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 “"Platinum group metals"”.
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Flow-injection analysis of the platinum-group metals
… principle methods for the determination of the platinum-group metals (PGMs) use an "off-line" assay with flame-atomic absorption spectrometry and visible spectrometry. Both suffer numerous interferences and involve time-consuming and arduous laboratory separation methods prior to analysis. An …
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Biorecovery of platinum group metals from three-way catalysts
Los metales del grupo del platino (PGMs), que incluyen platino (Pt), paladio (Pd) y rodio (Rh), son componentes indispensables de los catalizadores automotrices de tres vías (TWC), los cuales desempeñan un papel crucial en la mitigación de emisiones vehiculares al convertir gases nocivos como CO, …
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Platinum group metals catalyzed steam methane reforming via micro-channel reactor
Steam methane reforming is a well-established industrial process used for generating hydrogen and synthesis gas. By performing this reaction in micro-channel reactors it is possible to take advantage of increased heat and mass transfer rates, allowing equipment size and residence times to be …
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Interaction of germanium with platinum group metals in lateral diffusion couples
… thesis looks at metal-germanium systems of the Platinum Group Metals (PG Ms). It is of particular relevance to study possible applications of PG Ms in South Africa, the country being one of the major producers of these metals in the world today. The diffusion lengths in standard thin-film …
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Hydrometallurgical extraction of platinum group metals from a low-grade ore concentrate
… economic and technical feasibility of processing platinum group metals (PGMs) and base metals (BMs) from a low-grade ore concentrate produced in the concentrator plant at Lonmin Pic. The PGMs of particular interest are platinum, palladium, ruthenium and rhodium, while the BMs of interest are …
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Supporting Well-Defined Platinum Group Metals in Metal-Organic Frameworks for Heterogeneous Catalysis
… reaction kinetics, and catalyst stability. Platinum group metals (PGMs; Ru, Os, Rh, Ir, Pd, Pt) enjoy special distinction among transition metal catalysts `for their high selectivity and activity for a number of reactions of interest such as cross-coupling, oligomerization, and …
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A bottom-up prospective dynamic materials flow assessment for platinum group metals (PGM) global demand forecast
Thesis: S.M., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2014.
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Development of selective pre-concentration methodology of some of the platinum-group metals in acidic solutions, followed by their direct determination by ICP-OES
The trace analysis of the platinum-group metals in complex, severely interfering matrices, such as industrial effluent, has been the focus of much research in_the past forty years. However, despite the greater availability of much improved instrumentation, such as ICP-OES, NAA and XRF, most …
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Leaching of selected PGMs : a thermodynamic and electrochemical study employing less aggressive lixiviants
Historically the platinum group metals (PGMs) have been, and are still being dissolved by means of rather aggressive methods, e.g. aqua regia. Limited research has been conducted into the dissolution of the PGMs using different oxidizing agents. The dissolution of gold on the other hand has been …
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Thermodynamic behaviour of sulphur and chlorine as minor elements in metallurgical melts
… and conditions appropriate to the melters of the platinum group metals (PGM) producers of South Africa. New measurements have been made on the ferric to ferrous ration, sulphide capacity as well as the chloride capacity mainly for the PGM melter-type slags.
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From research to resource piloting near-Earth asteroids Through the Valley of Death
… water, which can serve as a fuel in space, and platinum group metals, which are valuable on Earth. The presence of these resources has prompted high valuations of the near-Earth asteroid population, but it is not immediately apparent if those valuations are accurate or if they can be realized. …
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Essays on the economic and financial challenges facing South Africa's commodity sector
… a different dimension of South Africa’s platinum group metals (PGM) sector. The PGM sector is an insightful case study given that it is a microcosm of a deeply unequal country, marked by distrust between three distinct spheres – political, business and labor. The first article explores …
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Annealing effects on platinum coating morphology
… application field, the metallic coatings and platinum coated systems in particular, has been studied extensively. Metallic platinum is important for many industrial applications and the demand has increased considerably in the past decade, particularly in applications such as jewellery and …
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Bio-engineered gas diffusion electrodes (GDEs) for proton exchange membrane fuel cells (PEMFCs)
The current cost and finite nature of Platinum Group Metals (PGM) is a barrier to the successful commercialisation of Proton Exchange Membrane Fuel Cells (PEMFCs). Successful mass production of fuel cell components combined with the recovery of PGMs from waste, more efficient PGM use or the …
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USE AND MACRO-MOLECULAR STRUCTURE OF SILICA POLYAMINE COMPOSITES
… through a series of experiments. Precious metals were removed from both prepared and industrial solutions to gain familiarity with the composites and to develop separation procedures. A number of methods were developed to utilize the properties of the silica polyamine composites in …
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USE AND MACRO-MOLECULAR STRUCTURE OF SILICA POLYAMINE COMPOSITES
… through a series of experiments. Precious metals were removed from both prepared and industrial solutions to gain familiarity with the composites and to develop separation procedures. A number of methods were developed to utilize the properties of the silica polyamine composites in …
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Synthesis and characterisation of carbon supported gold catalysts prepared by ion-exchange
… they do, their activity is small compared with platinum group metals. The recent interest in gold as a catalyst has been fuelled by the development of processes to deposit gold on a catalyst support as nano-crystallites (Prati and Martra, 1999). Gold catalysts with nano-crystallites on selected …
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ELECTROCATALYSTS AND SUPPORTS FOR POLYMER FUEL CELLS AND ELECTROLYZERS
… more active, cheaper catalyst than pure platinum group metals. A database of catalyst’s activities is compiled, and machine learning is applied to show how different models can optimize alloy catalysts and interpret the importance of different physical properties on catalyst activity. …
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Electrorefining of base metal refinery residue copper alloy for platinum group metal recovery
… bleed stream for minor elements from Anglo Platinum’s Base Metal Refinery (BMR) which produces copper nickel and cobalt sulphate. It contains mainly sulphur, iron jarosites, unleached base metals and platinum group metals (PGMs), which makes the treatment of SLC necessary. The SLC is …
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