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Academic literature on the topic 'Carbure de molybdène'
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Journal articles on the topic "Carbure de molybdène"
Decroix, G. M., D. Gosset, B. Kryger, and M. Boussuge. "Le cermet carbure de bore-molybdène : une solution pour l’amélioration des propriétés thermomécaniques du carbure de bore." Revue de Métallurgie 91, no. 9 (September 1994): 1367. http://dx.doi.org/10.1051/metal/199491091367.
Full textJia, Xiao Ming, Jian Xiao Lian, Qiao Yang, and Xiu Ling Zhang. "Experimental Study on Tungsten Leaching from Cemented Carbide." Advanced Materials Research 189-193 (February 2011): 494–97. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.494.
Full textGhazi, M., J. C. Ménézo, and J. Barrault. "Hydrogénation du Monoxyde de Carbone: I - Étude de catalyseurs Nickel-Molybdène supportés par l'alumine." Bulletin des Sociétés Chimiques Belges 100, no. 6 (September 1, 2010): 433–39. http://dx.doi.org/10.1002/bscb.19911000602.
Full textYin, Chengyang, Jing He, and Shuang Liu. "A facile one-step synthesis of molybdenum carbide-carbon composites for the hydrogenation of naphthalene." Journal of Chemical Research 44, no. 9-10 (April 8, 2020): 609–12. http://dx.doi.org/10.1177/1747519820914471.
Full textBarrault, Joël, and Julien Urresta. "Hydrogénation du dioxyde de carbone en méthanol en présence de catalyseurs à base de molybdène." Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry 2, no. 3 (March 1999): 167–74. http://dx.doi.org/10.1016/s1387-1609(99)80060-7.
Full textMyachina, Maria, Natalia Gavrilova, Ksenia Poluboyarinova, and Victor Nazarov. "Properties of Molybdenum–Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides." Materials Proceedings 4, no. 1 (November 11, 2020): 1. http://dx.doi.org/10.3390/iocn2020-07894.
Full textAhmed, Ahmed N., Aysar T. Jarulah, Ban A. Ahmed Altabakh, Abdullah M. Ahmed, and Hamin J. Mohammed. "Preparation and Characterization of Metal Carbide Zeolite Composite Catalyst." Journal of Petroleum Research and Studies 13, no. 4 (December 12, 2023): 115–30. http://dx.doi.org/10.52716/jprs.v13i4.737.
Full textKushkhov, Kh B., R. Kh Karatsukova, M. N. Ligidova, A. A. Khotov, Zh Z. Ali, Z. A. Zhanikaeva, and M. Kh Marzhokhova. "Electrodeposition of Submicro- and Microdispersed Molybdenum Carbide Powders from Carbonate–Molybdate Melts." Russian Metallurgy (Metally) 2022, no. 2 (February 2022): 57–64. http://dx.doi.org/10.1134/s0036029522020094.
Full textKushkhov, Kh B., R. Kh Karatsukova, M. N. Ligidova, A. A. Khotov, Zh Z. Ali, Z. A. Zhanikaeva, and M. Kh Marzhokhova. "Electrodeposition of Submicro- and Microdispersed Molybdenum Carbide Powders from Carbonate–Molybdate Melts." Russian Metallurgy (Metally) 2022, no. 2 (February 2022): 57–64. http://dx.doi.org/10.1134/s0036029522020094.
Full textGhazi, M., and J. Barrault. "Hydrogénation du Monoxyde de Carbone II - Influence du support et du cesium sur les propriétés du Nickel-Molybdène." Bulletin des Sociétés Chimiques Belges 100, no. 7 (September 1, 2010): 511–15. http://dx.doi.org/10.1002/bscb.19911000704.
Full textDissertations / Theses on the topic "Carbure de molybdène"
Oudghiri-Hassani, Hicham. "Réactivité de la surface de carbure de molybdène ß-Mo¦2C." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ49115.pdf.
Full textLucazeau, Emmanuelle. "Contribution à l'étude de la formation du carbure de molybdène sur le diamant." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0110.
Full textFortin, Carole-Anne. "Étude des carbures de molybdène en deux dimensions en vue d'applications catalytiques." Master's thesis, Université Laval, 2018. http://hdl.handle.net/20.500.11794/31889.
Full textIn recent years, researchers have been very interested in the use of renewable energies, mainly those from biomass. Thisis very promising for the chemical industry, which in two easy steps can transform cellulosic material residues (rich in xylose) into furfural. From furfural, it is possible to synthesize products applicable in various fields, such as biofuels, chemical industry orherbicides. However, the high cost of noble metal catalysts essential, to obtain products of interest, reduces the use of this biomass. In the present case, the work focusses on the characterization of a less expensive alternative, namely transition metal carbides (TMCs), particularly two-dimensional molybdenum carbides (α-Mo2C). These are very promising because of their ability to combine both the properties of transition metals and those of ceramics. They also have catalytic properties similar to those of noble metals, such as platinum and palladium in heterogeneous catalysis. At present, very little information is available in the literature, which limits this alternative. The main goal of this project is studying the surface properties of α-Mo2C2D crystalliteson a copper substrate, with a view to their use in heterogeneous catalysis. For example, an α-Mo2C catalyst can be used to selectively remove oxygen or to perform hydrogenation reactions, which is agreenerand low-costmethod, to produce compounds of interest. Various techniques for cleaning samples of α-Mo2C/Cu were attempted. In addition, the results of several reactants adsorbed on α-Mo2C/Cu are presented in order to probe the reactivity of the 2D samples. One particularly interesting molecule studiedis furfural, a major product of biomass.
Dupont, Colin. "La réaction d'ouverture de cycle de la tétraline sur des catalyseurs à base de carbure de molybdène : effet de l'acidité du support." Paris 6, 2012. http://www.theses.fr/2012PA066391.
Full textSelective ring opening reaction is, nowadays, the most efficient process to reach the current European Union specifications concerning diesel fuel cetane number (CN>51). The yield of this reaction is improved by using catalysts that possess both Brønsted acid sites and metallic sites. In the present work, bifunctional catalysts were synthesized with molybdenum carbide (Mo2C, metallic function) combined to acidic supports, whose acidity (strength and number) was varied: a commercial amorphous aluminosilicate, two zeolites (NaHY, beta) and two mesoporous materials (Al-MCM-41 synthesized from the assembly of preformed zeolite precursors (ZSM-5, beta) around a template). The metallic and the acidic properties were respectively studied by CO chemisorption and FTIR (CO at low temperature, pyridine). The structural properties of the supports and the catalysts were also characterized (XRD, TEM, N2-sorption). The bifunctional catalysts were tested for tetralin hydroconversion in the presence of 50 ppm of S at 350°C and 35. 5 bars. From the catalytic results and careful products identification, realized by 2D-GC, different reaction schemes were drawn. In the presence of Brønsted acid sites (medium or strong) and metallic sites (Mo2C<20 wt %), significant selective ring opening reaction yields are obtained (15% over 9. 5% Mo2C/MCM-41(beta)) but the products remain aromatic (and hence, low CN). At high Mo2C content (Mo2C>80 wt %), hydrogenation and isomerization reactions are favored at the expense of ring opening
Sosa, Letícia. "Hydrodésoxygénation du furfural en 2-methylfurane à l’aide de catalyseurs à base de carbures de molybdène." Electronic Thesis or Diss., Centrale Lille Institut, 2023. http://www.theses.fr/2023CLIL0004.
Full textMolybdenum carbides were synthesized, characterized, and evaluated for the hydrodeoxygenation reaction of furfural to 2-methylfuran at 30 bar of H2 and 200 °C in 2-butanol and cyclopentyl methyl ether. In this thesis, several factors concerning the nature of carbides were evaluated: (i) the effect of crystallographic phases (α-MoC and β-Mo2C); (ii) the effect of the addition of Ni and Cu promoters; (iii) the effect of passivation and reactivation; (iv) effect of support (SiO2, TiO2, ZrO2, ZSM-5). The results show that the β-Mo2C phase is more active than the α-MoC phase, but the same distribution of products is observed in iso-conversion. The addition of Ni and Cu had a positive and negative effect, respectively, on the carbide activity. Different degrees of oxidation occurred during the passivation of carbides, which was related to their dispersion and reactivation did not regenerate them. The different supports mainly affected the first step of the reaction, as well as the final state of the Mo carbides
Cédat, Denis. "Études expérimentale et numérique du comportement mécanique d’un composite métal : céramique : MoTiC30%t." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1093.
Full textIn the scope of refractory materials development for structural applications in the core of the future nuclear reactors, several studies have been developed. The aim of this work is to increase the knowledge of the mechanical behaviour and the damage of the ceramic-metal composite Mo(TiC)x% under the temperature range [25 – 700 °C]. The identification of the third phase, formed by diffusion during the sintering step was identified by microstructutal characterization. Experimental study also revealed the percolation of the ceramic particles through the structure. Mechanical tests highlight the main characteristics of the material: the macroscopic behaviour depends on the strain rate on the first hand and the temperature on the other hand. These mechanisms are attributed to the thermally activated behaviour of molybdenum. Simulations have been made on several microstructures considering elastic-brittle inclusion in a viscoelastic matrix. A polycrystalline model was used to simulate the evolution of the mechanical behaviour of the composite. The numerical aggregate, used for the simulation, was built from a 3D reconstruction technique thanks to acquisition of FIB/EBSD/SEM data
Puricelli, Sophie. "Elaboration, caractérisation et études des propriétés catalytiques de matériaux carbonés poreux et fonctionnalisés par du molybdène." Nancy 1, 2001. http://www.theses.fr/2001NAN10203.
Full textPreparation and characterization of a new catalyst designed for hydrotreating petroleum feedstocks are described in the present work. Blocks maded of compressed expanded graphite are impregnated by polyfurfuryl alcohol, pyrolyzed and activated. These successive steps lead to monoliths whom structure corresponds to a thin active carbon layer deposited on a highly porous graphite backbone. Their elastical and conducting properties are described at each step of their preparation. Given their surface microporosity, these monoliths are quite good catalyst supports. Impregnation with MoCl5 (either in liquid or in vapor phase) followed by a subsequent carburization leads to a phase which is much better dispersed than in three other active carbons studied for comparison. The monoliths thus exhibit a high activity in HDN of indole and quite promising performances in HDS of dibenzothiophene
Morin, Cynthia. "Étude de l'adsorption du cyclohexane et du cyclohexanone sur une surface polycristalline de carbure de molybdène, ß-Mo¦2C." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ49040.pdf.
Full textKertous, Leila. "Ouverture de cycle de la tétraline sur des carbures de molybdène supportes dans les conditions d’hydrotraitement." Paris 6, 2009. http://www.theses.fr/2009PA066743.
Full textBasso, Stéphan. "Etude de l'aromatisation du méthane sur catalyseurs à base de carbure et oxycarbure de molybdène et de tungstène supportés sur zéolithes." Université Louis Pasteur (Strasbourg) (1971-2008), 2001. http://www.theses.fr/2001STR13156.
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