Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 25 for “"Direct Oxidation"”.
-
Direct oxidation of methane to methanol
… and the discovery of new catalysts that can directly oxidise methane to methanol are of great scientific importance. The total oxidation of methane to CO2 is considered for amorphous surface palladium oxide. A partially oxidised palladium surface is found to have both metal-like and …
-
Thermal Analysis of Binding of Organic Pollutants to Titanium Dioxide
… degradation, which occurs either through direct oxidation by holes or via indirect oxidation by radical messengers. Titanium dioxide can oxidize substrates directly through hole oxidation mechanisms or indirectly through free radical mechanisms. Substrates must bind onto the catalyst …
-
Synthesis and characterization of novel polyaniline/metal composites
… These studies provide a simple method for the direct oxidation of aniline by these metal species and simultaneous formation of bulk quantities of PANI/Au and PANI/Pt composites, respectively. Studies of the PANI/Au composite indicate that the properties of the polymer are consistent with more …
-
Structural, electrical and optical studies on the effects of rapid thermal processing on silicon-germanium-carbon films
… But the chance of forming SiC precipitate in oxidation case was greatly reduced due to CO or CO2 outdiffusion. As far as Ge was concerned, similar to the oxidation of Si1i?-xGex, direct oxidation of Si1i?-xi?-yGexCy alloy led to Ge pilei?-up at oxide/epitaxial-layer interface. Electrical …
-
Progress towards the enantioselective total synthesis of trichodermamide B
… herein that it is formed in vivo through direct oxidation of phenylalanine to the arene oxide or arene dioxide intermediate, which is then opened via nucleophilic attack of an oxime. To probe the feasibility of this biosynthetic hypothesis, a series of bioinspired approaches to …
-
A study of the high speed diesel engine exhaust with respect to gas composition and smoke density
… Fahrenheit) 3. The so-called “chilling of direct oxidation reactions” were experienced at maximum brake horsepower check. 4. Smoke density increased with an increase in fuel-air ratio at ratios above .04. The cooling temperature effect was negligible. 5. There was a relationship between …
-
The Effects of the Molecular Weight and the Environment of Antioxidants on their Efficiency
… optimum chemical efficiency in preventing these oxidation processes. However, it has become apparent over recent years that other factors, physical rather than chemical in nature, are of primary importance in determining the activity of antioxidants. The present work has involved an investigation …
-
Molecular and Functional Regulation of Akt2 by Oxidation
… however, the functional contribution of oxidation in signaling regulation under physiologically-relevant conditions of growth factor/cytokine stimulation has not been fully demonstrated, despite the emerging knowledge of redox-sensitive protein targets. In the following study, …
-
Synthesis and chemistry of 1,4-oxathianes and 1,4-oxathian-3-ones
… either ring closure of the sulfide followed by oxidation to the sulfone or oxidation to the sulfone followed by cyclization. However, these routes were to prove unsuccessful. The second pathway involved the use of a readily available epoxide for the afore mentioned cyclization/oxidations. The …
-
Exploring transition metal chalcogenides for bio sensing and environmental remediation
… also been employed as an electrocatalyst for the direct oxidation of glucose. A high sensitivity of 18.89 mA mM<sup>-1</sup> cm<sup>-2</sup> at low applied potential of 0.35 V vs. Ag|AgCl is achieved. For the same application, we investigated Ni<sub>3</sub>Te<sub>2</sub>. With electrodeposition …
-
Reductive and oxidative dissociative electron transfers: transition between the concerted and stepwise mechanistic pathways
… computational techniques. Results for both the direct electrochemical (linear sweep voltammetry and convolution voltammetry) and indirect electrochemical (homogeneous redox catalysis) reductions of the epoxyketones are presented. In cases where the ring-closed radical anion generated by …
-
A Numerical Model (SEAM3D) to Assess the Biotransformation of Chlorinated Ethenes at a TCE/BTEX Contaminated Site
… the extent to which reductive dechlorination and direct anaerobic oxidation were responsible for the biotransformation of the chlorinated ethenes. Reductive dechlorination accounted for the 100%, 98.3%, and 97.5% of the biotransformation of TCE, DCE, and VC respectively. Direct anaerobic oxidation …
-
Studies toward the synthesis of celastrol and the late-stage hydroxylation of arenes mediated by 4,5-dichlorophthaloyl peroxide
… synthesis of a phenolic compound entails the direct oxidation of an aryl C-H bond remains to be a difficult synthetic challenge. Following our initial report describing the hydroxylation of arenes using phthaloyl peroxide, new peroxide derivatives were investigated to probe their reactivity in …
-
Cycling studies of micro-tubular solid oxide fuel cells
… propagation due to severe expansion and direct oxidation of the Ni anode were propounded. Several experiments were designed to illustrate the degradation phenomena. The first was isothermal (steady state) ageing, which was performed to provide a benchmark of degradation for easy …
-
Biochemical and Genetic Characterization of Reduced Phosphorus Metabolism in Pseudomonas Stutzeri WM88
… The biochemical analysis of hypophosphite oxidation indicates that HtxA is a hypophosphite/2-oxoglutarate dependent dioxygenase which catalyzes the direct oxidation of hypophosphite to phosphite and requires 2-oxoglutarate, oxygen, and ferrous ions for activity. PtxD is a novel member of …
-
The Development of Energy Efficient Wastewater Treatment: Electrochemical Oxidation and PFACs liquid-liquid Extraction
… techniques that can oxidize organic compounds by direct oxidation and indirect oxidation (hydroxyl radical HO•) on the anode. The benefits of EAOPs are: 1) They are driven by electric power. The stoichiometric connection between power consumption and pollutant removal in EAOP is almost linear. …
-
Non-heme iron C-H oxidation: tolerance of nitrogen-containing motifs with application to amino-acid and peptide oxidation
Direct oxidation of C-H bonds using non-heme iron catalysis has proven to be a highly useful transformation since its development in recent years. The ability to directly install oxygen into a hydrocarbon framework negates the need for pre-oxidized materials, and allows for quick and efficient …
-
Gas-Phase Epoxidation of Ethylene and Propylene
… for catalytic performance in the gas-phase direct oxidation of ethylene to ethylene oxide. For this study, which used no promoters, ethylene oxidation selectivity of SiC-supported catalysts ranged from 10 to 60% and conversion from 0-4.5%. Silicon carbide supported catalysts exhibited poor …
-
The Biogeochemistry of Iodine in Seawater
… may also vary seasonally. The conversion (or oxidation) of iodide to iodate is thermodynamically feasible, but the mechanism is poorly known. Hydrogen peroxide, which is ubiquitous in surface seawater, may oxidize iodide to iodate.</p> <p>Water samples were collected in the middle and lower …
-
Metabolic basis for the preferential utilization of disaccharide, by the cellulose-decomposing bacterium, cellvibrio gilvus (nov. sp.)
… cellobiose immediately and the rate of glucose oxidation was 10% less than obtained from cellobiose. Thus, hypotheses that adaptive hexokinase, hexokinase deficiency or impermeability to glucose could explain the preference were dispelled. Oxygen assimilation ratios of equivalent amounts of …
Page 1 of 2