Publications of Grégoire Léonard
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See detailCO2 Future at the University of Liège
Léonard, Grégoire ULiege

Conference (2018, January 26)

In this presentation, the activities related to CO2 at the University of Liège will be presented and a focus will be set on the CO2FUTURE platform recently created at ULiège. After shortly introducing the ... [more ▼]

In this presentation, the activities related to CO2 at the University of Liège will be presented and a focus will be set on the CO2FUTURE platform recently created at ULiège. After shortly introducing the challenges related to CO2 emissions, a brief overview of main CO2 capture technologies will be made, evidencing the maturity level of the different capture methods. In particular, our research activities related to post-combustion capture and solvent stability will be described. Then, different CO2 re-use technologies will be discussed, with the focus set on process design and reactor engineering. Indeed, depending on the reaction and catalyst used, the reactor design may be adapted to optimize reaction conditions and reach optimal production and selectivity. This approach will be illustrated by several CO2 reuse products resulting from the power-to-fuel process that converts CO2 into energy carriers such as methanol or DME. The interest for power-to-fuel technologies from an energy storage point of view will be evidenced as well. Results from a student’s integrated project dedicated to CO2 re-use in a Brazilian case study will be presented. Finally, we will present the activities in the field of CO2 at the University of Liège, and introduce the CO2FUTURE platform that gathers 3 faculties and 4 labs in the field of CO2. Further fields of research related to CO2 re-use will be described, and potential collaboration pathways will be evidenced. [less ▲]

Detailed reference viewed: 80 (8 ULiège)
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See detailDynamic simulation of a post-combustion CO2 capture pilot with assessment of solvent degradation
Benkoussas, Hana ULiege; Léonard, Grégoire ULiege; Ioana Burca, Madalina et al

in Computer Aided Chemical Engineering (2018), 43(1341-1346),

To predict solvent degradation in an industrial CO2 capture process and for a better understanding of the interactions between solvent degradation and performance of the capture process, an existing ... [more ▼]

To predict solvent degradation in an industrial CO2 capture process and for a better understanding of the interactions between solvent degradation and performance of the capture process, an existing dynamic model of an amine based pilot plant for carbon capture has been improved and adapted at the University of Babes-Bolyai on the basis of the kinetic model of solvent oxidative degradation proposed at the University of Liège. The developed dynamic model has been used to simulate the transient behavior of the CO2 capture process with assessment of solvent degradation. [less ▲]

Detailed reference viewed: 177 (115 ULiège)
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See detailRecent Evolutions and Trends in the Use of Computer Aided Chemical Engineering for Educational Purposes at the University of Liège
Léonard, Grégoire ULiege; Belboom, Sandra ULiege; Toye, Dominique ULiege et al

in Computer Aided Chemical Engineering (2017)

The present paper addresses the evolution and perspectives in the teaching of CAPE methods in the Department of Chemical Engineering at the University of Liège. The transition that happened in the 90ies ... [more ▼]

The present paper addresses the evolution and perspectives in the teaching of CAPE methods in the Department of Chemical Engineering at the University of Liège. The transition that happened in the 90ies with the arrival of commercial software is highlighted, as the learning outcomes evolved from the ability of building programs to solve chemical engineering problems towards the ability to use complex commercial software and to understand their limitations. Moreover, CAPE methods were extended to non-dedicated CAPE courses, which is illustrated here by the goals and challenges of their use in courses like “Reactor Engineering” and “Life Cycle Analysis”. It was observed that students sometimes assume that CAPE softwares provide straightforward and trustworthy solutions without the need of understanding their mathematical bases and assumptions. Thus, solutions to make students aware of these limitations are proposed, including the creation of an integrated project focussing on complex multi-disciplinary issues, evidencing the need for critical input from the operator. [less ▲]

Detailed reference viewed: 90 (17 ULiège)
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See detailCO2 activities at the University of Liège
Léonard, Grégoire ULiege

Scientific conference (2017, September)

Detailed reference viewed: 37 (2 ULiège)
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See detailChallenges of CO2 capture as an application of fluid separation techniques
Léonard, Grégoire ULiege

Conference (2017, May)

The presentation offers a review of CO2 capture technologies presented as an application of fluid separation. CO2 capture processes (Post-combustion, pre-combustion, oxyfuel combustion and industrial ... [more ▼]

The presentation offers a review of CO2 capture technologies presented as an application of fluid separation. CO2 capture processes (Post-combustion, pre-combustion, oxyfuel combustion and industrial processes) and CO2 capture methods (absorption, adsorption, membranes...) are described, and illustrated by industrial examples of these technologies. Techno-economic challenges faced by these technologies are also mentionned, and perspectives for future developments are discussed. [less ▲]

Detailed reference viewed: 75 (8 ULiège)
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See detailEffect of agitation rate on oxydative degradation of monoethanolamine
Benkoussas, Hana ULiege; Léonard, Grégoire ULiege; Kerbachi, Rabah

Poster (2017)

Detailed reference viewed: 164 (104 ULiège)
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See detailIndustrial Integration of Biotechnological Processes from Raw Material to Energy Integration: Study by Modeling Approach
Léonard, Grégoire ULiege; Pfennig, Andreas ULiege; Celebi, Ayse Dilan et al

in Darvishi, Farshad; Hiligsmann, Serge (Eds.) Microbial Fuels: Technologies and Applications (2017)

Detailed reference viewed: 76 (14 ULiège)
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See detailCCUS ou le rôle clé du CO2 dans la transition énergétique
Léonard, Grégoire ULiege

Conference (2016, November 29)

Detailed reference viewed: 36 (8 ULiège)
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See detailStockage intersaisonnier d’énergie
Léonard, Grégoire ULiege

Conference given outside the academic context (2016)

Detailed reference viewed: 17 (2 ULiège)
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See detailIntegrated Project with Focus on Energy Transition and Circular Economy for Developing Engineering Students' Soft Skills
Léonard, Grégoire ULiege; Pfennig, Andreas ULiege; Toye, Dominique ULiege et al

Poster (2016, September 05)

The present work reports the experience of an integrated project developed at the University of Liege for master students in chemical engineering. The goals are to promote the acquisition of soft skills ... [more ▼]

The present work reports the experience of an integrated project developed at the University of Liege for master students in chemical engineering. The goals are to promote the acquisition of soft skills and to consolidate technical knowledge by integrating and linking chemical engineering disciplines usually taught separately. A case study was selected to address some of the challenges related to energy transition: students had to design the energy system of a remote island and make it as energy independent and CO2-neutral as possible by 2030. The course of action during the academic year, the assessment of soft skills, and the tools offered to ease the mentoring and encourage the acquisition of soft skills are described. Not all implemented techniques performed equally well, and this project finally appeared to be a challenge for the teaching team as well. [less ▲]

Detailed reference viewed: 79 (14 ULiège)
See detailUtilisation of CO2 from an Industrial source for Methanol production
Font-Palma, Carolina; Douven, Sigrid ULiege; Léonard, Grégoire ULiege

Conference (2016, September)

Detailed reference viewed: 77 (16 ULiège)
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See detailDesign and Evaluation of a High-Density Energy Storage Route with CO2 Re-Use, Water Electrolysis and Methanol Synthesis
Léonard, Grégoire ULiege; Giulini, Davide; Villarreal-Singer, Diego

in Computer Aided Chemical Engineering (2016), 38

The energy transition corresponding to more electricity generation from variable and decentralized renewable energy sources requires the development of electricity storage technologies ranging from ... [more ▼]

The energy transition corresponding to more electricity generation from variable and decentralized renewable energy sources requires the development of electricity storage technologies ranging from seconds to seasons. The power-to-fuel process provides a way to store electricity as a liquid energy vector, leading to high energy density and cheap long-term storage at ambient conditions. In the present work, we study the powerto- methanol process combining CO2 capture, water/CO2 co-electrolysis and methanol synthesis. An Aspen Plus model focussing on the electrolysis and methanol synthesis sub-processes is presented. The energy conversion efficiency is improved from 40.1 to 53.0 % thanks to heat integration using the pinch method. Further works include the experimental demonstration of this technology as well as the development of control strategies for its regulation. [less ▲]

Detailed reference viewed: 113 (9 ULiège)
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See detailDesign and evaluation of a high-density energy storage route with CO2 re-use, water electrolysis and methanol synthesis
Léonard, Grégoire ULiege; Giulini, Davide; Villarreal-Singer, Diego

Poster (2016, June)

In the context of the Energy Transition, electricity storage ranging from seconds to seasons is needed to increase the integration of variable renewables sources. The power-tofuel process uses a liquid ... [more ▼]

In the context of the Energy Transition, electricity storage ranging from seconds to seasons is needed to increase the integration of variable renewables sources. The power-tofuel process uses a liquid energy vector with high energy density for long-term energy storage. In the present work, we simulate the power-to-methanol process in Aspen Plus. Then, we use heat integration to increase the conversion efficiency from 40.1 to 53.0 %, evidencing large improvement potential thanks to process integration. Further work includes experimental design and development of control strategies. [less ▲]

Detailed reference viewed: 49 (2 ULiège)
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See detailReactors for CO2 utilization
Léonard, Grégoire ULiege; Toye, Dominique ULiege; Grignard, Bruno ULiege

Scientific conference (2016, January)

In this presentation, the first focus will be set on the importance of reactors in chemical and energy conversion processes and the main reactor types that are used in the industry will be presented. The ... [more ▼]

In this presentation, the first focus will be set on the importance of reactors in chemical and energy conversion processes and the main reactor types that are used in the industry will be presented. The limiting criteria for choosing the right reactor for the desired application will be listed, evidencing the fact that “one-size-fits-all” solutions are not well suited to chemical reactor engineering. The case of amine solvent degradation and experimental reactors to mimic conditions observed in CO2 capture plants will be discussed, with a special focus on the choice between batch and semi-continuous reactors (batch feed on the liquid side, continuous gas feed). The basics of reactor engineering will then be applied to CO2 chemical conversion processes, for which the main CO2 conversion pathways will be detailed, and the coupling between the CO2 re-use route and the selected reactor will be highlighted. Among others, the main CO2 chemical re-use routes include the synthesis of various organic molecules ranging from fuels for energy storage up to polymers for new materials and applications. Finally, a short description of the activities of the PEPs and CERM groups in the field of CO2 capture and re-use will be presented. In particular, activities about solvent degradation for CO2 capture and power-to-methanol as a technology for long-term (interseasonal) energy storage will be detailed. [less ▲]

Detailed reference viewed: 40 (1 ULiège)
See detailA Transportable Remotely-Operated Research Facility for Industrial Post-Combustion CO2Capture Technologies under Accelerated Conditions
Lin, Chih-Wei; Léonard, Grégoire ULiege; Gibbins, Jon et al

Poster (2016)

The Advanced Capture Testing in a Transportable Remotely-Operated Minilab (ACTTROM) is a transportable test facility operated at industrial sites for bench-scale evaluation of post-combustion CO2 capture ... [more ▼]

The Advanced Capture Testing in a Transportable Remotely-Operated Minilab (ACTTROM) is a transportable test facility operated at industrial sites for bench-scale evaluation of post-combustion CO2 capture technologies under realistic industrial flue gases. [less ▲]

Detailed reference viewed: 13 (0 ULiège)
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See detailInfluence of process operating conditions on solvent thermal and oxidative degradation in post-combustion CO2 capture
Léonard, Grégoire ULiege; Crosset, Cyril; Toye, Dominique ULiege et al

in Computers and Chemical Engineering (2015), 83

The CO2 post-combustion capture with amine solvents is modeled as a complex system interconnecting process energy consumption and solvent degradation and emission. Based on own experimental data ... [more ▼]

The CO2 post-combustion capture with amine solvents is modeled as a complex system interconnecting process energy consumption and solvent degradation and emission. Based on own experimental data, monoethanolamine degradation is included into a CO2 capture process model. The influence of operating conditions on solvent loss is validated with pilot plant data from literature. Predicted solvent consumption rates are in better agreement with plant data than any previous work, and pathways are discussed to further refine the model. Oxidative degradation in the absorber is the largest cause of solvent loss while thermal degradation does not appear as a major concern. Using a single model, the process exergy requirement decreases by 10.8% and the solvent loss by 11.1% compared to our base case. As a result, this model provides a practical tool to simultaneously minimize the process energy requirement and the solvent consumption in post-combustion CO2 capture plants with amine solvents. [less ▲]

Detailed reference viewed: 109 (31 ULiège)
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See detailCOPPER LEACHING FROM WASTE ELECTRIC CABLES BY BIOHYDROMETALLURGY
Lambert, Fanny ULiege; Bastin, David ULiege; Gaydardzhiev, Stoyan ULiege et al

in Minerals Engineering (2015)

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption ... [more ▼]

This study examines the leaching of copper from waste electric cables by chemical leaching and leaching catalysed by Acidithiobacillus ferrooxidans in terms of leaching kinetics and reagents consumption. Operational parameters such as the nature of the oxidant (Fe3+, O2), the initial ferric iron concentration (0-10 g/L) and the temperature (21-50°C) were identified to have an important influence on the degree of copper solubilisation. At optimal process conditions, copper extraction above 90% was achieved in both leaching systems, with a leaching duration of 1 day. The bacterial leaching system slightly outperformed the chemical one but the positive effect of regeneration of Fe3+ was limited. It appears that the Fe2+ bio-oxidation is not sufficiently optimised. Best results in terms of copper solubilisation kinetics were obtained for the abiotic test at 50°C and for the biotic test at 35°C. Moreover, the study showed that in same operating conditions, a lower acid consumption was recorded for the biotic test than for the abiotic test. [less ▲]

Detailed reference viewed: 151 (56 ULiège)