Academic literature on the topic 'Biocarburants – Synthèse (chimie)'
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Dissertations / Theses on the topic "Biocarburants – Synthèse (chimie)":
Ksila, Wafa. "Préparation, caractérisation et réactivité de catalyseurs xerogels et aerogels à base de zirconium, d’aluminium et de porosité contrôlée pour les réactions d’estérification et d’hydrogénation." Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR039.
Zirconium and aluminum oxides are materials of great thermal stability under different conditions and have a surface with modulable acid-base sites. The modification of these oxides by an oxo-anion, by an acid and / or metallic function gives them more stability, inhibits sintering and develops the acidity of their surface and consequently they can be used in several catalytic reactions as active phase or support.The work of this thesis focuses on the synthesis, characterization and upgrading of two types of xerogels and aerogels catalysts based on zirconium and aluminum oxides. Telluric acid was chosen as a modulator of the acidity of supports based on zirconia and alumina. Nickel was combined with telluric acid to make nickel tellurium phases on these supports, allowing the isomerization reaction.In a first part, xerogels and aerogels catalysts based on zirconia and alumina doped with telluric acid were synthesized by the “sol-gel” route then characterized and tested in the esterification reaction of acetic acid by benzyl alcohol as a model reaction for the synthesis of biodiesel. A kinetic and mechanistic study as well as the determination of the thermodynamic quantities for the esterification reaction were carried out in the presence of the catalyst having the best catalytic performance.The second part of this thesis focuses on the synthesis of zirconia and alumina-based xerogels and aerogels catalysts doped with telluric acid and nickel nitrates in one-pot, always synthesized by the "sol-gel" route. These catalysts were characterized and then tested in the isomerization hydrogenation reaction of 1-hexene as a model reaction for gasoline reformulation. We will show that the presence of nickel in the preparation prevents the formation of a Zr-Te phase, characterized on the support alone modified by telluric acid
Bidange, Johan. "Valorisation de bio-ressources par catalyse au ruthénium." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S181/document.
In the context of depletion of crude oil, the production of bio-fuels and raw materials from renewable resources for the chemical industry is a topic of tremendous research. The transformation of fatty acid derivatives was developed by using olefin metathesis, using ruthenium catalysts. Short nitriles as kerosene additives and monomers for the polymer industry were synthesized. Purification of the renewable feedstock was studied. A simple thermal treatment was found to promote an increased efficiency for cross-metathesis reactions with fatty acid derivatives. Finally, the synthesis of new second generation ruthenium complexes with a chelating indenylidene ligand was investigated for the development of active and robust catalysts for olefin metathesis reactions
Labidi, Sana. "Elaboration des nanoparticules d'oxyde de zirconium par voie sol-gel : mise en forme et application pour la synthèse de biodiesel." Thesis, Sorbonne Paris Cité, 2015. http://www.theses.fr/2015USPCD085/document.
In this work, we have realized novel nanoparticulate catalysts ZrO₂-SO₄²⁻ for biofuel production. We have studied nucleation-growth kinetics of zirconium-oxo-alkoxy (ZOA) nanoparticles in the sol-gel process. The monodispersed nanoparticles of 3.6 nm diameter were realised in a sol-gel reactor with rapid (turbulent) micro-mixing of liquid solutions containing ZNP and H₂O in 1-propanol at 20°C. The nanocoatings were realised of stable colloids of ZOA nanoparticles on silica beads along with common powders obtained after precipitation of unstable colloids. The acid ZrO₂-SO₄²⁻" catalysts were prepared after drying at 80°C, wet impregnation in 0.25 mol.L⁻¹ aqueous solution of sulfuric acid and subsequent thermal treatment between 500 and 700°C and studied with BET, DTA-DSC, TEM, DRIFT, elemental analysis, DRX and other methods. The catalyst nanocoatings calcinated at 580°C showed strong activity in esterification reaction of palmitic acid in methanol at 65°C, which is about 50 times higher than that of nanopowders, and also possesses the highest stability towards recycling. Tha catalytic performance of catalytic nanocoatings was also confirmed on unedible and waste oils
Hadj, Ali Kamal. "Etude cinétique de l'oxydation et de l'auto-inflammation en milieu gazeux homogène pauvre et ultra pauvre de carburants de substitution issus de la biomasse." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2007. http://tel.archives-ouvertes.fr/tel-00498160.
Neveux, Laure. "Étude de la cinétique et du mécanisme de sulfuration de ZnO par H2S." Phd thesis, Ecole Nationale Supérieure des Mines de Saint-Etienne, 2011. http://tel.archives-ouvertes.fr/tel-00785650.
Reports on the topic "Biocarburants – Synthèse (chimie)":
Fontecave, Marc, and Candel Sébastien. Quelles perspectives énergétiques pour la biomasse ? Académie des sciences, January 2024. http://dx.doi.org/10.62686/1.