TY  - JOUR
AU  - Ivanović, Marija
AU  - Nenadović, Snežana S.
AU  - Pavlović, Vera P.
AU  - Radović, Ivona
AU  - Kijevčanin, Mirjana
AU  - Pavlović, Vladimir B.
AU  - Kljajević, Ljiljana
PY  - 2021
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/3566
AB  - Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.
PB  - Soc Chemists Technologists Madeconia, Skopje
T2  - Macedonian Journal of Chemistry and Chemical Engineering
T1  - The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers
EP  - 117
IS  - 1
SP  - 107
VL  - 40
DO  - 10.20450/mjcce.2021.2127
ER  - 

@article{
author = "Ivanović, Marija and Nenadović, Snežana S. and Pavlović, Vera P. and Radović, Ivona and Kijevčanin, Mirjana and Pavlović, Vladimir B. and Kljajević, Ljiljana",
year = "2021",
abstract = "Thermodynamic parameters (densities, viscosities, speed of sound, and refractive index) of four series of alkaline activators were determined over the temperature range from 15 to 60 degrees C for the process of geopolymerization. Mixtures of Na2SiO3 and NaOH of different molar concentrations ( from 2M to 8M with step 2) were used as an alkaline activator. The sample with the highest NaOH concentration also shows the highest values of all thermodynamic parameters. Metakaolin, obtained by calcination of kaolin at 750 degrees C, was used as the starting material. The samples were characterized by X-ray diffraction (XRD), FTIR and Raman spectroscopy, Scanning Electron Microscopy (SEM), and Energy-Dispersive X-Ray (EDX) Spectroscopy. Results of FTIR analysis correlated with results of Raman Spectroscopy. Due to the polymerization process, the changes in the phonon spectrum were confirmed. The different concentrations of activators do not notably change the Si/Al ratio.",
publisher = "Soc Chemists Technologists Madeconia, Skopje",
journal = "Macedonian Journal of Chemistry and Chemical Engineering",
title = "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers",
pages = "117-107",
number = "1",
volume = "40",
doi = "10.20450/mjcce.2021.2127"
}

Ivanović, M., Nenadović, S. S., Pavlović, V. P., Radović, I., Kijevčanin, M., Pavlović, V. B.,& Kljajević, L.. (2021). The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering
Soc Chemists Technologists Madeconia, Skopje., 40(1), 107-117.
https://doi.org/10.20450/mjcce.2021.2127

Ivanović M, Nenadović SS, Pavlović VP, Radović I, Kijevčanin M, Pavlović VB, Kljajević L. The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers. in Macedonian Journal of Chemistry and Chemical Engineering. 2021;40(1):107-117.
doi:10.20450/mjcce.2021.2127 .

Ivanović, Marija, Nenadović, Snežana S., Pavlović, Vera P., Radović, Ivona, Kijevčanin, Mirjana, Pavlović, Vladimir B., Kljajević, Ljiljana, "The influence of thermodynamic parameters on alkaline activators of geopolymers and the structure of geopolymers" in Macedonian Journal of Chemistry and Chemical Engineering, 40, no. 1 (2021):107-117,
https://doi.org/10.20450/mjcce.2021.2127 . .

TY  - JOUR
AU  - Majstorović, Divna M.
AU  - Zivković, Emila M.
AU  - Matija, Lidija
AU  - Kijevčanin, Mirjana
PY  - 2017
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2651
AB  - Density, viscosity and refractive index of four binary mixtures consisting of diethyl succinate or ethyl octanoate + 2-methyl-1-propanol or 3-methyl-1-butanol have been measured at atmospheric pressure and over the temperature range from 288.15 K to 323.15 K. Excess and deviation functions have been calculated from these data and fitted to the Redlich-Kister equation. The values of excess molar volume and deviation functions, with FT-IR study, were further used in the analysis of molecular interactions present in the mixture as well as the temperature influence on them. Molar excess Gibbs free energies of activation of viscous flow were additionally calculated from measured density and viscosity data for better understanding of present molecular interactions. Viscosity modelling was done with two approaches, predictive by group contribution models (UNIFAC-VISCO and ASOG-VISCO), and correlative by one to three-parameter models (Teja-Rice, Grunberg-Nissan, McAlister, Eyring-UNIQUAC and Eyring-NRTL). The obtained results were compared with experimental data and conclusions about applied approaches and models were made.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Chemical Thermodynamics
T1  - Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate plus isobutanol, or isopentanol) at varying temperatures
EP  - 188
SP  - 169
VL  - 104
DO  - 10.1016/j.jct.2016.09.030
ER  - 

@article{
author = "Majstorović, Divna M. and Zivković, Emila M. and Matija, Lidija and Kijevčanin, Mirjana",
year = "2017",
abstract = "Density, viscosity and refractive index of four binary mixtures consisting of diethyl succinate or ethyl octanoate + 2-methyl-1-propanol or 3-methyl-1-butanol have been measured at atmospheric pressure and over the temperature range from 288.15 K to 323.15 K. Excess and deviation functions have been calculated from these data and fitted to the Redlich-Kister equation. The values of excess molar volume and deviation functions, with FT-IR study, were further used in the analysis of molecular interactions present in the mixture as well as the temperature influence on them. Molar excess Gibbs free energies of activation of viscous flow were additionally calculated from measured density and viscosity data for better understanding of present molecular interactions. Viscosity modelling was done with two approaches, predictive by group contribution models (UNIFAC-VISCO and ASOG-VISCO), and correlative by one to three-parameter models (Teja-Rice, Grunberg-Nissan, McAlister, Eyring-UNIQUAC and Eyring-NRTL). The obtained results were compared with experimental data and conclusions about applied approaches and models were made.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Chemical Thermodynamics",
title = "Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate plus isobutanol, or isopentanol) at varying temperatures",
pages = "188-169",
volume = "104",
doi = "10.1016/j.jct.2016.09.030"
}

Majstorović, D. M., Zivković, E. M., Matija, L.,& Kijevčanin, M.. (2017). Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate plus isobutanol, or isopentanol) at varying temperatures. in Journal of Chemical Thermodynamics
Academic Press Ltd- Elsevier Science Ltd, London., 104, 169-188.
https://doi.org/10.1016/j.jct.2016.09.030

Majstorović DM, Zivković EM, Matija L, Kijevčanin M. Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate plus isobutanol, or isopentanol) at varying temperatures. in Journal of Chemical Thermodynamics. 2017;104:169-188.
doi:10.1016/j.jct.2016.09.030 .

Majstorović, Divna M., Zivković, Emila M., Matija, Lidija, Kijevčanin, Mirjana, "Volumetric, viscometric, spectral studies and viscosity modelling of binary mixtures of esters and alcohols (diethyl succinate, or ethyl octanoate plus isobutanol, or isopentanol) at varying temperatures" in Journal of Chemical Thermodynamics, 104 (2017):169-188,
https://doi.org/10.1016/j.jct.2016.09.030 . .

TY  - JOUR
AU  - Vukadinović, Bojana
AU  - Popović, Ivanka
AU  - Dunjić, Branko
AU  - Jovović, Aleksandar
AU  - Vlajić, Miloš
AU  - Stanković, Dejan
AU  - Bajić, Zoran
AU  - Kijevčanin, Mirjana
PY  - 2016
UR  - https://machinery.mas.bg.ac.rs/handle/123456789/2474
AB  - Electricity generation using carbon-based fuels is responsible for a large fraction of carbon dioxide emissions worldwide. In Serbia, 70% of the electricity is produced from coal-fired power plants. The aim of this investigation was to identify the retrofitting opportunities to reduce the carbon intensity of power generation. Resource Efficient and Cleaner Production assessment was performed in a coal thermal power plant of the public company "Thermal Power Plants Nikola Tesla", which operates within the Electric Power Industry of Serbia. Assessment of the thermal power plant operation was supported by experimentally measured data (fresh water pressures and temperatures, steam temperatures and pressures, condensing pressure, water flowrate, make-up water flowrate, steam flowrate, coal composition, emissions, etc), emission factor determinations and by using data obtained during unit balancing and simulation of the system's performance. The data collected and analyzed during power plant operation were used for the development of a new general approach with comprehensive analysis of the system, using the following plant eco-efficiency indicators: energy consumption, climate change, acidification, and waste generation. Indicators were used to present decoupling after implementation of the described measures. The analysis of two units showed that the nominal power could be increased by 60 MWe, with an increase of the unit gross efficiency of 0.4%, and a reduction of coal, water and electricity consumption. The implementation of RECP measures in this study enabled analysis of the overall performance of the system as evidenced by the eco-efficiency indicators: energy consumption (decreased by 3%), CO2 emission (decreased by 3%), and SO2 emission (decreased by 39%). Consequently, it may be concluded that the proposed RECP approach, tested on thermal power plants, and presented as eco-efficiency indicators show that the described methodology may be successfully implemented in the energy sector and for the improvement in power plants.
PB  - Elsevier Sci Ltd, Oxford
T2  - Journal of Cleaner Production
T1  - Correlation between eco-efficiency measures and resource and impact decoupling for thermal power plants in Serbia
EP  - 274
SP  - 264
VL  - 138
DO  - 10.1016/j.jclepro.2016.05.060
ER  - 

@article{
author = "Vukadinović, Bojana and Popović, Ivanka and Dunjić, Branko and Jovović, Aleksandar and Vlajić, Miloš and Stanković, Dejan and Bajić, Zoran and Kijevčanin, Mirjana",
year = "2016",
abstract = "Electricity generation using carbon-based fuels is responsible for a large fraction of carbon dioxide emissions worldwide. In Serbia, 70% of the electricity is produced from coal-fired power plants. The aim of this investigation was to identify the retrofitting opportunities to reduce the carbon intensity of power generation. Resource Efficient and Cleaner Production assessment was performed in a coal thermal power plant of the public company "Thermal Power Plants Nikola Tesla", which operates within the Electric Power Industry of Serbia. Assessment of the thermal power plant operation was supported by experimentally measured data (fresh water pressures and temperatures, steam temperatures and pressures, condensing pressure, water flowrate, make-up water flowrate, steam flowrate, coal composition, emissions, etc), emission factor determinations and by using data obtained during unit balancing and simulation of the system's performance. The data collected and analyzed during power plant operation were used for the development of a new general approach with comprehensive analysis of the system, using the following plant eco-efficiency indicators: energy consumption, climate change, acidification, and waste generation. Indicators were used to present decoupling after implementation of the described measures. The analysis of two units showed that the nominal power could be increased by 60 MWe, with an increase of the unit gross efficiency of 0.4%, and a reduction of coal, water and electricity consumption. The implementation of RECP measures in this study enabled analysis of the overall performance of the system as evidenced by the eco-efficiency indicators: energy consumption (decreased by 3%), CO2 emission (decreased by 3%), and SO2 emission (decreased by 39%). Consequently, it may be concluded that the proposed RECP approach, tested on thermal power plants, and presented as eco-efficiency indicators show that the described methodology may be successfully implemented in the energy sector and for the improvement in power plants.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Journal of Cleaner Production",
title = "Correlation between eco-efficiency measures and resource and impact decoupling for thermal power plants in Serbia",
pages = "274-264",
volume = "138",
doi = "10.1016/j.jclepro.2016.05.060"
}

Vukadinović, B., Popović, I., Dunjić, B., Jovović, A., Vlajić, M., Stanković, D., Bajić, Z.,& Kijevčanin, M.. (2016). Correlation between eco-efficiency measures and resource and impact decoupling for thermal power plants in Serbia. in Journal of Cleaner Production
Elsevier Sci Ltd, Oxford., 138, 264-274.
https://doi.org/10.1016/j.jclepro.2016.05.060

Vukadinović B, Popović I, Dunjić B, Jovović A, Vlajić M, Stanković D, Bajić Z, Kijevčanin M. Correlation between eco-efficiency measures and resource and impact decoupling for thermal power plants in Serbia. in Journal of Cleaner Production. 2016;138:264-274.
doi:10.1016/j.jclepro.2016.05.060 .

Vukadinović, Bojana, Popović, Ivanka, Dunjić, Branko, Jovović, Aleksandar, Vlajić, Miloš, Stanković, Dejan, Bajić, Zoran, Kijevčanin, Mirjana, "Correlation between eco-efficiency measures and resource and impact decoupling for thermal power plants in Serbia" in Journal of Cleaner Production, 138 (2016):264-274,
https://doi.org/10.1016/j.jclepro.2016.05.060 . .