Literatura científica selecionada sobre o tema "Réaction d'oxydation de l'urée"
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Artigos de revistas sobre o assunto "Réaction d'oxydation de l'urée"
De Laat, J., M. Doré e H. Suty. "Oxydation de S-triazines par les procédés d'oxydation radicalaire. Sous-produits de réaction et constantes cinétiques de réaction". Revue des sciences de l'eau 8, n.º 1 (12 de abril de 2005): 23–42. http://dx.doi.org/10.7202/705211ar.
Texto completo da fonteChamboux, J., V. Viossat, F. Jorand e K. Sahetchian. "Réaction d'oxydation lente de l'hydrogène en présence de dioxide de soufre". Journal de Chimie Physique 82 (1985): 499–503. http://dx.doi.org/10.1051/jcp/1985820499.
Texto completo da fonteDebellefontaine, H., P. Striolo, M. Chakchouk, J. N. Foussard e J. Besombes-Vailhe. "Nouveaux procédés d'oxydation chimique pour l'élimination des rejets aqueux phénolés". Revue des sciences de l'eau 5, n.º 4 (12 de abril de 2005): 555–72. http://dx.doi.org/10.7202/705147ar.
Texto completo da fonteRamirez Zamora, R. M., e R. Seux. "Oxydation du diuron et identification de quelques sous-produits de la réaction". Revue des sciences de l'eau 12, n.º 3 (12 de abril de 2005): 545–60. http://dx.doi.org/10.7202/705365ar.
Texto completo da fonteLahbabi, N. "Synthese et caractérisation de catalyseurs a base de cuivre: application a la réaction d'oxydation du phénol". Annales de Chimie Science des Matériaux 26, n.º 2 (abril de 2001): 23–31. http://dx.doi.org/10.1016/s0151-9107(01)80043-x.
Texto completo da fonteGuittonneau, S., J. De Laat, M. Dore, J. P. Duguet e C. Honnel. "Etude de la dégradation de quelques composés organochlorés volatils par photolyse du peroxyde d'hydrogène en milieux aqueux". Revue des sciences de l'eau 1, n.º 1-2 (12 de abril de 2005): 35–54. http://dx.doi.org/10.7202/705002ar.
Texto completo da fonteDe Laat, J., N. Chramosta, M. Doré, H. Suty e M. Pouillot. "Constantes cinétiques de réaction des radicaux hydroxyles sur quelques sous‐ produits d'oxydation de l'atrazine par O3ou par O3/H2O2". Environmental Technology 15, n.º 5 (maio de 1994): 419–28. http://dx.doi.org/10.1080/09593339409385446.
Texto completo da fonteMeziane, Samia, Pierre Lanteri, Rémi Longeray e Christian Arnaud. "Emploi de l'acide monopersuccinique (PSA) dans l'eau comme agent d'oxydation dans la réaction de Baeyer-Villiger appliquée aux cétones cycliques". Comptes Rendus de l'Académie des Sciences - Series IIC - Chemistry 1, n.º 2 (fevereiro de 1998): 91–94. http://dx.doi.org/10.1016/s1251-8069(97)86266-5.
Texto completo da fonteKarpel Vel Leitner, N., J. De Laat, H. Suty e M. Doré. "Sous-produits de réaction formés lors de la filtration sur charbon actif de composés phénoliques en présence d'ions chlorite". Revue des sciences de l'eau 8, n.º 2 (12 de abril de 2005): 163–81. http://dx.doi.org/10.7202/705217ar.
Texto completo da fonteSahetchian, K., F. FJorand, J. Chamboux e V. Viossat. "Etude de la réaction d'oxydation de l'hydrogène au voisinage de la deuxième limite d'inflammation : mise en évidence de pulsations de pression". Journal de Chimie Physique 85 (1988): 91–96. http://dx.doi.org/10.1051/jcp/1988850091.
Texto completo da fonteTeses / dissertações sobre o assunto "Réaction d'oxydation de l'urée"
Zemtsova, Viktoriia. "Réaction d'oxydation de l'urée sur des électrodes à base de Ni étudiée par spectroscopie électrochimique et in situ". Electronic Thesis or Diss., Strasbourg, 2023. http://www.theses.fr/2023STRAF075.
Texto completo da fonteThe objectives of the work were to unveil the dependence of the activity and the products of the UOR on the structure and composition of Ni-based catalysts. We used operando XAS to investigate both the structure of the catalysts and the mean oxidation state of Ni in Ni, NiCo and NiFe catalysts during their operation, and FTIRS to detect products and intermediates formed during the UOR. The operando FTIR spectroscopy allowed us to detect several urea oxidation products on Ni, NiFe and NiCo electrodes, suggesting that the UOR follows two parallel pathways. The pathway resulting in the carbonate formation (and hence also N2 which cannot be detected with FTIRS) predominates at lower potentials, whereas the formation of nitrite and cyanate increases at higher potentials. The operando XAS measurements at Ni K-edge allowed us to detect formation of NiOOH, and decrease of its fraction in the presence of urea. The results support the EC’ (electrochemical – followed by a chemical step) UOR mechanism operating both for monometallic and for bimetallic catalysts, the role of the second component (Fe, Co) mainly related to its influence on the potential of the Ni(OH)2/NiOOH transition and hence the UOR overpotential
Nhut, Jean-Mario. "Réaction d'oxydation sélective de l'hydrogène sulfuré (H2S) en soufre élémentaire". Université Louis Pasteur (Strasbourg) (1971-2008), 2003. http://www.theses.fr/2003STR13240.
Texto completo da fonteStudies realised on the desulfurisation reaction at high temperature led us to selectively control the active phase location on the support, with the development of a new impregnation method (called bi-phasic impregnation). This method was based on the duality of the SiC surface (hydrophilic, hydrophobic), and allowed to depose the iron oxide particles (active phase) exclusively on pure SiC zones. These zones were proven to be hydrophobic and located on the outer surface of the pores of the material, and then allowed a better accessibility reactant against the active phase. As a function of time on stream the iron oxide based active phase was transformed into an iron oxysulfide phase (T = 230-240 °C). This phase was very active and selective and was extremely stable during the reaction (more than 1000 h of time on stream), whatever the nature of the reaction mixture, i. E. With or without impurities (H2, CO2, SO2, CO, NH3). The discovery of new materials like carbon nanostructures (nanofibers, nanotubes) allowed us to develop new catalysts, based on NiS2, able to selectively oxidize at 60 °C H2S into elemental sulfur with extremely high sulfur yield and high space velocity (WHSV = 0. 03 h-1). The results obtained showed the importance of these supports on the desulfurisation activity and their great capacity of solid sulfur storage. To explain these results on nanotubes, the hypothesis of a confinement effect induced by their tubular morphology was advanced while the high activity observed on the nanofibers composite was attributed to their high external surface due to their nanosize. Moreover, a particular mode of deposition was advanced to explain their activity and their high solid sulfur storage capacity during the reaction (existence of surface duality of the materials: hydrophilic/hydrophobic)
Galant, françois Magda. "Étude cinétique de la réaction exothermique d'oxydation du sulfure de zinc". Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL037N.
Texto completo da fontePetit, Sarah. "Influence de l'incorporation du vanadium dans l'hydroxyapatite sur la réaction d'oxydation déshydrogénante du propane". Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066620/document.
Texto completo da fonteIn order to fill the gap between propene supply and demand, the oxidative dehydrogenation of propane (ODHP) is an alternative solution to the direct dehydrogenation process. Vanadium-modified hydroxyapatites (HAp) are bifunctional catalysts combining acid-base and redox properties which were shown to be of interest for the ODHP reaction. In order to optimize this system, the aim of the work was to investigate the catalytic behavior of the vanadium-modified hydroxyapatites and to establish structure reactivity relationships. By peculiar attention was devoted to the control of synthesis. Provided high pH value is maintained during the synthesis, the Ca10(PO4)6-x(VO4)x(OH)2 solid solution was successfully obtained for x 0→ 6, whereas at lower pH, a mixture of Vx-HAp solid solution and of Ca2V2O7 was obtained from x ≥ 4. For the solid solution, contrary to propene selectivity, the propane conversion does not depend on the vanadium content, unexposed on the surface. The activation of the C-H bond of propane is controlled by an intrinsic properties of the HAp structure, in relation with the thermally activated formation of strong basic O2- anions. Their in situ formation results from the progressive dehydration of OH- columns via an ionic conduction process by protons that is enhanced under catalytic conditions. Due to the tetrameric environment of vanadium in Ca2V2O7 against isolated tetrahedra in the solid solution, redox exchanges are facilitated, improving the selectivity in propene. The intimate contact between the two phases and the formation of a coherent interface leads to an optimal yield in propene, due to synergistic effects of the two phases
Petit, Sarah. "Influence de l'incorporation du vanadium dans l'hydroxyapatite sur la réaction d'oxydation déshydrogénante du propane". Electronic Thesis or Diss., Paris 6, 2017. https://accesdistant.sorbonne-universite.fr/login?url=https://theses-intra.sorbonne-universite.fr/2017PA066620.pdf.
Texto completo da fonteIn order to fill the gap between propene supply and demand, the oxidative dehydrogenation of propane (ODHP) is an alternative solution to the direct dehydrogenation process. Vanadium-modified hydroxyapatites (HAp) are bifunctional catalysts combining acid-base and redox properties which were shown to be of interest for the ODHP reaction. In order to optimize this system, the aim of the work was to investigate the catalytic behavior of the vanadium-modified hydroxyapatites and to establish structure reactivity relationships. By peculiar attention was devoted to the control of synthesis. Provided high pH value is maintained during the synthesis, the Ca10(PO4)6-x(VO4)x(OH)2 solid solution was successfully obtained for x 0→ 6, whereas at lower pH, a mixture of Vx-HAp solid solution and of Ca2V2O7 was obtained from x ≥ 4. For the solid solution, contrary to propene selectivity, the propane conversion does not depend on the vanadium content, unexposed on the surface. The activation of the C-H bond of propane is controlled by an intrinsic properties of the HAp structure, in relation with the thermally activated formation of strong basic O2- anions. Their in situ formation results from the progressive dehydration of OH- columns via an ionic conduction process by protons that is enhanced under catalytic conditions. Due to the tetrameric environment of vanadium in Ca2V2O7 against isolated tetrahedra in the solid solution, redox exchanges are facilitated, improving the selectivity in propene. The intimate contact between the two phases and the formation of a coherent interface leads to an optimal yield in propene, due to synergistic effects of the two phases
Boulangé, Agathe. "Synthèse d'analogues de l'épicocconone par réaction d'oxydation désaromatisante : relation structure fluorescences et application en protéomique". Phd thesis, INSA de Rouen, 2012. http://tel.archives-ouvertes.fr/tel-00735882.
Texto completo da fonteZils, Régis. "Réactions hétéro-homogènes de pyrolyse et d'oxydation de l'isobutane, vers 800 K : étude cinétique et modélisation". Nancy 1, 1996. http://www.theses.fr/1996NAN10275.
Texto completo da fonteMonnet, Franck. "Étude de la réaction d'oxydation partielle du méthane à hautes températures et en réacteur à temps courts". Lyon 1, 2000. http://www.theses.fr/2000LYO10241.
Texto completo da fonteVanel, Rémi. "Conception de catalyseurs d'oxydation non métalliques utilisant l'oxygène de l'air". Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENV058/document.
Texto completo da fonteN-Hydroxytetraphenylphthalimide (NHTPPI) exhibits a better catalytic activity than N-hydroxyphtalimide (NHPI) in the aerobic oxidation of organic substrates. Two new routes to functionalized analogs of NHTPPI have been studied. The first one involves a Diels-Alder reaction between polyaromatic thiophene oxides or dioxides and maleimide or maleic anhydrid. Several limitations make this approach difficult to generalize. In the second approach, the key step is a cycloaddition between tetracyclones or acecyclones and 2-bromomaleimide to directly give the phthalimide framework by decarbonylation and deshydrobromation of the Diels-Alder adduct. This versatile and efficient methodology allowed us to introduce various functional groups on the aromatic cycles borne by the central ring, and thus, new NHTPPI analogs, along with N-hydroxydiarylacenaphthophtalimides, were obtained in only three to five steps. Axial chirality was underlined in the diarylacenaphtophtalimide family and resolution of enantiomers was carried out in one case, which opens a way to new chiral analogs of NHPI. The new N-hydroxyimides exhibit excellent performances as catalysts in aerobic oxidation, superior to NHPI and, in some cases, to NHTPPI
Vanel, Remi. "Conception de catalyseurs d'oxydation non métalliques utilisant l'oxygène de l'air". Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00650134.
Texto completo da fonte