TY  - CONF
AU  - Marinković, Dalibor
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Seidel-Morgenstern, Andreas
AU  - Kienle, Achim
AU  - Petkovska, Menka
PY  - 2024
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/7522
AB  - The continuous industrial chemical processes are typically designed through steady-state conditions. Nevertheless, there is evidence that processes can be intensified by applying optimized forced periodic operation. Possible improvements in reactor performances caused by the implementation of forced periodic operation (FPO) can be successfully evaluated by applying a nonlinear frequency response (NFR) analysis, before experimental investigation. In this study, we will present the results of two case studies based on heterogeneously catalyzed methanol synthesis in a continuous stirred tank reactor (CSTR). The first is an isothermal case, and the second is a more complicated and more realistic, non-isothermal case.
PB  - Stockholm, Sweden : Scanditale AB
C3  - Energy Proceedings
T1  - Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis
VL  - 43
IS  - VI
DO  - 10.46855/energy-proceedings-11025
ER  - 

@conference{
author = "Marinković, Dalibor and Nikolić, Daliborka and Seidel, Carsten and Seidel-Morgenstern, Andreas and Kienle, Achim and Petkovska, Menka",
year = "2024",
abstract = "The continuous industrial chemical processes are typically designed through steady-state conditions. Nevertheless, there is evidence that processes can be intensified by applying optimized forced periodic operation. Possible improvements in reactor performances caused by the implementation of forced periodic operation (FPO) can be successfully evaluated by applying a nonlinear frequency response (NFR) analysis, before experimental investigation. In this study, we will present the results of two case studies based on heterogeneously catalyzed methanol synthesis in a continuous stirred tank reactor (CSTR). The first is an isothermal case, and the second is a more complicated and more realistic, non-isothermal case.",
publisher = "Stockholm, Sweden : Scanditale AB",
journal = "Energy Proceedings",
title = "Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis",
volume = "43",
number = "VI",
doi = "10.46855/energy-proceedings-11025"
}

Marinković, D., Nikolić, D., Seidel, C., Seidel-Morgenstern, A., Kienle, A.,& Petkovska, M.. (2024). Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis. in Energy Proceedings
Stockholm, Sweden : Scanditale AB., 43(VI).
https://doi.org/10.46855/energy-proceedings-11025

Marinković D, Nikolić D, Seidel C, Seidel-Morgenstern A, Kienle A, Petkovska M. Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis. in Energy Proceedings. 2024;43(VI).
doi:10.46855/energy-proceedings-11025 .

Marinković, Dalibor, Nikolić, Daliborka, Seidel, Carsten, Seidel-Morgenstern, Andreas, Kienle, Achim, Petkovska, Menka, "Evaluation of possible improvements of forced periodically operated reactor in which methanol synthesis takes place – based on the Nonlinear Frequency Response analysis" in Energy Proceedings, 43, no. VI (2024),
https://doi.org/10.46855/energy-proceedings-11025 . .

TY  - JOUR
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Miličić, Tamara
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4813
AB  - In this two-part paper a comprehensive study of the potential to improve performance criteria of a methanol synthesis reactor through forced periodical operations is presented. The study uses the Nonlinear Frequency Response method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance. To demonstrate the method, isothermal and isobaric methanol synthesis in a lab-scale CSTR is considered. In Part I, the analysis is performed for single input modulations. Partial pressures of each reactant in the feed stream and the total inlet volumetric flow-rate are considered as possible modulated inputs. The results show that modulations of single inputs essentially do not provide potential for significant improvements. In Part II, the study will be extended to analysis of periodic operations with simultaneous modulations of two inputs and conditions offering significant performance enhancements will be identified.
PB  - Elsevier
T2  - Chemical Engineering Science
T1  - Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations
VL  - 248
SP  - 117134
DO  - 10.1016/j.ces.2021.117134
ER  - 

@article{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Miličić, Tamara and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "In this two-part paper a comprehensive study of the potential to improve performance criteria of a methanol synthesis reactor through forced periodical operations is presented. The study uses the Nonlinear Frequency Response method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance. To demonstrate the method, isothermal and isobaric methanol synthesis in a lab-scale CSTR is considered. In Part I, the analysis is performed for single input modulations. Partial pressures of each reactant in the feed stream and the total inlet volumetric flow-rate are considered as possible modulated inputs. The results show that modulations of single inputs essentially do not provide potential for significant improvements. In Part II, the study will be extended to analysis of periodic operations with simultaneous modulations of two inputs and conditions offering significant performance enhancements will be identified.",
publisher = "Elsevier",
journal = "Chemical Engineering Science",
title = "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations",
volume = "248",
pages = "117134",
doi = "10.1016/j.ces.2021.117134"
}

Nikolić, D., Seidel, C., Felischak, M., Miličić, T., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations. in Chemical Engineering Science
Elsevier., 248, 117134.
https://doi.org/10.1016/j.ces.2021.117134

Nikolić D, Seidel C, Felischak M, Miličić T, Kienle A, Seidel-Morgenstern A, Petkovska M. Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations. in Chemical Engineering Science. 2022;248:117134.
doi:10.1016/j.ces.2021.117134 .

Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Miličić, Tamara, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations" in Chemical Engineering Science, 248 (2022):117134,
https://doi.org/10.1016/j.ces.2021.117134 . .

TY  - JOUR
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Miličić, Tamara
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4816
AB  - The analysis of the potential to improve performance of a methanol synthesis reactor through forced periodical operations by Nonlinear Frequency Response method is presented. The methanol synthesis in an isothermal and isobaric lab-scale CSTR is considered. First, the analysis was performed for single input modulations (in Part I), which showed that significant improvements can't be achieved. Here, the study is extended to analysis of simultaneous modulations of two inputs. All possible input combinations (6 cases) are analysed and the optimal forcing parameters, maximizing the time-average methanol production, were determined. For all combinations the improvement is possible, but for some cases it is not significant. The highest improvement is predicted for simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate. This case, for which it is possible to achieve up to 33.51 % of methanol production, is analysed it detail and optimized using multi-objective optimization.
PB  - Elsevier
T2  - Chemical Engineering Science
T1  - Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs
VL  - 248
SP  - 117133
DO  - 10.1016/j.ces.2021.117133
ER  - 

@article{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Miličić, Tamara and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "The analysis of the potential to improve performance of a methanol synthesis reactor through forced periodical operations by Nonlinear Frequency Response method is presented. The methanol synthesis in an isothermal and isobaric lab-scale CSTR is considered. First, the analysis was performed for single input modulations (in Part I), which showed that significant improvements can't be achieved. Here, the study is extended to analysis of simultaneous modulations of two inputs. All possible input combinations (6 cases) are analysed and the optimal forcing parameters, maximizing the time-average methanol production, were determined. For all combinations the improvement is possible, but for some cases it is not significant. The highest improvement is predicted for simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate. This case, for which it is possible to achieve up to 33.51 % of methanol production, is analysed it detail and optimized using multi-objective optimization.",
publisher = "Elsevier",
journal = "Chemical Engineering Science",
title = "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs",
volume = "248",
pages = "117133",
doi = "10.1016/j.ces.2021.117133"
}

Nikolić, D., Seidel, C., Felischak, M., Miličić, T., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs. in Chemical Engineering Science
Elsevier., 248, 117133.
https://doi.org/10.1016/j.ces.2021.117133

Nikolić D, Seidel C, Felischak M, Miličić T, Kienle A, Seidel-Morgenstern A, Petkovska M. Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs. in Chemical Engineering Science. 2022;248:117133.
doi:10.1016/j.ces.2021.117133 .

Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Miličić, Tamara, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs" in Chemical Engineering Science, 248 (2022):117133,
https://doi.org/10.1016/j.ces.2021.117133 . .

TY  - JOUR
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Miličić, Tamara
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4819
AB  - In this two-part paper a comprehensive study of the potential to improve performance criteria of a methanol synthesis reactor through forced periodical operations is presented. The study uses the Nonlinear Frequency Response method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance. To demonstrate the method, isothermal and isobaric methanol synthesis in a lab-scale CSTR is considered. In Part I, the analysis is performed for single input modulations. Partial pressures of each reactant in the feed stream and the total inlet volumetric flow-rate are considered as possible modulated inputs. The results show that modulations of single inputs essentially do not provide potential for significant improvements. In Part II, the study will be extended to analysis of periodic operations with simultaneous modulations of two inputs and conditions offering significant performance enhancements will be identified.
PB  - Elsevier
T2  - Chemical Engineering Science
T1  - Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations
VL  - 248
SP  - 117134
DO  - 10.1016/j.ces.2021.117134
ER  - 

@article{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Miličić, Tamara and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "In this two-part paper a comprehensive study of the potential to improve performance criteria of a methanol synthesis reactor through forced periodical operations is presented. The study uses the Nonlinear Frequency Response method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance. To demonstrate the method, isothermal and isobaric methanol synthesis in a lab-scale CSTR is considered. In Part I, the analysis is performed for single input modulations. Partial pressures of each reactant in the feed stream and the total inlet volumetric flow-rate are considered as possible modulated inputs. The results show that modulations of single inputs essentially do not provide potential for significant improvements. In Part II, the study will be extended to analysis of periodic operations with simultaneous modulations of two inputs and conditions offering significant performance enhancements will be identified.",
publisher = "Elsevier",
journal = "Chemical Engineering Science",
title = "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations",
volume = "248",
pages = "117134",
doi = "10.1016/j.ces.2021.117134"
}

Nikolić, D., Seidel, C., Felischak, M., Miličić, T., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations. in Chemical Engineering Science
Elsevier., 248, 117134.
https://doi.org/10.1016/j.ces.2021.117134

Nikolić D, Seidel C, Felischak M, Miličić T, Kienle A, Seidel-Morgenstern A, Petkovska M. Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations. in Chemical Engineering Science. 2022;248:117134.
doi:10.1016/j.ces.2021.117134 .

Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Miličić, Tamara, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part I Single input modulations" in Chemical Engineering Science, 248 (2022):117134,
https://doi.org/10.1016/j.ces.2021.117134 . .

TY  - JOUR
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Miličić, Tamara
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4820
AB  - The analysis of the potential to improve performance of a methanol synthesis reactor through forced periodical operations by Nonlinear Frequency Response method is presented. The methanol synthesis in an isothermal and isobaric lab-scale CSTR is considered. First, the analysis was performed for single input modulations (in Part I), which showed that significant improvements can't be achieved. Here, the study is extended to analysis of simultaneous modulations of two inputs. All possible input combinations (6 cases) are analysed and the optimal forcing parameters, maximizing the time-average methanol production, were determined. For all combinations the improvement is possible, but for some cases it is not significant. The highest improvement is predicted for simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate. This case, for which it is possible to achieve up to 33.51 % of methanol production, is analysed it detail and optimized using multi-objective optimization.
PB  - Elsevier
T2  - Chemical Engineering Science
T1  - Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs
VL  - 248
SP  - 117133
DO  - 10.1016/j.ces.2021.117133
ER  - 

@article{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Miličić, Tamara and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "The analysis of the potential to improve performance of a methanol synthesis reactor through forced periodical operations by Nonlinear Frequency Response method is presented. The methanol synthesis in an isothermal and isobaric lab-scale CSTR is considered. First, the analysis was performed for single input modulations (in Part I), which showed that significant improvements can't be achieved. Here, the study is extended to analysis of simultaneous modulations of two inputs. All possible input combinations (6 cases) are analysed and the optimal forcing parameters, maximizing the time-average methanol production, were determined. For all combinations the improvement is possible, but for some cases it is not significant. The highest improvement is predicted for simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate. This case, for which it is possible to achieve up to 33.51 % of methanol production, is analysed it detail and optimized using multi-objective optimization.",
publisher = "Elsevier",
journal = "Chemical Engineering Science",
title = "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs",
volume = "248",
pages = "117133",
doi = "10.1016/j.ces.2021.117133"
}

Nikolić, D., Seidel, C., Felischak, M., Miličić, T., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs. in Chemical Engineering Science
Elsevier., 248, 117133.
https://doi.org/10.1016/j.ces.2021.117133

Nikolić D, Seidel C, Felischak M, Miličić T, Kienle A, Seidel-Morgenstern A, Petkovska M. Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs. in Chemical Engineering Science. 2022;248:117133.
doi:10.1016/j.ces.2021.117133 .

Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Miličić, Tamara, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Forced periodic operations of a chemical reactor for methanol synthesis – The search for the best scenario based on Nonlinear Frequency Response Method. Part II Simultaneous modulation of two inputs" in Chemical Engineering Science, 248 (2022):117133,
https://doi.org/10.1016/j.ces.2021.117133 . .

TY  - CONF
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Marinković, Dalibor
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4926
AB  - Forced periodic operations, as one way of Process Intensification, can be used in order to achieve better performances of chemical reactors, in comparison to conventional steady-state operation. In this study the Nonlinear Frequency Response (NFR) method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance was used. The analysis was done for the methanol synthesis using a standard Cu/ZnO catalyst performed in an isothermal and isobaric lab-scale CSTR. At first the single input modulations were analysed. The inputs considered for periodic modulation are: partial pressures of each reactant in the feed stream and the total volumetric inlet flow-rate. The objective was to maximize the mean molar outlet flow-rate of methanol. The specific forcing parameters were optimized. The results of the NFR analysis showed that modulations of single inputs do not provide potential for significant improvements. 
The study was extended to analysis of periodic operations with simultaneous modulations of two inputs. Six possible input combinations were analysed and the optimal forcing parameters which maximizing again the time-average methanol production were determined. For all combinations an improvement is possible, but for some cases it was found to be not significant. However, significant 
improvements are predicted for a) simultaneous modulation of the partial pressure of CO2 in the feed steam and the volumetric inlet flow-rate and b) simultaneous modulation of the partial pressure of hydrogen (H2) and the volumetric inlet flow-rate [1, 2]. The highest improvement could be achieved for 
simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate.
PB  - The Wilhelm und Else Heraeus-Stiftung, Germany
C3  - Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions
T1  - Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method
SP  - 75
UR  - https://hdl.handle.net/21.15107/rcub_cer_4926
ER  - 

@conference{
author = "Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Marinković, Dalibor and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2022",
abstract = "Forced periodic operations, as one way of Process Intensification, can be used in order to achieve better performances of chemical reactors, in comparison to conventional steady-state operation. In this study the Nonlinear Frequency Response (NFR) method, a powerful analytical and approximate tool which gives an answer whether and under which conditions certain periodic operation would lead to improvement of process performance was used. The analysis was done for the methanol synthesis using a standard Cu/ZnO catalyst performed in an isothermal and isobaric lab-scale CSTR. At first the single input modulations were analysed. The inputs considered for periodic modulation are: partial pressures of each reactant in the feed stream and the total volumetric inlet flow-rate. The objective was to maximize the mean molar outlet flow-rate of methanol. The specific forcing parameters were optimized. The results of the NFR analysis showed that modulations of single inputs do not provide potential for significant improvements. 
The study was extended to analysis of periodic operations with simultaneous modulations of two inputs. Six possible input combinations were analysed and the optimal forcing parameters which maximizing again the time-average methanol production were determined. For all combinations an improvement is possible, but for some cases it was found to be not significant. However, significant 
improvements are predicted for a) simultaneous modulation of the partial pressure of CO2 in the feed steam and the volumetric inlet flow-rate and b) simultaneous modulation of the partial pressure of hydrogen (H2) and the volumetric inlet flow-rate [1, 2]. The highest improvement could be achieved for 
simultaneous modulation of the inlet partial pressure of CO and the inlet volumetric flow rate.",
publisher = "The Wilhelm und Else Heraeus-Stiftung, Germany",
journal = "Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions",
title = "Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method",
pages = "75",
url = "https://hdl.handle.net/21.15107/rcub_cer_4926"
}

Nikolić, D., Seidel, C., Felischak, M., Marinković, D., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2022). Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method. in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions
The Wilhelm und Else Heraeus-Stiftung, Germany., 75.
https://hdl.handle.net/21.15107/rcub_cer_4926

Nikolić D, Seidel C, Felischak M, Marinković D, Kienle A, Seidel-Morgenstern A, Petkovska M. Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method. in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions. 2022;:75.
https://hdl.handle.net/21.15107/rcub_cer_4926 .

Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Marinković, Dalibor, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Possible improvement of methanol synthesis exploiting forced periodic operation: Analysis using the Nonlinear Frequency Responce Method" in Booklet with abstracts - 758. WE-Heraeus-Seminar, From Wind and Solar Energy to Chemical Energy Storage: Understanding and Engineering Catalysis under Dynamic Conditions (2022):75,
https://hdl.handle.net/21.15107/rcub_cer_4926 .

TY  - JOUR
AU  - Seidel, Carsten
AU  - Nikolić, Daliborka
AU  - Felischak, Matthias
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
AU  - Kienle, Achim
PY  - 2022
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5623
AB  - Methanol synthesis from synthesis gas with heterogeneous Cu/ZnO/Al2O3 catalysts in an isothermal gradientless reactor is described. In a theoretical study, the potential of forced periodic operation (FPO) for improving reactor performance in terms of methanol production rate and methanol yield is explored. The approach is based on a detailed kinetic model and combines nonlinear frequency response (NFR) analysis with rigorous numerical multi-objective optimization. Optimal steady-state operation is compared with optimal forced periodic operation for a given benchmark problem with and without inert nitrogen in the feed. Further, the significant influence of the saturation capacity of the solid phase on the dynamic behavior in response to step changes and periodic input modulations is studied.
PB  - Wiley
T2  - Chemical Engineering & Technology
T1  - Forced Periodic Operation of Methanol Synthesis in an Isothermal Gradientless Reactor
VL  - 45
IS  - 12
SP  - 2261
EP  - 2272
DO  - 10.1002/ceat.202200286
ER  - 

@article{
author = "Seidel, Carsten and Nikolić, Daliborka and Felischak, Matthias and Petkovska, Menka and Seidel-Morgenstern, Andreas and Kienle, Achim",
year = "2022",
abstract = "Methanol synthesis from synthesis gas with heterogeneous Cu/ZnO/Al2O3 catalysts in an isothermal gradientless reactor is described. In a theoretical study, the potential of forced periodic operation (FPO) for improving reactor performance in terms of methanol production rate and methanol yield is explored. The approach is based on a detailed kinetic model and combines nonlinear frequency response (NFR) analysis with rigorous numerical multi-objective optimization. Optimal steady-state operation is compared with optimal forced periodic operation for a given benchmark problem with and without inert nitrogen in the feed. Further, the significant influence of the saturation capacity of the solid phase on the dynamic behavior in response to step changes and periodic input modulations is studied.",
publisher = "Wiley",
journal = "Chemical Engineering & Technology",
title = "Forced Periodic Operation of Methanol Synthesis in an Isothermal Gradientless Reactor",
volume = "45",
number = "12",
pages = "2261-2272",
doi = "10.1002/ceat.202200286"
}

Seidel, C., Nikolić, D., Felischak, M., Petkovska, M., Seidel-Morgenstern, A.,& Kienle, A.. (2022). Forced Periodic Operation of Methanol Synthesis in an Isothermal Gradientless Reactor. in Chemical Engineering & Technology
Wiley., 45(12), 2261-2272.
https://doi.org/10.1002/ceat.202200286

Seidel C, Nikolić D, Felischak M, Petkovska M, Seidel-Morgenstern A, Kienle A. Forced Periodic Operation of Methanol Synthesis in an Isothermal Gradientless Reactor. in Chemical Engineering & Technology. 2022;45(12):2261-2272.
doi:10.1002/ceat.202200286 .

Seidel, Carsten, Nikolić, Daliborka, Felischak, Matthias, Petkovska, Menka, Seidel-Morgenstern, Andreas, Kienle, Achim, "Forced Periodic Operation of Methanol Synthesis in an Isothermal Gradientless Reactor" in Chemical Engineering & Technology, 45, no. 12 (2022):2261-2272,
https://doi.org/10.1002/ceat.202200286 . .

TY  - CONF
AU  - Kaps, Lothar
AU  - Seidel, Carsten
AU  - Marinković, Dalibor
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Nikolić, Daliborka
AU  - Petkovska, Menka
PY  - 2022
UR  - https://dechema.de/react_hmt_2022.html
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/6314
AB  - Continuous chemical processes are typically designed to operate under steady state 
conditions. However, there is strong evidence that an optimized forced periodic 
operation possesses the potential to improve process performance [1]. More
demonstration examples are needed to promote such advanced concepts.
In this contribution we will present results for two case studies. The first reaction 
investigated is the liquid phase hydrolysis of acetic anhydride performed in an adiabatic 
continuous stirred tank reactor (CSTR). The second examples is the heterogeneously 
catalysed gas phase synthesis of methanol performed in an isothermal and isobaric 
CSTR. Our theoretical analysis exploits independently determined kinetic models of 
these reactions [2, 3]. Besides performing numerical process simulations the Nonlinear 
Frequency Response (NFR) method [4] is used. The magnitude of possible process 
improvements depends on the applied strategy of forced periodic operation. Besides 
the input to be perturbed (concentration, flowrate, temperature, …), the forcing 
frequency and the forcing amplitude as well as the shape of the input modulation are
of relevance. In this contribution we will compare the input modulated as harmonic
(Fig 1a) and as a square wave function (“bang-bang”, Fig 1b). In order to use the NFR 
method for the latter input function an approximation via Fourier series is applied [5, 6].
The results reveal improvements of easier to practically implement square wave inputs
for both examples considered, compared to harmonic modulation of inputs [5, 6].
PB  - DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)
C3  - Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany
T1  - Evaluating the shape of input pertubation for forced periodic operation
SP  - 177
EP  - 178
UR  - https://hdl.handle.net/21.15107/rcub_cer_6314
ER  - 

@conference{
author = "Kaps, Lothar and Seidel, Carsten and Marinković, Dalibor and Kienle, Achim and Seidel-Morgenstern, Andreas and Nikolić, Daliborka and Petkovska, Menka",
year = "2022",
abstract = "Continuous chemical processes are typically designed to operate under steady state 
conditions. However, there is strong evidence that an optimized forced periodic 
operation possesses the potential to improve process performance [1]. More
demonstration examples are needed to promote such advanced concepts.
In this contribution we will present results for two case studies. The first reaction 
investigated is the liquid phase hydrolysis of acetic anhydride performed in an adiabatic 
continuous stirred tank reactor (CSTR). The second examples is the heterogeneously 
catalysed gas phase synthesis of methanol performed in an isothermal and isobaric 
CSTR. Our theoretical analysis exploits independently determined kinetic models of 
these reactions [2, 3]. Besides performing numerical process simulations the Nonlinear 
Frequency Response (NFR) method [4] is used. The magnitude of possible process 
improvements depends on the applied strategy of forced periodic operation. Besides 
the input to be perturbed (concentration, flowrate, temperature, …), the forcing 
frequency and the forcing amplitude as well as the shape of the input modulation are
of relevance. In this contribution we will compare the input modulated as harmonic
(Fig 1a) and as a square wave function (“bang-bang”, Fig 1b). In order to use the NFR 
method for the latter input function an approximation via Fourier series is applied [5, 6].
The results reveal improvements of easier to practically implement square wave inputs
for both examples considered, compared to harmonic modulation of inputs [5, 6].",
publisher = "DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)",
journal = "Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany",
title = "Evaluating the shape of input pertubation for forced periodic operation",
pages = "177-178",
url = "https://hdl.handle.net/21.15107/rcub_cer_6314"
}

Kaps, L., Seidel, C., Marinković, D., Kienle, A., Seidel-Morgenstern, A., Nikolić, D.,& Petkovska, M.. (2022). Evaluating the shape of input pertubation for forced periodic operation. in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany
DECHEMA Gesellschaft für Chemische Technik und Biotechnologie e.V. (Society for Chemical Engineering and Biotechnology)., 177-178.
https://hdl.handle.net/21.15107/rcub_cer_6314

Kaps L, Seidel C, Marinković D, Kienle A, Seidel-Morgenstern A, Nikolić D, Petkovska M. Evaluating the shape of input pertubation for forced periodic operation. in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany. 2022;:177-178.
https://hdl.handle.net/21.15107/rcub_cer_6314 .

Kaps, Lothar, Seidel, Carsten, Marinković, Dalibor, Kienle, Achim, Seidel-Morgenstern, Andreas, Nikolić, Daliborka, Petkovska, Menka, "Evaluating the shape of input pertubation for forced periodic operation" in Book of abstracts - Annual Meeting on Reaction Engineering and ProcessNet Subject Division Heat and Mass Transfer 2022, 18 – 20 July 2022  Congress Center Würzburg, Germany (2022):177-178,
https://hdl.handle.net/21.15107/rcub_cer_6314 .

TY  - JOUR
AU  - Seidel, Carsten
AU  - Nikolić, Daliborka
AU  - Felischak, Matthias
AU  - Petkovska, Menka
AU  - Seidel-Morgenstern, Andreas
AU  - Kienle, Achim
PY  - 2021
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4827
AB  - Traditionally, methanol is produced in large amounts from synthesis gas with heterogeneous Cu/ZnO/Al2O3 catalysts under steady state conditions. In this paper, the potential of alternative forced periodic operation modes is studied using numerical optimization. The focus is a well-mixed isothermal reactor with two periodic inputs, namely, CO concentration in the feed and total feed flow rate. Exploiting a detailed kinetic model which also describes the dynamics of the catalyst, a sequential NLP optimization approach is applied to compare optimal steady state solutions with optimal periodic regimes. Periodic solutions are calculated using dynamic optimization with a periodicity constraint. The NLP optimization is embedded in a multi-objective optimization framework to optimize the process with respect to two objective functions and generate the corresponding Pareto fronts. The first objective is the methanol outlet flow rate. The second objective is the methanol yield based on the total carbon in the feed. Additional constraints arising from the complex methanol reaction and the practical limitations are introduced step by step. The results show that significant improvements for both objective functions are possible through periodic forcing of the two inputs considered here.
PB  - MDPI
T2  - Processes
T1  - Optimization of Methanol Synthesis under Forced Periodic Operation
VL  - 9
IS  - 5
SP  - 872
DO  - 10.3390/pr9050872
ER  - 

@article{
author = "Seidel, Carsten and Nikolić, Daliborka and Felischak, Matthias and Petkovska, Menka and Seidel-Morgenstern, Andreas and Kienle, Achim",
year = "2021",
abstract = "Traditionally, methanol is produced in large amounts from synthesis gas with heterogeneous Cu/ZnO/Al2O3 catalysts under steady state conditions. In this paper, the potential of alternative forced periodic operation modes is studied using numerical optimization. The focus is a well-mixed isothermal reactor with two periodic inputs, namely, CO concentration in the feed and total feed flow rate. Exploiting a detailed kinetic model which also describes the dynamics of the catalyst, a sequential NLP optimization approach is applied to compare optimal steady state solutions with optimal periodic regimes. Periodic solutions are calculated using dynamic optimization with a periodicity constraint. The NLP optimization is embedded in a multi-objective optimization framework to optimize the process with respect to two objective functions and generate the corresponding Pareto fronts. The first objective is the methanol outlet flow rate. The second objective is the methanol yield based on the total carbon in the feed. Additional constraints arising from the complex methanol reaction and the practical limitations are introduced step by step. The results show that significant improvements for both objective functions are possible through periodic forcing of the two inputs considered here.",
publisher = "MDPI",
journal = "Processes",
title = "Optimization of Methanol Synthesis under Forced Periodic Operation",
volume = "9",
number = "5",
pages = "872",
doi = "10.3390/pr9050872"
}

Seidel, C., Nikolić, D., Felischak, M., Petkovska, M., Seidel-Morgenstern, A.,& Kienle, A.. (2021). Optimization of Methanol Synthesis under Forced Periodic Operation. in Processes
MDPI., 9(5), 872.
https://doi.org/10.3390/pr9050872

Seidel C, Nikolić D, Felischak M, Petkovska M, Seidel-Morgenstern A, Kienle A. Optimization of Methanol Synthesis under Forced Periodic Operation. in Processes. 2021;9(5):872.
doi:10.3390/pr9050872 .

Seidel, Carsten, Nikolić, Daliborka, Felischak, Matthias, Petkovska, Menka, Seidel-Morgenstern, Andreas, Kienle, Achim, "Optimization of Methanol Synthesis under Forced Periodic Operation" in Processes, 9, no. 5 (2021):872,
https://doi.org/10.3390/pr9050872 . .

TY  - CONF
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Nikolić, Daliborka
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
AU  - Kienle, Achim
PY  - 2020
UR  - https://www.mpi-magdeburg.mpg.de/Indo-German-Workshop2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3844
AB  - Methanol is an essential primary chemical in the chemical industry. Further, there is a
growing interest in using methanol also for chemical energy storage. Excess electrical
wind or solar energy can be converted to hydrogen and react with CO and CO2 from biogas
or waste streams to methanol. Suitable kinetic models are required for designing such
processes. Established kinetics need to be extended to account for strongly varying input
ratios of H2, CO, and CO2 in such applications leading to the need for dynamic process
operation. Kinetic models for methanol synthesis accounting for dynamic changes of the
catalyst morphology were proposed recently [1].
For the implementation and evaluation of the dynamic operation, a novel reactor concept,
incorporating a micro-berty reactor, is established. The configuration allows the
modulation of single and multiple input parameters simultaneously, such as partial
pressure, total flow-rate, and total pressure. Periodic variation of the inputs results in
fluctuating outputs. For the analysis of these changes, an online mass spectrometer (MS)
and a micro-gas chromatograph (GC) are implemented for time-resolved concentration
profiles, as well as the analysis of collected samples of multiple fluctuation periods.
A set of dynamic experiments is determined by optimal experimental design that
improves the parameter sensitivity by solving optimal control problems to identify an
optimal parameter set. Additionally, it is analyzed what kind of additional measurement
is required for further improvement of the identifiability of the kinetic model [2].
The nonlinear dynamic behavior of the methanol synthesis can be exploited by a forced
periodic modulation of different feed streams and total flow-rate (separately of
simultaneously) that result in improvements of the time-average output, in comparison to
the steady-state process, concerning different objective functions. The nonlinear
frequency response (NFR) analysis [3] is used to estimate suitable input variations and
the corresponding optimal dynamic parameters (forcing frequency, amplitudes, and phase
difference). The NFR method was already applied in various cases [4–6], and it represents
promising starting points for rigorous dynamic optimization.
The selection of the objective functions for single- and multi-objective optimization of
forced periodic operations is critically discussed.
C3  - 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany
T1  - Optimization of methanol synthesis under forced dynamic operation
UR  - https://hdl.handle.net/21.15107/rcub_cer_3844
ER  - 

@conference{
author = "Seidel, Carsten and Felischak, Matthias and Nikolić, Daliborka and Seidel-Morgenstern, Andreas and Petkovska, Menka and Kienle, Achim",
year = "2020",
abstract = "Methanol is an essential primary chemical in the chemical industry. Further, there is a
growing interest in using methanol also for chemical energy storage. Excess electrical
wind or solar energy can be converted to hydrogen and react with CO and CO2 from biogas
or waste streams to methanol. Suitable kinetic models are required for designing such
processes. Established kinetics need to be extended to account for strongly varying input
ratios of H2, CO, and CO2 in such applications leading to the need for dynamic process
operation. Kinetic models for methanol synthesis accounting for dynamic changes of the
catalyst morphology were proposed recently [1].
For the implementation and evaluation of the dynamic operation, a novel reactor concept,
incorporating a micro-berty reactor, is established. The configuration allows the
modulation of single and multiple input parameters simultaneously, such as partial
pressure, total flow-rate, and total pressure. Periodic variation of the inputs results in
fluctuating outputs. For the analysis of these changes, an online mass spectrometer (MS)
and a micro-gas chromatograph (GC) are implemented for time-resolved concentration
profiles, as well as the analysis of collected samples of multiple fluctuation periods.
A set of dynamic experiments is determined by optimal experimental design that
improves the parameter sensitivity by solving optimal control problems to identify an
optimal parameter set. Additionally, it is analyzed what kind of additional measurement
is required for further improvement of the identifiability of the kinetic model [2].
The nonlinear dynamic behavior of the methanol synthesis can be exploited by a forced
periodic modulation of different feed streams and total flow-rate (separately of
simultaneously) that result in improvements of the time-average output, in comparison to
the steady-state process, concerning different objective functions. The nonlinear
frequency response (NFR) analysis [3] is used to estimate suitable input variations and
the corresponding optimal dynamic parameters (forcing frequency, amplitudes, and phase
difference). The NFR method was already applied in various cases [4–6], and it represents
promising starting points for rigorous dynamic optimization.
The selection of the objective functions for single- and multi-objective optimization of
forced periodic operations is critically discussed.",
journal = "4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany",
title = "Optimization of methanol synthesis under forced dynamic operation",
url = "https://hdl.handle.net/21.15107/rcub_cer_3844"
}

Seidel, C., Felischak, M., Nikolić, D., Seidel-Morgenstern, A., Petkovska, M.,& Kienle, A.. (2020). Optimization of methanol synthesis under forced dynamic operation. in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany.
https://hdl.handle.net/21.15107/rcub_cer_3844

Seidel C, Felischak M, Nikolić D, Seidel-Morgenstern A, Petkovska M, Kienle A. Optimization of methanol synthesis under forced dynamic operation. in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany. 2020;.
https://hdl.handle.net/21.15107/rcub_cer_3844 .

Seidel, Carsten, Felischak, Matthias, Nikolić, Daliborka, Seidel-Morgenstern, Andreas, Petkovska, Menka, Kienle, Achim, "Optimization of methanol synthesis under forced dynamic operation" in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany (2020),
https://hdl.handle.net/21.15107/rcub_cer_3844 .

TY  - CONF
AU  - Petkovska, Menka
AU  - Kienle, Achim
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Felischak, Matthias
AU  - Seidel-Morgenstern, Andreas
PY  - 2020
UR  - https://www.mpi-magdeburg.mpg.de/Indo-German-Workshop2020
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3846
AB  - We used the nonlinear frequency response (NFR) method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy. Recently we started to analyze both theoretically and experimentally the potential of applying a forced periodic operation to improve the methanol synthesis from CO, CO2 and H2 using the conventional Cu/ZnO/Al2O3 catalysts. This work is based on a recently published detailed model of this reaction, which is capable to quantify the rates under dynamic conditions (C. Seidel, A. Jörke, B. Vollbrecht, A. Seidel-Morgenstern, A. Kienle, Chem. Eng. Sci. 175 (2917) 130–138).
C3  - 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany
T1  - Forced periodic reactor operation
UR  - https://hdl.handle.net/21.15107/rcub_cer_3846
ER  - 

@conference{
author = "Petkovska, Menka and Kienle, Achim and Nikolić, Daliborka and Seidel, Carsten and Felischak, Matthias and Seidel-Morgenstern, Andreas",
year = "2020",
abstract = "We used the nonlinear frequency response (NFR) method in order to identify forced periodic conditions under which the acetic acid anhydride hydrolysis (chosen as a test reaction) can be favorably performed in a CSTR. Based on the results of the theoretical analysis, experimental investigations were performed using a lab-scale reactor exposed to two fluctuating inlet streams (water and acetic anhydride) with adjustable flow-rates, which enables modulation of the inlet reactant concentrations or/and total flow-rates in a flexible manner. The concentration of acetic acid formed is measured in the reactor online and used to monitor the process dynamics. Averaged values of the product outlet stream serve to validate the mean values predicted by NFR analysis and to evaluate the potential of this flexible forcing strategy. Recently we started to analyze both theoretically and experimentally the potential of applying a forced periodic operation to improve the methanol synthesis from CO, CO2 and H2 using the conventional Cu/ZnO/Al2O3 catalysts. This work is based on a recently published detailed model of this reaction, which is capable to quantify the rates under dynamic conditions (C. Seidel, A. Jörke, B. Vollbrecht, A. Seidel-Morgenstern, A. Kienle, Chem. Eng. Sci. 175 (2917) 130–138).",
journal = "4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany",
title = "Forced periodic reactor operation",
url = "https://hdl.handle.net/21.15107/rcub_cer_3846"
}

Petkovska, M., Kienle, A., Nikolić, D., Seidel, C., Felischak, M.,& Seidel-Morgenstern, A.. (2020). Forced periodic reactor operation. in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany.
https://hdl.handle.net/21.15107/rcub_cer_3846

Petkovska M, Kienle A, Nikolić D, Seidel C, Felischak M, Seidel-Morgenstern A. Forced periodic reactor operation. in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany. 2020;.
https://hdl.handle.net/21.15107/rcub_cer_3846 .

Petkovska, Menka, Kienle, Achim, Nikolić, Daliborka, Seidel, Carsten, Felischak, Matthias, Seidel-Morgenstern, Andreas, "Forced periodic reactor operation" in 4th Indo-German Workshop on Advances in Materials, Reaction& Separation Processes, Berlin, Germany (2020),
https://hdl.handle.net/21.15107/rcub_cer_3846 .

TY  - CONF
AU  - Nikolić, Daliborka
AU  - Seidel, Carsten
AU  - Kienle, Achim
AU  - Seidel-Morgenstern, Andreas
AU  - Petkovska, Menka
PY  - 2019
UR  - https://kuleuvencongres.be/ipic2019/Home
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3843
AB  - In this work, the NFR method is implemented for evaluation of possible improvement for the reaction of methanol synthesis by hydrogenation of CO and CO2, using a standard Cu/ZnO/Al2O3 catalyst. For start, a forced periodically operated isothermal continuous-stirred tank reactor (CSTR) is considered. A simplified (lumped) kinetic model of methanol synthesis with 14 parameters which were estimated from the results of an extensive experimental investigation is used. The NFR method is performed for evaluation of possible increase of methanol production by modulating the mole fractions of CO and CO2 in the feed stream, as well as their simultaneous modulation. The necessary asymmetrical second order frequency response functions correlating the methanol production with the modulated inputs are derived and the forcing
parameters leading to improvement of the reactor performance are determined. The results of
the NFR analysis will further be used for rigorous optimisation of the forced periodic operations
and planning the best experimental scenarios. The final step will be experimental investigation and confirmation on a laboratory scale reactor.
C3  - 2nd International Process Intensification Conference, Leuven, Belgium
T1  - Intensification of a chemical reactor for methanol synthesis through forced periodic operations- Evaluation based on Nonlinear Frequency Response Analysis
UR  - https://hdl.handle.net/21.15107/rcub_cer_3843
ER  - 

@conference{
author = "Nikolić, Daliborka and Seidel, Carsten and Kienle, Achim and Seidel-Morgenstern, Andreas and Petkovska, Menka",
year = "2019",
abstract = "In this work, the NFR method is implemented for evaluation of possible improvement for the reaction of methanol synthesis by hydrogenation of CO and CO2, using a standard Cu/ZnO/Al2O3 catalyst. For start, a forced periodically operated isothermal continuous-stirred tank reactor (CSTR) is considered. A simplified (lumped) kinetic model of methanol synthesis with 14 parameters which were estimated from the results of an extensive experimental investigation is used. The NFR method is performed for evaluation of possible increase of methanol production by modulating the mole fractions of CO and CO2 in the feed stream, as well as their simultaneous modulation. The necessary asymmetrical second order frequency response functions correlating the methanol production with the modulated inputs are derived and the forcing
parameters leading to improvement of the reactor performance are determined. The results of
the NFR analysis will further be used for rigorous optimisation of the forced periodic operations
and planning the best experimental scenarios. The final step will be experimental investigation and confirmation on a laboratory scale reactor.",
journal = "2nd International Process Intensification Conference, Leuven, Belgium",
title = "Intensification of a chemical reactor for methanol synthesis through forced periodic operations- Evaluation based on Nonlinear Frequency Response Analysis",
url = "https://hdl.handle.net/21.15107/rcub_cer_3843"
}

Nikolić, D., Seidel, C., Kienle, A., Seidel-Morgenstern, A.,& Petkovska, M.. (2019). Intensification of a chemical reactor for methanol synthesis through forced periodic operations- Evaluation based on Nonlinear Frequency Response Analysis. in 2nd International Process Intensification Conference, Leuven, Belgium.
https://hdl.handle.net/21.15107/rcub_cer_3843

Nikolić D, Seidel C, Kienle A, Seidel-Morgenstern A, Petkovska M. Intensification of a chemical reactor for methanol synthesis through forced periodic operations- Evaluation based on Nonlinear Frequency Response Analysis. in 2nd International Process Intensification Conference, Leuven, Belgium. 2019;.
https://hdl.handle.net/21.15107/rcub_cer_3843 .

Nikolić, Daliborka, Seidel, Carsten, Kienle, Achim, Seidel-Morgenstern, Andreas, Petkovska, Menka, "Intensification of a chemical reactor for methanol synthesis through forced periodic operations- Evaluation based on Nonlinear Frequency Response Analysis" in 2nd International Process Intensification Conference, Leuven, Belgium (2019),
https://hdl.handle.net/21.15107/rcub_cer_3843 .