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Roukoss, Charbel. "Développement de catalyseurs hétérogènes à base de fer pour l'époxydation des oléfines". Lyon 1, 2006. http://www.theses.fr/2006LYO10147.
Prados-Ramirez, Maria-José. "Étude des réactions avec l'hydrogène d'éther-oxydes alkyl-aromatiques sur des catalyseurs à base de fer et de molybdène". Lille 1, 1990. http://www.theses.fr/1990LIL10084.
Bachir, Redouane. "Modification de catalyseurs d'hydrogénation à base de palladium par dépôt de fer en sous-tension". Poitiers, 1995. http://www.theses.fr/1995POIT2316.
Oberson, Michèle. "Etude des mécanismes d'hydroliquéfaction du charbon en présence de catalyseurs au fer, au molybdène et à l'étain". Lyon 1, 1987. http://www.theses.fr/1987LYO15887.
Mauvezin, Mathias. "Réduction catalytique de N2O par NH3 sur catalyseurs à base de zéolithe bêta contenant du fer". Montpellier 2, 2000. http://www.theses.fr/2000MON20098.
Aleboyeh, Hamid. "Contribution à l'étude de l'hydrogazéification des matériaux carbones en présence de catalyseurs à base de fer". Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb37602203f.
Goupil, Danièle. "Hydrogènation sélective de l'aldéhyde cinnamique en alcool cinnamique en présence de catalyseurs platine-fer déposés sur charbon". Lyon 1, 1986. http://www.theses.fr/1986LYO10090.
Faye, Jérémy. "Oxydation du phénol en milieu aqueux par le peroxide d'hydrogène en présence d'oxydes de type pérovskite à base de fer". Poitiers, 2007. http://www.theses.fr/2007POIT2296.
According to the drastic environmental legislation, advanced oxidation processes have been developed to satisfy the objectives in water depollution. Among these new technologies, catalytic wet hydrogen peroxide oxidation process allows to perform oxidation of organic pollutants in ambient conditions. The homogeneous Fenton system (Fe2+/H2O2), applied to industrial wastewater decontamination, could be advantageously improved by using stable heterogeneous catalysts more suitable for environmentally friendly processes. In this respect, perovskite type oxides (formula ABO3) behave as excellent candidates for the stabilization of the transition metal cation within the crystal structure, thereby limiting leaching of the active phase (i. E. Fe3+). In this work, a series of iron-based perovskites AFeO3 (with A = La, Nd, Pr, Sm, Y) was prepared by two different synthesis procedures, fully characterized and tested for the wet peroxide oxidation of phenol in aqueous solution. Relationship between the perovskites catalytic activity and stability and their physico-chemical properties (reducibility and textural characteristics) is highlighted. The most efficient catalysts were selected based on their ability to completely oxidize the organic pollutant in CO2 and on their stability in aqueous solution. A second series of non stoichiometric iron-based perovskites with general formula A1-xFeO3-δ (A = La, Pr and Sm and x = 0, 0. 1, 0. 2, 0. 3, 0. 4) was prepared in order to modulate the iron reducibility inside the perovskite network. The influence of this parameter on the catalytic activity was determined for various oxidation reactions in aqueous solution (phenol) and in gas phase (methane)
Bordet, Alexis. "Une nouvelle génération de nano-catalyseurs à base de carbure de fer pour le stockage chimique de l'énergie". Thesis, Toulouse, INSA, 2016. http://www.theses.fr/2016ISAT0017/document.
After several decades of oblivious fossil resources consumption, humanity is now facing major issues regarding global warming and energy production and storage. In the double context of intermittent renewable energy storage and CO2 recovery, the power-to-gas approach, and especially the Sabatier reaction (catalytic hydrogenation of carbon dioxide to methane + water) is of special interest. The main goal of this thesis is to perform the Sabatier reaction using magnetically activated nano-catalysts. The use of magnetic nanoparticles to convert electromagnetic energy into heat is indeed an approach of growing interest in catalysis, even if the field of biomedicine obviously concentrate most of the applications (magnetic hyperthermia, drug delivery, etc.). In this respect, the interest of the synthesized nanoparticles for biomedical applications is studied and discussed. We describe herein a pathway to iron carbide nanoparticles allowing a fine tuning of their carbon content and magnetic properties. We show that the carbon content and the crystallinity of the synthesized nanoparticles greatly impact their magnetic heating efficiency. The Fe2.2C crystallographic phase especially appears to be the key to highly enhanced specific absorption rates (SARs). We took advantage of these exceptional heating properties to investigate the Sabatier reaction in a continuous flow reactor, the catalyst being activated through magnetic induction. The SAR of synthesized iron carbide nanoparticles appeared to be sufficient to reach the temperature required for the activation of the Sabatier reaction (typically > 250°C), and promising results were obtained in a continuous flow reactor. We were thus able to demonstrate that the concept of magnetically induced catalysis can be successfully applied to the CO2 methanation reaction and represents an approach of strategic interest in the double context of intermittent energy storage and CO2 valorization
Kribii, Abdelaziz. "Préparation, caractérisation et désactivation de catalyseurs à base de cuivre". Poitiers, 1987. http://www.theses.fr/1987POIT2009.
Abdellaoui, Mohammed. "Oxydation de composés organiques par le peroxyde d'hydrogène en milieu aqueux en présence d'argiles pontées [Fe-Al] ou [Cu-Al]". Poitiers, 1999. http://www.theses.fr/1999POIT2339.
Langpape, Martin. "Etude de l'oxydation ménagée de l'isobutane en acide méthacrylique sur des catalyseurs à base d'hétéropolyanions : influence des contre-ions césium, fer et cuivre". Lyon 1, 1997. http://www.theses.fr/1997LYO10260.
Bheeter, Linus Paulin. "catalyseurs à base de ligands carbène N-hétérocycliques dérivés de fer et de nickel pour les réactions catalytiques d'hydrosilylation et d'hydroboration". Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S182.
The research work described in this manuscript has for main objective the development of new homogeneous catalytic systems based on N-heterocyclic carbene (NHC) iron and nickel complexes for hydrosilyation and borylation reactions. The first chapter describes the use of [Cp(NHC)Fe(CO)₂][X] (X = I, PF₆) complexes bearing benzimidazole or imidazole NHC type ligands for hydrosilylation of benzaldehyde and acetophenone. In a second chapter, we have shown that half-sandwich NHC-nickel complexes in the presence of a catalytic amount of NaHBEt3 can be efficient catalysts for the reduction of aldehydes, ketones, aldimines and ketimines in the presence of diphenylsilane. In the last chapter, two new series of non-classical NHC-nickel triazole complexes had been developed: (i) one series with half sandwich NHC-nickel triazole complexes and (ii) another one based on chelating anionic amido-functionalized N-heterocyclic carbene nickel complexes. The two series of complexes were then evaluated in catalytic borylation cross coupling reaction
Belaroui, Lala Setti. "Préparation et caractérisation des argiles à piliers mixtes Al-Fe et leurs applications comme catalyseurs dans la réaction d'oxydation de Baeyer-Villiger et extension à d'autres catalyseurs à base de fer". Lyon 1, 2008. http://www.theses.fr/2008LYO10051.
The present study concerns the valorization of algerian clay’s from Maghnia city. The purification treatment realized on the natural clay allowed to eliminate a significant number of impurities and to confirm that it is a montmorillonite type clay named Lalithe with a bedeillitic character. The preparation of the clay pillared with Fe led to delaminated clay but when the clay was pillared with Al-Fe starting with chlorhydrol as aluminium source. A stable pillared-clay presenting reproducible textural and structural properties was obtained. The characterization of three series of pillared compounds showed that with the polycation Al13 as source of aluminium iron could also be inserted and Al-Fe mixed pillars Al-Fe with an optimum quantity of aluminium of 10 mmol/g of clay obtained. Mössbauer spectroscopy showed a possible substitution of aluminium by iron in the polycation Al13. Baeyer-Villiger oxidation of cyclohexanone to caprolactone was studied with Al-Fe pillared Clays using oxygen as oxidantive agent. A complete conversion was observed with a high selectivity. The reaction was indeed catalyzed by dissolved iron cations and the catalysis of the reaction of oxidation of Baeyer-Villiger should be considered as homogeneous. However, it has been shown that the reaction could be carried out in heterogeneous phase not in the presence of pillared clays but with a new catalyst corresponding to iron phthalocyanine supported on silica and leading to a selectivity in caprolactone higher than 95% for a cyclohexanone conversion of 60 %. The characterization of the reaction medium after catalytic test enabled to confirm that the iron phthalocyanine grafted on silica was a true heterogeneous catalyst, which opens new prospects for research with the use of these synthetic pigments as intercalating agent in the smectites for applications in the reaction of Baeyer-Villiger
Mennad, Abdelkader. "Préparation et caractérisation des catalyseurs au nickel et au fer-nickel : étude de leur activité catalytique dans la réaction d'hydrocondensation du monoxyde de carbone". Lyon 1, 1986. http://www.theses.fr/1986LYO10520.
Lulizi, James Aluha. "Synthèse Fischer-Tropsch à base température pour la production de carburants synthétiques sur des catalyseurs nanométriques de fer et de cobalt supportés par le carbone". Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10161.
Abstract : This work reveals the potential plasma technology presents in producing highly active catalysts for Fischer-Tropsch synthesis (FTS), while simultaneously contracting catalyst production into a single step, which is a certain departure from the traditional multi-step methods such as impregnation or precipitation. Novel catalysts proposed were carbon-based, developed from single metal (Fe/C, Co/C) to bimetallic (Co-Fe), ternary (Mo-Co-Fe, Ni-Co-Fe) and then the promoted Au/Ni-Co-Fe formulations. Since the preparation of nanometric carbon-supported catalysts by plasma is a relatively new phenomenon, it offers the Fischer-Tropsch catalysis prospects of future commercial applications, because of the high temperatures that are achieved in plasma create Fe carbides (Fe3C, Fe5C2), which are assumed to account for Fe-based FTS catalysis. An attempt to fully quantify the carbide phases in the samples by X-ray diffraction (XRD) and Rietveld Quantitative Analysis (RQA) was only partially successful due to the nanometric nature of the materials existing below the instrument’s detection limits. With BET specific surface areas of 35–93 m2.g-1, the catalysts were found to be non-porous, a characteristic that is advantageous because Fischer-Tropsch reaction would operate away from mass transfer limitations. Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) coupled with Energy Dispersive X-ray Spectroscopy (EDX) and X-ray mapping indicated high dispersion of the metal moieties in the carbon matrix, with no signs of nanoparticle agglomeration both in the fresh and used samples. Raman and X-ray Photoelectron Spectroscopy (XPS) characterized the support as highly graphitic, mixed with amorphous carbon arising from substantial defects in the graphite. Evidence from X-ray Absorption Spectroscopy (XAS) using X-ray Absorption Near Edge Structure (XANES) analysis confirmed that plasma synthesized Co/C catalyst contained some carbides (Co3C), which went undetected by XPS. Initial catalyst testing was performed in the fixed-bed reactor at 503 K (230C), 3 MPa pressure, and gas hourly space velocity (GHSV) of 6 000 〖cm〗^3 〖.h〗^(-1).g^(-1) of catalyst for 24 h. Elaborate tests were further executed in a 3-phase continuously stirred-tank slurry reactor (3-φ-CSTSR) isothermally operated between 493–533 K (220–260°C) at 2 MPa pressure, and GHSV = 3 600 〖cm〗^3 〖.h〗^(-1).g^(-1) of catalyst, for 24 h. It was observed that all catalysts were active for FTS, producing both gasoline and diesel fractions, but selectivity depended on the amount of metal in the catalyst or the reaction conditions. The most active catalyst at 493 K was the plasma-synthesized Co/C that showed 40% CO conversion, which was benchmarked against the commercial Fe/C at 32%. This performance was compared to the plasma-synthesized Fe/C (25% CO conversion) and 80%Co-20%Fe/C (10% CO conversion), while both the 50%Co-50%Fe/C and 30%Co-70%Fe/C were inactive. The plasma-synthesized Co/C was also more selective towards the gasoline fraction, but at 533 K it generated excessive CH4 (46%) and CO2 (19%) prompting the development of the Co-Fe/C bimetallics, which exhibited less than 10% selectivity towards CH4 or CO2 at over 40% CO conversion. Similarly, Ni-containing catalysts (Ni-Co-Fe/C) were relatively more active than the bimetallics, exhibiting over 50% CO conversion with higher selectivity towards the gasoline fraction (38%) than towards diesel (20%). The Ni-Co-Fe/C catalysts also produced excessive CH4 (23%) and CO2 (14%), than the Co-Fe/C bimetallics. Overall, the Co-Fe bimetallics and the acidified Co-Fe catalyst (i.e. Mo-Co-Fe/C) were more selective towards diesel formation (~55%). When the effect of pre-treatment medium was investigated, depending on catalyst composition, the CO-reduced catalysts showed enhanced selectivity for diesel fraction (50–67%) than catalysts reduced in H2 (45–55%). In addition, it was observed that catalysts containing high concentration of Co as well as those reduced in H2 generated more H2O than those reduced in CO, and the presence of Au (that is, in Ni-Co-Fe/C) not only depressed the Ni-Co-Fe/C catalyst activity, but it also lowered its capacity to form H2O, although it had no significant impact on the catalyst’s hydrocarbon selectivity.
Abou, Serhal Cynthia. "Oxydation totale des Composés Organiques Volatils (COV) sur des catalyseurs à base de métaux de transition préparés par voie hydrotalcite : Effet des micro-ondes sur la méthode de synthèse". Thesis, Littoral, 2018. http://www.theses.fr/2018DUNK0529/document.
This work aims to study the catalytic oxidation of Volatile Organic Compounds (VOCs). The main objective is to find catalytic materials that are alternatives to very expensive noble metals. The search for transition metal based catalysts is investigated. Furthermore, to improve the catalytic performance of the transition metals, their dispersion must be optimized using an adequate synthetic method. The various prepared solids were characterized by different physicochemical techniques : X-ray Diffraction (XRD), Thermal Analysis (TDA/TGA), Infrared Spectroscopy (IR), Temperature Programmed Reduction by hydrogen (H₂-TPR), Scanning Electron Microscopy (SEM), X-ray Photoelectron Spectroscopy (XPS)...Moreover, the obtained oxides were tested in the total oxidation of the VOC propene. Firstly, we focused our work on the preparation of a series of Co/Fe hydrotalcites -like samples by the traditional co-precipitation method. This study consists mainly of evaluating the substitution of bivalent and trivalent cations. It has been found that the solid containing both cobalt and iron (CoFe) has the highest catalytic activity. The interest of the hydrotalcite route compared to other methods of synthesis, such as the classical method and the mechanical mixing of oxides was put into evidence. Secondly, the use of microwave irradiation during the synthesis of hydrotalcite materials has also been studied as an unconventional method of synthesis. A beneficial effect has been observed with the use of microwaves due mainly to higher specific surface areas and better reducibility of the oxide species. In addition, an optimization of the temperature, duration, and power of the microwave irradiations was carried out on the CoFe solid, in order to show the influence of each parameter on the physico-chemical properties of the materials. Thirdly, the synthesis of a series of hydrotalcite catalysts with different ratio of Co²⁺ and Fe³⁺ was carried out. The influence of the molar ratio on the hydrotalcite structure has been shown. A comparison between these solids and those prepared by the microwave method was also discussed
Schön, Anke. "Development of alternative 3-way catalysts : Fe-based perovskites with low noble metal content". Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10030.
This study aims at developing alternative 3-way catalysts (TWC) for the exhaust gas treatment ofspark-ignition engines. Petrol engine exhaust comprises carbon monoxide, hydrocarbons and nitrogenoxides (NOx) which need to be eliminated simultaneously. The partial replacement of platinum groupmetals (PGM) which are nowadays used as TWC active phase was intended. To this end, Fe-basedperovskites were investigated. The main drawback of PGM is their scarcity which leads to high environmental, societal and economic exploitation and usage cost. The stability of PGM nanoparticles which tend to sinter during catalyst operation and the N2 selectivity during NOx reduction also deserve improvement. 3-way catalytic reactions have been performed on LaFeO3-based perovskites in complex feed streams containing all 3 kinds of pollutants and other naturally present gases such as O2 and H2 and high amounts of inhibitors (CO2, H2O). To improve results of the LaFeO3 perovskite, 2 approaches – textural properties and composition optimisation – were studied. Textural properties could be improved by optimising synthesis parameters such as the employed solvent and the calcination atmosphere. Interesting NOx reduction results were obtained by changing the calcination atmosphere during LaFeO3 synthesis. Surface and bulk composition optimisation lead to significantly enhanced catalytic performances. Furthermore, an increased N2 selectivity is observed compared to a commercial reference catalyst. Thedoping with low PGM content lead to enhanced performances which were increased by a reductivepre-treatment
Zivkov, Catherine. "Etude de catalyseurs a base d'argiles et d'argiles a piliers pour la methanisation du gaz de synthese". Poitiers, 1987. http://www.theses.fr/1987POIT2205.
Bertho, Sylvain. "Fonctionnalisation d’énamides par voie radicalaire : Catalyse au fer ou application de la chimie des xanthates". Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2060.
The aim of the thesis is to study the addition of radical species on non-aromatic enamide scaffolds in order to access high molecular diversity of cyclic and acyclic nitrogen-containing compounds in a restricted number of steps via sustainable eco-friendly regio- and diastereoselective reactions.Firstly, non-aromatic enamides bearing different functional groups have been synthesized. Then a regio- and diastereoselective iron-catalyzed oxyazidation of enamides was developed in the presence of novel azidobenziodoxolones (ABX) derivatives under mild reaction conditions. In addition, the versatility of the trans α-azido β-esters piperidines was highlighted by the synthesis of various original nitrogen-containing polycycles.Subsequently, C3 alkylation of enamides with α-halogenocarbonyles. was carried out through an iron (II)-catalysis or a metallic iron-mediated process.Finally, radical xanthate chemistry was applied to achieve the metal-free alkylation of the C3 position of enamides or the difunctionalization of enamides in the presence of a nucleophile
Borowiec, Anita. "New acrolein production route starting from alcohols mixtures over FeMo-based catalysts". Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10153/document.
Acrolein is the simplest unsaturated aldehyde, which - due to its high reactivity - finds applications as an intermediate in the chemical industry (e.g., for acrylic acid and methionine production). Recently, a worldwide demand increase of acrolein derivatives was observed, which is expected to continuously grow within the next years. However, nowadays acrolein is commercially obtained by propylene oxidation, where the raw material comes from fossil resources. This work proposes a new method of acrolein production starting from renewable feedstock – methanol and ethanol mixture. This reaction was approached by reaction conditions optimization (i.e. Design of Experiment method do decrease the number of catalytic tests and save time), FeMoOx modifications (e.g. various Mo/Fe ratios, calcination temperature, and basic elements addition) and a second catalyst utilization (e.g. single commercial oxides and silica-based materials) in order to balance the acid base properties
Dhainaut, Fabien. "Réduction des oxydes d'azote par l'hydrogène sur des catalyseurs à base de métaux nobles supportés". Lille 1, 2006. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/1f52f3af-74fd-4a68-b6f3-013c99de06b5.
Rosell-Laclau, Eliette. "Addition d'éléments de transition dans les alliages Al-Ni précurseurs des catalyseurs de nickel de Ranay". Grenoble INPG, 1994. http://www.theses.fr/1994INPG0071.
Mrad, Raya. "Etude de la dégradation catalytique simultanée de NOx/COV sur des oxydes mixtes à base de cuivre et de fer". Thesis, Littoral, 2016. http://www.theses.fr/2016DUNK0422.
This thesis was done within the politics of reducing the emissions of toxic gases such as volatile organic compounds (VOC) and nitrogen oxides (NOx). This study aimed to optimize efficient catalysts, prepared in the absence of noble metals, for the simultaneous elimination of VOC (propylene) and NOx under excess of oxygen (lean condition). Hydrotalcite solids were chosen because of the interesting properties of the oxides obtained by their calcination. Two treatments were performed : on the one hand the propylene oxidation alone, on the other propylene oxidation and NOx reduction simultaneously. Cu, Mg and Al - based catalysts were prepared by the hydrotalcite route. The as-prepared solids were proven to be efficient in the NOx reduction due to the presence of small aggregates of well dispersed CuO on the surface. However the CU²⁺ ions in the forms of crystallites were active in the propylene reaction. In order to improve the catalytic activity, Fe element was then incorporated into the solids to substitute a part or all of the Al element and the effects were studied. In the selective catalytic reduction of NOx by the C₃H₆ the introduction of iron species into the structure lowered the temperature of complete C₃H₆ conversion but also reduced the NOx conversion. Moreover, in order to improve the NOx conversion, the catalyst that exhibited the best reduction of NOx was promoted by alkaline letals. Cs and Na showed a promoting effect while K displayed an inhibotory effect. Finally, an introduction to soot oxidation and the simultaneous elimination of propylene and NOx in the presence of soot was conducted. Another part of this work concerned atmospheric particles collected in Lebanon during dust-rich days originating from the Arabian Desert. Transformations in the morphology and chemical composition of aerosols were assessed by Scanning Electron Microscopy (SEM) equipped with an Energy Dispersive X-ray system. The results showed that coarse particles are rich in metal oxides (Si, Al, Mg, Fe, Ca...). However, over fine and ultrafine particles, the formation of organonitrates and organosulfates oligomers was observed. Yet, organonitrates sprung from the reaction between VOC and NOx
Nguyen, Thi Quyen. "Développement de photoélectrodes hybrides via l'assemblage d'un photosensibilisateur à base de ruthénium et d'un nanocatalyseur métal-oxyde métallique pour la génération d'O2 solaire". Thesis, Toulouse 3, 2021. http://www.theses.fr/2021TOU30046.
In this work, different nanostructured catalytic systems have been synthesized by an organometallic approach to produce nanoparticles (NPs) of small size and narrow size distribution, and their catalytic activity in the water oxidation reaction has been evaluated. First Fe NPs stabilized by oleic acid were synthesized that displayed an average size of ca. 10 nm ± 1.1 nm. A gamma-Fe_2O_3 oxide layer ca. 2.6 nm thick has been formed at their surface to obtain Fe@FeOx core-shell structure of ca. 11.5 ± 2.3 nm in diameter. Despite their hydrophobicity, these nanoparticles showed good electrocatalytic activity in alkaline conditions. As the gamma-Fe_2O_3 oxide shell is well adapted to the grafting of phosphonic groups, these Fe@FeOx NPs were grafted with different aminophosphonic acids in order to transfer them into water. Preliminary assessment of their catalytic activity showed improved activity for the NPs functionalized by 3-aminopropylphosphonic acid which opens promising prospects. Subsequently, a Ru-phenanthroline light-harvester with a pendant phosphonate group was synthesized and grafted onto the Fe@FeOx core/shell NPs to afford a novel hybrid photoanode for solar-driven water splitting. Mono- and biphasic processes were investigated to graft the Ru-complex at the surface of the NPs. The monophasic process was found to be more efficient as it provided a higher grafting density at the surface of the NPs (respectively 56 and 9 Ru per nanoparticles for the mono and biphasic processes). Photoelectrochemical measurements showed that the hybrid nanocatalyst comprising the highest Ru content was ca. 9-fold more catalytically active than a simple mixture between a ruthenium polypyridyl photosensitizer bearing no grafting group and the Fe@FeOx nanoparticles, and 40-fold more active than the pristine Fe@FeOx NPs. The performance enhancement could be attributed to a more efficient electron transfer between the ruthenium polypyridyl photosensitizer and the Fe@FeOx water oxidation catalyst thanks to the covalent bonding between these two components. The covalent grafting was found to improve not only the photocatalytic activity but also the stability of the system. Finally, amorphous NiFe NPs (diameter ca. 4 nm) with two different ratios between Ni and Fe (Ni_0.5Fe_0.5 NPs and Ni_0.68Fe_0.32 NPs) were synthesized, oxidized in air and grafted with 3-aminopropylphosphonic acid in order to obtain hydrophilic systems. The electrocatalytic activity of these water-soluble NPs was studied in alkaline solution, in comparison with that of crude NiOx NPs, FeOx NPs, and Ni_0.1Fe_0.9Ox NPs. The water soluble NPs containing 32 % of Fe (Ni_0.68Fe_0.32Ox) showed the highest activity and a good durability in alkaline solution. These characteristics make these amorphous NPs potentially applicable in photoelectrochemical cells for water splitting
Bouslama, Mohamed. "Elaboration de nouveaux catalyseurs nanostructurés à base de sol de TiO₂ immobilisés dans un matériau monolithique ultraporeux d'alumine". Paris 13, 2013. http://scbd-sto.univ-paris13.fr/secure/edgalilee_th_2012_bouslama.pdf.
This PhD work aims to explore the possibility of immobilization of TiO₂nanoparticles in different classes of ultraporous monolithic alumina and inspect their photocatalytic activities. The alumina monoliths are obtained by oxidation of alumina with atmospheric air and at room temperature. After development and consolidation by chemical and / or thermal treatments different substrates are obtained which differby their allotropic properties, microstructure and specific area. The preparation of photocatalyst is made according to a sol-gel process from the precursor: titanium tetra-isopropoxyde (TTIP). It is performed by a sol-gel reactor with rapid micromixing and in-situ particules granulometry contol. Immobilization of oxo-TiO₂ nanoparticles is carried out in the same reactor by impregnating alumina monoliths. Subsequent heat treatments lead to anatase nanoparticles of titanium dioxide. The structural characteristics of nanocoatings were studied by X-ray diffraction, N₂ adsorption, scanning and transmission electron microscopy. The photocatalytic decomposition of a model pollutant (ethylene) was carried out in a fixed bed tubular reactor. Studies of influence of processing temperature on size and allotropic form of TiO₂ immobilized on different types of substrates are detailed in this work. The impact of structural and allotropic properties on the photocatalytic activity is discussed, highlighting the role of the alumina substrates in the stabilization of the most active TiO₂ polymorph in photocatalysis: anatase
Nguyen, Thanh Binh. "Oxydation totale du chlorobenzène et du trichloroéthylène sur catalyseurs à base de palladium déposé sur supports oxyde". Lille 1, 2006. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/c02f619b-2dbd-46f6-981b-89b966c13f55.
Majesté, Labourdenne Annie. "Etude de la réactivité et de la nature des espèces actives dans l'oxydation en milieu aqueux du phénol par le peroxyde d'hydrogène, en présence de catalyseurs à base de fer déposé sur support carboné". Poitiers, 2000. http://www.theses.fr/2000POIT2296.
Dumeignil, Franck Payen Edmond Grimblot Jean. "Catalyse et environnement". Villeneuve d'Ascq : Université des sciences et technologies de Lille, 2007. https://iris.univ-lille1.fr/dspace/handle/1908/177.
Synthèse des travaux en français et curriculum vitae. Recueil de publications en anglais non reproduit dans la version électronique. N° d'ordre (Lille 1) : 501. Titre provenant de la page de titre du document numérisé. Bibliogr. 5 p. Liste des publications et des communications.
Zair, Leïla Fournier Michel. "Oxydation sélective de l'isobutane en acide méthacrylique sur des composés molybdo-vanado-phosphoriques influence de la texture sur les performances catalytiques /". [S.l.] : [s.n.], 2003. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2003-157-158.pdf.
Plazenet, Guillaume Payen Edmond. "Catalyseurs à base de molybdène supporté sur alumine [gamma] et zéolithe HY caractérisation des phases oxydes et sulfures /". [S.l.] : [s.n.], 2001. http://www.univ-lille1.fr/bustl-grisemine/pdf/extheses/50376-2001-121-122.pdf.
Barrios, Medina Alan Josue. "Synthèse Directe d'Oléfines Légères par des Réactions d'Hydrogénation du CO et du CO2". Electronic Thesis or Diss., Centrale Lille Institut, 2021. http://www.theses.fr/2021CLIL0030.
CO and CO2 Hydrogenation are an attractive way to convert non-petroleum and renewable feedstocks such as biomass, plastic and organic waste into fuels and chemicals. Activity, selectivity to light olefins and stability are major challenges of these reactions over Fe catalysts. In this thesis, we synthesized different iron-based catalysts for both CO and CO2 hydrogenation in order to get highly selective, active and stable catalysts. For CO hydrogenation SiO2 was used as support while for CO2 hydrogenation reaction ZrO2 supported catalysts presented the most encouraging results. We relied on High Throughput Experimentation (HTE) to identify among 27 promoters the most efficient ones for FT synthesis at the same time that different selectivity trends were evaluated. HTE tests allowed us to clearly identify Sn, Sb, Bi and Pb as the most promising promoters in order to obtain Fe catalysts with higher activity in FT synthesis. Then, we focused on studying the strong promoting effects of Sb and Sn on the catalytic performance of SiO2 supported iron Fischer Tropsch catalysts using a combination of advanced and in-situ techniques. TEM in the activated FeSn/SiO2 catalyst showed highly dispersed Sn nanoparticles on the silica support. On the other hand, activated FeSb/SiO2 catalyst showed a core-shell morphology. Additionally, smaller amount of carbon deposition detected is crucial for better stability of the Sn- and Sb-promoted catalysts in FT reaction. Finally, we focused on the identification of efficient promoters for ZrO2 supported iron catalysts in CO2 hydrogenation reaction. We observed the most pronounced increase in the reaction rate for the K and Cs promoted catalysts. HTE clearly showed that the presence of K was essential to achieve higher light olefin selectivity. Additionally, Mo, Cu, Cs, Ce and Ga were identified as possible promoters to further increase the selectivity of CO2 hydrogenation to this fraction. The work performed during this thesis allowed to design new catalysts for CO and CO2 hydrogenation reaction that could be easily implemented at industrial level. Catalysts studied for both reactions showed improvement three key aspects: activity, selectivity, and stability
Bento, Carvalho Alexandre Antônio. "Investigation of intrinsic activity of cobalt and iron based Fischer-Tropsch catalysts using transient kinetic methods". Thesis, Lille 1, 2017. http://www.theses.fr/2017LIL10116/document.
The work exposed in this manuscript concerns the study of the intrinsic activity and localization of active sites in cobalt and iron based catalysts using a combination of transient kinetic methods such as SSITKA, extended physicochemical characterization and catalytic tests under quasi steady state conditions. Promotion of iron catalysts with metals used for soldering (Bi and Pb) results a remarkable increase in the light olefin production rate with the possibility to conduct Fischer-Tropsch synthesis at very mild reaction conditions (low pressure) and even at atmospheric pressure. Transient kinetic experiments showed facilitation of CO dissociation in the presence of promoters by scavenging O atoms from iron carbide. Cobalt catalyst supported by mordenite zeolite presented higher value of SSITKA rate constant. Localization of cobalt active sites in bifunctional cobalt-zeolite catalysts has a major impact on the reaction rate and in particular on the hydrocarbon selectivity. A proximity between the cobalt active site and Bronsted active sites was found to be a key parameter to obtain higher selectivity and yield of isomerized hydrocarbons. SSITKA combined with catalyst characterization revealed that carbon deposition and cobalt nanoparticle agglomeration were responsible for the deactivation of silica supported cobalt catalysts. Catalyst rejuvenation in hydrogen lessened the amounts of deposited carbon species and partially released the most active sites of carbon monoxide dissociative adsorption and stronger sites of carbon monoxide reversible adsorption
Twagirashema, Ivan. "Fonctionnement des catalyseurs à base de palladium au cours de la réduction de NO par l'hydrogène : apport des spectroscopies in situ et operando". Lille 1, 2006. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/6d9a01a8-4454-41d6-8cd8-27b6f6cef02f.
Schifano, David. "Étude des mécanismes de base de la dégradation chimique de l'acide nitrilotriacétique, ligand utilisé dans les procédés redox de conversion d'H2S en soufre élémentaire". Lille 1, 2004. https://pepite-depot.univ-lille.fr/RESTREINT/Th_Num/2004/50376-2004-143.pdf.
Berges, Julien. "Formation de liaisons C-C et C-N par catalyse au Cuivre, au Fer ou en absence de metal de transition". Thesis, Montpellier, Ecole nationale supérieure de chimie, 2016. http://www.theses.fr/2016ENCM0014.
This thesis is part of a very general search seek to develop methodologies for environmentally sustainable conversion of small molecules into more valuable substances catalyzed by copper and iron complexes or under metal-free conditions. The work focuses on the functionalization of aromatic rings by C-C or C-N bond formation.In a first chapter, a novel coupling involving an aryldiazonium salt and a nitrogenous nucleophile (CAr-N bond formation) is first described. The method proceeds under mild conditions using a cheap and non-toxic copper catalyst system. The obtained coupling products (Ar-NHet) are of central interest in the pharmaceutical and agrochemical industry. Then in a second part, a method allowing the coupling between aryldiazonium salts and styrene derivatives, using a BuOK / DMF system is presented. This reaction, carried out for the first time in the absence of catalysts based on transition metals, makes it possible to access to various stilbene units which find numerous applications in pharmaceutical chemistry.A second chapter concerns the use of hypervalent iodine derivatives allowing the functionalization of aromatic or vinyl substrates. A first method describes a direct triflimidation reaction of acetanilide compounds with an exclusive selectivity in the para position. Two reactions conditions have been established for this functionalization. One uses a stoichiometric amount of PhI(OAc)2 and another uses a catalytic amount of iodotoluene (in-situ generation of iodine (III)). This transformation resulted in the formation of CAr-N bonds in the presence of lithium bis (trifluoromethane) sulfonimide (LINTf2) as the nitrogen nucleophile. In a second part, we have shown that bisphosphoranilidene iodide (PNPI) can catalyze a selective vinylic trifluoromethylation of styrene derivatives in the presence of a hypervalent iodine reagent (iodine (III)), Togni’s reagent II. Work is under way to try to understand the positive influence of PNPI.A third chapter describes preliminary results of an iron-catalyzed heterocoupling of 4-iodotoluene an phenylithium system allowing the obtention of an honorable yield (54%) during the coupling of 4-iodotoluene with phenyllithium. Another series of tests describes the coupling between aryl halides and primary alkyllithiums. The method seems to be very effective, since very recent work in the literature for similar couplings involving the same reaction partners involves catalysts of iron or palladium
Hashmi, Obaid Hasan. "Engineering of iron-based polymerization catalysts : towards the design of original multi-structured thermoplastic (co) polymers". Electronic Thesis or Diss., Université de Lille (2018-2021), 2021. http://www.theses.fr/2021LILUR022.
A series of iminopyridine-/iminoquinoline-based ligands L1-L11 of type 11-[(Ar)N=C(R)]-R’ (Ar = 2,6-Me2-C6H3 or 2,6-iPr2-C6H3 or 3,5-(CF3)2-C6H3 or C6F5, R = H or Me and R’ = 2-C6H5N or 2-C6H4N-5-Me or 2-C9H7N or 8-C9H7N) and their corresponding iron (II) complexes were developed. The complexes were fully characterized including by X-ray for new complexes (6-11) and their catalytic applications were investigated for the controlled coordinative polymerization of isoprene. The modulation of steric and electronic properties within this family of ligands/complexes has shown to influence the stereo-selectivity and activity of the polymerization of isoprene after activation with various cocatalysts. The resulting catalysts produced polyisoprenes with an excellent conversion, high activity and a variety of stereo-/regio-regularities. Some of these catalysts were also assessed for the coordinative polymerization of styrene and displayed good activity for the formation of syndiotactic enriched polystyrenes. Another organometallic methodology has been utilized for the synthesis of aminopyridine ligands (rac-L1H and rac-L2H) and their corresponding iron amide complexes 12 ((L1)2Fe), 13Py and 14Py (LnFe[N(SiMe3)2](Py)) for their application in the Ring-Opening (Co)polymerizaion of L-lactide and ε-caprolactone where the complexes 13Py and 14Py proved to be effective
Coutelier, Olivier. "Synthèse de nouveaux complexes de tungstène : application à la métathèse d'alcynes terminaux". Lille 1, 2005. https://ori-nuxeo.univ-lille1.fr/nuxeo/site/esupversions/8541b04c-19ea-4546-aef6-f89031e7be75.
Bencheikh, Moulay Abdelkébir. "Réactions de l'anisole avec l'hydrogène sur catalyseurs au fer". Lille 1, 1988. http://www.theses.fr/1988LIL10055.
Bencheikh, Moulayab Delkebir. "Réactions de l'anisole avec l'hydrogène sur catalyseurs au fer". Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb37611785z.
Kermagoret, Anthony Braunstein Pierre. "Synthèse de nouveaux complexes de nickel et de fer application en catalyse d'oligomérisation de l'éthylène /". Strasbourg : Université Louis Pasteur, 2007. http://eprints-scd-ulp.u-strasbg.fr:8080/820/01/kermagoret2007.pdf.
Agostini, Giorgio. "Etude de catalyseurs d'hydrotraitement a base d'uranium". Strasbourg 1, 1986. http://www.theses.fr/1986STR13026.
Agostini, Giorgio. "Etude de catalyseurs d'hydrotraitement à base d'uranium". Grenoble 2 : ANRT, 1986. http://catalogue.bnf.fr/ark:/12148/cb37595337f.
Martinho, Marlène. "Complexes de fer mononucléaires non hémiques : modèles de catalyseurs d'oxydation biologiques". Paris 11, 2006. http://www.theses.fr/2006PA112151.
This work deals with the synthesis and characterization of model complexes of mono- and dioxygenases. The complexes used are Fe(II) complexes with aminopyridin ligands. The reactivity of these complexes upon addition of oxidants (H2O2, mCPBA) has been studied in order to observe reactional intermediates. Chapter I reviews the natural systems and model compounds known in literature. A new Fe(IV)=O complex has been obtained (chapter II). It has been characterized by UV-Vis absorption, FT-IR in solution and by SQUID and mossbauer spectroscopy on the powder sample. The exchange of the oxygen atom with water has been highlighted by ESI-MS and FT-IR measurements. A complementary of the well complex [(L52)Fe(III)(OOH)]2+ has been done (chapter III). The EPR spectra in solution display the signals of two low spin Fe(III) species. The g values of these species are very close. We propose that the solution contains two Fe(III)-OOH species with different orientation of the hydroperoxo group. The intermediate has also been obtained as a powder. The characterization of this powder is still under study in the laboratory. New Fe(II) complexes hav been synthesized with a new ligand which bears a pivaloylamine arm (chapter IV). This function offers a rich coordination chemistry. The reactivity of these complexes with H2O2 has been studied (chapter V). A new Fe(III)-OOH complex has been obtained and characterized by UV-vis absorption, EPR and resonance raman spectroscopy. This study shows that the ligand is coordinated to the iron centre by 4 nitrogen atoms and the oxygen atom from the pivaloylamio arm. A spontaneous equilibrium between the Fe(III)-OOH and the Fe(III)-(eta2-OO) species has also been observed. Finally, the reaction of the Fe(II) complex with dioxygen, in presence of reductants and protons in acetonitrile, leads to the Fe(III)-OOH complex. This intermediate evolves into a green Fe(III) species, which appears to be Fe(III) peroxo species based on resonance raman spectroscopy
Corrias, Massimiliano. "Nouvelle classe de catalyseurs pour la production massive en lit fluidisé de nanotubes de carbone multi-parois". Phd thesis, Toulouse, INPT, 2005. http://www.theses.fr/2005INPT010G.
The work presented in this manuscript concerns the study of a novel class of iron based catalysts for the massive and selective production of multi-walled carbon nanotubes (MWNT) by a fluidised bed catalytic chemical vapour deposition reaction. We have at first tuned the process which we have used to prepare some Fe/Al2O3 catalysts. These catalytic systems have then been characterised and used with success for the synthesis of MWNT. After the tuning of the parameters that control the production process we have realised a first scale-up and optimised the catalytic systems in order to maximise the productivity on nanotubes. Promising results have been obtained with high loadings of metal and the crucial role of the carbon saturation on the germination of MWNT has been evidenced. Finally we propose an explanation on the behaviour of this type of catalysts during the growth of multiwalled carbon nanotubes
Corrias, Massimiliano. "Nouvelle classe de catalyseurs pour la production massive en lit fluidisé de nanotubes de carbone multi-parois". Phd thesis, Toulouse, INPT, 2005. http://oatao.univ-toulouse.fr/7125/1/corrias_partie_1_sur_2.pdf.
Lator, Alexis. "Métalloenzymes artificielles et nouvelles réactivitées des complexes de fer". Thesis, Normandie, 2018. http://www.theses.fr/2018NORMC256.
Environmental and economic concerns within modern chemistry (waste management, atom economy), lead metal-catalyzed reduction of polarized C=X bonds (X= O, N) with organometallic complexes an important reaction in organic chemistry. Additionally, stereo-, regio- and chemoselective reductions can be involved in organometallic catalysis. In the past decade, cyclopentadienone iron tricarbonyl complexes were reported as efficient for the hydrogenation of C=O and C=N bonds. According to previous investigations in the group, we developed a new approach within artificial metalloenzyme involving iron complexes for the hydrogenation of polarized bonds. Simultaneously, we described new reactivities of the complex prepared in the group for ketone alkylation and amine methylation through auto-hydrogen borrowing process, and chemoselctive C=C bonds of enones. We developed as well a new aminocyclopentadienyl iron complex for the enhancement of reductive amination previously described
Tardy, Marie-Claire. "Combustion du méthane sur catalyseurs à base d'oxydes". Lyon 1, 1990. http://www.theses.fr/1990LYO10002.
Thiollier, Anne. "Catalyseurs d'hydrotraitement à base de sulfure de chrome". Lyon 1, 1999. http://www.theses.fr/1999LYO10233.
Tazi, Touria. "Hydrogénolyse d'alcanes sur catalyseurs à base de rhodium". Montpellier 2, 1990. http://www.theses.fr/1990MON20142.