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.
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Showing 1 to 20 of 27 for “"Aerobic Oxidation"”.
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Vanadium-Catalyzed Aerobic Oxidation of Diols and Lignin Models/Extracts
… Such processes are likely to include selective oxidation catalysis. The aim of this Thesis is to advance the state-of-the-art for the oxidation of lignin models and lignin extracts using homogeneous catalysts based on vanadium, an inexpensive and abundant transition metal, using air as the only …
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Understanding the promotion of aerobic oxidation of benzyl alcohol over Pt-based catalysts
… to the existing methodologies for the oxidation of alcohol substrates to aldehydes, ketones and/or carboxylic acid products. However, a potential risk is apparent upon the use of volatile and flammable organic solvents, specifically in the presence of molecular oxygen. This makes the …
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Synthesis of Heterometallic nitridoruthenium(VI) Complexes With Nickel, Palladium, or Platinum: New Catalysts for the Aerobic Oxidation of Alcohols
… 2Pd((-)-sparteine)] as a catalytic aerobic oxidant of organic alcohols is explored. The complex [PPh4][Ru(N)Me2(mu2 -O)2Pd((-)-sparteine)] oxidizes aryl and allyl alcohols to their corresponding aldehydes. The complex also catalytically rearranges allylic alcohols to their …
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Photochemical Oxidation Studies of Porphyrin Ruthenium Complexes
… important, attractive and efficient catalytic oxidation reactions. Many transition metal catalysts have been designed to mimic the predominant oxidation catalysts in nature, namely, the cytochrome P450 enzymes. Ruthenium porphyrin complexes have been the center of this research and have …
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Fluorinated Metallo Phthalocyanines for Chemical and Biological Catalysis
<p>The rational design of robust oxidation catalysts based on organic molecules is hindered by the presence of labile C-H bonds. We have shown recently that replacing all C-H bonds by a combination of fluoro- and perfluoro-groups in a bioinspired Cytochrome P450 model based on a phthalocyanine, Pc, …
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One-Pot Synthesis of meta-Substituted Phenols via Palladium-Catalyzed Suzuki-Miyaura Cross-Coupling and Oxidation
… with boronic acids, followed by aerobic oxidation of the resulting enone. This method is also suitable for the synthesis of meta- and ortho-disubstituted phenols, which have so far been especially difficult to access using existing synthetic methods. The scope of the reaction was …
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Investigation of montmorillonite clay-mediated reactions of aldehydes
… of aliphatic aldehydes; (3) the oxidation of aliphatic aldehydes to the corresponding carboxylic acids; (4) the addition of allyltrimethylsilane to electron deficient benzaldehydes to give homoallylic silyl ethers. The hetero-Diels-Alder and allyl silation reactions are effected …
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Synthesis, Kinetic and Photocatalytic Studies of Porphyrin-Ruthenium-Oxo Complexes
… a variety of important biological and catalytic oxidation reactions. Many transition metal catalysts have been designed to mimic the predominant oxidation catalysts in Nature, namely the cytochrome P450 enzymes. Ruthenium porphyrin complexes have been the center of the research and have …
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Energy-efficient Wastewater Treatment by Microbial Fuel Cells: Scaling Up and Optimization
… considered as a passive aeration for further aerobic oxidation of organics and nitrification. Based on several bench-scale studies, a 200-L scale MFC system with passive aeration process has been developed for treating actual municipal wastewater after primary clarification. The integrated …
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Synthesis and characterisation of carbon supported gold catalysts prepared by ion-exchange
… (Kirk-Othmer, 1995). Industrially, the aerobic oxidation of glucose is an enzyme catalysed process. However, due to the low productivity of the glucose fermentation process, the development of a chemical route is of interest. Gold catalysis provides a promising alternative route which …
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Kinetic analysis of thiol oxidation to study the effects of fluorinated groups on metal phthalocyanine catalysts
The oxidation of thiol (RSH) to disulfide (RSSR) is important biologically and industrially. Corrosive and malodorous thiols exist as contaminants in wastewater discharge from mining facilities, pulp and paper mills, tanneries, and oil refineries. The elimination of thiols from petroleum products …
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SUSTAINABLE CATALYSIS VIA IRON AND ZINC COMPLEXES: FROM TUNABLE METALLATE SYSTEMS TO PHOTOCHEMICAL REACTIVITY
… of iron complexes as catalysts for photochemical oxidation. In the first part of the work, tetrahalometallate complexes of iron and zinc were employed as bifunctional catalysts for the cycloaddition of carbon dioxide to aziridines and epoxides, yielding oxazolidinones and cyclic carbonates, …
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Tuning Heterogeneous Catalysis Using Interfacial Polarization
… Specifically, we demonstrate that thermochemical aerobic oxidation catalysis in water is mediated via spontaneous interfacial polarization induced by the coupling of constituent electrochemical half-reactions (Chapter 4). Additionally, exploiting driven-polarization to induce the non-equilibrium …
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Phytoplankton productivity and Milankovitch Cycles in the Cenomanian-Turonian Bridge Creek member of the Greenhorn Formation in southeastern Colorado
… During times of high primary productivity, the aerobic oxidation of large amounts of organic matter settling to the sea floor may have consumed the oxygen available at depth creating an anaerobic environment and facilitating the preservation of organic carbon. Riverine input to the seaway also …
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The development of alkoxy-based sol-gel processing for magnetoresistive manganite thin films
… for the first time, were free from products of aerobic oxidation, and hence, contained no brown discoloration. A partial hydrolysis of h = 0.25 produced a polymeric sol system, conferring both spinnable viscosities and excellent sol longevity. Post-coating hydrolysis via humidified air proved …
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Production of Light-independent Reactive Oxygen Species during Microbially-mediated Fe(II)/Fe(III) redox cycling and its Application in the Degradation of Organic Contaminants
… of various organic contaminants during aerobic oxidation of Fe(II) species without addition of exogenous peroxide has also been demonstrated, suggesting that oxidation of natural organic matter and organic contaminants may occur naturally at redox interfaces. In redox-dynamic …
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Gas Phase Oxidation of Levulinic Acid for the Production of Maleic Anhydride over Supported Vanadium Oxide Catalysts
… end products. In this context, we examine the aerobic oxidation of levulinic acid, a bio-based platform chemical derived from lignocellulosic biomass, to produce maleic anhydride, a valuable commodity chemical. This process is carried out over supported vanadium oxide catalysts. Yields as high …
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The photo-oxidation of benzyl alcohol over TiO2 and Pt TiO2 and the effect of reaction conditions
… benzaldehyde is commonly produced by the oxidation of benzyl alcohol (B-Alc) using stoichiometric amounts of hazardous oxidants such as chromates. The selective, photocatalytic oxidation of benzyl alcohol offers a promising, more environmentally friendly method of producing benzaldehyde. …
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Electrochemical and Photocatalytic Flow Strategies for Sustainable Substrate Oxidation
… under continuous flow. An investigation into the aerobic oxidation of a variety of organic substrates was made, and a comparison between the performance of batch and flow CNx photoreactors was conducted. Design of the initial flow prototype involved some computational fluid dynamics analysis and …
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