Jens Bremer
YOU?
Author Swipe
View article: Core‐Shell Catalyst Pellets for CO<sub>2</sub> Methanation in a Pilot‐Scale Fixed‐Bed Reactor
Core‐Shell Catalyst Pellets for CO<sub>2</sub> Methanation in a Pilot‐Scale Fixed‐Bed Reactor Open
Power‐to‐methane (PtM) offers an efficient opportunity for surplus renewable energy storage, but heat management is a major challenge for conducting the highly exothermic methanation reaction. To address this challenge, this study presents…
View article: From Bodenstein to Péclet – Dimensionless Numbers for Axial Dispersion in Chemical Reactors
From Bodenstein to Péclet – Dimensionless Numbers for Axial Dispersion in Chemical Reactors Open
In the present contribution, the historical development of dimensionless numbers describing axial mixing effects in chemical reactors is analyzed. While the Bodenstein number has become established in Europe, the American literature often …
View article: Trendbericht: Technische Chemie 2024
Trendbericht: Technische Chemie 2024 Open
Die Zirkularität von Stoffströmen, die Nachhaltigkeit, vor allem die Nutzung biogener Rohstoffe, sowie die Ressourcen‐ und Energiesicherheit sind seit Jahren wichtige Ziele. Ob in der Reaktions‐ oder der Trenntechnik, alle Bereiche der tec…
View article: Enhancing Lithium Recycling Efficiency in Pyrometallurgical Processing through Thermodynamic-Based Optimization and Design of Spent Lithium-Ion Battery Slag Compositions
Enhancing Lithium Recycling Efficiency in Pyrometallurgical Processing through Thermodynamic-Based Optimization and Design of Spent Lithium-Ion Battery Slag Compositions Open
The increasing demand for lithium in lithium-ion battery (LIB) applications necessitates innovative recycling strategies. Combined pyrometallurgical–hydrometallurgical recycling has gained increased attention for lithium recovery from slag…
View article: Challenges in data-based reactor modeling: A critical analysis of purely data-driven and hybrid models for a CSTR case study
Challenges in data-based reactor modeling: A critical analysis of purely data-driven and hybrid models for a CSTR case study Open
In this study, we critically examine the performance of hybrid and purely data-driven models in reactor systems using catalytic CO2 methanation in a continuously stirred tank reactor as a representative case. Our comparative analysis inclu…
View article: Learning reduced-order Quadratic-Linear models in Process Engineering using Operator Inference
Learning reduced-order Quadratic-Linear models in Process Engineering using Operator Inference Open
In this work, we address the challenge of efficiently modeling dynamical systems in process engineering. We use reduced-order model learning, specifically operator inference. This is a non-intrusive, data-driven method for learning dynamic…
View article: Multi-period optimization for the design and operation of a flexible power-to-methanol process
Multi-period optimization for the design and operation of a flexible power-to-methanol process Open
The increasing share of renewable resources in the context of energy transition scenarios requires new methodologies for the design and operation of chemical production facilities, which must adapt to the unsteady nature of their power sup…
View article: Core–shell catalyst pellets for effective reaction heat management
Core–shell catalyst pellets for effective reaction heat management Open
Catalyst research is concerned with synthesizing increasingly active materials, leading to safety issues at reactor scale, unless the reaction heat release is controllable. Computational studies predict that core–shell pellets with catalyt…
View article: Digitization in Catalysis Research: Towards a Holistic Description of a Ni/Al<sub>2</sub>O<sub>3</sub> Reference Catalyst for CO<sub>2</sub> Methanation
Digitization in Catalysis Research: Towards a Holistic Description of a Ni/Al<sub>2</sub>O<sub>3</sub> Reference Catalyst for CO<sub>2</sub> Methanation Open
There is considerable motivation in the catalysis community and chemical industry to envision a future where rational catalyst design and targeted chemical process optimization become standard. Achieving this goal for heterogeneous catalys…
View article: Load-flexible fixed-bed reactors by multi-period design optimization
Load-flexible fixed-bed reactors by multi-period design optimization Open
Many research activities focus on load-flexible fixed-bed reactors in the context of Power-to-X concepts. One of the main issues is the occurrence of hazardous temperature excursions in steady state and during dynamic load changes. The dil…
View article: Novel Multiplicity and Stability Criteria for Non-Isothermal Fixed-Bed Reactors
Novel Multiplicity and Stability Criteria for Non-Isothermal Fixed-Bed Reactors Open
With the increasing need to utilize carbon dioxide, fixed-bed reactors for catalytic hydrogenation will become a decisive element for modern chemicals and energy carrier production. In this context, the resilience and flexibility to changi…
View article: Non-intrusive Time-POD for Optimal Control of a Fixed-Bed Reactor for CO2 Methanation
Non-intrusive Time-POD for Optimal Control of a Fixed-Bed Reactor for CO2 Methanation Open
The optimization of a controlled process in a simulation without access to the model itself is a common scenario and very relevant to many chemical engineering applications. A general approach is to apply a black-box optimization algorithm…
View article: Porosity and Structure of Hierarchically Porous Ni/Al2O3 Catalysts for CO2 Methanation
Porosity and Structure of Hierarchically Porous Ni/Al2O3 Catalysts for CO2 Methanation Open
CO2 methanation is often performed on Ni/Al2O3 catalysts, which can suffer from mass transport limitations and, therefore, decreased efficiency. Here we show the application of a hierarchically porous Ni/Al2O3 catalyst for methanation of C…
View article: Optimal catalyst‐reactor design for flexible CO<sub>2</sub> methanation
Optimal catalyst‐reactor design for flexible CO<sub>2</sub> methanation Open
View article: Advanced operating strategies for non-isothermal fixed-bed reactors exemplified for CO 2 methanation
Advanced operating strategies for non-isothermal fixed-bed reactors exemplified for CO 2 methanation Open
Fixed-bed reactors can effectively perform chemical reactions with high space-timeyields and are, therefore, an essential part of many processes in the chemical industry. With the increasing integration of volatile renewable energies, thes…
View article: Optimal catalyst particle design for flexible fixed-bed CO2 methanation reactors
Optimal catalyst particle design for flexible fixed-bed CO2 methanation reactors Open
Power-to-Methane is a concept for energy storage harvested from renewable sources, for instance solar and wind power. A flexible operation of catalytic fixed-bed methanation reactors, according to the availability of energy, eliminates the…
View article: Operation range extension<i>via</i>hot-spot control for catalytic CO<sub>2</sub>methanation reactors
Operation range extension<i>via</i>hot-spot control for catalytic CO<sub>2</sub>methanation reactors Open
Intelligent coolant temperature adjustment allows hot-spot stabilization in exothermic fixed-bed reactors at the industrial-scale and provides additional operating points with increased performance and moderate catalyst temperatures.
View article: Flexible Production of Synthetic Methane: Dynamic Operation and Control of Fixed‐Bed Methanation Reactors
Flexible Production of Synthetic Methane: Dynamic Operation and Control of Fixed‐Bed Methanation Reactors Open
View article: CO<sub>2</sub> methanation: Optimal start‐up control of a fixed‐bed reactor for power‐to‐gas applications
CO<sub>2</sub> methanation: Optimal start‐up control of a fixed‐bed reactor for power‐to‐gas applications Open
Utilizing volatile renewable energy sources (e.g., solar, wind) for chemical production systems requires a deeper understanding of their dynamic operation modes. Taking the example of a methanation reactor in the context of power‐to‐gas ap…