Global ETD Search
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Showing 1 to 12 of 12 for “"carbon monoxide oxidation"”.
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Dynamics of Carbon-Monoxide Oxidation on Platinum
This work presents a study of kinetics of CO oxidation on a platinum ribbon in a gradientless reactor. An isothermal condition was maintained on the catalyst surface. The reaction rate was measured by a calorimetric technique, and measurements of the effluent CO(,2) concentration were made with an …
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Electrochemical studies of carbon monoxide oxidation on platinum and platinum based fuel cell catalysts
Electrochemical studies of carbon monoxide (CO) oxidation on surfaces of bulk platinum (Pt) and Pt based particle catalysts were conducted. Investigations focused on understanding relationships between surface characteristics of Pt electrodes and the oxidation kinetics of monolayer quantities of …
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Identity and dynamics of the microbial community responsible for carbon monoxide oxidation in marine environments
… simple chemical species are produced, including carbon monoxide (CO). The ocean surface water is saturated with respect to CO, and is thus a source of CO to the atmosphere. CO reacts with and removes free-radical compounds, and may itself contribute to the 'greenhouse' gas content of the …
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Carbon Monoxide Oxidation on Nanoparticle Catalysts and Gas Phase Reactions of Small Molecules and Volatile Organics with Metal Cations
… and unsupported nanoparticle catalysts for CO oxidation. The method is based on the Laser Vaporization/Controlled Condensation (LVCC) technique. The first part of this dissertation presents the vapor phase synthesis and characterization of gold nanoparticles supported on a variety of oxide …
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Mechanism of carbon monoxide oxidation at the active site [Ni-4Fe-5S] cluster of carbon monoxide dehydrogenase from Carboxydothermus hydrogenoformans
The carbon monoxide (CO) metabolism relies on CO-dehydrogenase (CODH) that oxidizes CO with H2O to CO2. The crystal structures of the native Ni-Fe CODHIICh from the CO-grown thermophilic hydrogenogenic anaerobic bacterium Carboxydothermus hydrogenoformans reveal the active site as a [Ni-4Fe-5S] …
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Activity Studies of NI-AU And CO-AU Bimetallic Clusters on TIO2 (110)
… catalytic processes. Activity of methanol and carbon monoxide oxidation on Co-Au and Ni-Au bimetallic clusters on a TiO2 (titania) support was examined under ultra-high vacuum (UHV) conditions, to determine the mechanism of oxidation. On a pure gold surface, the O-H bond is broken, and the …
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Oxidation of Carbon Monoxide Over Ceria and Alumina Supported Palladium Catalysts
… were studied for efficacy in low temperature carbon monoxide oxidation. Calcination temperatures were varied between 500-900°C for alumina supported catalysts and shown to have no significant difference in activity. X-Ray Photoelectron Spectroscopy studies revealed structural changes …
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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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Gold based electro catalysts
… are explored for the oxygen reduction, ethanol oxidation and carbon monoxide oxidation reactions (Chapter four). The results show the oxygen reduction and ethanol oxidation reactions were favoured using larger particles, 6 nm in diameter, whilst the CO oxidation reaction was more facile on …
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Genetic analysis of DMSP metabolism in the marine Roseobacter clade
… AcuI- mutants failed to grow on acrylate as sole carbon source and were more sensitive to its toxic effects. AcuI- mutants failed to grow on DMSP so, surprisingly, Ruegeria likely uses lyase pathway(s) to grow on this compound. A potential regulatory gene, transcribed divergently from dmdA, was …
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Gold-nickel surface alloy chemistry with oxygen and carbon monoxide
Key to low temperature carbon monoxide oxidation on gold-nickel random surface alloys is molecularly (rather than atomically) adsorbed oxygen, and weakly bound carbon monoxide. To characterize these adsorbates, saturation coverages of each diatomic on Au-Ni(111) held at 80 K are separately measured …
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Continuous synthesis of metallic and oxidic palladium nanoparticles with tunable sizes for catalytic applications
… catalytic active sites, optimal metal oxidation states and nanoparticle sizes for the different reactions, as well as understanding the dynamic behaviour of this system. Furthermore, differences between systems operating under realistic conditions using a full gas mixture, as opposed to …