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Rozprawy doktorskie na temat "Carburant solaire"
Favet, Thomas. "Conversion de l'énergie solaire en carburant H2 par photoélectrolyse de l'eau sur des matériaux nanohybrides à base de TiO2/nanoparticules". Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF068.
Pełny tekst źródłaHydrogen is an attractive non-carbonaceous storable fuel. A promising approach for clean and sustainable hydrogen production is solar driven photoelectrochemical water-splitting. This project aims to modify the properties of TiO2 used as a photoanode, in order to enhance the photoelectrochemical hydrogen production. Designing TiO2 at the nanometric scale with nanotubes is an interesting way to enhance both its reactivity and spatial separation of photogenerated carriers. A co-alloying strategy was investigated. The large introduction of anions (N3-) and cations (Nb5+,Ta5+) in the lattice was found to be an efficient way to reduce the band gap energy of TiO2, allowing absorption of photons in the visible range. A parametric study on the pulsed laser deposition of co-catalysts (cobalt, nickel) on TiO2 NTs was performed. The chemical composition of the co-catalysts can be controlled with the background atmosphere used during the deposition. Under the optimal conditions determined after this study, a significant improvement of photoelectrochemical hydrogen production under both solar and visible light was reached. Combining the co-alloying approach and the co-catalysts deposition leads to tripling the hydrogen production under solar light. In order to have a better understanding of the mechanisms involved, more specific studies have been performed
Curcio, Axel. "Simulation dynamique et contrôle d'un gazéifieur continu pour la production de carburants solaires". Electronic Thesis or Diss., Perpignan, 2023. https://theses-public.univ-perp.fr/2023PERP0035.pdf.
Pełny tekst źródłaThis thesis tackles the optimization of a spouted-bed reactor, for the solar gasification of biomass (beech wood pellets). The syngas synthesized is notably useful for the production of alcohols and fuels. Integrating solar heating enables decarbonating the process, which is usually autothermal. This means that one third of the initial feedstock is usually burnt to heat the reactor, and that the producer gas is contaminated.Various gasifier designs have been assessed experimentally since the 1980s, showing promising energy efficiencies. Some theoretical works were also carried out to tackle the practical application of the technology in industrial processes. In particular, the fluctuations of sunlight availability must be managed, by proposing thermal storage and hybridization methods. The solar-autothermal hybridization – which relies on in situ oxygen injection – is an interesting solution, and will be tackled all through the present thesis.Firstly, the experimental setup (1.5 kWth) is detailed. Preliminary experiments with continuous injection are carried out, to better characterize the reactions of wood pyrolysis and char gasification. Via comparative studies, the impacts of the cavity’s layout on gasification results are described (indirect heating through an emitter plate, inert particles bed, cylindrical confiner). A dynamic simulation code is eventually developed in PYTHON, to model the impact of reactants feeding rates on transient outcomes. This code couples heterogeneous kinetics, corresponding to char-gas reactions, with the computation of thermodynamic equilibrium in the gas phase. The related hypotheses enable reducing the computational costs.Secondly, the solar-autothermal hybrid process is described. Experimental results are exploited, to quantify the negative impact of O2 injection on the producer gas quality (H2 and CO yields). Control strategies are then proposed to mitigate these effects, via the controlled injection of biomass or water throughout hybridization. A constant H2+CO production strategy is retained for the following, and is assessed through a parametric study in PYTHON. The impacts of hybridization on the walls temperature and syngas composition are discussed.Thirdly, the PYTHON code is applied to the hybrid gasifier dynamic control, in order to establish yearly production reports. An upscaled reactor is considered (10 MWth), with controlled H2+CO volume production and reactants temperature. Parametric studies are performed regarding the control code tuning, and the impact of design parameters on the hybrid gasifier performances. Finally, the relevance of the model assumptions is discussed.7The present thesis thus proposes a precise hybridization strategy (constant H2+CO production), which aims at facilitating the integration of the solar gasifier in an industrial process. The feasibility of dynamic control on a second-per-second time scale is demonstrated. In a 10 MWth plant around the location of Odeillo (France), the yearly solar heat share might be around 20%. Beyond this point, syngas production is necessarily fluctuating, thus requiring the integration of costly storage facilities. Perspectives are listed to clarify design choices for upscaled hybrid gasifiers
Risal, Laura-Line. "Production d’Hydrogène par Photo-Catalyse de TiO2". Electronic Thesis or Diss., Institut polytechnique de Paris, 2022. http://www.theses.fr/2022IPPAE021.
Pełny tekst źródłaTo circumvent the intermittency of the renewable energies, the use of an energy vector like Hydrogen seems to be an ideal solution. It represents a good way to store energy massively over long periods to be later employed in a wide variety of systems such as mobility, heating or industrial processing, with no impact on the carbon footprint. This source of energy then appears then to be a good alternative to fossil fuels on which we are very dependent. However, 95% of hydrogen is currently produced by the technique of steam reforming of natural gas, which leads to a significant production of carbon dioxide (CO2)! It is therefore necessary to produce it by other techniques and, among the various technologies available, the production by using photocatalysis (a process using only sunlight and water) seems quite appropriate given the possibility of coupling this technique to a renewable energy source such as sunlight. The best-known and most currently used photocatalyst is titanium dioxide (TiO2), but its synthesis requires high temperatures on the scale of several hundreds of degrees. Moreover, its photocatalytic activity is limited and it is generally doped with noble metals in order to increase its photocatalytic power. Given this problem, as part of this doctorate, a new process for TiO2 synthesis under mild conditions at 50°C has been implemented. The materials obtained were then doped with non noble metals such as zinc (Zn), magnesium (Mg), aluminum (Al). Pressure doping tests were also carried out and the hydrogen production results obtained under visible light are very promising
Leveque, Gael. "Production de combustibles solaires synthétiques par cycles thermochimiques de dissociation de l'eau et du CO2". Thesis, Perpignan, 2014. http://www.theses.fr/2014PERP1211.
Pełny tekst źródłaThis PhD thesis focuses on the study of the CO2 and H2O reduction into CO and H2 using thermochemical cycles. These cycles use metal redox pairs for stepwise reduction at lower temperature. The first step consists of the endothermic high temperature reduction of the metal oxide (>1200°C) using concentrated solar energy. The second step, operated at a lower temperature (<1200°C), uses the reduced specie to reduce CO2 or H2O, yielding CO or H2 and regenerating the metal oxide. The CO and H2 mixture (syngas), produced using solar energy, can then be converted into liquid fuel using a conventional Fischer-Tropsch catalytic process. The study considers more specifically the volatile oxide cycles, ZnO/Zn and SnO2/SnO, for which the reduced specie is obtained in gaseous phase at the reaction temperature, and is then condensed as nanoparticles. First, means and methods for studying the kinetics of reduction reactions at high temperatures were developed, namely an inverse method based on the online analysis of O2 production in a solar reactor and a solar-driven thermogravimeter. In addition, the study of reduced pressure operation and the use of a carbonaceous reducer were considered as efficient means to decrease the operating temperature and to promote a fast reaction. The impact of reduced pressure was quantified for SnO2 and ZnO reduction. A study of the evolution of the morphology and chemistry of the SnO powder during the second oxidation step was then conducted, emphasizing the importance of SnO disproportionation on the powder reactivity
Bernadet, Sophie. "Conversion photocatalytique du CO2 sur monolithes poreux". Thesis, Bordeaux, 2018. http://www.theses.fr/2018BORD0172/document.
Pełny tekst źródłaIn the current context of developing novel non-fossil energy sources while minimizing the environmental impact, solar-driven-fuel-production by exploiting anthropogenic CO2 emissions appears to be a solution with great potential. The main challenge in artificial photo-induced processes concerns the two-dimensional character of the systems used, due to the low photon penetration depth. This thesis work focuses on the development of alveolar solid foams, derived from integrative chemistry and bearing a hierarchically organized porosity. By TiO2 precursor impregnation, self-standing photocatalysts were synthesized and provided a photon penetration increase by an order of magnitude. Moreover, these solids limit back-reactions by a dilution effect, while ensuring high selectivity towards alkane generations. A kinetic model, based on a mixed formalism of Langmuir-Hinshelwood and Eley-Rideal, is proposed to describe material behavior
Eskandari, Azin. "A preliminary theoretical and experimental study of a photo-electrochemical cell for solar hydrogen production". Thesis, Université Clermont Auvergne (2017-2020), 2019. http://www.theses.fr/2019CLFAC104.
Pełny tekst źródłaIn order to meet the energy and climate challenge of the coming 21st century, one solution consists of developing processes for producing storable energy carriers by artificial photosynthesis to synthesize solar fuels, in particular hydrogen, in order to valorize the solar resource. The understanding of these processes and the achievement of high kinetic and energetic performances require the development of generic, robust and predictive knowledge models considering radiative transfer as a physical process controlling the process at several scales but also including the various other phenomena involved in the structure or reification of the model.In this PhD work, the photo-reactive process at the heart of the study was the photo-electrochemical cell. More complex than the simple photoreactor, with a photo-anode and a (photo)cathode, the photo-electrochemical cell spatially dissociates the oxidation and reduction steps. Based both on the existing literature (mainly in the field of electrochemistry) and by deploying the tools developed by the research team on radiative transfer and thermokinetic coupling formulation, it was possible to establish performance indicators of photo-electrochemical cells.In parallel to the establishment of this model, an experimental approach was undertaken based first on a commercial Grätzel-type cell (DS-PEC) indicating the general trends of such photon energy converters with in particular a drop in energy efficiency as a function of the incident photon flux density. A modular experimental device (Minucell) has also been developed and validated in order to characterize photo-anodes of different compositions such as chromophore impregnated TiO2 electrodes for operation in Grätzel cells or Fe2O3 hematite electrodes (SC-PEC) where the semiconductor plays both the functions of photon absorption and charge carrier conduction. Above all, the Minucell device allowed to test, characterize and model the behavior of a bio-inspired photo-electrochemical cell for H2 production using at the photo-anode a Ru-RuCat molecular catalyst (developed by ICMMO Orsay/CEA Saclay) and at the cathode a CoTAA catalyst (developed by LCEMCA Brest). Minucell was used to characterize each constituent element of a photo-electrochemical cell and then the cell as a whole confirming the trends and observations obtained on energy efficiencies.This preliminary work opens up a wide range of research prospects, lays common ground between electrochemistry and photo-reactive systems engineering, and provides insights into the design and kinetic and energy optimization of photo-electrochemical cells for the production of hydrogen and solar fuels
Maheu, Clément. "Study of Titania supported transition metal sulfides for the photocatalytic production of hydrogen". Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1172.
Pełny tekst źródłaPhotocatalysis is a promising way to synthesize H2 as a solar fuel. On one hand, the photocatalytic H2 production stores solar energy under chemical energy. On the other hand, it produces H2 with a renewable process using water and bio-based alcohols as a feedstock. This Ph.D thesis aims to study the photocatalytic dehydrogenation of alcohols with transition metal sulfides supported on TiO2 (MSx/TiO2). Those transition metal sulfides have versatile and highly tunable properties. They can activate H2, they have promising electrochemical behavior and optical properties. Seven MSx/TiO2 (M = Co, Ni, Cu, Mo, Ru, Ag, Hg) are therefore studied. The photocatalytic dehydrogenation of propan-2-ol is used as a model reaction. Structure-activity relationships are found between the intrinsic properties of the MSx/TiO2 and their photocatalytic activity. Measuring an apparent activation energy provides additional mechanistic insights. It shows that the photocatalytic production of hydrogen is mostly limited by the charge carrier separation and by the electronic transfer. Therefore a method combining the UPS and the UV-Visbile absorption spectroscopies has been develop to establish the electronic structure of photocatalytic powders. This work concludes that the electronic structure plays a crucial role in photocatalysis. With RuS2/TiO2 photocatalyst, the electron transfer is evidenced as the rate-determining step of the photocatalytic dehydrogenation of propan-2-ol
Villagra, Angel Eduardo. "Photo-dissociation de l'eau et photo-réduction du CO₂ assistées par co-catalyse moléculaire". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS282/document.
Pełny tekst źródłaThe main objective of this research work was to put into evidence the co-catalytic effect of organo-metallic molecular complexes containing transition metals as reactive centers, adsorbed at the surface of doped semiconductors with photo-activity with regard to water photo-dissociation and carbon dioxide photo-reduction, in view of practical applications in photochemistry and photo-electrochemistry. First, appropriate materials (two photoactive semiconductors and two molecular co-catalysts) have been identified and selected (results are presented in chapter I). Then, we have designed, constructed and optimized a specific test bench that can be used for the continuous detection and titration of reaction products (results are presented in chapter II). Product analysis was achieved by coupling a gas-phase chromatograph to the photo-electrochemical reactor. Then, photoactive semiconductors and molecular co-catalysts have been elaborated/synthesized and their intrinsic properties have been measured (results are presented in chapter III). Finally, the co-catalytic activity of molecular complexes has been put into evidence and several performance indicators such as reaction kinetics and turn-over frequency have been measured (results are presented in chapter IV)
Książki na temat "Carburant solaire"
Energy Systems for Electric and Hybrid Vehicles. Institution of Engineering & Technology, 2016.
Znajdź pełny tekst źródłaCzęści książek na temat "Carburant solaire"
ABANADES, Stéphane. "Production de carburants solaires par dissociation thermochimique de l’eau et du CO2". W Le solaire à concentration, 331–58. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9079.ch11.
Pełny tekst źródłaRODAT, Sylvain, i Stéphane ABANADES. "Combustibles de synthèse à partir de ressources hydrocarbonées". W Le solaire à concentration, 311–30. ISTE Group, 2023. http://dx.doi.org/10.51926/iste.9079.ch10.
Pełny tekst źródłaFontecave, Marc. "Chapitre 2 : Photosynthèse artificielle : du CO2 aux carburants solaires". W Chimie et lumière, 37–60. EDP Sciences, 2021. http://dx.doi.org/10.1051/978-2-7598-2508-0.c005.
Pełny tekst źródłaStreszczenia konferencji na temat "Carburant solaire"
Aukauloo, Ally. "S'inspirer de la nature pour produire de l'énergie. Photosynthèse artificielle à l'Université Paris-Saclay". W MOlecules and Materials for the ENergy of TOMorrow. MSH Paris-Saclay Éditions, 2021. http://dx.doi.org/10.52983/nova3845.
Pełny tekst źródłaRaporty organizacyjne na temat "Carburant solaire"
Thees, Oliver, Matthias Erni, Vanessa Burg, Gillianne Bowman, Serge Biollaz, Theodoros Damartzis, Timothy Griffin i in. Le bois-énergie en Suisse: potentiel énergétique, développement technologique, mobilisation des ressources et rôle dans la transition énergétique. Livre blanc. Swiss Federal Institute for Forest, Snow and Landscape Research, WSL, kwiecień 2023. http://dx.doi.org/10.55419/wsl:32793.
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