Publications of Grégoire Léonard
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See detailPlein gaz : enjeux et perspectives de la valorisation du CO2
Léonard, Grégoire ULiege; Evrard, Brigitte ULiege; Grignard, Bruno ULiege et al

Conference given outside the academic context (2019)

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See detailTowards sustainable methanol from industrial CO2 sources
Douven, Sigrid ULiege; Benkoussas, Hana ULiege; Font-Palma, Carolina et al

in North, Michael; Styring, Peter (Eds.) Carbon dioxide utilisation (2019)

Mitigation of carbon dioxide emissions from industrial facilities has received less attention than the energy sector in the path towards decarbonisation up to now. Therefore, this chapter presents ... [more ▼]

Mitigation of carbon dioxide emissions from industrial facilities has received less attention than the energy sector in the path towards decarbonisation up to now. Therefore, this chapter presents potential measures to reduce CO2 emissions through the conversion of CO2 from industrial sources into methanol in order to achieve the targets set by the European Commission. Methanol is easy to synthesise from CO2 and hydrogen and a stable liquid fuel at ambient conditions, which makes it an ideal candidate for long-term storage of electricity from variable renewable sources. If methanol is stored, it could be used to generate electricity when necessary or as transport fuel due to its high octane rating. While Europe’s contribution in the worldwide production is rather modest, Northeast Asia is the largest methanol consumer. In this work, an integrated system is proposed to re-use CO2 emitted from an ammonia plant is converted into methanol. An Aspen Plus model was developed for the three sub-processes; i) CO2 capture of an ammonia plant, that already captures CO2 as part of the hydrogen production stage, ii) water/CO2 co-electrolysis, and iii) methanol synthesis and purification. Heat integration strategies are carried out to improve the process efficiency of the integrated system. This work also discusses current and potential use of CO2 emitted from other industrial sources such as steel mills, ethanol plants and power industry. The future of CO2 conversion into methanol greatly depends on its economics compared to traditional methanol production from fossil fuels. A review of the costs for the CO2-to-methanol process is presented, where it is recognised that projects require a carbon tax to make them financially attractive. The installation of CO2-to-methanol plants could fully replace current importations in Europe, for which only about 11 plants producing each 440 t/year would be needed. A key for the growth of CO2-to-methanol facilities is that the energy required is supplied by renewable energy to truly contribute to the industry decarbonisation. As such, even higher potential is anticipated if methanol is used as a sustainable energy carrier to fulfil the so-called methanol economy. [less ▲]

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See detailSO2 effect on oxidative degradation of monoethanolamine for post combustion CO2 capture
Benkoussas, Hana ULiege; Dubrulle, Louis ULiege; Léonard, Grégoire ULiege

Poster (2018, October 23)

The most conventional amine used in the post combustion capture technology, based on chemical absorption, is monoethanolamine (MEA). Depending on the composition of the flue gas to be treated, several ... [more ▼]

The most conventional amine used in the post combustion capture technology, based on chemical absorption, is monoethanolamine (MEA). Depending on the composition of the flue gas to be treated, several mechanisms of amine degradation occur. This leads to a loss of CO2 absorption capacity and may give rise to products that are environmentally difficult to dispose of. Results from CO2 capture pilot plants showed that oxidative degradation due to the presence of oxygen in the flue gas is the main degradation pathway. Furthermore, MEA degrades when exposed to a flue gas containing an amount of sulfur dioxide (SO2). Until now there is not a clear statement about the effect of SO2 on oxidative degradation of MEA. The goal of this study is to identify the impact of the presence of SO2 on the oxidative degradation of MEA. [less ▲]

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See detailLe rôle clé du CO2 dans la transition énergétique
Léonard, Grégoire ULiege

Conference given outside the academic context (2018)

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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 ▲]

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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 ▲]

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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 ▲]

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See detailCO2 activities at the University of Liège
Léonard, Grégoire ULiege

Scientific conference (2017, September)

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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: 71 (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: 161 (102 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: 75 (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: 75 (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 ▲]

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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: 48 (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: 35 (1 ULiège)