Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society
Belgrade : Serbian Chemical Society., 72(12), 1237-1254.
https://doi.org/10.2298/JSC0712237S

Stojanović K, Jovančićević B, Vitorović DK, Golovko Y, Pevneva GS, Golovko AK. Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia). in Journal of the Serbian Chemical Society. 2007;72(12):1237-1254.
doi:10.2298/JSC0712237S .

Stojanović, Ksenija, Jovančićević, Branimir, Vitorović, Dragomir K., Golovko, Yulia, Pevneva, Galina S., Golovko, Anatoly Kuzmich, "Evaluation of saturated and aromatic hydrocarbons oil-oil maturity correlation parameters (SE Pannonian Basin, Serbia)" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1237-1254,
https://doi.org/10.2298/JSC0712237S . .

TY  - JOUR
AU  - Cvetković, Olga
AU  - Vrvić, Miroslav
AU  - Dragutinović, Vesna
AU  - Vitorović, Dragomir
PY  - 2006
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/230
AB  - Investigation on combined bacterial demineralization of sediments i.e. removal of silicates (desilicification) by Bacillus circulans and removal of pyrite (depyritization) by Acidithiobacillus ferrooxidans are reviewed in this paper. These methods represent a new approach in solving one of important organic geochemical problems, isolation of native organic matter (kerogen) concentrate from sediments. Using the oil shale from Aleksinac as substrate, the most important aspect of bacterial demineralization was examined: the question of whether or to what extent do the applied bacteria affect the composition and structure of kerogen. High efficiency of Acidithiobacillus ferrooxidans was observed in depyritization experiments (ca 91%). On the other hand, in 30-day-leaching period noticeable elimination of silicates by Bacillus circulans (ca 40%) was achieved. For detailed analyses prior to and after bacterial demineralization, besides standard methods (such as i.r. spectroscopy, elemental microanalysis, micropetrographic analysis), modern analytical instrumental methods were also used (e.g., P-GC and P-GC-MS). The observed results suggested that during these processes the sedimentary organic matter remained native. Thus, the advantage of bacterial vs. chemical demineralization process was demonstrated.
AB  - U ovom radu su prikazani rezultati proučavanja bakterijske demineralizacije, izdvajanja silikata (desilicifikacije) pomoću B.C. i izdvajanja pirita (depiritizacija) pomoću A. ferrooxidan. Predložene metode su novi pristup rešavanju jednog od veoma važnih geohemijskih problema, izolovanja organske supstance (kerogena) iz sedimenata. Upotrebom uljnog škriljca iz Aleksinca, kao model supstrata, proučavana su dva najvažnija aspekta bakterijske demineralizacije: dali i kom stepenu deluje upotrebljena bakterija na sastav i strukturu kerogena. U eksperimentima depiritizacije pomoću A. ferrooxidans postignuta je visoka efikasnost (91%) udaljavanja pirita. Znatna eliminacija silikata (40%) ustanovljena je posle 30-dnevnog perioda luženja silikata pomoću B.C. Jordan. Za detaljnu analizu pre i posle bakterijske demineralizacije. pored standardnih uobičajenih metoda (kao npr. IR spektroskopija. elementarna mikroanaliza, mikropetrografska analiza) primenjene su i druge analitičke metode (kao npr. P-GC P-GC-MS). Dobijeni rezultati su pokazali da organska materija sedimenata ostaje nativna tokom ovih procesa. Ovim rezultatima je pokazana prednost bakterijske u odnosu na hemijsku demineralizaciju.
T2  - Acta biologica iugoslavica - serija B: Mikrobiologija
T1  - Preparation of sedimentary organic matter concentrates by microbiological methods
T1  - Pripremanje koncentrata organske supstance primenom mikrobioloških metoda
VL  - 43
IS  - 1
SP  - 41
EP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_cer_230
ER  - 

@article{
author = "Cvetković, Olga and Vrvić, Miroslav and Dragutinović, Vesna and Vitorović, Dragomir",
year = "2006",
abstract = "Investigation on combined bacterial demineralization of sediments i.e. removal of silicates (desilicification) by Bacillus circulans and removal of pyrite (depyritization) by Acidithiobacillus ferrooxidans are reviewed in this paper. These methods represent a new approach in solving one of important organic geochemical problems, isolation of native organic matter (kerogen) concentrate from sediments. Using the oil shale from Aleksinac as substrate, the most important aspect of bacterial demineralization was examined: the question of whether or to what extent do the applied bacteria affect the composition and structure of kerogen. High efficiency of Acidithiobacillus ferrooxidans was observed in depyritization experiments (ca 91%). On the other hand, in 30-day-leaching period noticeable elimination of silicates by Bacillus circulans (ca 40%) was achieved. For detailed analyses prior to and after bacterial demineralization, besides standard methods (such as i.r. spectroscopy, elemental microanalysis, micropetrographic analysis), modern analytical instrumental methods were also used (e.g., P-GC and P-GC-MS). The observed results suggested that during these processes the sedimentary organic matter remained native. Thus, the advantage of bacterial vs. chemical demineralization process was demonstrated., U ovom radu su prikazani rezultati proučavanja bakterijske demineralizacije, izdvajanja silikata (desilicifikacije) pomoću B.C. i izdvajanja pirita (depiritizacija) pomoću A. ferrooxidan. Predložene metode su novi pristup rešavanju jednog od veoma važnih geohemijskih problema, izolovanja organske supstance (kerogena) iz sedimenata. Upotrebom uljnog škriljca iz Aleksinca, kao model supstrata, proučavana su dva najvažnija aspekta bakterijske demineralizacije: dali i kom stepenu deluje upotrebljena bakterija na sastav i strukturu kerogena. U eksperimentima depiritizacije pomoću A. ferrooxidans postignuta je visoka efikasnost (91%) udaljavanja pirita. Znatna eliminacija silikata (40%) ustanovljena je posle 30-dnevnog perioda luženja silikata pomoću B.C. Jordan. Za detaljnu analizu pre i posle bakterijske demineralizacije. pored standardnih uobičajenih metoda (kao npr. IR spektroskopija. elementarna mikroanaliza, mikropetrografska analiza) primenjene su i druge analitičke metode (kao npr. P-GC P-GC-MS). Dobijeni rezultati su pokazali da organska materija sedimenata ostaje nativna tokom ovih procesa. Ovim rezultatima je pokazana prednost bakterijske u odnosu na hemijsku demineralizaciju.",
journal = "Acta biologica iugoslavica - serija B: Mikrobiologija",
title = "Preparation of sedimentary organic matter concentrates by microbiological methods, Pripremanje koncentrata organske supstance primenom mikrobioloških metoda",
volume = "43",
number = "1",
pages = "41-54",
url = "https://hdl.handle.net/21.15107/rcub_cer_230"
}

Cvetković, O., Vrvić, M., Dragutinović, V.,& Vitorović, D.. (2006). Preparation of sedimentary organic matter concentrates by microbiological methods. in Acta biologica iugoslavica - serija B: Mikrobiologija, 43(1), 41-54.
https://hdl.handle.net/21.15107/rcub_cer_230

Cvetković O, Vrvić M, Dragutinović V, Vitorović D. Preparation of sedimentary organic matter concentrates by microbiological methods. in Acta biologica iugoslavica - serija B: Mikrobiologija. 2006;43(1):41-54.
https://hdl.handle.net/21.15107/rcub_cer_230 .

Cvetković, Olga, Vrvić, Miroslav, Dragutinović, Vesna, Vitorović, Dragomir, "Preparation of sedimentary organic matter concentrates by microbiological methods" in Acta biologica iugoslavica - serija B: Mikrobiologija, 43, no. 1 (2006):41-54,
https://hdl.handle.net/21.15107/rcub_cer_230 .

TY  - JOUR
AU  - Šainović, Aleksandar M.
AU  - Stojanović, Ksenija
AU  - Filipović, Ivan T.
AU  - Cvetković, Olga
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
PY  - 2004
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/135
AB  - The factor analysis, used in this work for the interpretation of maturation parameters observed in an exploration study of a group of surface sediments of diverse age originating from different localities in Serbia, resulted in two significant factors. Factor 1 involved parameters related mainly to maturation changes within the aliphatic chains of the organic matter and factor 2 involved parameters based mainly on changes in the terpane and sterane rings. A statistically significant inversely proportional linear dependence between factors 1 and 2 was observed with older, in contrast to younger sediments, suggesting that the reactions of the aliphatic chains in the older sediments did not occur simultaneously with the reactions in the rings and, also, that the older surface sediments examined in this study may be characterized by a degree of thermal maturity corresponding to changes in the biomarker sterane and terpane rings, while the younger sediments by intensive changes in the aliphatic chains.
AB  - U ovom radu faktorska analiza je primenjena za interpretaciju osam maturacionih parametara izračunatih u okviru eksploracionog istraživanja trinaest uzoraka površinskih sedimenata različite starosti, uzetih sa različitih lokaliteta u Srbiji. Analizom su utvrđena dva značajna faktora. Faktor 1 je obuhvatio parametre zasnovane pretežno na maturacionim promenama alifatičnih nizova, a faktor 2 parametre zasnovane uglavnom na promenama u terpanskim i steranskim prstenovima. Statistički značajna, obrnuto proporcionalna, linearna zavisnost između faktora 1 i 2 utvrđena je kod starijih, za razliku od mlađih sedimenata.Na osnovu toga pretpostavljeno je da se kod starih sedimenata reakcije u alifatičnom nizu i prstenu nisu odigravale istovremeno, i takođe, da se stariji sedimenti ispitivani u ovom radu mogu okarakterisati stepenom termičke zrelosti koji odgovara promenama u biomarkerskim steranskim i terpanskim prstenovima, a mlađi intenzivnim promenama u alifatičnim nizovima.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Interpretation of Serbian surface sediment maturation parameters based on factor analysis
T1  - Primena faktorske analize u interpretaciji maturacionih parametara površinskih sedimenata Srbije
VL  - 69
IS  - 8-9
SP  - 611
EP  - 624
DO  - 10.2298/JSC0409611S
ER  - 

@article{
author = "Šainović, Aleksandar M. and Stojanović, Ksenija and Filipović, Ivan T. and Cvetković, Olga and Jovančićević, Branimir and Vitorović, Dragomir K.",
year = "2004",
abstract = "The factor analysis, used in this work for the interpretation of maturation parameters observed in an exploration study of a group of surface sediments of diverse age originating from different localities in Serbia, resulted in two significant factors. Factor 1 involved parameters related mainly to maturation changes within the aliphatic chains of the organic matter and factor 2 involved parameters based mainly on changes in the terpane and sterane rings. A statistically significant inversely proportional linear dependence between factors 1 and 2 was observed with older, in contrast to younger sediments, suggesting that the reactions of the aliphatic chains in the older sediments did not occur simultaneously with the reactions in the rings and, also, that the older surface sediments examined in this study may be characterized by a degree of thermal maturity corresponding to changes in the biomarker sterane and terpane rings, while the younger sediments by intensive changes in the aliphatic chains., U ovom radu faktorska analiza je primenjena za interpretaciju osam maturacionih parametara izračunatih u okviru eksploracionog istraživanja trinaest uzoraka površinskih sedimenata različite starosti, uzetih sa različitih lokaliteta u Srbiji. Analizom su utvrđena dva značajna faktora. Faktor 1 je obuhvatio parametre zasnovane pretežno na maturacionim promenama alifatičnih nizova, a faktor 2 parametre zasnovane uglavnom na promenama u terpanskim i steranskim prstenovima. Statistički značajna, obrnuto proporcionalna, linearna zavisnost između faktora 1 i 2 utvrđena je kod starijih, za razliku od mlađih sedimenata.Na osnovu toga pretpostavljeno je da se kod starih sedimenata reakcije u alifatičnom nizu i prstenu nisu odigravale istovremeno, i takođe, da se stariji sedimenti ispitivani u ovom radu mogu okarakterisati stepenom termičke zrelosti koji odgovara promenama u biomarkerskim steranskim i terpanskim prstenovima, a mlađi intenzivnim promenama u alifatičnim nizovima.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Interpretation of Serbian surface sediment maturation parameters based on factor analysis, Primena faktorske analize u interpretaciji maturacionih parametara površinskih sedimenata Srbije",
volume = "69",
number = "8-9",
pages = "611-624",
doi = "10.2298/JSC0409611S"
}

Šainović, A. M., Stojanović, K., Filipović, I. T., Cvetković, O., Jovančićević, B.,& Vitorović, D. K.. (2004). Interpretation of Serbian surface sediment maturation parameters based on factor analysis. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 69(8-9), 611-624.
https://doi.org/10.2298/JSC0409611S

Šainović AM, Stojanović K, Filipović IT, Cvetković O, Jovančićević B, Vitorović DK. Interpretation of Serbian surface sediment maturation parameters based on factor analysis. in Journal of the Serbian Chemical Society. 2004;69(8-9):611-624.
doi:10.2298/JSC0409611S .

Šainović, Aleksandar M., Stojanović, Ksenija, Filipović, Ivan T., Cvetković, Olga, Jovančićević, Branimir, Vitorović, Dragomir K., "Interpretation of Serbian surface sediment maturation parameters based on factor analysis" in Journal of the Serbian Chemical Society, 69, no. 8-9 (2004):611-624,
https://doi.org/10.2298/JSC0409611S . .

TY  - JOUR
AU  - Vrvić, Miroslav
AU  - Dragutinović, Vesna
AU  - Matić, Valerija
AU  - Spasić, Snežana
AU  - Cvetković, Olga
AU  - Vitorović, Dragomir K.
PY  - 2003
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/113
AB  - The results of kinetic studies of bacterial depyritization of HCl-kerogen concentrate of Aleksinac (Serbia) oil shale by the chemolithoautotrophic thionic bacteria Thiobacillus ferrooxidans under discontinuous laboratory conditions at various temperatures (0, 20, 28 and 37 ºC) at a pH of ca. 1.5 are presented in this paper. Low pH prevents the occurrence of the precipitation of iron(III)-ion hydrolysis products on the substrate particles and thereby reduces the process efficiency. Bacterial depyritization is developed as per kinetics of the first order. The activation energy which points to a successive mechanism of pyrite biooxidation, was computed from the Arrhenius plot. The biochemical kinetics indicators point to a high affinity of the bacteria toward pyrite but small values of Vmax, which are probably the result of decelerated metabolic processes due to the low pH value of the environment resp. the large difference of thepHbetween the external medium and the cell interior.
AB  - U radu su prikazani rezultati kinetičkih proučavanja bakterijske depiritizacije HCl-kerogenskog koncentrata aleksinačkog (Srbija) bituminoznog škriljca pomoću hemolitoautotrofne tionske bakterije Thiobacillus ferrooxidans u diskontinualnim laboratorijskim uslovima na različitim temperaturama (0, 20, 28 i 37 ºC) pri pH oko 1,5. Nisko pH sprečava nastajanje proizvoda hidrolize gvožđe(III)-jona, koji se talože na česticama supstrata i time smanjuju efikasnost procesa. Bakterijska depiritizacija se odvija po kinetici prvog reda. Iz Arrhenius-ovog dijagrama izračunata je aktivaciona energija koja ukazuje na sukcesivni mehanizam biooksidacije pirita. Pokazatelji biohemijske kinetike ukazuju na visoki afinitet bakterija prema piritu, ali male vrednosti Vmax, što je verovatno posledica usporenih metaboličkih procesa zbog niske pH vrednosti sredine odnosno velike razlike pH između spoljašnje sredine i unutrašnjosti ćelije.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures
T1  - Kinetičko proučavanje depiritizacije HCL-kerogenskog koncentrata bituminoznog škriljca pomoću Thiobacillus ferrooxidans na različitim temperaturama
VL  - 68
IS  - 4-5
SP  - 417
EP  - 423
DO  - 10.2298/JSC0305417V
ER  - 

@article{
author = "Vrvić, Miroslav and Dragutinović, Vesna and Matić, Valerija and Spasić, Snežana and Cvetković, Olga and Vitorović, Dragomir K.",
year = "2003",
abstract = "The results of kinetic studies of bacterial depyritization of HCl-kerogen concentrate of Aleksinac (Serbia) oil shale by the chemolithoautotrophic thionic bacteria Thiobacillus ferrooxidans under discontinuous laboratory conditions at various temperatures (0, 20, 28 and 37 ºC) at a pH of ca. 1.5 are presented in this paper. Low pH prevents the occurrence of the precipitation of iron(III)-ion hydrolysis products on the substrate particles and thereby reduces the process efficiency. Bacterial depyritization is developed as per kinetics of the first order. The activation energy which points to a successive mechanism of pyrite biooxidation, was computed from the Arrhenius plot. The biochemical kinetics indicators point to a high affinity of the bacteria toward pyrite but small values of Vmax, which are probably the result of decelerated metabolic processes due to the low pH value of the environment resp. the large difference of thepHbetween the external medium and the cell interior., U radu su prikazani rezultati kinetičkih proučavanja bakterijske depiritizacije HCl-kerogenskog koncentrata aleksinačkog (Srbija) bituminoznog škriljca pomoću hemolitoautotrofne tionske bakterije Thiobacillus ferrooxidans u diskontinualnim laboratorijskim uslovima na različitim temperaturama (0, 20, 28 i 37 ºC) pri pH oko 1,5. Nisko pH sprečava nastajanje proizvoda hidrolize gvožđe(III)-jona, koji se talože na česticama supstrata i time smanjuju efikasnost procesa. Bakterijska depiritizacija se odvija po kinetici prvog reda. Iz Arrhenius-ovog dijagrama izračunata je aktivaciona energija koja ukazuje na sukcesivni mehanizam biooksidacije pirita. Pokazatelji biohemijske kinetike ukazuju na visoki afinitet bakterija prema piritu, ali male vrednosti Vmax, što je verovatno posledica usporenih metaboličkih procesa zbog niske pH vrednosti sredine odnosno velike razlike pH između spoljašnje sredine i unutrašnjosti ćelije.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures, Kinetičko proučavanje depiritizacije HCL-kerogenskog koncentrata bituminoznog škriljca pomoću Thiobacillus ferrooxidans na različitim temperaturama",
volume = "68",
number = "4-5",
pages = "417-423",
doi = "10.2298/JSC0305417V"
}

Vrvić, M., Dragutinović, V., Matić, V., Spasić, S., Cvetković, O.,& Vitorović, D. K.. (2003). Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 68(4-5), 417-423.
https://doi.org/10.2298/JSC0305417V

Vrvić M, Dragutinović V, Matić V, Spasić S, Cvetković O, Vitorović DK. Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures. in Journal of the Serbian Chemical Society. 2003;68(4-5):417-423.
doi:10.2298/JSC0305417V .

Vrvić, Miroslav, Dragutinović, Vesna, Matić, Valerija, Spasić, Snežana, Cvetković, Olga, Vitorović, Dragomir K., "Akinetic study of the depyritization of oil shale HCl-kerogen concentrate by Thiobacillus ferrooxidans at different temperatures" in Journal of the Serbian Chemical Society, 68, no. 4-5 (2003):417-423,
https://doi.org/10.2298/JSC0305417V . .

TY  - JOUR
AU  - Stojanović, Ksenija
AU  - Jovančićević, Branimir
AU  - Golovko, Anatoly
AU  - Golovko, Julia
AU  - Pevneva, Galina
AU  - Cvetković, Olga
AU  - Vitorović, Dragomir K.
PY  - 2002
UR  - https://ect-journal.kz/index.php/ectj/article/view/343
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3943
AB  - This paper is aimed at defining two new advantageous maturation parameters based on distribution and abundance of phenanthrene (P) and methylphenanthrene (MP) isomers in the tricyclic fraction of aromatic hydrocarbons: MPI 3+1/PAI 1 and [2(2-MP+3-MP)+P]/1-MP. The applicability of newly proposed parameters was checked by correlation analysis. Depth of the reservoir rock, diasterane maturation parameter, as well as several typical aromatic fraction maturation parameters were used for this purpose. The examined oils (fourteen samples from nine oil fields of Sakhalin Island, Russia), were of Miocene age and from reservoir rocks of relatively wide range of depths (73-2841 m). All samples represented biodegraded, or mixtures of biodegraded and nonbiodegraded oils [1].
PB  - Kazakhstan : al-Farabi Kazakh National University
T2  - Eurasian Chemico-Technological Journal
T1  - Phenanthrene and Methylphenanthrene Isomers in Maturity Assessment of Biodegraded Crude Oils (Sakhalin, Russia)
VL  - 4
IS  - 3
SP  - 213
EP  - 220
DO  - 10.18321/ectj537
ER  - 

@article{
author = "Stojanović, Ksenija and Jovančićević, Branimir and Golovko, Anatoly and Golovko, Julia and Pevneva, Galina and Cvetković, Olga and Vitorović, Dragomir K.",
year = "2002",
abstract = "This paper is aimed at defining two new advantageous maturation parameters based on distribution and abundance of phenanthrene (P) and methylphenanthrene (MP) isomers in the tricyclic fraction of aromatic hydrocarbons: MPI 3+1/PAI 1 and [2(2-MP+3-MP)+P]/1-MP. The applicability of newly proposed parameters was checked by correlation analysis. Depth of the reservoir rock, diasterane maturation parameter, as well as several typical aromatic fraction maturation parameters were used for this purpose. The examined oils (fourteen samples from nine oil fields of Sakhalin Island, Russia), were of Miocene age and from reservoir rocks of relatively wide range of depths (73-2841 m). All samples represented biodegraded, or mixtures of biodegraded and nonbiodegraded oils [1].",
publisher = "Kazakhstan : al-Farabi Kazakh National University",
journal = "Eurasian Chemico-Technological Journal",
title = "Phenanthrene and Methylphenanthrene Isomers in Maturity Assessment of Biodegraded Crude Oils (Sakhalin, Russia)",
volume = "4",
number = "3",
pages = "213-220",
doi = "10.18321/ectj537"
}

Stojanović, K., Jovančićević, B., Golovko, A., Golovko, J., Pevneva, G., Cvetković, O.,& Vitorović, D. K.. (2002). Phenanthrene and Methylphenanthrene Isomers in Maturity Assessment of Biodegraded Crude Oils (Sakhalin, Russia). in Eurasian Chemico-Technological Journal
Kazakhstan : al-Farabi Kazakh National University., 4(3), 213-220.
https://doi.org/10.18321/ectj537

Stojanović K, Jovančićević B, Golovko A, Golovko J, Pevneva G, Cvetković O, Vitorović DK. Phenanthrene and Methylphenanthrene Isomers in Maturity Assessment of Biodegraded Crude Oils (Sakhalin, Russia). in Eurasian Chemico-Technological Journal. 2002;4(3):213-220.
doi:10.18321/ectj537 .

Stojanović, Ksenija, Jovančićević, Branimir, Golovko, Anatoly, Golovko, Julia, Pevneva, Galina, Cvetković, Olga, Vitorović, Dragomir K., "Phenanthrene and Methylphenanthrene Isomers in Maturity Assessment of Biodegraded Crude Oils (Sakhalin, Russia)" in Eurasian Chemico-Technological Journal, 4, no. 3 (2002):213-220,
https://doi.org/10.18321/ectj537 . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Wehner, H.
AU  - Scheeder, G.
AU  - Stojanović, Ksenija
AU  - Šainović, Aleksandar M.
AU  - Cvetković, Olga
AU  - Ercegovac, Marko
AU  - Vitorović, Dragomir K.
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/63
AB  - In a search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia), based on bulk and specific organic geochemical parameters, six out of eight Sirakovo, Bubušinac and Bradarac sedimentary core samples were found to possess typical source rock characteristics. By comparing the results observed for these sedimentary samples with the corresponding properties of the crude oils from the Sirakovo and Bradarac oil-gas fields, a positive organic geochemical oil-source rock correlation was experienced for the first time within this basin. This finding may be considered as an important step towards the ultimate organic geochemical/geological interpretation of the Drmno depression.
AB  - Ispitivani su sedimenti iz bušotina koje pripadaju lokacijama Sirakovo Bubušinac i Bradarac (depresija Drmno). Primenjene su organsko-geohemijske metode (određivanje sadržaja organskog ugljenika, bitumena i ugljovodonika, kao i određivanje raspodele i obilnosti bioloških markera tipa n-alkana izoprenoidnih alifatičnih alkana, triterpana i sterana) sa ciljem da se proceni njihova naftna potencijalnost. Za šest uzoraka utvrđen je visok stepen maturisanosti organske supstance, pripadnost "oil generation" fazi (Rr = 0,70 – 0,80 %), tercijarna starost i pretežno terestrijalno poreklo. Poređenjem sa sirovim naftama iz već otkrivenih naftnih ležišta bliskog lokaliteta (Sirakovo i Bradarac) utvrđena je značajna sličnost i prema maturisanosti i prema poreklu, na osnovu čega je između ispitivanih uzoraka sedimenata i nafti, prvi put kada je u pitanju depresija Drmno, definisana pozitivna korelacija nafta-izvorna stena.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Search for source rocks of the crude oils of the Drmno depression, southern part of the Pannonian Basin, Serbia
T1  - Traganje za izvornim stenama nafti depresije Drmno, južni deo Panonskog basena, Srbija
VL  - 67
IS  - 8-9
SP  - 553
EP  - 566
DO  - 10.2298/JSC0209553J
ER  - 

@article{
author = "Jovančićević, Branimir and Wehner, H. and Scheeder, G. and Stojanović, Ksenija and Šainović, Aleksandar M. and Cvetković, Olga and Ercegovac, Marko and Vitorović, Dragomir K.",
year = "2002",
abstract = "In a search for source rocks of the crude oils of the Drmno depression (southern part of the Pannonian Basin, Serbia), based on bulk and specific organic geochemical parameters, six out of eight Sirakovo, Bubušinac and Bradarac sedimentary core samples were found to possess typical source rock characteristics. By comparing the results observed for these sedimentary samples with the corresponding properties of the crude oils from the Sirakovo and Bradarac oil-gas fields, a positive organic geochemical oil-source rock correlation was experienced for the first time within this basin. This finding may be considered as an important step towards the ultimate organic geochemical/geological interpretation of the Drmno depression., Ispitivani su sedimenti iz bušotina koje pripadaju lokacijama Sirakovo Bubušinac i Bradarac (depresija Drmno). Primenjene su organsko-geohemijske metode (određivanje sadržaja organskog ugljenika, bitumena i ugljovodonika, kao i određivanje raspodele i obilnosti bioloških markera tipa n-alkana izoprenoidnih alifatičnih alkana, triterpana i sterana) sa ciljem da se proceni njihova naftna potencijalnost. Za šest uzoraka utvrđen je visok stepen maturisanosti organske supstance, pripadnost "oil generation" fazi (Rr = 0,70 – 0,80 %), tercijarna starost i pretežno terestrijalno poreklo. Poređenjem sa sirovim naftama iz već otkrivenih naftnih ležišta bliskog lokaliteta (Sirakovo i Bradarac) utvrđena je značajna sličnost i prema maturisanosti i prema poreklu, na osnovu čega je između ispitivanih uzoraka sedimenata i nafti, prvi put kada je u pitanju depresija Drmno, definisana pozitivna korelacija nafta-izvorna stena.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Search for source rocks of the crude oils of the Drmno depression, southern part of the Pannonian Basin, Serbia, Traganje za izvornim stenama nafti depresije Drmno, južni deo Panonskog basena, Srbija",
volume = "67",
number = "8-9",
pages = "553-566",
doi = "10.2298/JSC0209553J"
}

Jovančićević, B., Wehner, H., Scheeder, G., Stojanović, K., Šainović, A. M., Cvetković, O., Ercegovac, M.,& Vitorović, D. K.. (2002). Search for source rocks of the crude oils of the Drmno depression, southern part of the Pannonian Basin, Serbia. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 67(8-9), 553-566.
https://doi.org/10.2298/JSC0209553J

Jovančićević B, Wehner H, Scheeder G, Stojanović K, Šainović AM, Cvetković O, Ercegovac M, Vitorović DK. Search for source rocks of the crude oils of the Drmno depression, southern part of the Pannonian Basin, Serbia. in Journal of the Serbian Chemical Society. 2002;67(8-9):553-566.
doi:10.2298/JSC0209553J .

Jovančićević, Branimir, Wehner, H., Scheeder, G., Stojanović, Ksenija, Šainović, Aleksandar M., Cvetković, Olga, Ercegovac, Marko, Vitorović, Dragomir K., "Search for source rocks of the crude oils of the Drmno depression, southern part of the Pannonian Basin, Serbia" in Journal of the Serbian Chemical Society, 67, no. 8-9 (2002):553-566,
https://doi.org/10.2298/JSC0209553J . .

TY  - JOUR
AU  - Radojevic, M
AU  - Jović, Vidojko
AU  - Vitorović, Dragomir
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/66
AB  - The sorption of molecules of different size and polarity (water. n-hexane. isooctane, benzene. toluene, cyclohexane, carbon tetrachloride, isopropanol, isobutanol, methanol, ethanol) by sepiolite from Gores. i.e. from the biggest to-date known Yugoslav deposit, was studied in this work. The BET surface area observed with different sorbates varied from 227 to 314 m(2)/g. due to only partial migration of sorbate molecules into the pores or to imperfect packing of the sorbate molecules. The value of the outer surface area suggested that the average thickness of the fibers of Gores sepiolite was approximately 15 nm.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Study of sepiolite from Goles (Kosovo, Yugoslavia). I. Sorption capacity
VL  - 67
IS  - 7
SP  - 489
EP  - 497
DO  - 10.2298/JSC0207489R
ER  - 

@article{
author = "Radojevic, M and Jović, Vidojko and Vitorović, Dragomir",
year = "2002",
abstract = "The sorption of molecules of different size and polarity (water. n-hexane. isooctane, benzene. toluene, cyclohexane, carbon tetrachloride, isopropanol, isobutanol, methanol, ethanol) by sepiolite from Gores. i.e. from the biggest to-date known Yugoslav deposit, was studied in this work. The BET surface area observed with different sorbates varied from 227 to 314 m(2)/g. due to only partial migration of sorbate molecules into the pores or to imperfect packing of the sorbate molecules. The value of the outer surface area suggested that the average thickness of the fibers of Gores sepiolite was approximately 15 nm.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Study of sepiolite from Goles (Kosovo, Yugoslavia). I. Sorption capacity",
volume = "67",
number = "7",
pages = "489-497",
doi = "10.2298/JSC0207489R"
}

Radojevic, M., Jović, V.,& Vitorović, D.. (2002). Study of sepiolite from Goles (Kosovo, Yugoslavia). I. Sorption capacity. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 67(7), 489-497.
https://doi.org/10.2298/JSC0207489R

Radojevic M, Jović V, Vitorović D. Study of sepiolite from Goles (Kosovo, Yugoslavia). I. Sorption capacity. in Journal of the Serbian Chemical Society. 2002;67(7):489-497.
doi:10.2298/JSC0207489R .

Radojevic, M, Jović, Vidojko, Vitorović, Dragomir, "Study of sepiolite from Goles (Kosovo, Yugoslavia). I. Sorption capacity" in Journal of the Serbian Chemical Society, 67, no. 7 (2002):489-497,
https://doi.org/10.2298/JSC0207489R . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Šainović, Aleksandar M.
AU  - Cvetković, Olga
AU  - Filipović, Ivan T.
AU  - Ašanin, Petar M.
AU  - Vitorović, Dragomir K.
PY  - 2002
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/82
AB  - Samples of surface sediments originating from different localities in Serbia which contained more than 0.5 % organic matter were investigated in this paper. According to age, these samples were classified into two groups sediments of pretertiary age and sediments of tertiary age. Bulk and specific organic geochemical parameters were determined for their methylene chloride-methanol extracts, aimed at controling the relationship between the age of the sediment and the maturity of its organic substance. In this sense a general direct proportionality was observed. However, a better linear dependence of the bulk parameters was observed in the case of younger, tertiary sediments. That is to say, with samples of pretertiary age the organic matter maturity was approaching a definite limiting value contributing to an inferior linear dependence of their bulk maturation parameters. Nevertheless, the dependence was found to be preserved with specific maturation parameters (e.g., CPI; Fit/n-C18), the changes of which are generally more intensive at higher maturity degrees.
AB  - U ovom radu ispitivani su uzorci površinskih sedimenata sa različitih lokaliteta Srbije i sadržajem od preko 0,5% organske supstance, koji su se prema starosti mogli svrstati u dve grupe: sedimentne stene pretercijarne i sedimentne stene tercijarne starosti. U njihovim metilen-hlorid metanolskim ekstraktima određeni su grupni i specifični organsko-geohemijski maturacioni parametri da bi se proučilo da li postoji veza između starosti sedimenata i maturisanosti njihove organske supstance. U tom smislu, utvrđeno je da postoji opšta direktna propordonalnost. Međutim, nađeno je da grupni maturacioni parametri pokazuju bolju linearnu zavisnost kod mlađih, tercijarnih sedimenata. Naime, kod uzoraka pretercijarne starosti maturisanost organske supstance u većoj meri se približavala određenoj graničnoj vrednosti što je doprinosilo smanjenju očekivane linearne zavisnosti njihovih grupnih maturacionih parametara. Ipak, ta zavisnost je sačuvana kod specifičnih maturacionih parametara (na primer: CPI; Fit/n-C18) koji se izrazitije menjaju na višim stepenima maturisanosti.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation
T1  - Ispitivanje pretercijarnih i tercijarnih površinskih sedimenata Srbije - organsko-geohemijska interpretacija
VL  - 56
IS  - 1
SP  - 25
EP  - 29
DO  - 10.2298/HEMIND0201025J
ER  - 

@article{
author = "Jovančićević, Branimir and Šainović, Aleksandar M. and Cvetković, Olga and Filipović, Ivan T. and Ašanin, Petar M. and Vitorović, Dragomir K.",
year = "2002",
abstract = "Samples of surface sediments originating from different localities in Serbia which contained more than 0.5 % organic matter were investigated in this paper. According to age, these samples were classified into two groups sediments of pretertiary age and sediments of tertiary age. Bulk and specific organic geochemical parameters were determined for their methylene chloride-methanol extracts, aimed at controling the relationship between the age of the sediment and the maturity of its organic substance. In this sense a general direct proportionality was observed. However, a better linear dependence of the bulk parameters was observed in the case of younger, tertiary sediments. That is to say, with samples of pretertiary age the organic matter maturity was approaching a definite limiting value contributing to an inferior linear dependence of their bulk maturation parameters. Nevertheless, the dependence was found to be preserved with specific maturation parameters (e.g., CPI; Fit/n-C18), the changes of which are generally more intensive at higher maturity degrees., U ovom radu ispitivani su uzorci površinskih sedimenata sa različitih lokaliteta Srbije i sadržajem od preko 0,5% organske supstance, koji su se prema starosti mogli svrstati u dve grupe: sedimentne stene pretercijarne i sedimentne stene tercijarne starosti. U njihovim metilen-hlorid metanolskim ekstraktima određeni su grupni i specifični organsko-geohemijski maturacioni parametri da bi se proučilo da li postoji veza između starosti sedimenata i maturisanosti njihove organske supstance. U tom smislu, utvrđeno je da postoji opšta direktna propordonalnost. Međutim, nađeno je da grupni maturacioni parametri pokazuju bolju linearnu zavisnost kod mlađih, tercijarnih sedimenata. Naime, kod uzoraka pretercijarne starosti maturisanost organske supstance u većoj meri se približavala određenoj graničnoj vrednosti što je doprinosilo smanjenju očekivane linearne zavisnosti njihovih grupnih maturacionih parametara. Ipak, ta zavisnost je sačuvana kod specifičnih maturacionih parametara (na primer: CPI; Fit/n-C18) koji se izrazitije menjaju na višim stepenima maturisanosti.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation, Ispitivanje pretercijarnih i tercijarnih površinskih sedimenata Srbije - organsko-geohemijska interpretacija",
volume = "56",
number = "1",
pages = "25-29",
doi = "10.2298/HEMIND0201025J"
}

Jovančićević, B., Šainović, A. M., Cvetković, O., Filipović, I. T., Ašanin, P. M.,& Vitorović, D. K.. (2002). Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation. in Hemijska industrija
Association of Chemical Engineers of Serbia., 56(1), 25-29.
https://doi.org/10.2298/HEMIND0201025J

Jovančićević B, Šainović AM, Cvetković O, Filipović IT, Ašanin PM, Vitorović DK. Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation. in Hemijska industrija. 2002;56(1):25-29.
doi:10.2298/HEMIND0201025J .

Jovančićević, Branimir, Šainović, Aleksandar M., Cvetković, Olga, Filipović, Ivan T., Ašanin, Petar M., Vitorović, Dragomir K., "Investigation of pretertiary and tertiary surface sediments from Serbia: Organic geochemical interpretation" in Hemijska industrija, 56, no. 1 (2002):25-29,
https://doi.org/10.2298/HEMIND0201025J . .

TY  - JOUR
AU  - Cvetković, Olga
AU  - Curiale, Joseph A.
AU  - Dragutinović, Vesna
AU  - Jarvie, Daniel
AU  - Vrvić, Miroslav
AU  - Vitorović, Dragomir
PY  - 2001
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/31
AB  - Aleksinac oil shale organic matter appeared to remain unchanged, according to elemental, IR, P-GC and P-GC-MS analytical characterization, after exposure to Bacillus circulans-Jordan desilicification for 30 days. These experiments indicate that 'siliceous bacteria' may have potential as an alternative, 'biochemical agent' for the isolation of native kerogen, and justify further efforts toward continue devaluation of this advantageous process.
AB  - Na osnovu elementarne, infracrvene i pirolitičko-gasnohromatografsko-masenospektrometrijske analize pre i posle 30-dnevne obrade pomoću Bacillus circulans-Jordan, ukazano je na relativno dobru postojanost organske supstance aleksinačkog bituminoznog škriljca pri bakterijskoj desilicifikaciji. Činjenica da se sedimentna organska supstanca pri ovoj bakterijskoj obradi nije bitnije menjala opravdava dalje napore ka poboljšanju efikasnosti bakterijskog desilicifikacionog procesa.
PB  - Serbian Chemical Society
T2  - Journal of the Serbian Chemical Society
T1  - Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale
T1  - Dokaz o postojanosti sedimentne organske supstance pri bakterijskoj desilicifikaciji jednog uzorka bituminoznog škriljca
VL  - 66
IS  - 2
SP  - 95
EP  - 99
UR  - https://hdl.handle.net/21.15107/rcub_cer_31
ER  - 

@article{
author = "Cvetković, Olga and Curiale, Joseph A. and Dragutinović, Vesna and Jarvie, Daniel and Vrvić, Miroslav and Vitorović, Dragomir",
year = "2001",
abstract = "Aleksinac oil shale organic matter appeared to remain unchanged, according to elemental, IR, P-GC and P-GC-MS analytical characterization, after exposure to Bacillus circulans-Jordan desilicification for 30 days. These experiments indicate that 'siliceous bacteria' may have potential as an alternative, 'biochemical agent' for the isolation of native kerogen, and justify further efforts toward continue devaluation of this advantageous process., Na osnovu elementarne, infracrvene i pirolitičko-gasnohromatografsko-masenospektrometrijske analize pre i posle 30-dnevne obrade pomoću Bacillus circulans-Jordan, ukazano je na relativno dobru postojanost organske supstance aleksinačkog bituminoznog škriljca pri bakterijskoj desilicifikaciji. Činjenica da se sedimentna organska supstanca pri ovoj bakterijskoj obradi nije bitnije menjala opravdava dalje napore ka poboljšanju efikasnosti bakterijskog desilicifikacionog procesa.",
publisher = "Serbian Chemical Society",
journal = "Journal of the Serbian Chemical Society",
title = "Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale, Dokaz o postojanosti sedimentne organske supstance pri bakterijskoj desilicifikaciji jednog uzorka bituminoznog škriljca",
volume = "66",
number = "2",
pages = "95-99",
url = "https://hdl.handle.net/21.15107/rcub_cer_31"
}

Cvetković, O., Curiale, J. A., Dragutinović, V., Jarvie, D., Vrvić, M.,& Vitorović, D.. (2001). Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale. in Journal of the Serbian Chemical Society
Serbian Chemical Society., 66(2), 95-99.
https://hdl.handle.net/21.15107/rcub_cer_31

Cvetković O, Curiale JA, Dragutinović V, Jarvie D, Vrvić M, Vitorović D. Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale. in Journal of the Serbian Chemical Society. 2001;66(2):95-99.
https://hdl.handle.net/21.15107/rcub_cer_31 .

Cvetković, Olga, Curiale, Joseph A., Dragutinović, Vesna, Jarvie, Daniel, Vrvić, Miroslav, Vitorović, Dragomir, "Evidence of stability of sedimentary organic matter during bacterial desilicification of an oil shale" in Journal of the Serbian Chemical Society, 66, no. 2 (2001):95-99,
https://hdl.handle.net/21.15107/rcub_cer_31 .

TY  - JOUR
AU  - Aleksić, Bojana D.
AU  - Aleksić, Bogdan R.
AU  - Marković, Bojana
AU  - Cvetković, Olga
AU  - Ercegovac, M.D.
AU  - Vitorović, Dragomir K.
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/24
AB  - The behaviour of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-molybdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (-86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.
PB  - Association of the Chemical Engineers of Serbia
T2  - Chemical Industry and Chemical Engineering Quarterly / CICEQ
T1  - Direct liquefaction of soft brown coal from the Kosovo Basin
T1  - Likvefakcija mekog mrkog uglja Kosovskog Basena
VL  - 6
IS  - 2
SP  - 265
EP  - 270
UR  - https://hdl.handle.net/21.15107/rcub_cer_24
ER  - 

@article{
author = "Aleksić, Bojana D. and Aleksić, Bogdan R. and Marković, Bojana and Cvetković, Olga and Ercegovac, M.D. and Vitorović, Dragomir K.",
year = "2000",
abstract = "The behaviour of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-molybdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (-86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Chemical Industry and Chemical Engineering Quarterly / CICEQ",
title = "Direct liquefaction of soft brown coal from the Kosovo Basin, Likvefakcija mekog mrkog uglja Kosovskog Basena",
volume = "6",
number = "2",
pages = "265-270",
url = "https://hdl.handle.net/21.15107/rcub_cer_24"
}

Aleksić, B. D., Aleksić, B. R., Marković, B., Cvetković, O., Ercegovac, M.D.,& Vitorović, D. K.. (2000). Direct liquefaction of soft brown coal from the Kosovo Basin. in Chemical Industry and Chemical Engineering Quarterly / CICEQ
Association of the Chemical Engineers of Serbia., 6(2), 265-270.
https://hdl.handle.net/21.15107/rcub_cer_24

Aleksić BD, Aleksić BR, Marković B, Cvetković O, Ercegovac M, Vitorović DK. Direct liquefaction of soft brown coal from the Kosovo Basin. in Chemical Industry and Chemical Engineering Quarterly / CICEQ. 2000;6(2):265-270.
https://hdl.handle.net/21.15107/rcub_cer_24 .

Aleksić, Bojana D., Aleksić, Bogdan R., Marković, Bojana, Cvetković, Olga, Ercegovac, M.D., Vitorović, Dragomir K., "Direct liquefaction of soft brown coal from the Kosovo Basin" in Chemical Industry and Chemical Engineering Quarterly / CICEQ, 6, no. 2 (2000):265-270,
https://hdl.handle.net/21.15107/rcub_cer_24 .

TY  - JOUR
AU  - Aleksić, Bojana D.
AU  - Aleksić, Bogdan R.
AU  - Marković, Branislav Ž.
AU  - Cvetković, Olga
AU  - Ercegovac, Marko D.
AU  - Vitorović, Dragomir K.
PY  - 2000
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/20
AB  - The behavior of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-moly­bdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (~86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages.
AB  - Ispitivano je ponašanje mekog mrkog uglja Kosovskog basena (Jugoslavija) pri direktnoj likvefakciji. Katalitička hidrogenizacija izvođena je u protočnom šaržnom reaktoru propuštanjem vodonika kroz suspenziju tetralina i usitnjenog uglja, u prisustvu komercijalnog presulfidiziranog CO-MO/AI2O3 katalizatora. Eksperimenti su izvođeni na temperaturi 365 i 440°C, pritisku 13,5 i 15,0 MPa, u trajanju 1-8 sati. Reaktivnost uglja je procenjivana i ukupna totalna konverzija izračunavana je na osnovu prinosa tečnih proizvoda rastvornih u n-heptanu (laka ulja), asfaltena (proizvodi nerastvorni u n-heptanu) i čvrstog ostatka. Konverzija uglja pri navedenim uslovima iznosila je oko 80 %, a najveća je bila (~86 %) pri najdužem reakcionom vremenu. Mikropetrografskom analizom identifikovane su različite vrste zrna modifikovanog uglja kao i novo stvoreni tipovi zrna uglja kao i mineralnog materijala. Dobijeni rezultati ukazuju da se gasovi oslobađaju u početnim fazama hidrogenizacije, a da polimerizacijom tečnih proizvoda polu-koks i koks postaju u kasnijim fazama hidrogenizacije.
PB  - Association of Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Direct liquefaction of soft brown coal from the Kosovo basin
T1  - Likvefakcija mekog mrkog uglja kosovskog basena
VL  - 54
IS  - 6
SP  - 265
EP  - 269
UR  - https://hdl.handle.net/21.15107/rcub_cer_20
ER  - 

@article{
author = "Aleksić, Bojana D. and Aleksić, Bogdan R. and Marković, Branislav Ž. and Cvetković, Olga and Ercegovac, Marko D. and Vitorović, Dragomir K.",
year = "2000",
abstract = "The behavior of Kosovo Basin (Yugoslavia) soft brown coal was studied during a direct liquefaction process by catalytic hydrogenation. A stream of hydrogen was passed through a tetralin dispersion of the pulverized coal in the presence of commercial extruded hydrogenating-desulphurizing cobalt-moly­bdenum/alumina catalyst. The experiments were carried out in the temperature range between 365 and 440°C at 13.5 and 15.0 MPa, the reactants being kept at selected stationary working conditions for 1-8 hrs. The yields of liquid products soluble in n-heptane (light oils), asphaltenes (n-heptane insoluble liquid products) and the solid coal residue served as a basis for the estimation of coal reactivity and for the calculation of total coal conversion. The liquid product yields varied substantially depending on the reaction temperature and the residence time. The total conversion under most of the applied reaction conditions was found to be around 80%, the highest (~86%) being observed with the longest, 8 h residence time. Various types of grains of modified coal and newly formed types of coal grains, as well as mineral matter were identified by micropetrographic analysis, indicating the release of gases in the initial stages of hydrogenation and the formation of semi-coke and coke by the polymerization of liquid products in the later reaction stages., Ispitivano je ponašanje mekog mrkog uglja Kosovskog basena (Jugoslavija) pri direktnoj likvefakciji. Katalitička hidrogenizacija izvođena je u protočnom šaržnom reaktoru propuštanjem vodonika kroz suspenziju tetralina i usitnjenog uglja, u prisustvu komercijalnog presulfidiziranog CO-MO/AI2O3 katalizatora. Eksperimenti su izvođeni na temperaturi 365 i 440°C, pritisku 13,5 i 15,0 MPa, u trajanju 1-8 sati. Reaktivnost uglja je procenjivana i ukupna totalna konverzija izračunavana je na osnovu prinosa tečnih proizvoda rastvornih u n-heptanu (laka ulja), asfaltena (proizvodi nerastvorni u n-heptanu) i čvrstog ostatka. Konverzija uglja pri navedenim uslovima iznosila je oko 80 %, a najveća je bila (~86 %) pri najdužem reakcionom vremenu. Mikropetrografskom analizom identifikovane su različite vrste zrna modifikovanog uglja kao i novo stvoreni tipovi zrna uglja kao i mineralnog materijala. Dobijeni rezultati ukazuju da se gasovi oslobađaju u početnim fazama hidrogenizacije, a da polimerizacijom tečnih proizvoda polu-koks i koks postaju u kasnijim fazama hidrogenizacije.",
publisher = "Association of Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Direct liquefaction of soft brown coal from the Kosovo basin, Likvefakcija mekog mrkog uglja kosovskog basena",
volume = "54",
number = "6",
pages = "265-269",
url = "https://hdl.handle.net/21.15107/rcub_cer_20"
}

Aleksić, B. D., Aleksić, B. R., Marković, B. Ž., Cvetković, O., Ercegovac, M. D.,& Vitorović, D. K.. (2000). Direct liquefaction of soft brown coal from the Kosovo basin. in Hemijska industrija
Association of Chemical Engineers of Serbia., 54(6), 265-269.
https://hdl.handle.net/21.15107/rcub_cer_20

Aleksić BD, Aleksić BR, Marković BŽ, Cvetković O, Ercegovac MD, Vitorović DK. Direct liquefaction of soft brown coal from the Kosovo basin. in Hemijska industrija. 2000;54(6):265-269.
https://hdl.handle.net/21.15107/rcub_cer_20 .

Aleksić, Bojana D., Aleksić, Bogdan R., Marković, Branislav Ž., Cvetković, Olga, Ercegovac, Marko D., Vitorović, Dragomir K., "Direct liquefaction of soft brown coal from the Kosovo basin" in Hemijska industrija, 54, no. 6 (2000):265-269,
https://hdl.handle.net/21.15107/rcub_cer_20 .

TY  - JOUR
AU  - Aleksić, Bogdan R.
AU  - Ercegovac, Marko D.
AU  - Cvetković, Olga
AU  - Marković, Branislav Ž.
AU  - Aleksić, Bojana D.
AU  - Vitorović, Dragomir
PY  - 1998
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5858
AB  - The behaviour of the soft brown coal from the Kostolac Mine (Serbia, Yugoslavia) was investigated during hydroliquefaction carried out in a batch reactor by direct catalytic hydrogenation of the pulverized coal (- 160 μm) dispersed in tetralin. The effects of temperature (ranging from 365 to 440°C), pressure (13.5 to 15.0 MPa) and residence time (1 to 8 h) on the yield of individual liquefaction products as well as the petrographic composition of the coal residues were closely followed by separation and analysis of the products. These consisted of liquid products soluble in n-heptane (light oils), n-heptane insoluble products (asphaltenes), the solid coal residue and gaseous products. A good reactivity of this soft brown coal was observed. The yield of liquid products varied from 23 to 64 wt.% (based on dry ash-free coal). A total coal conversion of 80 to 86% was achieved. Petrographic composition and optical properties of the solid coal residues were analyzed microscopically in order to establish the character and intensity of the coal changes. The solid residues were found to consist of 12 various grain categories. The low proportions of unreacted or partly reacted coal grains confirmed the good reactivity of the Kostolac soft brown coal in the applied liquefaction process.
PB  - Elsevier B.V.
T2  - Fuel Processing Technology
T1  - Direct hydroliquefaction of a low rank soft brown coal
VL  - 58
IS  - 1
SP  - 33
SP  - 43
DO  - 10.1016/S0378-3820(98)00079-4
ER  - 

@article{
author = "Aleksić, Bogdan R. and Ercegovac, Marko D. and Cvetković, Olga and Marković, Branislav Ž. and Aleksić, Bojana D. and Vitorović, Dragomir",
year = "1998",
abstract = "The behaviour of the soft brown coal from the Kostolac Mine (Serbia, Yugoslavia) was investigated during hydroliquefaction carried out in a batch reactor by direct catalytic hydrogenation of the pulverized coal (- 160 μm) dispersed in tetralin. The effects of temperature (ranging from 365 to 440°C), pressure (13.5 to 15.0 MPa) and residence time (1 to 8 h) on the yield of individual liquefaction products as well as the petrographic composition of the coal residues were closely followed by separation and analysis of the products. These consisted of liquid products soluble in n-heptane (light oils), n-heptane insoluble products (asphaltenes), the solid coal residue and gaseous products. A good reactivity of this soft brown coal was observed. The yield of liquid products varied from 23 to 64 wt.% (based on dry ash-free coal). A total coal conversion of 80 to 86% was achieved. Petrographic composition and optical properties of the solid coal residues were analyzed microscopically in order to establish the character and intensity of the coal changes. The solid residues were found to consist of 12 various grain categories. The low proportions of unreacted or partly reacted coal grains confirmed the good reactivity of the Kostolac soft brown coal in the applied liquefaction process.",
publisher = "Elsevier B.V.",
journal = "Fuel Processing Technology",
title = "Direct hydroliquefaction of a low rank soft brown coal",
volume = "58",
number = "1",
pages = "33-43",
doi = "10.1016/S0378-3820(98)00079-4"
}

Aleksić, B. R., Ercegovac, M. D., Cvetković, O., Marković, B. Ž., Aleksić, B. D.,& Vitorović, D.. (1998). Direct hydroliquefaction of a low rank soft brown coal. in Fuel Processing Technology
Elsevier B.V.., 58(1), 33.
https://doi.org/10.1016/S0378-3820(98)00079-4

Aleksić BR, Ercegovac MD, Cvetković O, Marković BŽ, Aleksić BD, Vitorović D. Direct hydroliquefaction of a low rank soft brown coal. in Fuel Processing Technology. 1998;58(1):33.
doi:10.1016/S0378-3820(98)00079-4 .

Aleksić, Bogdan R., Ercegovac, Marko D., Cvetković, Olga, Marković, Branislav Ž., Aleksić, Bojana D., Vitorović, Dragomir, "Direct hydroliquefaction of a low rank soft brown coal" in Fuel Processing Technology, 58, no. 1 (1998):33,
https://doi.org/10.1016/S0378-3820(98)00079-4 . .

TY  - JOUR
AU  - Vitorović, Dragomir
AU  - Aleksić, Bogdan R.
AU  - Ercegovac, Marko
AU  - Aleksić, Bojana D.
AU  - Kontorovič, Svetlana I.
AU  - Marković, Branislav Ž.
AU  - Cvetković, Olga
AU  - Mitrovski, Svetlana M.
PY  - 1994
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5859
AB  - The behaviour of Kolubara soft brown coal during direct liquefaction by catalytic hydrogenation was studied and was compared with the Banovići brown coal investigated previously. A sample of washed and dried coal was ground dry, or was ground in the presence of different liquids. Addition of water during grinding resulted in a somewhat coarser granular composition, while n-heptane did not have a noticeable effect. High reactivity of the soft brown coal, which initially was indicated by thermal analysis, was confirmed by high yields of liquid products, particularly of oils soluble in n-heptane. The solid liquefaction residues did not contain pyrolytic carbon and cenospheres, and contained a low proportion of humoplasts indicating the high liquefaction efficiency of the coal in spite of its high content of xylite.
PB  - Elsevier B.V.
T2  - Fuel
T1  - Liquefaction behaviour of Kolubara soft brown coal
VL  - 73
IS  - 11
SP  - 1757
EP  - 1765
DO  - 10.1016/0016-2361(94)90164-3
ER  - 

@article{
author = "Vitorović, Dragomir and Aleksić, Bogdan R. and Ercegovac, Marko and Aleksić, Bojana D. and Kontorovič, Svetlana I. and Marković, Branislav Ž. and Cvetković, Olga and Mitrovski, Svetlana M.",
year = "1994",
abstract = "The behaviour of Kolubara soft brown coal during direct liquefaction by catalytic hydrogenation was studied and was compared with the Banovići brown coal investigated previously. A sample of washed and dried coal was ground dry, or was ground in the presence of different liquids. Addition of water during grinding resulted in a somewhat coarser granular composition, while n-heptane did not have a noticeable effect. High reactivity of the soft brown coal, which initially was indicated by thermal analysis, was confirmed by high yields of liquid products, particularly of oils soluble in n-heptane. The solid liquefaction residues did not contain pyrolytic carbon and cenospheres, and contained a low proportion of humoplasts indicating the high liquefaction efficiency of the coal in spite of its high content of xylite.",
publisher = "Elsevier B.V.",
journal = "Fuel",
title = "Liquefaction behaviour of Kolubara soft brown coal",
volume = "73",
number = "11",
pages = "1757-1765",
doi = "10.1016/0016-2361(94)90164-3"
}

Vitorović, D., Aleksić, B. R., Ercegovac, M., Aleksić, B. D., Kontorovič, S. I., Marković, B. Ž., Cvetković, O.,& Mitrovski, S. M.. (1994). Liquefaction behaviour of Kolubara soft brown coal. in Fuel
Elsevier B.V.., 73(11), 1757-1765.
https://doi.org/10.1016/0016-2361(94)90164-3

Vitorović D, Aleksić BR, Ercegovac M, Aleksić BD, Kontorovič SI, Marković BŽ, Cvetković O, Mitrovski SM. Liquefaction behaviour of Kolubara soft brown coal. in Fuel. 1994;73(11):1757-1765.
doi:10.1016/0016-2361(94)90164-3 .

Vitorović, Dragomir, Aleksić, Bogdan R., Ercegovac, Marko, Aleksić, Bojana D., Kontorovič, Svetlana I., Marković, Branislav Ž., Cvetković, Olga, Mitrovski, Svetlana M., "Liquefaction behaviour of Kolubara soft brown coal" in Fuel, 73, no. 11 (1994):1757-1765,
https://doi.org/10.1016/0016-2361(94)90164-3 . .

TY  - JOUR
AU  - Jovančićević, Branimir
AU  - Vitorović, Dragomir K.
AU  - Šaban, M.
AU  - Wehner, H.
PY  - 1992
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4323
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 . .