TY  - CONF
AU  - Savić, Sanja
AU  - Panić, Vesna
AU  - Spasojević, Pavle
AU  - Pantić, Olga
AU  - Marković, Maja
AU  - Vicente, Filipa A.
AU  - Novak, Uroš
AU  - Likozar, Blaž
PY  - 2023
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/6868
AB  - The present study reports the development of the lab-scale procedure for extraction of pectin
from the waste industrial apple pomace using deep eutectic solvents (DES) as extraction medium.
Compared with conventional extraction solvents, DES have attracted considerable attention due
to the fact that they not only are eco-friendly, non-toxic, and biodegradable organic compounds

but also have a low cost, being easy to produce in the own laboratory. The research included a’

screening study that covered extraction using different DES based on choline chloride ([Ch]Cl) as
hydrogen bond acceptor (HBA), and organic acids as hydrogen bond donors (HBD). The applied
HBA:HBD molar ratio was 1:2. The pectin was extracted by employing solid-liquid (SLE) and
ultrasound assisted extraction (UAE). The DES based on [Ch]Cl and lactic acid turned to be most
promising in terms of obtained extraction yields, that reached 35% when applying UAE. It has
been shown that structure of HBD plays a major role with its hydrophilicity and hydrophobicity
influencing the number of established bonds. The HBD with lower amount of carbon molecules
and higher number of hydroxyl and carboxylic groups formed DES that are more efficient at
extracting pectin. Hidotopy study showed significant influence of water on pectin yield due to
more prominent hydrogen interaction established in the system. Depending on the type of DES,
the highest yields were obtained at 30-50 wt% of water, while an additional increase in water
content resulted in reduced yield. The structural properties of extracted pectin, including
esterification degree, was determined using FTIR spectroscopy.
PB  - University of North Texas
C3  - Book of Abstracts / 29thPolyChar - World Forum on Advanced Materials, 26 - 29 September 2023, Nice, France
T1  - PERSPECTIVES OF DEEP EUTECTIC SOLVENTS FOR EXTRACTION OF PECTIN FROM WASTE APPLE POMACE
SP  - 54
UR  - https://hdl.handle.net/21.15107/rcub_technorep_6868
ER  - 

@conference{
author = "Savić, Sanja and Panić, Vesna and Spasojević, Pavle and Pantić, Olga and Marković, Maja and Vicente, Filipa A. and Novak, Uroš and Likozar, Blaž",
year = "2023",
abstract = "The present study reports the development of the lab-scale procedure for extraction of pectin
from the waste industrial apple pomace using deep eutectic solvents (DES) as extraction medium.
Compared with conventional extraction solvents, DES have attracted considerable attention due
to the fact that they not only are eco-friendly, non-toxic, and biodegradable organic compounds

but also have a low cost, being easy to produce in the own laboratory. The research included a’

screening study that covered extraction using different DES based on choline chloride ([Ch]Cl) as
hydrogen bond acceptor (HBA), and organic acids as hydrogen bond donors (HBD). The applied
HBA:HBD molar ratio was 1:2. The pectin was extracted by employing solid-liquid (SLE) and
ultrasound assisted extraction (UAE). The DES based on [Ch]Cl and lactic acid turned to be most
promising in terms of obtained extraction yields, that reached 35% when applying UAE. It has
been shown that structure of HBD plays a major role with its hydrophilicity and hydrophobicity
influencing the number of established bonds. The HBD with lower amount of carbon molecules
and higher number of hydroxyl and carboxylic groups formed DES that are more efficient at
extracting pectin. Hidotopy study showed significant influence of water on pectin yield due to
more prominent hydrogen interaction established in the system. Depending on the type of DES,
the highest yields were obtained at 30-50 wt% of water, while an additional increase in water
content resulted in reduced yield. The structural properties of extracted pectin, including
esterification degree, was determined using FTIR spectroscopy.",
publisher = "University of North Texas",
journal = "Book of Abstracts / 29thPolyChar - World Forum on Advanced Materials, 26 - 29 September 2023, Nice, France",
title = "PERSPECTIVES OF DEEP EUTECTIC SOLVENTS FOR EXTRACTION OF PECTIN FROM WASTE APPLE POMACE",
pages = "54",
url = "https://hdl.handle.net/21.15107/rcub_technorep_6868"
}

Savić, S., Panić, V., Spasojević, P., Pantić, O., Marković, M., Vicente, F. A., Novak, U.,& Likozar, B.. (2023). PERSPECTIVES OF DEEP EUTECTIC SOLVENTS FOR EXTRACTION OF PECTIN FROM WASTE APPLE POMACE. in Book of Abstracts / 29thPolyChar - World Forum on Advanced Materials, 26 - 29 September 2023, Nice, France
University of North Texas., 54.
https://hdl.handle.net/21.15107/rcub_technorep_6868

Savić S, Panić V, Spasojević P, Pantić O, Marković M, Vicente FA, Novak U, Likozar B. PERSPECTIVES OF DEEP EUTECTIC SOLVENTS FOR EXTRACTION OF PECTIN FROM WASTE APPLE POMACE. in Book of Abstracts / 29thPolyChar - World Forum on Advanced Materials, 26 - 29 September 2023, Nice, France. 2023;:54.
https://hdl.handle.net/21.15107/rcub_technorep_6868 .

Savić, Sanja, Panić, Vesna, Spasojević, Pavle, Pantić, Olga, Marković, Maja, Vicente, Filipa A., Novak, Uroš, Likozar, Blaž, "PERSPECTIVES OF DEEP EUTECTIC SOLVENTS FOR EXTRACTION OF PECTIN FROM WASTE APPLE POMACE" in Book of Abstracts / 29thPolyChar - World Forum on Advanced Materials, 26 - 29 September 2023, Nice, France (2023):54,
https://hdl.handle.net/21.15107/rcub_technorep_6868 .

TY  - JOUR
AU  - Živković, Luka
AU  - Pohar, Andrej
AU  - Likozar, Blaž
AU  - Nikačević, Nikola
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4341
AB  - In this feasibility study, a novel industrial-scale reactor structure for continuous hydrogen production via intensified water-gas shift (WGS) reaction is proposed. It considers both trickling calcium-oxide sorbent for carbon dioxide removal (SOR) and Pd-based membrane for hydrogen separation (MEM). It is shown that WGS, SOR, MEM, and cooling can be decoupled with a special reactor superstructure mathematically represented with the pseudo-homogenous one-dimensional model. The final reactor structure and operating conditions are determined by using rigorous multi-objective optimization. Two objective functions take all main costs into account (total reactor volume and respective volumetric fractions for the catalyst, sorbent, and membrane) and the main benefit (hydrogen yield). The results show that the best cost-benefit relation can be achieved with the two-module reactor and combined WGS and SOR processes, with 95% carbon monoxide conversion (64% higher than the equilibrium conversion at the same conditions) and the outlet-stream containing only 0.7% of carbon dioxide.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Chemical Engineering Science
T1  - Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction
VL  - 211
DO  - 10.1016/j.ces.2019.115174
ER  - 

@article{
author = "Živković, Luka and Pohar, Andrej and Likozar, Blaž and Nikačević, Nikola",
year = "2020",
abstract = "In this feasibility study, a novel industrial-scale reactor structure for continuous hydrogen production via intensified water-gas shift (WGS) reaction is proposed. It considers both trickling calcium-oxide sorbent for carbon dioxide removal (SOR) and Pd-based membrane for hydrogen separation (MEM). It is shown that WGS, SOR, MEM, and cooling can be decoupled with a special reactor superstructure mathematically represented with the pseudo-homogenous one-dimensional model. The final reactor structure and operating conditions are determined by using rigorous multi-objective optimization. Two objective functions take all main costs into account (total reactor volume and respective volumetric fractions for the catalyst, sorbent, and membrane) and the main benefit (hydrogen yield). The results show that the best cost-benefit relation can be achieved with the two-module reactor and combined WGS and SOR processes, with 95% carbon monoxide conversion (64% higher than the equilibrium conversion at the same conditions) and the outlet-stream containing only 0.7% of carbon dioxide.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Chemical Engineering Science",
title = "Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction",
volume = "211",
doi = "10.1016/j.ces.2019.115174"
}

Živković, L., Pohar, A., Likozar, B.,& Nikačević, N.. (2020). Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction. in Chemical Engineering Science
Pergamon-Elsevier Science Ltd, Oxford., 211.
https://doi.org/10.1016/j.ces.2019.115174

Živković L, Pohar A, Likozar B, Nikačević N. Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction. in Chemical Engineering Science. 2020;211.
doi:10.1016/j.ces.2019.115174 .

Živković, Luka, Pohar, Andrej, Likozar, Blaž, Nikačević, Nikola, "Reactor conceptual design by optimization for hydrogen production through intensified sorption- and membrane-enhanced water-gas shift reaction" in Chemical Engineering Science, 211 (2020),
https://doi.org/10.1016/j.ces.2019.115174 . .

TY  - JOUR
AU  - Bjelajac, Anđelika
AU  - Kopac, Drejc
AU  - Fecant, Antoine
AU  - Tavernier, Eugenie
AU  - Petrović, Rada
AU  - Likozar, Blaž
AU  - Janaćković, Đorđe
PY  - 2020
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4466
AB  - CO2 photoreduction is studied using in-house synthesized undoped and N-doped TiO2 nanoparticle photocatalysts. Comparison with the commercial P25 TiO2 powder shows that the synthesized samples are more effective. P25 produced a negligible amount of CH4, unlike the synthesized samples. N-doping of TiO2 powder caused a higher productivity rate of all products, and provided the best performance for CO2 reduction. The average production rate of CH4 was 0.191 mu mol h(-1) g(-1), whereas that of CO was 0.111 mu mol h(-1) g(-1). The experimental data are used to fit the micro-kinetic modelling parameters. The kinetic constant of H2O dissociation is the lowest for all tested samples, revealing that this is the rate-determining step. The kinetic constants for the H-2, CO, and CH4 formation were of the same order for all catalyst samples, showing that the rates of these reactions are independent of the catalyst type.
PB  - Royal Soc Chemistry, Cambridge
T2  - Catalysis Science & Technology
T1  - Micro-kinetic modelling of photocatalytic CO2 reduction over undoped and N-doped TiO2
EP  - 1698
IS  - 6
SP  - 1688
VL  - 10
DO  - 10.1039/c9cy02443c
ER  - 

@article{
author = "Bjelajac, Anđelika and Kopac, Drejc and Fecant, Antoine and Tavernier, Eugenie and Petrović, Rada and Likozar, Blaž and Janaćković, Đorđe",
year = "2020",
abstract = "CO2 photoreduction is studied using in-house synthesized undoped and N-doped TiO2 nanoparticle photocatalysts. Comparison with the commercial P25 TiO2 powder shows that the synthesized samples are more effective. P25 produced a negligible amount of CH4, unlike the synthesized samples. N-doping of TiO2 powder caused a higher productivity rate of all products, and provided the best performance for CO2 reduction. The average production rate of CH4 was 0.191 mu mol h(-1) g(-1), whereas that of CO was 0.111 mu mol h(-1) g(-1). The experimental data are used to fit the micro-kinetic modelling parameters. The kinetic constant of H2O dissociation is the lowest for all tested samples, revealing that this is the rate-determining step. The kinetic constants for the H-2, CO, and CH4 formation were of the same order for all catalyst samples, showing that the rates of these reactions are independent of the catalyst type.",
publisher = "Royal Soc Chemistry, Cambridge",
journal = "Catalysis Science & Technology",
title = "Micro-kinetic modelling of photocatalytic CO2 reduction over undoped and N-doped TiO2",
pages = "1698-1688",
number = "6",
volume = "10",
doi = "10.1039/c9cy02443c"
}

Bjelajac, A., Kopac, D., Fecant, A., Tavernier, E., Petrović, R., Likozar, B.,& Janaćković, Đ.. (2020). Micro-kinetic modelling of photocatalytic CO2 reduction over undoped and N-doped TiO2. in Catalysis Science & Technology
Royal Soc Chemistry, Cambridge., 10(6), 1688-1698.
https://doi.org/10.1039/c9cy02443c

Bjelajac A, Kopac D, Fecant A, Tavernier E, Petrović R, Likozar B, Janaćković Đ. Micro-kinetic modelling of photocatalytic CO2 reduction over undoped and N-doped TiO2. in Catalysis Science & Technology. 2020;10(6):1688-1698.
doi:10.1039/c9cy02443c .

Bjelajac, Anđelika, Kopac, Drejc, Fecant, Antoine, Tavernier, Eugenie, Petrović, Rada, Likozar, Blaž, Janaćković, Đorđe, "Micro-kinetic modelling of photocatalytic CO2 reduction over undoped and N-doped TiO2" in Catalysis Science & Technology, 10, no. 6 (2020):1688-1698,
https://doi.org/10.1039/c9cy02443c . .

TY  - JOUR
AU  - Živković, Luka
AU  - Pohar, Andrej
AU  - Likozar, Blaž
AU  - Nikačević, Nikola
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3346
AB  - Hydrogen, an important energy carrier of the future, produces no pollution and has a high content of energy. It is formed as a direct product of the water-gas shift (WGS) reaction, which occurs in various processes for the production of hydrogen, ammonia, methanol and different hydrocarbons, and is also a side reaction during the steam reforming of hydrocarbons and Fisher-Tropsch synthesis. Since it is an equilibrium reaction, it may be intensified by the selective removal of the products, which can lead to higher yields and energy savings. In this study, carbon dioxide was removed through chemisorption on CaO particles. In the first part, the WGS reaction kinetics were obtained on an industrial iron chromium catalyst in a packed-bed reactor. In the second part, the CO2 chemisorption kinetics on CaO sorbent particles were examined, simultaneously with the WGS reaction. A modified dynamic shrinking-core model was used to describe the carbonation reaction, which accounted for the non ideal core shrinkage. With the introduction of a sorbent conversion-dependent effective diffusion coefficient, the model perfectly reproduced the obtained experimental results. Valuable insight into the sorption-enhanced process was obtained with the full concentration profiles of the species involved (CO, H2O, CO2, H-2) in time and space, as well as the conversion of the sorbent particles, also in the radial dimension. The developed model was used to simulate a cyclic sorption-enhanced water-gas shift operation in a revolver-type manner which allows for continuous sorbent regeneration and a much higher than-equilibrium hydrogen production for various operational parameters. The significance of the model lies in the precise replication of the experimental results and its applicability to the vast area of the newly-emerged industrial sorption-enhanced technologies.
PB  - Elsevier Sci Ltd, Oxford
T2  - Applied Energy
T1  - Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production
EP  - 855
SP  - 844
VL  - 178
DO  - 10.1016/j.apenergy.2016.06.071
ER  - 

@article{
author = "Živković, Luka and Pohar, Andrej and Likozar, Blaž and Nikačević, Nikola",
year = "2016",
abstract = "Hydrogen, an important energy carrier of the future, produces no pollution and has a high content of energy. It is formed as a direct product of the water-gas shift (WGS) reaction, which occurs in various processes for the production of hydrogen, ammonia, methanol and different hydrocarbons, and is also a side reaction during the steam reforming of hydrocarbons and Fisher-Tropsch synthesis. Since it is an equilibrium reaction, it may be intensified by the selective removal of the products, which can lead to higher yields and energy savings. In this study, carbon dioxide was removed through chemisorption on CaO particles. In the first part, the WGS reaction kinetics were obtained on an industrial iron chromium catalyst in a packed-bed reactor. In the second part, the CO2 chemisorption kinetics on CaO sorbent particles were examined, simultaneously with the WGS reaction. A modified dynamic shrinking-core model was used to describe the carbonation reaction, which accounted for the non ideal core shrinkage. With the introduction of a sorbent conversion-dependent effective diffusion coefficient, the model perfectly reproduced the obtained experimental results. Valuable insight into the sorption-enhanced process was obtained with the full concentration profiles of the species involved (CO, H2O, CO2, H-2) in time and space, as well as the conversion of the sorbent particles, also in the radial dimension. The developed model was used to simulate a cyclic sorption-enhanced water-gas shift operation in a revolver-type manner which allows for continuous sorbent regeneration and a much higher than-equilibrium hydrogen production for various operational parameters. The significance of the model lies in the precise replication of the experimental results and its applicability to the vast area of the newly-emerged industrial sorption-enhanced technologies.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Applied Energy",
title = "Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production",
pages = "855-844",
volume = "178",
doi = "10.1016/j.apenergy.2016.06.071"
}

Živković, L., Pohar, A., Likozar, B.,& Nikačević, N.. (2016). Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production. in Applied Energy
Elsevier Sci Ltd, Oxford., 178, 844-855.
https://doi.org/10.1016/j.apenergy.2016.06.071

Živković L, Pohar A, Likozar B, Nikačević N. Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production. in Applied Energy. 2016;178:844-855.
doi:10.1016/j.apenergy.2016.06.071 .

Živković, Luka, Pohar, Andrej, Likozar, Blaž, Nikačević, Nikola, "Kinetics and reactor modeling for CaO sorption-enhanced high-temperature water-gas shift (SE-WGS) reaction for hydrogen production" in Applied Energy, 178 (2016):844-855,
https://doi.org/10.1016/j.apenergy.2016.06.071 . .