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Showing 1 to 20 of 58 for “"Oxidation kinetics"”.
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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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Oxidation kinetics of molten copper sulphide
The oxidation kinetics of molten copper sulphide were investigated by quantitative measurements and qualitative observations. Off-gas analyses for SO2 and 02 were conducted to determine the oxidation rates of approximately 200-gram samples, ofmolten 99.5% Cu2S. The molten sulphide was held in …
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Asphalt Oxidation Kinetics and Pavement Oxidation Modeling
… cracking and thermal cracking, aggravated by the oxidation and hardening of asphalt. This negative impact of asphalt oxidation on pavement performance has not been considered adequately in pavement design. Part of the reason is that the process of asphalt oxidation in pavement is not well …
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Oxidation kinetics of polycrystalline SrTiO₃ and LaCrO₃
<p>"The oxidation kinetics of polycrystalline SrTiO<sub>3</sub> and LaCrO<sub>3</sub> were determined by measuring the time and temperature dependence of the weight and conductivity change of reduced samples. A region of fast diffusion followed by a reduced diffusion tail was observed in the TGA …
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The oxidation kinetics of liquid lead and lead alloys
… to determine the rates and products of oxidation in pure oxygen at temperatures of 350 to 600°C. The kinetic data were determined using a Cahn electro-balance. Liquid lead was found to follow a cubic rate of oxidation between 350 and 400°C. A parabolic rate was found at temperatures …
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Investigation of the Iron Oxidation Kinetics in Mantua Reservoir
… was used in the irrigation system, causing re-oxidation of the iron. The oxidized iron then precipitated out on the headstones causing the staining. The purpose of this investigation is to determine the iron oxidation kinetics after the re-aeration of the water which will help determine …
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Fundamental oxidation kinetics of simple compounds in supercritical water
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1990.
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Oxidation kinetics of 316l stainless steel in the pressurised water reactor environment
… this investigation measured the oxide growth kinetics of 316L stainless steel when exposed to a simulated primary water environment of a pressurised water reactor (PWR). It is generally accepted that intergranular oxidation at the surface of a metal forms a preferential site for stress …
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Oxidation kinetics of simple compounds in supercritical water : carbon monoxide, ammonia and ethanol
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1986.
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Oxidation kinetics of methylphosphonic acid in supercritical water : experimental measurements and model development
… elementary reaction mechanism, to quantify MPA oxidation kinetics in supercritical water. MPA hydrolysis and oxidation rates were experimentally measured in a laboratory-scale plug flow reactor. The effects of MPA concentration (0.5 to 1.0 mM), oxygen concentration (1.0 to 3.8 mM), temperature …
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Evaluation of the Redostat™ device for the study of ferrous iron biological oxidation kinetics.
… about a year) due to the slow heap bioleaching kinetics. It is believed that more metal values can be recovered in a shorter timeframe, if the kinetics of ferrous iron biological oxidation can be accelerated. This requires careful study of the bio-oxidation kinetics under heap-like conditions. …
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In-situ investigation of the oxidation kinetics of Fe-12Cr-2Si using time-resolved transient grating spectroscopy
… tools are then used to study the short-timescale oxidation kinetics of Fe-12Cr-2Si, a model alloy with oxide layer formation properties similar to large classes of Fr-Cr alloys. By monitoring the effect of thin oxide layers on surface thermal transport, there exists a pathway to continuously …
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Thermochemistry reaction paths and oxidation kinetics on ketonyl and aldehydic nitrogen oxides, propene and isooctane: a theoretical study
… carbon radicals from loss of hydrogen atoms, and kinetics of the tertiary isooctane radical reaction with O_2 are determined. The computed standard enthalpy of formation of isooctane from this study is -54.40 kcal mol^{-1}. The major products from reaction of the tert-isooctane radical + O_2 to …
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Effects of hydrogen uptake and yttrium doping on the oxidation of zirconium-yttrium alloys
… increased hydrogen uptake and increased oxidation kinetics. Hydrogen uptake in zirconium-based cladding under simulated reactor water chemistry has been observed to be dependent upon the alloying elements commonly used in cladding material. An inverse relationship between power-law …
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Investigations On Rf Sputter Deposited Sicn Thin Films For Mems Applications
… XPS to investigate the chemical composition and oxidation kinetics at each annealing temperature. The surface roughness of these films was studied as a function of annealing temperature and film composition with the help of a "Veeco" optical profilometer. Nano-indentation studies indicated that …
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Response of chromium and chromium-aluminum coatings on zircaloy-2 to high temperature steam
High temperature steam exposure leads to rapid oxidation of Zr based cladding, which will potentially lead to cladding failure. Our approach is to apply CrAl or Cr coatings on Zircaloy by magnetron sputtering to improve the oxidation resistance of cladding materials. The goal of this research is to …
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Reconstruction of Rhodium Clusters During CO Oxidation and Consequences on The Reaction Mechanism
… of the metal clusters and single atoms during CO oxidation. There are four main findings that will be present in this work. First, a high-flux X-ray beam can induce structural change that leads to a reduction of the metal and agglomeration of metal clusters. This finding is very important since …
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Heterogeneous Metallurgical Patterning of Semiconducting Oxide Nanostructures
… grain boundaries. The comparative thermal oxidation investigations show distinct growth of semiconductor nanowire/nanofilm network junctions on dezincified Cu70Zn30 substrates compared to the randomZnO nanowires growth on nonetched brass substrates. The grain boundary region is mostly …
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High Throughput Material Science For Discovery Of Energy-Related Materials
… the anode catalyst are degradation and slow fuel oxidation kinetics, particularly for direct alcohol fuel cells. This dissertation explains many aspects of a large-scale research project focussed at identifying superior anode catalyst materials. Effective searching of the astronomical number of …
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