TY  - JOUR
AU  - Đorđević, Biljana S.
AU  - Troter, Dragan Z.
AU  - Veljković, Vlada B.
AU  - Kijevčanin, Mirjana
AU  - Radović, Ivona
AU  - Todorović, Zoran B.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4427
AB  - Different deep eutectic solvents (DESs) of triethanolamine (TEOA) and oxalic acid (OA), glacial acetic acid (AA), L-(+)-lactic acid (LA), oleic acid (OLA), glycerol (G), ethylene glycol (EG), propylene glycol (PEG), choline chloride (ChCl) or 1,3-dimethylurea (DMU) were prepared and characterized regarding their physicochemical (density, viscosity, electrical conductivity, refractive index, coefficient of volume expansion, molecular volume, lattice energy and heat capacity) properties over the temperature range of 293.15-363.15 K at 101.325 kPa. For all tested DESs, the density, viscosity and refractive index decreased with rising temperature, while the electrical conductivity increased. The temperature dependence of viscosity and electrical conductivity are described by the Vogel-Tamman-Fulcher equations. The viscosity and molar conductivity, which exhibited a linear behaviour, were correlated by the fractional Walden rule. Besides, the Fourier transform infrared spectroscopy (FTIR) was used to study the functional groups of these DESs while thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) provided the information about their stability. The tested DESs of TEOA possess desirable properties for use in various industrial processes, such as extractions, separations, chemical technology and biotechnology.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component
EP  - 1315
IS  - 10
SP  - 1303
VL  - 85
DO  - 10.2298/JSC200425050D
ER  - 

@article{
author = "Đorđević, Biljana S. and Troter, Dragan Z. and Veljković, Vlada B. and Kijevčanin, Mirjana and Radović, Ivona and Todorović, Zoran B.",
year = "2020",
abstract = "Different deep eutectic solvents (DESs) of triethanolamine (TEOA) and oxalic acid (OA), glacial acetic acid (AA), L-(+)-lactic acid (LA), oleic acid (OLA), glycerol (G), ethylene glycol (EG), propylene glycol (PEG), choline chloride (ChCl) or 1,3-dimethylurea (DMU) were prepared and characterized regarding their physicochemical (density, viscosity, electrical conductivity, refractive index, coefficient of volume expansion, molecular volume, lattice energy and heat capacity) properties over the temperature range of 293.15-363.15 K at 101.325 kPa. For all tested DESs, the density, viscosity and refractive index decreased with rising temperature, while the electrical conductivity increased. The temperature dependence of viscosity and electrical conductivity are described by the Vogel-Tamman-Fulcher equations. The viscosity and molar conductivity, which exhibited a linear behaviour, were correlated by the fractional Walden rule. Besides, the Fourier transform infrared spectroscopy (FTIR) was used to study the functional groups of these DESs while thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) provided the information about their stability. The tested DESs of TEOA possess desirable properties for use in various industrial processes, such as extractions, separations, chemical technology and biotechnology.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component",
pages = "1315-1303",
number = "10",
volume = "85",
doi = "10.2298/JSC200425050D"
}

Đorđević, B. S., Troter, D. Z., Veljković, V. B., Kijevčanin, M., Radović, I.,& Todorović, Z. B.. (2020). The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 85(10), 1303-1315.
https://doi.org/10.2298/JSC200425050D

Đorđević BS, Troter DZ, Veljković VB, Kijevčanin M, Radović I, Todorović ZB. The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component. in Journal of the Serbian Chemical Society. 2020;85(10):1303-1315.
doi:10.2298/JSC200425050D .

Đorđević, Biljana S., Troter, Dragan Z., Veljković, Vlada B., Kijevčanin, Mirjana, Radović, Ivona, Todorović, Zoran B., "The physicochemical properties of the deep eutectic solvents with triethanolamine as a major component" in Journal of the Serbian Chemical Society, 85, no. 10 (2020):1303-1315,
https://doi.org/10.2298/JSC200425050D . .

TY  - JOUR
AU  - Pavlović, Stefan M.
AU  - Marinković, Dalibor
AU  - Kostić, Milan D.
AU  - Janković-Častvan, Ivona
AU  - Mojović, Ljiljana
AU  - Stanković, Miroslav
AU  - Veljković, Vlada B.
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4481
AB  - The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gis-mondine and the crystallographic modification of calcium silicate (alpha'-dicalcium silicate) with deposited CaO. The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry, N-2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity (97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the methanolysis reaction under the optimal reaction conditions (temperature of 60 degrees C, methanol/oil molar ratio of 6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory agreement between the experimental and predicted values of conversion degree (R-2  gt  0.93), confirming their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation energy calculated for both mechanisms were 67.17 and 58.03 kJ mol(-1), respectively.
PB  - Elsevier Sci Ltd, Oxford
T2  - Fuel
T1  - A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production
VL  - 267
DO  - 10.1016/j.fuel.2020.117171
ER  - 

@article{
author = "Pavlović, Stefan M. and Marinković, Dalibor and Kostić, Milan D. and Janković-Častvan, Ivona and Mojović, Ljiljana and Stanković, Miroslav and Veljković, Vlada B.",
year = "2020",
abstract = "The present paper is focused on the development of a new environment-friendly methanolysis catalyst completely based on waste materials: lignite coal fly ash and chicken eggshells. A novel catalyst based on CaO supported on a fly ash-based zeolitic material (CaO/FA-ZM) was obtained from a cancrinite-sodalite group zeolite-like material (vishnevite type) and active CaO by alkali activation in a new miniature autoclave reactor system and hydration-dehydration. Agitation by rotation of the entire reaction mixture led to a more homogeneous zeolitic product and saved both time and energy. The obtained catalyst structure corresponds to gis-mondine and the crystallographic modification of calcium silicate (alpha'-dicalcium silicate) with deposited CaO. The characteristics of the synthesized catalyst were determined using ED-XRF, XRD, FT-IR, SEM, Hg-porosimetry, N-2-physisorption, LDPSA, and Hammett indicators. The CaO/FA-ZM catalyst exhibited a high activity (97.8% of FAME for only 30 min) and stability (a negligible drop in activity in five consecutive cycles) in the methanolysis reaction under the optimal reaction conditions (temperature of 60 degrees C, methanol/oil molar ratio of 6:1, and catalyst concentration of 6 wt%). A kinetic study was performed using two different mechanisms: the irreversible pseudo-first-order reaction mechanism in two regimes (heterogeneous and homogeneous) and the changing mechanism combined with the triacylglycerol mass transfer limitation. Both models showed a satisfactory agreement between the experimental and predicted values of conversion degree (R-2  gt  0.93), confirming their validity for the CaO-based heterogeneously catalyzed methanolysis. The values of the activation energy calculated for both mechanisms were 67.17 and 58.03 kJ mol(-1), respectively.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Fuel",
title = "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production",
volume = "267",
doi = "10.1016/j.fuel.2020.117171"
}

Pavlović, S. M., Marinković, D., Kostić, M. D., Janković-Častvan, I., Mojović, L., Stanković, M.,& Veljković, V. B.. (2020). A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel
Elsevier Sci Ltd, Oxford., 267.
https://doi.org/10.1016/j.fuel.2020.117171

Pavlović SM, Marinković D, Kostić MD, Janković-Častvan I, Mojović L, Stanković M, Veljković VB. A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production. in Fuel. 2020;267.
doi:10.1016/j.fuel.2020.117171 .

Pavlović, Stefan M., Marinković, Dalibor, Kostić, Milan D., Janković-Častvan, Ivona, Mojović, Ljiljana, Stanković, Miroslav, Veljković, Vlada B., "A CaO/zeolite-based catalyst obtained from waste chicken eggshell and coal fly ash for biodiesel production" in Fuel, 267 (2020),
https://doi.org/10.1016/j.fuel.2020.117171 . .