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Showing 1 to 20 of 20 for “"Metal Oxidation"”.
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Infrared Radiation of Metal Oxidation Chemical Reaction Flames
Flames of metal oxidation chemical reactions, where metal vapors of alkali or alkali-earth atoms react with strong oxidizers such as the halogen or nitrous oxide molecules, have been examined for their stimulated and spontaneous infrared radiative properties. Various thermodynamic, spectroscopic, …
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Change Of Metal Oxidation State At High Temperature, Impact Of Temperature And Reactive Gases
… developed and improved. Specifically, the use of metal-based materials is critical to ensuring robust, safe, and long-term operations. For example, in power systems where boilers are used to generate steam for heat or electricity generation the use of stainless metal alloys is critical to allow …
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Conditions for Observing Infrared Chemiluminescence and the Role of Condensation in Metal Oxidation Reactions
Infrared chemiluminescence (IRCL) studies of cw metal oxidation reactions wherein metal atoms entrained in a carrier gas were mixed with an oxidizer by means of a nozzle system are described. One goal of the work was to determine the vibrational distribution of the product molecule produced by the …
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Conditions for observing IR chemiluminescence and the role of condensation in metal oxidation reactions
"Infrared chemiluminescence (IRCL) studies of cw metal oxidation reactions wherein metal atoms entrained in a carrier gas were mixed with an oxidizer by means of a nozzle system are described. One goal of the work was to determine the vibrational distribution of the product molecule produced by the …
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First-principles study of the surfaces of zirconium during early stages of metal oxidation
The surfaces of zirconium during early stages of metal oxidation were examined by first-principles calculations using density functional theory. DFT calculations suggested that the interaction between the oxide and the substrate induced a slight vertical contraction of the oxide film and a slight …
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Direct methanol fuel cell catalysts with controllable interface
… electrocatalysts for room temperature electrooxidation of methanol to prove the existence of Pt-oxophilic metal pair sites and to delineate their contributions to methanol eletrooxidation by bifunctional catalysis. Model bimetallic and multi-component catalysts with customizable and easily …
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OXIDE FILM FORMATION AND CONVERSION MECHANISM ON CARBON STEEL UNDER MILDLY BASIC CONDITIONS
… for nuclear power plants. Corrosion involves metal oxidation and dissolution, and hence, its kinetics depends on the aqueous redox condition and the physical and chemical nature of surface oxide formed during corrosion. Nuclear plant environment includes the additional challenge of fields of …
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Electrochemisty, Spectroelectrochemistry And/Or Electrosynthesis of Pi-Extended Porphyrins in Nonaqueous Media
… of which is dependent upon the specific central metal ion. Finally, meso-naphthalene substituted and meso,beta-naphthalene extended porphyrins with five different central ions were characterized as to the their electrochemistry and UV-vis spectroelectrochemistry in CH2Cl2 and PhCN containing 0.1 …
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The Challenge of Selectivity in Ethylene Oligomerization: Ligand Design and Metal Valence States
… and polymerization are all based on this metal with the exception of a few systems based on other transition metals (Zr, Ti, Ni etc.). This versatility raises interesting questions about chromium’s unique behaviour. Essentially, selective or non-selective oligomerization and polymerization …
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Synchrotron radiation as a probe of chemical information using novel experimental configurations
… data to determine the composition of mixed metal oxidation states of significant environmental consequence is described. The major advancement is a combination of in-situ data collection with novel data reduction techniques. Results from this study demonstrate that X-ray spectroscopy is a …
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The Development of New Routes to Half-Sandwich Metallatricarbadecaborane Complexes, Triflate-Functionalized Polyboranes and Carboranes, and Ammonia Borane Hydrogen Release
… the first extensive series of half-sandwich metallatricarbadecaborane complexes, (2) to synthesize and explore the reactivity of 5-TfO-B10H13, and (3) to investigate metal-catalyzed hydrogen release from ammonia borane in ionic liquids. The major achievements are outlined below. Chapter 1 …
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Hydrogen Storage in Metal Fragments grafted Silicas and Chromium Hydrazide Gels
… titanium, vanadium, and chromium organometallic fragments possessing oxidation states between (II) and (IV) were synthesized, tested for their hydrogen storage capacities, and characterized by XRD, nitrogen adsorption, XPS, and EA. The effects of the variation in the surface area, pore …
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The application of colloidal photocatalysis in actinide photoredox chemistry
… lattice sites. Photocatalytic treatment of metal ion species by such particles has a number of important commercial applications in precious metal recovery and in the removal of heavy elements from effluent streams. The selective manipulation of actinide metal oxidation states plays an …
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Continuous synthesis of metallic and oxidic palladium nanoparticles with tunable sizes for catalytic applications
… for gasoline engines and use platinum group metals, such as palladium, as the active catalyst materials and oxides such as cerium dioxide as support. Palladium and palladium-based cerium dioxide catalysts have been extensively studied in three-way catalysis due to their excellent catalytic …
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Use of Oximes and Schiff-bases as Bridging/Chelating Ligands with Select 3d and 3d/4f Ions in Cluster Chemistry and a Mechanistic Insight into the Roles of Transition Metal Ions in the Formation of Tetrazoles
… N-naphthalidine-2-amino-naphthol (nanpH2) in homometallic 3d- and heterometallic 3d/4f-metal cluster chemistry has afforded a Mn cluster and novel families of Mn/Ln and Cu/Ln complexes. In Chapter 2, the synthesis and characterization of the {MnIIIMnIV2} (1), {GdMnIV2} (2) and {DyMnIV2} (3) …
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Oxidation kinetics of metallic powders
… and propellants. Reaction mechanisms and oxidation kinetics of aluminum, magnesium and Al-Mg alloy powders in different oxidizing environments are investigated using thermo-analytical measurements. New methods of data processing are developed, relying on measured particle size …
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Reactions at coordinated ligands: redox-active ligands and coordination of Lewis acids
… at the ligand and how remote, relative to the metal, activation affects the metal center. The three approaches were the use of redox-active ligands, ligand protonation and Lewis acid coordination to ligands. The focus is on ligand design rather than substrate or metal optimization with a …
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High valent element fluorosulfates and fluoride- fluorosulfates
… superacid systems of the type HSO3F-M(SO3F)n. Metal oxidation by bis(fluorosulfuryl) peroxide (S206F2), in HSO3F, was the preferred route to these compounds. Although the polymeric M(SO3F)4 compounds were insoluble in HSO3F, they were found to be good fluorosulfate acceptors as was demonstrated …
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Synthetic, Spectroscopic, Structural and Computational Studies of Enyl and Ynyl Carbon-Rich Complexes
… describes the synthesis and analysis of organometallic complexes that feature either enyl or ynyl linkages. Chapter 1 introduces a general overview of electron transfer, classification of mixed-valence complexes and the modelling of mixed-valence complexes using density functional theory. The …
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Hydration-Induced Plasma Surface Modification of Aluminum Nanoparticles for Power Generation in Oxygen Deficient Environments
… a strategy to control energy release rates from metal particle combustion.