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Academic literature on the topic 'Oxydes de carbon'

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Published: 20 April 2024

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Journal articles on the topic "Oxydes de carbon"

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El-Nabarawy, Th, N. Sh Petro, and S. Abdel-Aziz. "Adsorption Characteristics of Coal-based Activated Carbons. II. Adsorption of Water Vapour, Pyridine and Benzene." Adsorption Science & Technology 15, no. 1 (February 1997): 47–57. http://dx.doi.org/10.1177/026361749701500105.

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Chemically-activated carbons were prepared by carbonizing Maghara coal with different amounts of phosphoric acid at 873 K. Steam-activated carbons of different burn-off were prepared by gasifying non-activated carbon prepared by carbonization at 873 K with steam at 1173 K. Samples of steam-activated carbons were also treated with concentrated nitric acid or with potassium dichromate. The adsorption of water vapour and benzene was determined at 308 K. The adsorption of pyridine was followed on the chemically-activated carbons at 343 K. The adsorption of water vapour was found to be related to the surface area and the amount of carbon–oxygen groups. Some of the adsorbed water was found to be specifically held to the surface and could be used to determine the number of carbon–oxygen groups on the surface. Two mechanisms are involved in the adsorption of pyridine on the carbons investigated. These are physisorption on the oxygen-free surface and chemisorption on carbon–oxygen groups of an acidic nature. Benzene may be vertically oriented in micropores, horizontally oriented in wider pores and may be even inaccessible to the fraction of the surface located in ultramicropores. Benzene adsorption is also retarded by the existence of a high concentration of carbon–oxygen groups oh the surface.
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Yuen, Pong Kau, and Cheng Man Diana Lau. "Using Mean Oxidation Number of Organic Carbons to Count Theoretical Chemical Oxygen Demand." International Journal of Chemistry 16, no. 1 (March 21, 2024): 88. http://dx.doi.org/10.5539/ijc.v16n1p88.

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Chemical oxygen demand and mean oxidation number of organic carbons are two important concepts in redox chemistry. The former is used for counting pure or mixed organic matters in aqueous solution. The latter is a redox metric for water treatment, organic combustion, and anaerobic digestion. Currently the calculation of theoretical chemical oxygen demand of neutral organic matter is based on the number of moles of molecular oxygen (O2). However, the calculation of theoretical chemical oxygen demand of ionic organic matter has seldom been studied. The purpose of this article is to develop a simple mathematical equation for doing so by using mean oxidation number of organic carbons. To develop the equation, relationships among chemical oxygen demand, mean oxidation number of organic carbons, number of organic carbons, and formula mass of organic matter are identified. The mathematical equations for chemical oxygen demand, total organic carbon, and the ratio of chemical oxygen demand to total organic carbon are also established for any molecule(s).
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El-Nabarawy, Th, G. A. Fagal, and L. B. Khalil. "Removal of Ammonia from Aqueous Solution Using Activated Carbons." Adsorption Science & Technology 13, no. 1 (February 1996): 7–13. http://dx.doi.org/10.1177/026361749601300102.

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The surface areas of non-activated, activated and modified activated carbons were determined from the adsorption of nitrogen at −196°C and of carbon dioxide at 25°C. The base neutralization capacities were determined from the adsorption of NaOH, Na2CO3, NaHCO3 and NH4OH. The amount of oxygen combined to the carbon surface was estimated by measuring the pressure of CO and CO2 obtained on outgassing the carbon sample in the temperature range 300–1000°C. The surface area of activated carbon is not a determining factor in its ammonia adsorption. The surface acidity of the active carbon is a good measure of its capacity for ammonia removal. Ammonia adsorption increases appreciably upon surface oxidation of carbons with oxidizing gases and solutions. The acidic groups on the surface of carbons differ in their strength. Only a fraction of the surface covered by the carbon–oxygen groups is responsible for the capacity of the carbon towards ammonia. Most of the adsorbed ammonia is recovered upon treatment with dilute hydrochloric acid leaving the surface free for successive ammonia adsorption cycles.
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Renlund, Gary M., Svante Prochazka, and Robert H. Doremus. "Silicon oxycarbide glasses: Part II. Structure and properties." Journal of Materials Research 6, no. 12 (December 1991): 2723–34. http://dx.doi.org/10.1557/jmr.1991.2723.

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Silicon oxycarbide glass is formed by the pyrolysis of silicone resins and contains only silicon, oxygen, and carbon. The glass remains amorphous in x-ray diffraction to 1400 °C and shows no features in transmission electron micrographs (TEM) after heating to this temperature. After heating at higher temperature (1500–1650 °C) silicon carbide lines develop in x-ray diffraction, and fine crystalline regions of silicon carbide and graphite are found in TEM and electron diffraction. XPS shows that silicon-oxygen bonds in the glass are similar to those in amorphous and crystalline silicates; some silicons are bonded to both oxygen and carbon. Carbon is bonded to either silicon or carbon; there are no carbon-oxygen bonds in the glass. Infrared spectra are consistent with these conclusions and show silicon-oxygen and silicon-carbon vibrations, but none from carbon-oxygen bonds. 29Si-NMR shows evidence for four different bonding groups around silicon. The silicon oxycarbide structure deduced from these results is a random network of silicon-oxygen tetrahedra, with some silicons bonded to one or two carbons substituted for oxygen; these carbons are in turn tetrahedrally bonded to other silicon atoms. There are very small regions of carbon-carbon bonds only, which are not bonded in the network. This “free” carbon colors the glass black. When the glass is heated above 1400 °C this network composite rearranges in tiny regions to graphite and silicon carbide crystals. The density, coefficient of thermal expansion, hardness, elastic modulus, index of refraction, and viscosity of the silicon oxycarbide glasses are all somewhat higher than these properties in vitreous silica, probably because the silicon-carbide bonds in the network of the oxycarbide lead to a tighter, more closely packed structure. The oxycarbide glass is highly stable to temperatures up to 1600 °C and higher, because oxygen and water diffuse slowly in it.
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Jiarun, Yin. "Stable carbon and oxygen isotopes in Jurassic shells as palaeosalinity indicators." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1991, no. 3 (March 4, 1991): 163–76. http://dx.doi.org/10.1127/njgpm/1991/1991/163.

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LIU, Pou, Fumihito ARAI, and Toshio FUKUDA. "1P1-C16 Oxygen Gas Assisted Nanofabrication and Nanoassembly of Carbon Nanotubes." Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2006 (2006): _1P1—C16_1—_1P1—C16_4. http://dx.doi.org/10.1299/jsmermd.2006._1p1-c16_1.

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Holail, Hanafy. "Carbon and oxygen ratios of Middle Eocene dolomite, Gebel Ataqa, Egypt." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 191, no. 1 (April 13, 1994): 111–24. http://dx.doi.org/10.1127/njgpa/191/1994/111.

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Volperts, Aleksandrs, Ance Plavniece, Kätlin Kaare, Galina Dobele, Aivars Zhurinsh, and Ivar Kruusenberg. "Influence of Chemical Activation Temperatures on Nitrogen-Doped Carbon Material Structure, Pore Size Distribution and Oxygen Reduction Reaction Activity." Catalysts 11, no. 12 (November 30, 2021): 1460. http://dx.doi.org/10.3390/catal11121460.

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The goal of this research was to synthesize activated nitrogen-doped nanocarbons with high specific surface area and adjustable pore size distribution using wood charcoal as a raw material. The resulting carbon materials were tested for possible application as oxygen reduction reaction catalysts in alkaline media. Activated carbons were obtained using a thermochemical activation method with NaOH. Nitrogen was introduced into activated carbons using dicyandiamide solution. It was demonstrated that the content of introduced nitrogen depends on oxygen content in the structure of the activated carbon. The oxygen reduction reaction activity of the activated and nitrogen-doped carbon material was comparable with a commercial 20% Pt/C catalyst. Electrocatalytic properties of the synthesized N-doped wood-derived carbon catalysts may be associated with the highly developed surface area, specific ratio of micro- and mesopores, as well as the high percentage of pyridinic nitrogen.
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Rivera–Utrilla, J., and M. A. Ferro–García. "Effect of Carbon–Oxygen and Carbon–Nitrogen Surface Complexes on the Adsorption of Cations by Activated Carbons." Adsorption Science & Technology 3, no. 4 (December 1986): 293–302. http://dx.doi.org/10.1177/026361748600300409.

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Adsorption studies of Na+, Cs+, Ag+, Sr2+ and Co2+ from aqueous solutions by surface-treated activated carbons are reported. Carbon–oxygen and carbon–nitrogen surface complexes were formed on an activated carbon from almond shells by treating it with either oxidizing reagents or ammonia. In order to discover the surface acidity and/or basicity of each carbon, selective neutralization techniques were carried out. Both Na+ and Cs+ are adsorbed by only those carbons containing strong acidic functional groups; however, Ag+, Sr2+ and Co2+ are adsorbed not only by these latter carbons but also by those with predominance of basic groups. The results suggest that some of these carbons can be used to remove, separate and pre-concentrate all the cations studied.
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Harris, P. J. F. "Non-Graphitizing Carbon: Its Structure and Formation from Organic Precursors." Eurasian Chemico-Technological Journal 21, no. 3 (September 30, 2019): 227. http://dx.doi.org/10.18321/ectj863.

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Non-graphitizing carbon, or char, has been intensively studied for decades, but there is still no agreement about its detailed atomic structure. The first models for graphitizing and non-graphitizing carbons were proposed by Rosalind Franklin in the early 1950s, and while these are correct in a broad sense, they are incomplete. Subsequent models also fail to explain fully the structure of non-graphitizing carbons. The discovery of the fullerenes and related structures stimulated the present author and others to put forward models which incorporate non-hexagonal rings into hexagonally-bonded sp2 carbon networks, creating a microporous structure made up of highly curved fragments. However, this model has not been universally accepted. This paper reviews the models that have been put forward for non-graphitizing carbon and outlines the evidence for a fullerene-like structure. This evidence comes from transmission electron microscopy, electron energy loss spectroscopy and Raman spectroscopy. Finally, the influence of precursor chemistry on the structure of graphitizing and non-graphitizing carbons is discussed. It is well established that carbonization of oxygen–containing precursors tends to produce non-graphitizing carbons. This may be explained by the fact that the removal of oxygen from a hexagonal carbon network can result in the formation of pentagonal carbon rings.
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Dissertations / Theses on the topic "Oxydes de carbon"

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Fellenberg, Ana Katiuce. "Nanoconfinement pour la synthèse de molécules plateforme à partir des oxydes de carbone." Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILR069.

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Les impacts énergétiques et environnementaux ont conduit les processus industriels. L'utilisation de la biomasse comme matière première constitue un moyen durable de produire des carburants. La synthèse Fischer-Tropsch (FT)est une alternative prometteuse pour la conversion des matières premières renouvelables en produits chimiques et en carburants. Même si la synthèse FT est considérée comme une technologie bien établie, certains principes chimiques fondamentaux doivent être mieux compris et approfondis. L'utilisation et la transformation du CO2 en produits chimiques à valeur ajoutée ont suscité un intérêt mondial, tant du point de vue théorique que pratique. L'hydrogénation du CO2 en acide formique est un exemple de conversion du CO2 en un hydrocarbure liquide utile, et est réalisée à l'aide de catalyseurs homogènes. Cependant, quelques travaux montrent que des catalyseurs métalliques supportés hautement dispersés sont capables de réaliser cette réaction. L'activité élevée de ces catalyseurs pourrait être attribuée à leur capacité à stabiliser le métal actif dans un état d'atomes métalliques uniques ou de complexes métalliques hétérogénéisés, qui peuvent démontrer une activité plus élevée que les atomes métalliques à la surface des nanoparticules métalliques.Dans ce travail, nous avons considéré deux espaces confinés différents de matériaux à base de carbone, les nanotubes de carbone (CNTs) et les COF (covalent organic frameworks), et évalué le nanoconfinement des espèces actives de fer, de cuivre et de ruthénium pour les réactions d'hydrogénation du CO et du CO2 pour la production des molécules plates-formes.Dans les catalyseurs à base de fer pour la synthèse du FT supportés par des CNTs, la phase active était nanoconfinée à l'intérieur des canaux ou localisée sur la surface extérieure. Dans la plupart des travaux antérieurs, la distribution des nanoparticules métalliques à l'intérieur ou à l'extérieur des CNTs est considérée comme immobile pendant l'activation du catalyseur ou la réaction catalytique. Dans ce travail, nous avons découvert une mobilité remarquable des espèces de fer et de cuivre dans les catalyseurs bimétalliques entre les canaux intérieurs des CNTs et la surface extérieure, qui se produit dans le monoxyde de carbone et le gaz de synthèse, alors qu'il n'y a pratiquement pas de migration des espèces de fer dans les catalyseurs monométalliques. Cette mobilité est renforcée par une fragilité et des défauts notables dans les CNTs, qui apparaissent lors de leur imprégnation par les solutions acides des précurseurs métalliques et de la décomposition des précurseurs. La mobilité remarquable des espèces de fer et de cuivre dans les catalyseurs bimétalliques affecte la genèse des sites actifs du fer et renforce l'interaction du fer avec le promoteur. Dans les catalyseurs bimétalliques fer-cuivre, la principale augmentation de l'activité a été attribuée à une fréquence de renouvellement des réactions plus élevée sur les sites de surface du fer situés à proximité du cuivre.Pour l'hydrogénation du CO2 en acide formique, nous proposons une stratégie basée sur des matériaux COF avec différentes structures et compositions chimiques pour la médiation de la dispersion du ruthénium et la conception de catalyseurs efficaces pour l'hydrogénation du CO2 à basse température en acide formique. La caractérisation in-situ combinée à des tests catalytiques a révélé que la densité des groupes fonctionnels d'azote dans la matrice COF était le facteur clé affectant la dispersion et la performance des catalyseurs de ruthénium soutenus par COF. Les performances du catalyseur découlent principalement de la capacité du ruthénium à persister sous forme d'atomes uniques dans des sites spécifiques et à résister à sa réduction à l'état métallique. La stratégie proposée pour la médiation de la dispersion des métaux peut être étendue au développement d'une variété de catalyseurs à atome unique soutenus par COF pour différentes réactions
Energy and environmental impacts drove the industrial processes. A sustainable route to produce fuels starts using biomass as raw material. Fischer-Tropsch synthesis is a promising alternative way for conversion of renewable feedstocks to chemicals and fuels. Even FT synthesis is considered a well-established technology, there are chemistry fundamentals to be better and deeply understood. Besides, the FT process depends strongly on the catalyst performance. The utilization and transformation of CO2 into value-added chemicals have been of global interest, from both theoretical and practical viewpoints. One example of CO2 conversion to a useful liquid hydrocarbon is hydrogenation of CO2 to formic acid (HCOOH). The state-of-the-art hydrogenation of CO2 to formic acid is produced over homogeneous catalysts. However, there are a few works showing that highly dispersed supported metal catalysts are able to carry out this reaction. The high activity of these catalysts could be assigned to their ability to stabilize the active metal in a state of single-metal atoms or heterogenized metal complexes, which may demonstrate a higher activity than metal atoms on the surface of metal nanoparticles.In this work we have considered two different confined spaces of carbon-based materials, CNTs and COFs, and evaluated the nanoconfinement of iron, copper and ruthenium active species for CO and CO2 hydrogenation reactions to produce value-added chemicals and platform molecules.In the iron catalysts for FT synthesis supported by carbon nanotubes, the active phase was nanoconfined inside the channels or localized on the outer surface. In most of previous work, the distribution of metal nanoparticles inside or outside carbon nanotubes is considered to be immobile during the catalyst activation or catalytic reaction. In this work, we uncovered remarkable mobility of both iron and copper species in the bimetallic catalysts between inner carbon nanotube channels and outer surface, which occurs in carbon monoxide and syngas, while almost no migration of iron species proceeds in the monometallic catalysts. This mobility is enhanced by noticeable fragility and defects in carbon nanotubes, which appear on their impregnation with the acid solutions of metal precursors and precursor decomposition. Remarkable mobility of iron and copper species in bimetallic catalysts affects the genesis of iron active sites, and enhances interaction of iron with the promoter. In the bimetallic iron-copper catalysts, the major increase in the activity was attributed to higher reaction turnover frequency over iron surface sites located in a close proximity with copper.For CO2 hydrgentaion to formic acid, we propose a strategy based on COF materials with different structures and chemical compositions for mediation of ruthenium dispersion and design of efficient catalysts for low-temperature CO2 hydrogenation to formic acid. Operando characterization combined with catalytic tests revealed that the density of nitrogen functional groups in the COF matrix was the key factor affecting the dispersion and performance of COF-supported ruthenium catalysts. The catalyst performance primarily arises from ruthenium capability to persist as single atoms in specific sites and resist its reduction to the metallic state. The proposed strategy for mediating metal dispersion can be extended to develop a variety of COF-supported single-atom catalysts for different reactions
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Siegert, Benny. "Filling of carbon nanotubes for the preparation of nano-energetic formulations." Strasbourg, 2010. https://publication-theses.unistra.fr/public/theses_doctorat/2010/SIEGERT_Benny_2010.pdf.

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Les nanothermites sont des nanomatériaux énergétiques composés d'un oxydant, le plus souvent un oxyde métallique, et d'un réducteur, comme l'aluminium ou le phosphore. Leur utilisation pratique est limitée par leur sensibilité souvent excessive aux sollicitations de friction ou de décharge électrostatique. L'incorporation de l'oxydant dans des nanotubes de carbone (NTC) — autrement dit, la séparation physique l'oxydant et du réducteur — est une nouvelle voie pour réduire la sensibilité des nanothermites. Dans ce travail de thèse, nous avons rempli différents types de NTC avec de l'oxyde de manganèse MnOx (1,6 < x < 2,0), de l'oxyde de chrome(III), de vanadium(IV) et (V) ainsi que de l'oxyde de cuivre(II). L'infiltration des sels précurseurs a été réalisée selon différents procédés impliquant la mise en œuvre de sels dissous ou fondus et l’infiltration réactive. Préalablement à l'infiltration, les NTC ont été ouverts et/ou fonctionnalisés par des groupements oxygénés par un traitement d'oxydation. Les nanocomposites MOx@NTC ainsi élaborés ont été utilisés pour formuler des nanothermites à sensibilité réduite. En comparaison avec les formulations de référence ne contenant pas de nanotubes, la sensibilité à la décharge électrostatique est réduite de plusieurs ordres de grandeur, tout comme d’ailleurs la sensibilité à la friction. La combustion de ces nanothermites est cependant beaucoup moins rapide que celle des formulations de référence. L'analyse des résidus de combustion a mis en évidence la formation de carbure d'aluminium en tant que produit secondaire de combustion. Ce travail ouvre une nouvelle voie pour l'amélioration de la sécurité des systèmes pyrotechniques
Nanothermites are versatile pyrotechnic systems composed of an oxidizer, such as a metal oxide, and a fuel, such as aluminum. However, their sensitivity to mechanical stress (especially friction) and electrostatic discharges, which is often very high, restricts their practical use. Enclosing the metal oxide inside carbon nanotubes (CNT) – thus separating oxidizer and fuel – is a new way to lower the sensitivity of a nanothermite. In this work, we filled different types of CNT with manganese oxides MnOx (1. 6 < x < 2. 0), chromium(III) oxide, vanadium(IV) and (V) oxide and copper(II) oxide. Different methods for the infiltration of the precursor salts (solution infiltration, molten salt, reactive infiltration) have been used. Before the infiltration, the tubes were opened and/or functionalized with oxygenated functional groups by oxidation; the oxidation kinetics were investigated, and different oxidation methods (nitric acid, air oxidation, filling with molten KOH) were compared. The resulting nanocomposites are used to prepare reduced-sensitivity nanothermites, in which the oxidizer is replaced by the metal oxide filled CNTs. Compared to reference formulations without the addition of CNTs, the electrostatic discharge sensitivity of these compositions is decreased by several orders of magnitude, and they are completely insensitive to friction stress. The combustion of the reduced-sensitivity nanothermites is much slower than the one of the reference formulations. Analysis of the combustion residues indicates that aluminum carbide was formed as a secondary combustion product. This work shows a new route for the design of safer pyrotechnic systems
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Schlienger, Sébastien. "Nouvelles voies de synthèses de carbones et céramiques non-oxydes à porosités contrôlées." Thesis, Mulhouse, 2011. http://www.theses.fr/2011MULH5991.

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Les matériaux nanoporeux (méso- et/ou micro-poreux) visent des applications en relation avec les phénomènes d’adsorption tels que la catalyse, la dépollution, le stockage de gaz ou d’énergie,… Récemment, différents types de synthèses ont donc été développés pour contrôler la porosité et l’adapter aux applications visées : synthèse par voie directe, procédé de nanomoulage, technique de réplication réactive. Pour la très grande majorité d’entre elles, elles servent à l’élaboration des matériaux oxydes méso- et micro-poreuses. L’objectif de ce travail de thèse a donc été d’étendre ces procédés à une gamme de matériaux plus large au niveau des compositions chimiques, tout en gardant un contrôle de la porosité. En effet, les oxydes poreux ont un champ d’application limité du fait, par exemple, de leur température maximale d’utilisation, de leur fragilité sous certaines atmosphères ou encore, dans certains cas, de leurs propriétés d’adsorption mal adaptées. Afin de réduire ces limitations, nous avons cherché à étendre la gamme de composition chimique des matériaux poreux dans le domaine non-oxyde (carbone, céramiques de type nitrure, …) tout en contrôlant leur porosité. Pour cela, différentes approches ont été utilisées. La première approche a consisté à étudier mécanisme de formation des matériaux carbonés mésostructurés obtenus directement par l’auto-assemblage d’un tensioactif et d’un polymère précurseur de carbone. Nous avons alors pu déterminer les paramètres pertinents à contrôler pour la reproductibilité des synthèses ayant lieu, aussi bien, en phase aqueuse que par évaporation de solvant. Des analogies avec les mécanismes de formation des matériaux siliciques ont pu être mises en évidence. [...]
Nanoporous materials (meso-and / or micro-porous) target applications in relation to the adsorption phenomena such as catalysis, waste removal, gas or energy storage.... Recently, various types of syntheses have been developed to control the porosity and adapted to applications: direct route synthesis, nanocasting process, reactive templating. For most of them, they are used for the preparation of meso-and micro-porous oxide materials. The objective of this thesis was therefore to extend these methods to a wider range of materials in chemical composition, while keeping control of the porosity. Indeed, the porous oxides have a limited scope because, for example, their maximum operating temperature, their fragility under certain atmospheres or in some cases, their adsorption properties, are unsuitable. To reduce these limitations, we searched to extend the range of chemical composition of porous materials in the non-oxide field (carbon, nitride ceramics,...) while controlling their porosity. For this, different approaches were used. The first approach consisted to study formation mechanism of mesostructured carbon materials obtained directly by the self-assembly of a surfactant and a polymer carbon precursor. We were then able to determine the relevant parameters to control syntheses reproducibility taking place both in aqueous phase and by solvent evaporation. Analogies with the formation mechanisms of siliceous materials have been identified. With a better understanding of the formation mechanisms, we declined in a second time this method of direct synthesis to other materials by varying the nature of the precursors. Thus, a "green" synthesis of a carbonaceous material with ordered mesoporosity was developed in the absence of all toxic reagents such as formaldehyde and phenol, by using a natural precursor, the mimosa tannin. [...]
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Alouche, Adel. "Propriétés du nickel déposé sur oxydes de terre rare dans la réaction de conversion d'oxydes de carbone." Poitiers, 1988. http://www.theses.fr/1988POIT2260.

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Mise en evidence du role du support dans l'activation des reactifs. Les proprietes particulieres de ces catalyseurs seraient dues a la reduction partielle du support a proximite des particules metalliques et a la modification locale des proprietes electroniques du metal
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Bobin, Alexey. "Methane reforming by carbon dioxide over metal supported on nanocrystalline mixed oxides : mechanism and transient kinetics for relating catalysts structure and performance." Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10164/document.

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L'énergie de liaison, la mobilité et la réactivité de l'oxygène dans des matériaux nanocristallins de type cérine-zircone dopée aux terres rares (La, Gd, Pr, Sm) supportant des métaux (Pt, Ni, Ru) ont été étudiées par échange isotopique en réacteurs statiques et traversés (18O2 and C18O2), DTP d'O2, RTP d'H2 et CH4, microcalorimétrie pulsée et réacteur TAP. La mobilité d'oxygène de coeur apparait comme contrôlée par le réarrangement des sphères de coordination des cations Ce et Zr et par des chemins préférentiels le long de chaines Pr3+/Pr4+. En surface et subsurface, ce contrôle se ferait par des interactions fortes métal/support avec l'incorporation de cations métalliques. Cette mobilité de l'oxygène limiterait le vieillissement et le frittage en conditions réalistes de reformage par le gaz carbonique. Des études cinétiques non stationnaires et par marquage isotopique ont permis de proposer un mécanisme bi-fonctionnel fondé sur des étapes rédox indépendantes pour l'activation du méthane et du dioxyde de carbone. L'étape limitante serait l'activation du méthane tandis que l'activation du gaz carbonique s'opérerait plus rapidement sur des sites réduits du support, générant de l'oxygène diffusant aisément vers l'interface métal/support (enthalpie de désorption 600-650 kJ/mol) pour oxyder les fragments du méthane en CO et H2. Dans les meilleures formulations catalytiques, des agrégats Ni-Ru faciliteraient l'activation du CO2 dans son état de transition, en marge de carbonates stables qui restent "spectateurs" de la réaction. Pour le Pt/PrCeZrO, il existerait une autre voie d'activation de carbonates faiblement adsorbés sur des ions Pt+ stabilisés par des cations Pr4+. Cette spécificité confère à cette formulation des perspectives très intéressantes en reformage à sec, notamment sur des supports structurés de type alumine corindon, bien adaptés à des réacteurs compacts à temps courts pour des ressources en gaz dispersées et de capacité limitée
Oxygen bonding strength, mobility and reactivity in nanocrystalline Ln-doped ceria-zirconia (Ln=La, Gd, Pr, Sm) with supported Pt, Ni, Ru were studied by state-of-the-art techniques such as isotopic exchange in static and flow reactors with 18O2 and C18O2, O2 TPD, H2 and CH4 TPR, pulse microcalorimetry and TAP reactor. Bulk oxygen mobility is found controlled by a rearrangement of Ce and Zr cations coordination sphere with doping as well as by fast oxygen migration along Pr3+/Pr4+ cationic chains. Surface and near-surface oxygen mobility appears controlled by a strong metal-support interaction with incorporation of metallic ions into surface layers and domain boundaries. In realistic feeds, the catalytic activity in dry reforming of methane correlates with oxygen mobility, required to prevent coking and metal sintering.Transient kinetic studies (non steady-state and SSITKA) allowed us to propose a bi-functional reaction mechanism corresponding to independent redox steps of CH4 and CO2 activation. The rate- limiting step is shown to be the irreversible activation of CH4 on metal sites, while CO2 dissociation on reduced sites of oxide supports proceeds much faster (being reversible for the steady-state surface) followed by a fast oxygen transfer along the surface/domain boundaries to metal sites where CH4 molecules are transformed to CO and H2. The CH4 selective conversion into syngas would involve strongly bound bridging oxygen species with heat of desorption ::600-650 kJ/mol O2. For optimized formulations, Ni+Ru clusters could be involved in CO2 activation via facilitating C-O bond breaking in the transition state, thus increasing the rate constant of the surface reoxidation by CO2, while strongly bound carbonates behave as spectators. For Pt/PrCeZrO, an additional fast route to syngas would occur on Pt ions with participation of weakly bound carbonates stabilized by neighboring Pr4+ ions. Such specificity makes this system highly promising for methane oxi-dry reforming, especially on structured corundum supports for short contact time compact reactors, well adapted to stranded and limited gas resources
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Mery, Adrien. "Oxydes de manganèse et ses composites à base de nanotubes de carbone ou de graphène pour la réalisation de supercondensateurs." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4018/document.

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Les travaux réalisés dans cette thèse ont porté sur la synthèse d’oxydes de manganèse et leur association dans des composites avec des matériaux carbonés (NTC, Graphène), pour une utilisation comme matériaux d’électrodes de supercondensateurs fonctionnant en milieux aqueux. Les caractérisations physico-chimiques et électrochimiques ont été menées sur ces matériaux afin d’évaluer leurs performances et étudier l’effet de la nanostructuration. Il s’est avéré que la réalisation de nanocomposites MnO2/ nanotubes de carbone ou MnO2/ oxydes de graphène réduits contribue à l’amélioration des performances électrochimiques. Plusieurs compositions Mn/C ont été étudiées afin de réaliser un matériau d’électrode de supercondensateur optimisé. Des dispositifs asymétriques en milieux aqueux ont été assemblés associant les meilleurs nanocomposites avec une électrode négative de graphène. De nettes améliorations en termes de densités d’énergie et de puissance ont été obtenues sur ces systèmes asymétriques fonctionnant sur 2 volts en milieux aqueux
The work realized in this thesis focused on the synthesis of manganese oxides and their assembly in composites with carbon materials (CNT, graphene) for supercapacitor applications in aqueous media. Physico-chemical and electrochemical characterizations were conducted to evaluate the effect of the nanostruturation. It was found that nanocomposites MnO2/CNT and MnO2/ reduced graphene oxide contributed to improve the electrochemical performances in aqueous media. Several compositions Mn/C were tested to estimate the best ratio for optimized electrode materials. In order to maximize the energy of the devices, asymmetric devices in aqueous media were assembled using graphene as negative electrode and nanocomposites for positive. Clear improvements in term of energy and power densities were obtained with these systems working at 2 volts in aqueous media
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Chambon, Cébastien. "Densification et homogénéisation U/Pu au cours du frittage de combustibles oxydes mixtes élaborés à partir de poudres UO2, U3O8 et PuO2." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0847.

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Dans le but de fabriquer des combustibles de type oxyde mixte (MOX = (U,Pu)O2) pour les réacteurs nucléaires du futur, l‘ajout d‘un nouvel intrant, l‘octaoxyde de triuranium (U3O8), est envisagé. Ces travaux de thèse portent sur l'influence de cet ajout pendant le frittage du MOX, ainsi que sur la stabilité dimensionnelle des pastilles frittées lors de recuits. Ces premiers essais ont révélé une dé-densification à haute température des pastilles incorporant une poudre d'U3O8 lorsqu‘elle était issue d‘une synthèse oxalique.Ce phénomène indésirable a été étudié sur un simulant inactif : un oxyde de cérium synthétisé par voie oxalique, afin de développer les techniques expérimentales et les protocoles d‘analyse. Les résultats ont mis en évidence le lien entre la présence d‘impuretés carbonées et le phénomène de dé-densification. De plus, l‘évolution de la dé-densification a été observée pour la première fois, par micro-tomographie X in situ au cours du frittage.L‘étude appliquée au combustible MOX a confirmé le rôle majeur des impuretés carbonées lors du frittage. Les évolutions microstructurales, la quantification des espèces carbonées relâchées pendant le frittage et l‘analyse des gaz piégés dans les pores du matériau fritté ont de plus conduit à identifier un mécanisme de dé-densification. Enfin, une modélisation du comportement thermomécanique du combustible sous l‘effet de la pressurisation des pores, a permis de conforter le mécanisme envisagé. Fort de cette connaissance, un nouveau cycle de frittage a pu alors être proposé et mis en application avec succès pour limiter les effets de ce phénomène
In order to manufacture mixed-oxide fuels, also known as MOX ((U,Pu)O2) for the next generation of nuclear reactors, the use of triuranium octoxide (U3O8) was considered in this study. This PhD work focuses on the impact of this addition on MOX sintering and on the dimensional stability of sintered pellets during annealing. Initial experiments revealed a de-densification phenomenon at high temperature in the pellets containing U3O8 synthesized from an oxalic route.This undesirable phenomenon was studied on an inactive surrogate: a cerium oxide synthesized from an oxalic route in order to develop experimental techniques and protocols. The relationship between the presence of carbon impurities in the powders and the de-densification phenomenon was proven. Moreover, this de-densification phenomenon was observed in situ for the first time by using X-ray microtomography during sintering.The study of MOX fuels confirmed the major role of carbon impurities. The microstructural evolutions, the quantification of the carbon species released during sintering and the analysis of gases trapped inside the porosity of the sintered material led to the determination of a de-densification mechanism. Finally, a thermomechanical modelling of the fuel behavior under the effect of pore pressurization allows consolidating the proposed mechanism. Based on these results, a new sintering cycle was proposed and the first trials successfully limited the impact of the de-densification phenomenon
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Genty, Éric. "Synthèse par méthodes conventionnelles ou non d'oxydes mixtes par voie hydrotalcite : Application pour l'oxydation des COV et du CO." Thesis, Littoral, 2014. http://www.theses.fr/2014DUNK0412.

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Les émissions de composés organiques volatiles (COV) dans l'atmosphère sont réglementées à caus de leur impact sur la santé. L'oxydation catalytique est une des techniques prometteuses pour limiter ces émissions. L'objectif de ce travail était de mettre au point des catalyseurs actifs, sélectifs en dioxyde de carbone et stables pour la destruction de COV. Afin de trouver une alternative à l'utilisation de catalyseurs à base de métaux nobles, ce travail de recherche a été orienté sur la synthèse de matériaux à base d'oxydes de métaux de transition. Les différents oxydes mixtes ont été caractérisés par différentes techniques physico-chimiques dont la Diffraction des Rayons X (DRX), les Analyses Thermiques (ATD/ATG), la Réduction en Température Programmée (H₂-RTP), la Microscopie Électronique à Transmission (MET), la Spectrométrie de Photoélectrons induits par rayons X (SPX),... Dans un premier temps, une étude sur la préparation d'oxydes mixtes issus de précurseurs de type hydrotalcite a été menée, concernant le remplacement du cation bivalent. Cette étude a montré que l'oxyde mixte contenant du cobalt et de l'aluminium présentait une activité catalytique intéressante pour l'oxydation du toluène ainsi que du monoxyde de carbone. Afin d'améliorer cet oxyde mixte, une étude sur l'influence des méthodes non conventionnelles de préparations du précurseur hydrotalcite a été effectuée. Les micro-ondes ainsi que les ultrasons ont été utilisés lors de cette synthèse et les différents oxydes mixtes ont été testés dans les réactions du toluène et du CO. Lors de cette application, un effet bénéfique de l'utilisation des micro-ondes lors de la synthèse a été observé. Dans un troisième temps, une étude de l'incorporation de cérium dans la structure hydrotalcite a été menée. Un oxyde mixte du type CoAlCe a montré une activité catalytique intéressante pour l'oxydation totale du toluène. De plus, une relation entre la réductabilité et l'activité catalytique a pu être mise en évidence. Une comparaison entre les meilleurs catalyseurs de cette étude et des catalyseurs à base de métaux nobles commerciaux a été abordée. L'étude cinétique de l'oxydation totale du toluène a montré, que dans le cas des oxydes mixtes CoAlCe et CoAl, un mécanisme du type Mars Van Krevelen décrirait le mieux la réaction. Enfin, les quatre meilleurs oxydes mixtes ont été testés dans la réaction d'oxydation du toluène en présence de monoxyde de carbone. Un effet bénéfique de celui-ci sur la réactivité vis-à-vis du toluène a été observé
Catalytic oxidation is one of the promising technologies to reduce VOC emissions. The objective of this work was to develop active, selective and stable catalyst for the destruction of VOC. In order to find an alternative to the use of noble metals based catalysts, this research has been focused on the synthesis of materials based on transition metal oxides. The various mixed oxides were characterized by different physico-chemical techniques including XRD, Thermal Analysis, H2-TPR, TEM, XPS...Initially, a study on the preparation of mixed oxides derived from hydrotalcite-like precursors was conducted. Thus, it was shown that the mixed oxide containing cobalt and aluminum exhibited interesting for catalytic activity for the toluene aznd carbon monoxide total oxidation. To improve this mixed oxide, a study of the influence of non-conventional methods for the preparation of the precursor was performed. The microwave and ultrasound have been used in these syntheses. The various mixed oxides thus prepared were tested in the oxidation reactions of CO and toluene. In this application, a beneficial effectvof the use of microwaves in the synthesis was observed. Thirdly, a study of the incorporation of cerium in the hydrotalcite structure was conducted. Mixed oxides of CoAlCe show interest for the total oxidation of toluene catalytic activity. Moreover, a relationship between the reductibility and the catalytic activity has been demonstrated. A comparison of the best catalysts of this study and catalysts of noble metals business was discussed. The kinetic study of the complete oxidation of toluene showed that in the case of mixed oxides CoAlCe and CoAl, a mechanism of March Van Krevelen type described the reaction
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Ryabova, Anna. "Électrocatalyse de la réduction de l'oxygène et du peroxyde d'hydrogène sur les oxydes de manganèse." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF011/document.

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Les oxydes de manganèse présentent un grand intérêt en raison de leur activité catalytique pour l'ORR (la réaction de réduction de l’oxygène) en milieu alcalin et peuvent être utilisés comme matériaux sans métaux nobles pour la cathode dans les piles à combustible. La présente thèse est consacrée à l’étude de l’activité d'oxydes de manganèse pour l’ORR. Il a été montré que Mn2O3 avec structure bixbyite a une meilleure activité catalytique vers l'ORR en milieu alcalin que les autres oxydes de manganèse étudiés. L'activité spécifique de Mn2O3 est seulement 4 fois inférieure à celle de Pt à une surtension de 0.3 V (ERH). Le lien entre la structure des oxydes de Mn et l'activité ORR est identifié: l'activité spécifique augmente exponentiellement avec le potentiel du couple redox Mn(III)/Mn(IV) de surface. Pour assurer l'activité électrocatalytique élevée de Mn2O3, il est nécessaire d'ajouter du carbone à la composition d'électrode, ainsi que de garder un potentiel supérieur à 0.7 V (ERH)
Manganese oxides are of great interest due to their catalytic activity towards the ORR (the oxygen reduction reaction) in alkaline media and can be used as noble metal-free materials for the cathode in liquid and polymer electrolyte alkaline fuel cells. The present thesis is devoted to the investigation of the ORR activity of manganese oxides. It was shown that Mn2O3 with bixbyite structure has a better catalytic activity toward the ORR in alkaline media than other investigated manganese oxide, the surface activity of Mn2O3 is only 4 times lower than that of Pt at an overvoltage of 0.3 V (RHE). The link between the structure of Mn oxides and the ORR activity is found: the specific ORR activity exponentially increases with the potential of the surface Mn(III)/Mn(IV) red-ox couple. To ensure the high electrocatalytic activity of Mn2O3, it is necessary to add carbon to the electrode composition, as well as to keep potential above 0.7 V (RHE)
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Dib, Hadi. "Traitement catalytique des émissions issues de la combustion de la biomasse." Thesis, Littoral, 2019. https://documents.univ-littoral.fr/access/content/group/50b76a52-4e4b-4ade-a198-f84bc4e1bc3c/BULCO/Th%C3%A8ses/Toxicologie/These_DIB_Hadi.pdf.

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La combustion de la biomasse et en particulier du bois constitue une alternative intéressante à l'utilisation des combustibles fossiles pour l'approvisionnement en énergie. Elle présente l'avantage de pouvoir être renouvelable sans contribuer à une émission supplémentaire de CO₂. Cependant, il est connu que les appareils de chauffage utilisant la biomasse comme combustible peuvent générer certains polluants gazeux dont notamment les Composés Organiques Volatils (COV) et le monoxyde de carbone (CO). Le post-traitement catalytique se révèle comme une des technologies les plus prometteuses pour limiter ces émissions de polluants. Ce projet vise donc à développer des matériaux catalytiques actifs, sélectifs en dioxyde de carbone et stables, assurant une décomposition complète du mélange de COV et de CO. Les catalyseurs à base de métaux nobles, étant reconnus pour leur bonne activité pour ce type de réaction d'oxydation, engendrent cependant un coût important pour le développement d'un tel procédé. L'objectif de nos travaux sera donc basé sur la synthèse et le développement de nouveaux matériaux catalytiques peu onéreux à base d'oxydes de métaux de transition qui seront utilisés comme alternatifs aux catalyseurs à base de métaux nobles. Afin d'obtenir des oxydes performants, la synthèse des matériaux en utilisant la voie hydrotalcite a été choisie. Nous avons montré l'effet bénéfique de l'ajout du cérium dans les oxydes MgAl-O et CuAl-O vis-à-vis de l'oxydation du toluène et/ou du CO. Une relation entre la réductibilité et l'activité de ces solides pour ces réactions a été observée. Pour les catalyseurs MgAlCe-O, aucun effet sur la conversion du toluène n'a été observé, cependant un effet significatif sur la conversion du CO en présence de toluène a été mis en évidence. Ainsi, un oxyde du type CuAlCe-O s'est avéré actif et stable pour la destruction de mélanges de COV et de CO. De plus, l'intérêt d'utiliser la voie hydrotalcite pour synthétiser ces oxydes CuAlCe-O a été vérifié par comparaison avec d'autres voies de synthèses. L'activité supérieure du catalyseur CuAlCe-O peut être corrélée à un effet de synergie entre les éléments cuivre et cérium
Biomass burning, in particular wood, is an attractive alternative to the utilization of fossil fuels for energy supply, as it is renewable and does contribute to any additional CO₂ emission into atmospher. However, it is known that heating appliances using biomass generate large amounts of Volatile Organic Compounds (VOCs) and carbon monoxide (CO) during the combustion cycle. A catalytic post-treatment is one of the most promising technologies to limit the emissions of these pollutants. This project aims to develop active and selective catalytic materials with enhanced redox properties in order to achieve the total oxidation of VOCs and CO at low temperature. Noble metals based catalysts are considered as good candidates for such types of reactions. However, these catalysts are very expensive for adaptation to domestic heating device. The objective of our work is focused on the synthesis and development of innovative and cheaper catalytic materials composed of transition metal oxides that could be used as alternatives to noble metal catalysts. In order to obtain efficient oxides, the hydrotelcite route was chosen for the synthesis of the catalysts. The beneficial effect of adding cerium to MgAl-O and CuAl-O oxides towards the oxidation of toluene and/or CO was demonstrated. A relationship between the reducibility and activity of these solids for these reactions has been also identified. For MgAlCe-O catalysts, a beneficial effect on the conversion of toluene in presence of CO was observed. Indeed, the temperature of toluene oxidation was shifted at lower temperatures in presence of CO. In contrary, no effect on toluene conversion was observed for the CuAlCe-O materials. However, a significant effect on the conversion of CO in presence of toluene was revealed. Briefly, a CuAlCe-O type oxide with high activity and stability has been synthesized for the destruction of VOCs and CO mixtures. In addition, the advantage of using the hydrotalcite route to synthesize these CuAlCe-O oxides has been verified by comparison with other synthetic routes. The high activity of the CuAlCe-O catalyst can be attributed to the synergic effect between copper and cerium elements
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Books on the topic "Oxydes de carbon"

1

J, Raub, United Nations Environment Programme, International Labour Organisation, World Health Organization, Inter-Organization Programme for the Sound Management of Chemicals., and International Program on Chemical Safety., eds. Carbon monoxide. 2nd ed. Geneva: World Health Organization, 1999.

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author, Schware Robert 1952, ed. Climate change and society: Consequences of increasing atmospheric carbon dioxide. New York, NY: Routledge, 2018.

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1958-, Hawkins Isabel, and United States. National Aeronautics and Space Administration., eds. Carbon stars with oxygen-rich circumstellar material. Los Angeles, Calif: University of California, Los Angeles, Dept. of Astronomy, 1992.

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1958-, Hawkins Isabel, and United States. National Aeronautics and Space Administration., eds. Carbon stars with oxygen-rich circumstellar material. Los Angeles, Calif: University of California, Los Angeles, Dept. of Astronomy, 1992.

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Williams, Douglas F. Isotope chronostratigraphy: Theory and methods. San Diego: Academic Press, 1988.

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Harman, Rebecca. Carbon-oxygen and nitrogen cycles: Respiration, photosynthesis and decomposition. Oxford: Heinemann Library, 2006.

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United States. National Aeronautics and Space Administration., ed. Electrochemical cell for obtaining oxygen from carbon dioxide atmospheres. Clemson, SC: Dept. of Ceramic Engineering, Clemson University, 1990.

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1942-, Maeder André, Charbonnel Corinne, Schaerer Daniel, and Meynet G, eds. CNO in the universe: Proceedings of a conference held at Saint-Luc, Valais, Switzerland, 10-14 September 2002. San Francisco, Calif: Astronomical Society of the Pacific, 2003.

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K, Bi͡utner Ė. Planetarnyĭ gazoobmen O₂ i CO₂. Leningrad: Gidrometeoizdat, 1986.

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Hernandez, R. Carbon deposition model for oxygen-hydrocarbon combustion: Interim final report. Sacramento, CA: AeroJet TechSystems Co., 1987.

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Book chapters on the topic "Oxydes de carbon"

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Perrot, Pierre. "Carbon – Oxygen – Uranium." In Refractory metal systems, 595–605. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-02700-0_39.

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Elias, Hans-Georg. "Carbon-Oxygen Chains." In Macromolecules, 309–64. D-69451 Weinheim, Germany: Wiley-VCH Verlag GmbH, 2014. http://dx.doi.org/10.1002/9783527627226.ch7.

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DeJong, T. M. "Energy capture and carbon assimilation." In Concepts for understanding fruit trees, 4–17. Wallingford: CABI, 2022. http://dx.doi.org/10.1079/9781800620865.0002.

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Abstract This chapter focuses on energy capture and carbon assimilation of fruit trees. It discusses the factors affecting photosynthesis and respiration, including temperature, carbon dioxide concentration, nutrient supply, water availability, oxygen, and carbohydrates.
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Anderson, G. K. "Reactions of Carbon-Oxygen and Carbon-Nitrogen Bonds." In Inorganic Reactions and Methods, 295–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145296.ch227.

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Sidek, Haslinda Mohd, Nurul Asikin-Mijan, Mohd Razali Shamsuddin, and Yun Hin Taufiq-Yap. "Carbon Composite Catalysts for Oxygen Reduction Reactions." In Carbon Composite Catalysts, 107–30. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1750-9_4.

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Bulyarskiy, Sergey, Alexandr S. Basaev, Darya A. Bogdanova, and Alexandr Pavlov. "Oxygen Interaction with Electronic Nanotubes." In Doping of Carbon Nanotubes, 103–13. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_4.

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Bothe, Harald, Gerd Bröker, Uta Müller, Iris Schall, Susanne Textor, Bernhard T. Golding, and Wolfgang Buckel. "Mechanisms of Coenzyme B12-Dependent Carbon-Carbon and Carbon-Oxygen Rearrangements." In Vitamin B12and B12-Proteins, 237–51. Weinheim, Germany: Wiley-VCH Verlag GmbH, 2007. http://dx.doi.org/10.1002/9783527612192.ch15.

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Zoecklein, Bruce W., Kenneth C. Fugelsang, Barry H. Gump, and Fred S. Nury. "Oxygen, Carbon Dioxide, and Nitrogen." In Wine Analysis and Production, 216–27. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4757-6967-8_14.

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Zoecklein, Bruce W., Kenneth C. Fugelsang, Barry H. Gump, and Fred S. Nury. "Oxygen, Carbon Dioxide, and Nitrogen." In Wine Analysis and Production, 216–27. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-6978-4_14.

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Ovando-Martínez, M., C. A. Ruiz-Pardo, A. E. Quirós-Sauceda, G. R. Velderrain-Rodríguez, G. A. González-Aguilar, and J. F. Ayala-Zavala. "Oxygen, Carbon Dioxide, and Nitrogen." In Postharvest Management Approaches for Maintaining Quality of Fresh Produce, 1–16. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-23582-0_1.

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Conference papers on the topic "Oxydes de carbon"

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Alexey, Sukhorukov, Pavel Ushakov, Yana Naumovich, and Sema Ioffea. "NEW METHODS FOR THE CONSTRUCTION OF CARBON-CARBON AND CARBON-HETEROATOM BONDS UTILIZING NITRO-DERIVATIVES." In Chemistry of nitro compounds and related nitrogen-oxygen systems. LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m721.aks-2019/53-55.

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Maheswari, S., P. Sridhar, and S. Pitchumani. "Palladium supported on partially unzipped carbon nanotube as a methanol tolerant catalyst for oxygen reduction reaction in alkaline medium." In CARBON MATERIALS 2012 (CCM12): Carbon Materials for Energy Harvesting, Environment, Nanoscience and Technology. AIP, 2013. http://dx.doi.org/10.1063/1.4810059.

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Mehmonov, Kamoliddin. "THE EFFECT OF OXYGEN IN THE CATALYTIC SYNTHESIS OF ENDOHEDRAL CARBYNE." In Proceedings of MMIT’23 International Conference 25 May 2023y. Tashkent International University of Education, 2023. http://dx.doi.org/10.61587/mmit.uz.vi.49.

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Carbyne, a novel carbon nanostructure, has drawn considerable attention in modern nanotechnology due to its unique physical properties. Despite the successful synthesis of carbyne through various methods, the mechanisms behind carbon monoxide-dependent catalytic synthesis of endohedral carbyne remain poorly understood. In this simulation-based study, we investigate the synthesis of endohedral carbyne dependent on C and CO radicals in the presence of a Ni5 catalyst inside double-walled carbon nanotubes of (5,5)@(10,10) structure. Our results show that the introduction of the C atom leads to the formation of a long carbon chain within the Ni5@(5,5)@(10,10) model system. In contrast, in the case of CO radicals, the carbyne chain growth is hindered due to the oxidation of nickel clusters by oxygen atoms after the initial nucleation stage. Our findings are consistent with previous theoretical, simulation, and experimental studies, and offer valuable insights into the synthesis of carbyne-based nanodevices for future nanotechnology.
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Kovalchuk, A. A., N. N. Rozhkova, and A. V. Prikhodko. "Oxygen sensitive graphene-based carbon films." In 2020 International Conference Laser Optics (ICLO). IEEE, 2020. http://dx.doi.org/10.1109/iclo48556.2020.9285921.

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Valkovic, Vladivoj, Davorin Sudac, Karlo Nad, and Jasmina Obhodas. "Small scale variations in carbon oxygen ratio." In 2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA). IEEE, 2013. http://dx.doi.org/10.1109/animma.2013.6727944.

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Blomgren, Jan, P. Mermod, M. Hayashi, L. Nilsson, S. Pomp, A. Ohrn, Michael Osterlund, Alexander V. Prokofiev, and U. Tippawan. "FAST NEUTRON SCATTERING ON CARBON AND OXYGEN." In International Workshop on Fast Neutron Detectors and Applications. Trieste, Italy: Sissa Medialab, 2007. http://dx.doi.org/10.22323/1.025.0071.

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Kolesnikova, Anna, and Kristina A. Prikhodchenko. "Mechanical properties of oxygen-doped porous carbon nanostructures." In Reporters, Markers, Dyes, Nanoparticles, and Molecular Probes for Biomedical Applications X, edited by Samuel Achilefu and Ramesh Raghavachari. SPIE, 2018. http://dx.doi.org/10.1117/12.2284652.

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Pou Liu, F. Arai, and T. Fukuda. "Nanofabrication of Carbon Nanotubes Assisted with Oxygen Gas." In 2006 Sixth IEEE Conference on Nanotechnology. IEEE, 2006. http://dx.doi.org/10.1109/nano.2006.247708.

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COLLINS, PHILIP G., MASAHIRO ISHIGAMI, and A. ZETTL. "ELECTRONIC EFFECTS OF OXYGEN ADSORPTION ON CARBON NANOTUBES." In Proceedings of the International Symposium. WORLD SCIENTIFIC, 2000. http://dx.doi.org/10.1142/9789812793805_0052.

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Zhang, LiYang, GuoSheng Wen, GuoMo Zhou, RuMing Zhang, and XiaoJun Li. "Carbon fixation and oxygen release of Phyllostachys pubescens." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5964240.

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Reports on the topic "Oxydes de carbon"

1

Miller, James Edward. Initial case for splitting carbon dioxide to carbon monoxide and oxygen. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/926371.

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Author, Unknown. L51569 Hyperbaric Shielded Arc Welding. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), April 1987. http://dx.doi.org/10.55274/r0010561.

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A series of both manned and unmanned welds were completed in a hyperbaric chamber for depths between 100-500 feet. The effect of SMA welding with DEEN specifically, the weld metal carbon and oxygen levels, weld strength and ductility, weld metal toughness and HAZ hardness.Cranfield Institute of Technology
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Rabinowitz, Joshua D., Ned S. Wingreen, Herschel A. Rabitz, and Yifan Xu. Integration of Carbon, Nitrogen, and Oxygen Metabolism in Escherichia coli. Fort Belvoir, VA: Defense Technical Information Center, October 2012. http://dx.doi.org/10.21236/ada575710.

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Dana, V. Line Intensities and Self-Broadening Coefficients of 12 Carbon 16 Oxygen(2) and 13 Carbon 16 Oxygen(2) Lines in the Laser Band Region. Fort Belvoir, VA: Defense Technical Information Center, March 1992. http://dx.doi.org/10.21236/ada248612.

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Surendranath, Yogesh. Tunable Oxygen Reduction Electrocatalysis by Phenazine-Modified Carbons. Office of Scientific and Technical Information (OSTI), March 2022. http://dx.doi.org/10.2172/1859742.

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Berner, Robert A. Plants, Weathering, and the Evolution of Atmospheric Carbon Dioxide and Oxygen. Office of Scientific and Technical Information (OSTI), February 2008. http://dx.doi.org/10.2172/923048.

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DePuy, C. H., and V. M. Bierbaum. Gas Phase Ion-Molecule Chemistry of Carbon, Nitrogen and Oxygen Compounds. Fort Belvoir, VA: Defense Technical Information Center, January 1985. http://dx.doi.org/10.21236/ada152876.

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Kirchstetter, Thomas. A Rechargeable Carbon-Oxygen Battery for Efficient, Low-Cost Energy Storage. Office of Scientific and Technical Information (OSTI), March 2021. http://dx.doi.org/10.2172/1773483.

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Doctor, R. D., J. C. Molburg, and P. R. Thimmapuram. KRW oxygen-blown gasification combined cycle: Carbon dioxide recovery, transport, and disposal. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/373835.

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Hartwig, J. F. Synthesis and reactivity of compounds containing ruthenium-carbon, -nitrogen, and -oxygen bonds. Office of Scientific and Technical Information (OSTI), December 1990. http://dx.doi.org/10.2172/5530662.

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