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Showing 1 to 20 of 20 for “"oxygen carriers"”.
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Synthetic porphyrins as oxygen-carriers
… of the haemoproteins, particularly the natural oxygen-carrier , myoglobin . Previous models, which are reviewed in the text, have usually been derivatives of mesosubstituted porphyrins. In contrast, the porphyrins used in this work were of the natural etio-substituted types, for these are …
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Interactions between catalysts and oxygen carriers in chemical looping processes
… system. In chemical looping processes, lattice oxygen is provided from a metal oxide (termed the oxygen carrier) to generate purified oxygen, or, to react with a reducing gas (e.g. a hydrocarbon) to form oxygenated products, in the absence of gaseous oxygen. The oxygen carrier is then …
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Binuclear Cobalt(ii) Complexes and Catalysis Studies on Cobalt(ii) Oxygen Carriers and Charcoal-Supported Palladium
Made available in DSpace on 2014-12-10T23:01:57Z (GMT). No. of bitstreams: 1 7500389.pdf: 4107811 bytes, checksum: 441b7b8de9b56a28cff4edf09a0bc1ad (MD5) Previous issue date: 1974
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The Effects of Hemoglobin-Based Oxygen Carriers On Mean Arterial Pressure, Arteriolar Diameter, and Nitric Oxide in the Microcirculation
… leading research is focusing on hemoglobin-based oxygen carriers (HBOCs), which are limited in clinical application due to the pressor effect they induce. In this study, the mechanisms through which HBOCs affect mean arterial pressure (MAP), arteriolar diameter, and nitric oxide levels in the …
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Investigation of the conversion of fuels in the presence of solid oxygen carriers and the development of a plasma-assisted chemical looping system for H2 production
… the conversion of fuels in the presence of solid oxygen carriers and the development of a plasma-assisted chemical looping system for H2 production’, presents the work of Yaoyao Zheng in the Department of Engineering, University of Cambridge, for the degree of Doctor of Philosophy. The thesis …
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Preparation of Copper-Based Oxygen Carrier Supported on Titanium Dioxide
<p>Chemical-looping combustion is an indirect oxygen combustion strategy, considered to be the most cost-effective power generation technology with the CO2 inherently concentrated. In this process, a solid oxygen carrier is used to transfer oxygen from the air reactor to the fuel reactor, which …
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Chemical Looping for Selective Oxidations
… of reactions (viz. abstraction or insertion of oxygen), this technology is based upon the use of oxygen carriers. These materials, typically metal oxides, reversibly store and release oxygen, and there is growing interest in using these materials for selective oxidations. This Dissertation …
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Development and characterisation of a copper-based oxygen carrier for chemical-looping with oxygen uncoupling (CLOU)
… of the resulting construct being termed the "oxygen carrier". This Dissertation is concerned with the release and uptake of gaseous oxygen when Me is copper. In particular, the interest is in the following reaction at temperatures exceeding ~900°C undertaken in a fluidised bed reactor:$\\$ …
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The Investigation of Aspects of Chemical Looping Combustion in Fluidised Beds
… in the fluidised bed; 2) properties of different oxygen carriers, Fe2O3 and CuO (with supporting materials), were tested in the fluidised bed reactor; 3) the simulation of a steady state and a dynamic model of a coal-fired CLC power plant using Fe2O3 as oxygen carriers. The Sherwood number, which …
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Fundamental Studies of Chemical Looping Combustion with Oxygen Uncoupling (CLOU) of Biomass Char
… (CLC) is a technique which utilises lattice oxygen contained in solid particles of an inorganic oxide (the ‘oxygen carrier’) to combust fuels, enabling the collection of products of combustion (CO₂ and H₂O) undiluted with nitrogen. It offers, therefore, an attractive method for capturing CO₂ …
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The effects of chemical pressurization on screen electrode fuel cells
… being used in biomedical applications as oxygen carriers in plasma, can be used to effectively raise the cathode oxygen concentration. This thesis will propose a model of perfluorocarbon emulsions as applied to an oxygen half cell. The model is first developed for the simple case of a …
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Erythrocyte-Associated Transients in Capillary PO2 in the Rat Spinotrapezius Muscle During Hemodilution with Hespan and a Hemoglobin-Based Oxygen Carrier
Hemoglobin-based oxygen carriers for use as transfusion fluids have emerged as a leading technology directed at stemming shortages of a safe blood supply and providing a readily available resuscitation fluid in various trauma situations. The purpose of this investigation was to determine the …
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Collaborative Simulation of Reacting Flow and Controller in Chemical Looping Systems
… They rely on interconnected reactors and oxygen carriers (OCs) to facilitate fuel conversion and inherent CO2 separation. However, current research methods provide limited insight into detailed in-reactor behaviours and system responses to advanced controllers, leaving operational …
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THE USE OF GASEOUS METAL OXIDE AS AN OXYGEN CARRIER IN COAL CHEMICAL LOOPING COMBUSTION
… chemical looping technologies utilize solid oxygen carriers and has some disadvantages, especially when solid fuels like coal are used. In this work, a novel chemical looping process using gaseous metal oxide as oxygen carrier was proposed. The reaction of activated charcoal with gas-phase …
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Rotary (redox) reactor-based oxy combustion chemical looping power cycles for CO₂ capture : analysis and optimization
… techno-economic performance of different oxygen carrier options for thermal plants integrated with the rotary CLC reactor. Results show that thermal coupling in the redox process increases the efficiency by up to 2% points for combined, recuperative and hybrid cycles. The studies also show …
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Evaluating new Oxygen Transfer Materials for Air Separation, Oxy-Fuel Combustion and other Processes
… the pre-dominant commercial process to produce oxygen until it was superseded by the Hampson-Linde cycle in the early $20^{th}$ century. A chemical air separation loop is characterised by the cyclic reduction and oxidation of solid material serving as an oxygen carrier, which has the capacity to …
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Computational Fluid Dynamics Modeling and Simulations of Fluidized Bed Reactors for Chemical Looping Combustion
… the coupled CFD-DEM simulations using Fe-based oxygen carriers reacting with gaseous CH4 demonstrate that chemical reactions have been successfully incorporated into the CFD-DEM approach. The simulations show a strong dependence of the fluidization performance of the fuel reactor on the density …
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Redox kinetics study for chemical-looping combustion, water and CO₂ splitting using nickel and cerium-based oxygen carrier
… production and CO2 reuse. In this process, oxygen carriers are utilized to cyclically adsorb and release oxygen producing two separated exhaust streams with desirable products. A rotary reactor design with micro-channel structure was developed in the Reacting Gas Dynamics Lab (RGDL) at MIT, …
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Studies of the effect of cysteine and heme pocket mutations of the nitric oxide dioxygenase and nitrite reductase activities of human Cytoglobin and Androglobin heme domain
Oxygen delivery to hypoxic tissues along with the interplay between hemoglobins and hypoxic tissues have been an area of interest, the nitrite reductase activity (NiR) and the nitric oxide dioxygenase activity (NOD) working in tandem is a proposed regulatory response which enhances oxygen levels in …
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Desarrollo de un nuevo proceso de combustión con captura de CO2 empleando óxidos metálicos
… of CO2 in combustion processes using solid oxygen carriers and the production of H2 with insitu capture of CO2 by combining calcium and copper looping cycles. Studies performed at conceptual and reactor modelling level, with their experimental validation at laboratory scale were carried out. …