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 42 for “"Oxidation of Methane"”.
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Direct oxidation of methane to methanol
Methane is an abundant earth resource important for the energy sector. The development of better catalysts for the complete combustion of methane and the discovery of new catalysts that can directly oxidise methane to methanol are of great scientific importance. The total oxidation of methane to …
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Partial oxidation of methane over halogen modified palladium catalyst.
The vapor phase air oxidation of methane to formaldehyde was investigated in an isothermal integral flow reactor at atmospheric pressure in a temperature range of 390° to 510°C. The catalyst, 0.5% palladium supported on alumina, was modified by a constant and continuous supply of small …
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Catalytic Oxidation of Methane Over Alumina Supported Palladium Oxides
<p>The objectives of this research include development and characterization of alumina supported palladium oxide catalysts for low temperature catalytic oxidation of methane. The catalysts were prepared by various methods and then characterized and screened to select the best catalyst for further …
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The aerobic, water-assisted selective oxidation of methane over platinum-based catalysts
The selective oxidation of methane to C1-oxygenates such as methanol, formaldehyde and dimethylether remains one of the grand challenges of catalysis chemistry, due to the difficulty in attaining high selectivities at high methane conversions. This has been attributed to the higher reactivity of …
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Catalytic, low temperature oxidation of methane into methanol over copper-exchanged zeolites
As production of shale gas has increased greatly in the United States, the amount of stranded shale gas that is flared as carbon dioxide has become significant enough to be considered an environmental hazard and a wasted resource. The conversion of methane, the primary component of natural gas, …
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Partial and Total Oxidation of Methane in Monolithic Catalysts at Short Contact Times
The feedstocks of natural gas exceed the resources of crude oil by far. Therefore, there is a strong interest in the utilisation of natural gas with its main component methane for the production of more useful chemicals. This leads to a strong demand for compact and low-capital-cost reactors for …
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Selective oxidation of methane in a trickle bed reactor over a platinum-based catalyst
The direct on-site conversion of methane to methanol could provide a more cost-effective and less energy-intensive utilization of natural gas compared to the industrial two-step syngas based route. Despite the numerous approaches investigated for direct methane to methanol (DMTM) conversion in the …
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First-principles simulations of the oxidation of methane and CO on platinum oxide surfaces and thin films
The catalytic oxidation activity of platinum particles in automobile catalysts is thought to originate from the presence of highly reactive superficial oxide phases which form under oxygen-rich reaction conditions. The thermodynamic stability of platinum oxide surfaces and thin films was studied, …
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Elucidation of the Catalytic Partial Oxidation of Methane Utilizing the One-of-a-Kind Catalytic Shock Tube Technique
<p>The mechanism for the catalytic partial oxidation of methane has been debated in scientific literature for over 20 years. This is a seemingly simple reaction producing CO, CO<sub>2</sub>, H<sub>2</sub> and H<sub>2</sub>O through either partial oxidation followed by complete oxidation or complete …
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Enhanced Methane Oxidation Catalysis Through Feed Modulation And Oxygen Storage
The elimination of uncombusted CH4 from Natural Gas Vehicle emissions is necessary to meet future greenhouse gas regulations, requiring the development and optimization of novel methane oxidation catalyst. In this project, the catalytic oxidation of methane is examined under lean and stoichiometric …
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Element substituted aluminophosphates
This dissertation reports the findings of an investigation aiming to the incorporation of the transition elements: cobalt, vanadium, and molybdenum into AlPO₄-5 molecular sieves, to the study of the redox properties of the resulting materials and to the potential application of these compounds in …
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Calcium isotope insight into the global carbon cycle
Over the course of my PhD, I developed the analytical capability to measure calcium isotopes at the University of Cambridge and analyzed calcium isotopes in a range of fluids and minerals in modern and past environments. After discussing my methodological development, I report my work in the …
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Development of supported nanocatalysts for hydrogen production technologies
In this thesis, the development of nanocatalysts for two different hydrogen production technologies is described. In the first part, a series of supported Ni-Co catalysts were tested for activity in the catalytic partial oxidation of methane to hydrogen/syngas. A 2 wt.% Ni 1 wt.% Co bimetallic …
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A fundamental study of model fuel conversion reactions in sub and supercritical water
… were examined to improve our understanding of chemical transformations in this high temperature and pressure environment. Results have a direct impact on present and future hydrothermal fuel conversion research for a range of fossil-based and bio-mass based feed stocks. Methane was chosen as …
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The Direct Dissociation of Methanol on V(100) Surfaces
<p>The study of dissociating methanol on vanadium surfaces was investigated in order to provide insight into reaction pathways for methane dissociation and partial oxidation into other feedstock chemicals. The construction of a custom-designed ultrahigh vacuum chamber was done to permit surface …
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Optimal Control of a Reactive Stagnation Point Flow on a Catalytic Plate
… research area. In many cases the transport of the chemical species to and from the catalyst is also important. Therefore it is necessary to couple the equations for the surface reactions with the equations of the flow field. One experimental configuration, which has received much attention …
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Computational design, sensitivity analysis and optimization of fuel reforming catalytic reactor
In this research, the catalytic combustion of methane is numerically investigated using an unstructured, implicit, fully coupled finite volume approach. The nonlinear system of equations is solved by Newton’s method. The catalytic partial oxidation of methane over a rhodium catalyst in one channel …
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A study of the tropospheric oxidation of volatile organic compounds using chemical ionization mass spectrometry
The mechanisms and kinetics of reactions important to the troposphere have been investigated using a high pressure, turbulent, discharge-flow technique coupled to a chemical ionization mass spectrometer. The ability to accurately model tropospheric chemistry depends on kinetic and mechanistic …
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Investigating the Distribution and Biosynthesis of Modified F<sub>430</sub> Cofactors in Methanogenic and Methanotrophic Archaea
Methanogenesis is the biological production of methane and is utilized by methanogenic archaea (methanogens) to generate energy. This process is responsible for 70% of total atmospheric methane, a potent greenhouse gas and an important energy source (natural gas). In the future, reversing …
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