TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra B.
AU  - Pešić, Radojica
AU  - Orlović, Aleksandar M.
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5184
AB  - Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography–mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on σ and τ active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.
PB  - Association of the Chemical Engineers of Serbia
T2  - Hemijska industrija
T1  - Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling
T1  - Desulfurizacija dibenzotiofena i 4,6 – dimetildibenzotiofena procesom hidrogenovanja uz korišćenje RePd–TiO2/SiO2 aerogel katalizatora: proračun kinetičkih parametara i simulacijaprocesa
EP  - 145
IS  - 3
SP  - 135
VL  - 76
DO  - 10.2298/HEMIND220114008P
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra B. and Pešić, Radojica and Orlović, Aleksandar M.",
year = "2022",
abstract = "Re/Pd-TiO2/SiO2 aerogel catalysts were synthesized by using a sol-gel method and supercritical drying in excess solvent and investigated in the reaction of hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). Both Re/Pd catalysts, obtained with and without the use of mesitylene in the synthesis step, have shown increased conversions of up to 70 % in the desulphurization of 4,6-DMDBT, when compared to conventional Co/Mo hydroprocessing catalysts. This observation is of importance for conversion of highly refractory 4,6-DMDBT and hydroprocessing to produce ultra-low sulphur diesel fuels, ULSD. In order to quantify the extent of desulphurisation, which proceeds via a hydrogenation route, conversions of DBT and 4,6-DMDBT along with evolution of reaction products characteristic for the direct desulphurisation route and the hydrogenation route were monitored by using a gas chromatography–mass spectrometry (GC-MS) analytical technique. The reaction was performed at 630 K and 6 MPa in a batch catalytic reactor. The experimental results were used in the Hougen-Watson kinetic model describing DBT and 4,6-DMDBT desulphurisation on σ and τ active sites. Kinetic parameters of this complex catalytic kinetics were determined by using a Genetic Algorithm method and minimum deviation function. Values of calculated kinetic parameters and values of the ratio of 3-methylcyclohexyltoluene (MCHT and dimethyl biphenyl (DMBPH) expressed as the MCHT/(MCHT+DMBPH) ratio ranging between 0.66 and 0.94, have confirmed that the hydrogenation route is the dominant route for desulphurisation of 4,6-DMDBT.",
publisher = "Association of the Chemical Engineers of Serbia",
journal = "Hemijska industrija",
title = "Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling, Desulfurizacija dibenzotiofena i 4,6 – dimetildibenzotiofena procesom hidrogenovanja uz korišćenje RePd–TiO2/SiO2 aerogel katalizatora: proračun kinetičkih parametara i simulacijaprocesa",
pages = "145-135",
number = "3",
volume = "76",
doi = "10.2298/HEMIND220114008P"
}

Prokić-Vidojević, D., Glišić, S. B., Pešić, R.,& Orlović, A. M.. (2022). Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling. in Hemijska industrija
Association of the Chemical Engineers of Serbia., 76(3), 135-145.
https://doi.org/10.2298/HEMIND220114008P

Prokić-Vidojević D, Glišić SB, Pešić R, Orlović AM. Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling. in Hemijska industrija. 2022;76(3):135-145.
doi:10.2298/HEMIND220114008P .

Prokić-Vidojević, Dragana, Glišić, Sandra B., Pešić, Radojica, Orlović, Aleksandar M., "Desulphurisation of dibenzothiophene and 4,6 – dimethyl dibenzothio-phene via enhanced hydrogenation reaction route using RePd–TiO2/SiO2 aerogel catalysts: Kinetic parameters estimation and modelling" in Hemijska industrija, 76, no. 3 (2022):135-145,
https://doi.org/10.2298/HEMIND220114008P . .

TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra
AU  - Krstić, Jugoslav B.
AU  - Orlović, Aleksandar
PY  - 2021
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4860
AB  - Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.
T2  - Catalysis Today
T1  - Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene
EP  - 23
SP  - 10
VL  - 378
DO  - 10.1016/j.cattod.2020.11.022
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra and Krstić, Jugoslav B. and Orlović, Aleksandar",
year = "2021",
abstract = "Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 aerogel catalysts were synthesized using sol-gel method and super-critical drying in excess solvent, and investigated in the hydrodesulphurisation (HDS) of dibenzothiophene (DBT) and 4,6-dimethyl dibenzothiophene (4,6-DMDBT). The influence of supercritical drying on the final catalytic properties of the materials was determined by parallel synthesis of aerogels and xerogels for Re/Pd-TiO2/SiO2 catalysts. The sol-gel method and supercritical drying were found to result in amorphous aerogels with relatively high degree of uniformity, of both supports and active phases. Corresponding xerogels were found to be similar to aerogels in terms of composition and structure, but characterized by lower specific surface areas. Catalytic activity of Co/Mo-Al2O3/SiO2 aerogel catalysts in HDS of DBT and 4,6-DMDBT has shown no major improvement in comparison to conventional Co/Mo catalyst. On the other hand, Re/Pd-TiO2/SiO2 aerogels, obtained with the addition of mesitylene or without it, achieved 70 % and 64 % higher conversion of 4,6-DMDBT than conventional Co/Mo catalyst, respectively. Increased catalytic activity can be attributed to well dispersed Re and Pd active phases across the catalyst structure, good incorporation of Ti within silica matrix, increased mesopore volumes and high specific surface areas.",
journal = "Catalysis Today",
title = "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene",
pages = "23-10",
volume = "378",
doi = "10.1016/j.cattod.2020.11.022"
}

Prokić-Vidojević, D., Glišić, S., Krstić, J. B.,& Orlović, A.. (2021). Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today, 378, 10-23.
https://doi.org/10.1016/j.cattod.2020.11.022

Prokić-Vidojević D, Glišić S, Krstić JB, Orlović A. Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene. in Catalysis Today. 2021;378:10-23.
doi:10.1016/j.cattod.2020.11.022 .

Prokić-Vidojević, Dragana, Glišić, Sandra, Krstić, Jugoslav B., Orlović, Aleksandar, "Aerogel Re/Pd-TiO2/SiO2 and Co/Mo-Al2O3/SiO2 catalysts for hydrodesulphurisation of dibenzothiophene and 4,6-dimethyldibenzothiophene" in Catalysis Today, 378 (2021):10-23,
https://doi.org/10.1016/j.cattod.2020.11.022 . .

TY  - JOUR
AU  - Prokić-Vidojević, Dragana
AU  - Glišić, Sandra
AU  - Orlović, Aleksandar
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3533
AB  - Textural characteristics of catalysts and catalysts supports are of a prime importance when it comes to their application in processing of high molecular weight compounds. Drying procedure is a key factor in preservation of wet gel properties. Hexagonal mesoporous silicas (HMS) doped with Ti-ions is finding a promising usage as heterogeneous catalysts support. In this paper, the effect of supercritical drying with excess solvent on the textural characteristics of Ti- HMS is addressed. HMS with Ti ions (Si/Ti atomic ratio of 40) is prepared using the sol-gel method. Dodecylamine is used as the structure directing surfactant (S) and TEOS and Titanium butoxide as the inorganic precursors (I). Specific surface area, mesoporosity and pore volume of the support dried by thermal evaporation of solvent in air and dried in excess of supercritical ethanol are compared. The results indicate that improved specific surface area and almost four times bigger value for mesopore volume are obtained using supercritical drying procedure.
AB  - Teksturalne karakteristike katalizatora i nosača katalizatora su od izuzetne važnosti kad je u pitanju korišćenje katalizatora u procesima u kojima učestvuju jedinjenja velike molekulske mase. Način sušenja vlažnog gela igra značajnu ulogu u očuvanju njegovih karakteristika. Heksagonalna mezoporozna silika (HMS) sa jonima titanijuma sve se vise koristi kao nosač heterogenih katalizatora. U ovom radu je predstavljen uticaj sušenja u višku rastvarača u natkritičnim uslovima na teksturalne karakteristike Ti-HMS. HMS sa jonima Ti (Si/Ti atomskog odnosa 40) sintetisana je primenom sol-gel metode. Kao templejt za formiranje struktura korišćen je dodecilamin (S°), a kao neorganski prekursori (I°) tetraetilortosilikat (TEOS) i titanijum butoksid. Upoređene su specifična površina, mezoporoznost i zapremina pora nosača sušenog termičkom evaporacijom rastvarača u vazduhu i nosača sušenog u višku natkritičnog etanola. Rezultati pokazuju da je korišćenjem natkritičnog sušenja poboljšana vrednost specifične površine nosača i dobijena četiri puta veća vrednost zapremine mezopora.
PB  - Military Technical Institute, Belgrade
T2  - Scientific Technical Review
T1  - Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support
T1  - Vozdejstvie suški v izbytke sverhkritičeskogo rastvoritelja na teksturnye harakteristiki nositelja katalizatora Ti-HMS / (francuski) Influence du séchage dans l'excès du solvant supercritique sur les caractéristiques texturales du support de catalyseur Ti-HMS)
T1  - Uticaj sušenja u višku natkritičnog rastvarača na teksturalne karakteristike nosača katalizatora Ti-HMS
EP  - 28
IS  - 1
SP  - 21
VL  - 67
DO  - 10.5937/STR1701021P
ER  - 

@article{
author = "Prokić-Vidojević, Dragana and Glišić, Sandra and Orlović, Aleksandar",
year = "2017",
abstract = "Textural characteristics of catalysts and catalysts supports are of a prime importance when it comes to their application in processing of high molecular weight compounds. Drying procedure is a key factor in preservation of wet gel properties. Hexagonal mesoporous silicas (HMS) doped with Ti-ions is finding a promising usage as heterogeneous catalysts support. In this paper, the effect of supercritical drying with excess solvent on the textural characteristics of Ti- HMS is addressed. HMS with Ti ions (Si/Ti atomic ratio of 40) is prepared using the sol-gel method. Dodecylamine is used as the structure directing surfactant (S) and TEOS and Titanium butoxide as the inorganic precursors (I). Specific surface area, mesoporosity and pore volume of the support dried by thermal evaporation of solvent in air and dried in excess of supercritical ethanol are compared. The results indicate that improved specific surface area and almost four times bigger value for mesopore volume are obtained using supercritical drying procedure., Teksturalne karakteristike katalizatora i nosača katalizatora su od izuzetne važnosti kad je u pitanju korišćenje katalizatora u procesima u kojima učestvuju jedinjenja velike molekulske mase. Način sušenja vlažnog gela igra značajnu ulogu u očuvanju njegovih karakteristika. Heksagonalna mezoporozna silika (HMS) sa jonima titanijuma sve se vise koristi kao nosač heterogenih katalizatora. U ovom radu je predstavljen uticaj sušenja u višku rastvarača u natkritičnim uslovima na teksturalne karakteristike Ti-HMS. HMS sa jonima Ti (Si/Ti atomskog odnosa 40) sintetisana je primenom sol-gel metode. Kao templejt za formiranje struktura korišćen je dodecilamin (S°), a kao neorganski prekursori (I°) tetraetilortosilikat (TEOS) i titanijum butoksid. Upoređene su specifična površina, mezoporoznost i zapremina pora nosača sušenog termičkom evaporacijom rastvarača u vazduhu i nosača sušenog u višku natkritičnog etanola. Rezultati pokazuju da je korišćenjem natkritičnog sušenja poboljšana vrednost specifične površine nosača i dobijena četiri puta veća vrednost zapremine mezopora.",
publisher = "Military Technical Institute, Belgrade",
journal = "Scientific Technical Review",
title = "Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support, Vozdejstvie suški v izbytke sverhkritičeskogo rastvoritelja na teksturnye harakteristiki nositelja katalizatora Ti-HMS / (francuski) Influence du séchage dans l'excès du solvant supercritique sur les caractéristiques texturales du support de catalyseur Ti-HMS), Uticaj sušenja u višku natkritičnog rastvarača na teksturalne karakteristike nosača katalizatora Ti-HMS",
pages = "28-21",
number = "1",
volume = "67",
doi = "10.5937/STR1701021P"
}

Prokić-Vidojević, D., Glišić, S.,& Orlović, A.. (2017). Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support. in Scientific Technical Review
Military Technical Institute, Belgrade., 67(1), 21-28.
https://doi.org/10.5937/STR1701021P

Prokić-Vidojević D, Glišić S, Orlović A. Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support. in Scientific Technical Review. 2017;67(1):21-28.
doi:10.5937/STR1701021P .

Prokić-Vidojević, Dragana, Glišić, Sandra, Orlović, Aleksandar, "Impact of supercritical drying with excess solvent on textural properties of Ti-HMS catalyst support" in Scientific Technical Review, 67, no. 1 (2017):21-28,
https://doi.org/10.5937/STR1701021P . .