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Дисертації з теми "Procédé Fischer-Tropsch":
Renaud, Nicolas. "Hydroisomérisation de n-paraffines : valorisation des effluents du Procédé Fischer-Tropsch." Montpellier 2, 2006. http://www.theses.fr/2006MON20188.
Fischer-Tropsch process allows to obtain high quality lubricant bases and clean fuels from natural gas. In this goal, the n-paraffins produced have to be upgraded through a hydroconversion step aiming the isomerization of chains. In order to better understand the mechanisms involved, different bifunctional catalysts have been studied for the hydroconversion of n-hexadecane on a lab-scale trickle bed reactor. These catalysts are : a benchmark Pt/EMT, two commercial catalysts (Pt-Pd/SiO2-Al2O3), tungstated zirconias, as well as a new class of mordénite-based micro/mesoporous composite catalyst. A specific study highlighted the effects of mechanical treatments on activity and selectivity of tungstated zirconias. Relations between physico-chemical characterizations of the catalysts and their activities and selectivities for the hydroconversion of n-hexadecane were established
Lu, Mengnan. "New technology development for advanced "Clean" solid catalysts for Fischer-Tropsch synthesis." Thesis, Lille 1, 2015. http://www.theses.fr/2015LIL10108.
Fischer–Tropsch (FT) synthesis converts syngas into liquid hydrocarbons over cobalt catalyst for new ultraclean alternative fuels. The syngas can be produced from both fossil and renewable resources. The catalysts for FT synthesis are currently prepared by chemical ways like impregnation etc. All these routes involve toxic solvents and high temperature retreatment. Because of lower cost, reduced energy requirements and environmental pollution, the mechano-chemistry has a number of advantages for the synthesis of heterogeneous catalysis compared to conventional techniques. In this study, the mechano-chemical method was used to prepare alumina supported cobalt catalysts for FT synthesis. Differently to the conventional catalyst preparation, the deposition of active phase did not involve any solvent in the proposed method. The goal of this work is to obtain efficient FT catalysts and to simplify catalyst synthesis by reducing the number of preparation steps. The project involves innovative method of synthesis of catalysts in three different mechanical working processes in dry context. The process of mechano-chemistry to synthesize the catalyst for FT reaction was developed. The operating conditions for the control of the coating technique were identified through optimal conditions study by statistical analysis. Moreover, characterizations were studied to understand the basic mechanisms behind deposition of particles on the interface. Catalytic performance tests were estimated in a mili-fixed bed reactor; Optimization algorithm of parameters in a mechanical process was carried out via deriving target formula about energy and material size
Léonard, Stéphan. "Synthèse de Fischer-Tropsch en réacteur à alimentations séparées." Compiègne, 2001. http://www.theses.fr/2001COMP1359.
Norelus, Wesley. "Etude théorique de la réaction de fischer-tropsch : l'effet du support." Paris 6, 2013. http://www.theses.fr/2013PA066430.
The goal of this work is to study the well-known support effect in catalysis taking as an example the Fischer-Tropsch catalysis. We use a TiC(100) surface to support a an iron cluster, Fe4. When iron atoms are adsorbed, they tend to form a plat cluster and not to spread off along the surface. Carbon monoxide adsorption is modified by the support: the interaction strength between CO and the iron cluster is indeed larger in the presence of the support. In the case of supported cluster, C-O bound is more elongated, which shows an activation of CO. Then, the dissociation energy barrier for CO dissociation should be smaller on a supported Fe4 cluster than for free cluster. In addition, this study allows us to show that in our system, depending on the used functional, results can be different but the trends stay the same
Anfray, Jérôme. "Acquisition des données pour la modélisation d'une colonne à bulles Fischer-Tropsch." Lyon 1, 2005. http://www.theses.fr/2005LYO10249.
Barbier, Arnaud. "Préparation de nouveaux catalyseurs Co-SiO2 et réactivité en synthèse Fischer-Tropsch." Lyon 1, 1998. http://www.theses.fr/1998LYO10177.
Bedel, Laurent. "Structure et réductibilité de pérovskites La-Co-Fe : Application à la synthèse Fischer-Tropsch." Université Louis Pasteur (Strasbourg) (1971-2008), 2002. http://www.theses.fr/2002STR13075.
The FTS is one of the most interesting way to valorize the natural gas. After reforming the natural gas toward syngas (CO+H2), this process leads to the obtainment of sulfur-free hydrocarbons catalyzed by Coʿ and/or Feʿ. In this work, both Co and Fe have been integrated in a perovskite-type structure well known for its flexibility. LaCoxFe1-xO3 series was prepared by a sol-gel like method. Depending on the Co content x, perovskites crystallize either in the orthorhombic system if x<0. 5 or in the Rrhombohedral one if xđ0. 5. The reduction process study of these materials revealed that their partial reduction is possible and that only the orthorhombic perovskites allow the formation of Coʿ particles. During the reducing treatment the initial oxide crystalline structure is preserved. The extractable metal amount can be enhanced either by decreasing the calcination temperature of the raw oxide or by introducing, when preparing, a lanthanum deficiency in order to generate some defects in the crystalline lattice. The study by XRD and Mössbauer spectroscopy of the La(1-y)Co0. 4Fe0. 6O3-d series pointed out a core-shell phenomenon. The perovskite B cation excess is rejected through Fe as small size cores of g-Fe2O3 (cubic). On these cores crystallizes by epitaxy a cubic Co-rich perovskite-type phase without any La-deficiency. The partial reduction at 450ʿC of these nano-composites remains possible and generates a (Co-Fe)0 alloy in which the iron comes from the g-Fe2O3 cores reduction. An iron enrichment of the perovskite phase is observed during the reducing treatment. The partially reduced oxides catalytic reactivity has been studied under pressure with an on-stream set up. Catalysts are very selective toward light olefins formation, have a remarkable life time and produce a very few CO2 amount
Karaca, Héline. "Propriétés catalytiques et versatilité des catalyseurs à base de cobalt lors du procédé Fischer-Tropsch." Thesis, Lille 1, 2010. http://www.theses.fr/2010LIL10070/document.
This PhD thesis focuses on the investigation of different phenomena which occur during activation of the industrial catalysts for Fischer-Tropsch synthesis and during the reaction under realistic conditions. The first approach was to study the impact of different operational and structural parameters on the catalytic performances. Various ex-situ characterization techniques combined with catalytic tests uncovered a few correlations between the catalyst structure and operating conditions. Nevertheless, because of limitations of ex-situ characterization, there remained a lack of information on the evolution of catalyst structure during the reaction. Then, an innovative operando study of the evolution of catalyst structure under reaction conditions in the Fischer-Tropsch process, which represents a significant experimental challenge due to the severe reaction conditions (high temperature, high pressure, multiphase environment ...), has fill this information gap.This work has finally revealed the significant versatility of studied solids in the Fischer-Tropsch process, and provided new insights into understanding catalyst activation and deactivation phenomena such as cobalt reduction/oxidation, sintering or carbidization of the metallic phase often discussed in the literature
Chakkingal, Anoop. "Réglage de la sélectivité de la synthèse Fischer-Tropsch : aperçu de la modélisation microcinétique et de l'apprentissage automatique." Electronic Thesis or Diss., Centrale Lille Institut, 2022. http://www.theses.fr/2022CLIL0015.
Striving towards a circular economy has led to the re-investigation of many existing processes, with the target of developing more sustainable variants. In our present economy, plastics form an important and omnipresent material affecting our daily lives. They are inexpensive, durable, corrosion resistant, and light weight leading to their use in a wide variety of applications.Within the plastic chemical recycling scheme, Fischer-Tropsch synthesis (FTS) could play a key role as the syngas feedstock that is converted in it, can be generated via the gasification of the considered plastics. This syngas is then chemo-catalytically converted into hydrocarbons such as paraffins and light olefins. Typical FTS catalysts are based on supported cobalt or iron species.Among the mechanistic kinetic models, the comprehensive variant based on the Single Event MicroKinetics (SEMK) concept has been widely applied in the field of oligomerization, autoxidative curing, etc. and has proven to be a versatile tool to simulate Fischer-Tropsch synthesis. However, developing mechanistic models for every chemical engineering challenge is not always feasible due to their complexity and the in-depth knowledge required to build such models.A detailed evaluation on the potential of using machine learning approaches to match the performance of results obtained using the Single-Event MicroKinetic model was carried out. Initially, the focus was on a single dominant output scenario (methane selective catalyst). The current work thus shows that more widely applied techniques in data science can now be applied for systematic analysis and interpretation of kinetic data. Similar analysis using experimental data can also help experimenters in their preliminary analysis, to detect hidden trends in the data, and thus to identify importance features. After gaining confidence on the investigated interpretation techniques, for the FTS reaction with single dominant output, a similar investigation on the potential of iron based catalysts with enhanced light olefin selectivity is carried out next
Tymowski, Benoît de. "Fischer Tropsch synthesis on conductive silicon carbide based support." Thesis, Strasbourg, 2012. http://www.theses.fr/2012STRAF019/document.
The Fischer-Tropsch synthesis (FTS) allows the transformation of a mixture of synthesis gas, i.e. H2 and CO, into valuable liquid hydrocarbons. The catalysts generally used in FTS are based on iron or cobalt supported on alumina or silica. ln the present work, silicon carbide (SiC) has been proposed as a replacement media to traditional supports. The results obtained indicate that the mesoporous SiC containing cobalt catalyst exhibits a good FTS activity and an extremely high selectivity towards liquid hydrocarbons compared to other FTS catalysts supported on alumina or silica. The FTS activity on the Co/SiC catalyst can be improved by changing the impregnation solvent or by promoting the cobalt phase with trace amount of noble metal. The doping of the SiC support with Ti02 phase also significantly improves the FTS activity keeping a similar high selectivity thanks to the formation of small cobalt particles in contact with the Ti02 phase
Книги з теми "Procédé Fischer-Tropsch":
Klerk, Arno de. Catalysis in the refining of Fischer-Tropsch syncrude. Cambridge: RSC Publishing, 2010.
Occelli, Mario L., and Burtron H. Davis. Fischer-Tropsch Synthesis, Catalysts and Catalysis. Elsevier Science & Technology Books, 2006.
Furimsky, Edward, James J. Spivey, and Arno de Klerk. Catalysis in the Refining of Fischer-Tropsch Syncrude. Royal Society of Chemistry, The, 2010.
Occelli, Mario L., and Burtron H. Davis. Fischer-Tropsch Synthesis, Catalysts, and Catalysis: Advances and Applications. Taylor & Francis Group, 2016.
Occelli, Mario L., and Burtron H. Davis. Fischer-Tropsch Synthesis, Catalysts, and Catalysis: Advances and Applications. Taylor & Francis Group, 2016.
Occelli, Mario L., and Burtron H. Davis. Fischer-Tropsch Synthesis, Catalysts, and Catalysis: Advances and Applications. Taylor & Francis Group, 2016.
Occelli, Mario L., and Burtron H. Davis. Fischer-Tropsch Synthesis, Catalysts, and Catalysis: Advances and Applications. Taylor & Francis Group, 2019.