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  - 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 . .