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Dissertations / Theses on the topic 'Platinum group'

Author: Grafiati

Published: 4 June 2021

Last updated: 31 July 2024

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1

Tooze, R. P. "Organometallic compounds of platinum group metals." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37880.

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2

Isbilir, Amina. "Tridentate ligands with platinum group metals." Thesis, University of Leicester, 2018. http://hdl.handle.net/2381/42777.

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In this thesis, a series of symmetrical and unsymmetrical pincer ligands are synthesised and explored as supports for platinum group metals, such as palladium, platinum and ruthenium. In Chapters 2 and 3, the synthesis and characterisation of novel pyridine-based dianionic aryl-containing [C,NPy,O] and phenol-containing [O,NPy,O] pincer pro-ligands and their reactivity towards palladium(II) and ruthenium(II) metal precursors is described. [C,NPy,O]-type pincer pro-ligands have been shown to promote sp2 C-H activations upon reaction with palladium(II) and ruthenium(II) metal salts. Phenol-conta

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3

Roberts, Yvonne V. "Macrocyclic complexes of platinum group metals." Thesis, University of Edinburgh, 1991. http://hdl.handle.net/1842/11897.

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A series of half-sandwich complexes, [M([9]aneS<SUB>3</SUB>)*XY]<SUP>n</SUP>+ have been synthesised from MCl<SUB>2</SUB> [M = Pd, Pt,X = Y = Cl<SUP>-</SUP>(n = 0), PPh<SUB>3</SUB>0.5dppm, 0.5dppe,0.5x2, 2'-bipy(n = 2), X = Cl<SUP>-</SUP>, Y = PPh<SUB>3</SUB>(n&61 1); M = Pd, X = Y = 0.5oxytriphos, 0.5x1, 10-phen(n = 2), X = Cl<SUP>-</SUP>, Y = PCy<SUB>3</SUB>(n = 1)]. All but one of the crystal structures [M = Pd, X = Y = Cl<SUP>-</SUP>, PPh<SUB>3</SUB>, 0.5dppm, 0.5oxytriphos, 0.5x2,2'-bipy, 0.5x1,10-phen, X = Cl<SUP>-</SUP>, Y&61 PPh<SUB>3</SUB>; M = Pt, X = Y&61 PPh<SUB>3</SUB>, 0.5dppm] so

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4

Xiao, Zhixian 1970. "Characterizing the gravity recoverable platinum group minerals." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115859.

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Modeling gravity recovery of platinum group minerals (PGMs) in the grinding circuit is based on three components: Ore characterization of gravity recoverable platinum group minerals (GRPGM), their behavior in grinding mills and hydrocyclones, and the performance of the gravity recovery units. This thesis focuses on the first two components.<br>A laboratory methodology to characterize gravity-recoverable platinum group minerals (GRPGMs) in an ore with four incremental liberation and recovery stages was developed. It was applied to quantify GRPGM content of four ore samples from Canada. To measu

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5

Fotheringham, John David. "Heterobimetallic complexes of the platinum group metals." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/10906.

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6

Tadie, Margreth. "An electrochemical investigation of platinum group minerals." Doctoral thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15748.

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The Bushveld complex is the largest ore body in the world hosting platinum group elements (PGEs). It is a stratified orebody with three major reefs namely, the Merensky reef, UG2 reef and the Platreef. Platinum and palladium are the most abundant PGEs found in the Bushveld complex. They occur in the form of minerals/mineral phases with elements such as sulphur, tellurium, arsenic and iron. These minerals/mineral phases are associated with base metal sulphides occuring along grain boundaries. Unlike the Merensky and UG2 reef, the Platreef is almost barren of PGE sulphides and the distribution o

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7

Sekota, Mantoa Makoena C. "Catalytic reactions of platinum group metal phthalocyanines." Thesis, Rhodes University, 1999. http://hdl.handle.net/10962/d1006151.

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The voltammetric behaviour of I-cysteine and other organic compounds such as hydrazine, hydroxylamine and methionine has been studied on GCE modified with phthalocyanine complexes of osmium, rhodium and ruthenium. For cysteine oxidation, the catalytic activity of the electrode was dependent the nature of the axial ligand. When cyanide and dimethylsulphoxide (DMSO) were used as axial ligands, giving (DMSO)(Cl)Rh(III)Pc, [(CN)₂Rh(III)Pc], (DMSO)₂0S(II)Pc and [(DMSO)₂Ru(II)Pc].2DMSO complexes, the peak current increased with repetitive scanning, indicating the increase in catalytic activity of th

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8

Smale, Simon. "Study of the hydrogen evolution reaction on platinum and platinum group metal surfaces." Thesis, Cardiff University, 2008. http://orca.cf.ac.uk/54760/.

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The hydrogen evolution reaction (HER) has been examined on a variety of Pt and Pt-group metal surfaces to investigate the rate of the reaction. Pt stepped single crystal surfaces were investigated in relation to the HER using cyclic voltammetry, linear sweep voltammetry and multi-frequency AC voltammetry. It was found that the hydrogen evolution reaction activity did not show a dependence on the structure of single crystal platinum electrode surfaces. Thick films of Au, Rh and Pd were deposited onto Pt {111} and successfully annealed to give pseudomorphic surfaces of the bulk metal. The aim of

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9

Harding, Nigel Anthony. "β-thia-alkyl complexes of platinum group metals". Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283721.

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10

Scanlan, Thomas Huw. "Platinum group chemistry of iminophosphines and related ligands." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391972.

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11

Bell, Michael Niall. "Organometallic platinum group metal complexes incorporating macrocyclic ligands." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/13895.

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12

Trenholme, W. J. F. "Metal-organic frameworks for platinum group metal extraction." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/32795/.

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This Thesis describes the synthesis and characterisation of a variety of functionalised metal-organic frameworks (MOFs). These MOFs have been used for the extraction of platinum group metal (PGM) compounds from aqueous and organic solvents and for the storage of gases such as CO2, CH4 and the C2 hydrocarbons. Chapter 1 contains an introduction to PGM properties and uses with specific focus on the chemical properties which allow for separation of PGMs from base metal compounds and for separation between different PGM compounds. The synthesis and structure prediction of MOFs is then introduced,

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13

Auer, Derek. "Flow-injection analysis of the platinum-group metals." Doctoral thesis, University of Cape Town, 1995. http://hdl.handle.net/11427/17511.

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Includes bibliographical references.<br>To date the 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 "on-line" method for the rapid assay of the PGMs is indeed a lacking component in the analysts' repertoire of methods. This study describes the development of spectrophotometric methods for the determination of the PGMs using flow-injection analysis (FIA

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14

Bradley, Ena. "Electrochemistry of platinum group metals in ionic liquids." Thesis, Queen's University Belfast, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.705896.

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15

Garrioch, Rhona Margaret. "Isomerisations of group 10 metallacarboranes." Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/582.

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16

Van, Dyk Jacobus Barend. "A detailed kinetic and mechanistic investigation of the multi-step oxidation of [PtIICl4]2- by [IrIVCl6]2- in acidic medium." Thesis, Stellenbosch : Stellenbosch University, 2013. http://hdl.handle.net/10019.1/95481.

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17

Li, Tong. "Atomic scale characterisation of platinum group alloy catalyst materials." Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.669976.

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18

Harlow, Karsten James. "Imidazolidene and alkylidene complexes of the platinum group metals." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.313729.

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19

Rioche, Cyrille Christophe. "An investigation of platinum group metals for environmental catalysis." Thesis, Queen's University Belfast, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.492038.

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Environmental concerns and more stringent regulations have stimulated the development of new cleaner technologies to decrease the emissions of greenhouse gases and other hazardous gas emissions. In this study, the steam reforming of biooil as well as NOx storage and reduction catalysts were investigated. The production of hydrogen by steam reforming of bio-oils obtained from the fast pyrolysis of biomass requires the development of efficient catalysts able to cope with the complex chemical nature of the reactant. Steam reforming of a few model compounds and that of an actual bio-oil was invest

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20

Carmichael, J. "Hydrogenation of deactivated carbonyls over platinum group metal catalysts." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.426964.

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21

Heaton, Stephen Nicholas. "Vinylsilane and silyl hydride complexes of platinum group metals." Thesis, University of York, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295650.

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22

Totland, Marina. "Determination of the platinum group metals in geological materials." Thesis, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390298.

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23

Wells, Peter Philip. "Controlled surface modification of supported platinum group metal catalysts." Thesis, University of Southampton, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438652.

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24

Savage, Paul David. "Organometallic compounds of rhenium and the platinum group metals." Thesis, Imperial College London, 1987. http://hdl.handle.net/10044/1/46494.

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25

Stanger, Gillian. "Preparation and characterisation of the platinum group metal fluorides." Thesis, University of Leicester, 1988. http://hdl.handle.net/2381/33924.

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An extensive reveiw of the platinum group metal fluorides has been carried out and in the light of this, new preparative routes have been developed and characterisation has been significantly improved. The preparation of the platinum group metal fluorides in both static and dynamic systems is discussed in chapter two. The fluorinations of ruthenium, rhodium and platinum sponges in dynamic systems proved to be of greatest interest. In these studies large amounts of ruthenium hexafluoride and platinum hexafluoride were produced and traces of rhodium hexafluoride were noted, where as previously m

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26

Johnson, T. "Platinum group metal modifications of TiO₂ for environmental remediation." Thesis, University of Liverpool, 2017. http://livrepository.liverpool.ac.uk/3006082/.

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27

Totland, Marina. "Determination of the platinum group elements in geological materials." Thesis, Kingston University, 1993. http://eprints.kingston.ac.uk/20571/.

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The available instrumental methods for platinum group element (PGE: Ru, Rh, Pd, Os, Ir, Pt) and gold (Au) determinations are reviewed. Inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and ICP-mass spectrometry (ICP-MS) enable rapid, multi-elemental analysis, their instrumental and analytical characteristics being discussed here. The suitability of ICP techniques to quantitatively determine the PGEs + Au is demonstrated. The detection limits by ICP-AES range from 6 to 29 ng.mL[sup]-1, while those for ICP-MS range from 0.3 to 0.22 ng.mL[sup]-1, for the individual PGEs + Au. A di

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28

Carroll, Sandy. "The viability of the Kaplats Platinum group element deposit." Access, 2006. http://upetd.up.ac.za/thesis/available/etd-07102008-080330/.

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29

Lord, Richard Alastair. "Platinum-group element mineralisation in the Shetland ophiolite complex." Thesis, Open University, 1991. http://oro.open.ac.uk/57329/.

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The Shetland ophiolite complex exhibits the lower part of the definitive Penrose sequence, but chromitites from the Cliff locality contain levels of Pt and Pd which are unusual in ophiolites. Aspects of this mineralisation suggest both magmatic and hydrothermal concentration processes, although neither individually explain the observed paragenesis. This study examines the distribution of PGE within a representative fresh vertical section of the ophiolite stratigraphy, to assess the relative roles of such processes in the concentration and fractionation of PGE. In the field area around Balta So

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30

Du, Toit Zita. "Simulation of a palladium extraction circuit." Thesis, Stellenbosch : University of Stellenbosch, 2006. http://hdl.handle.net/10019/536.

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31

Wicks, Joseph Leslie Michael. "Routes to mixed metal compounds of the platinum group : metal σ-acetylide complexes and platinum clusters". Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620495.

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32

Arnold, Philip M. "Coordination chemistry of platinum group metals with sulphur-containing ligands." Thesis, University of Oxford, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.249298.

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33

Jeffery, Edward. "Hydrogenation of ketones over platinum group metals : a DFT study." Thesis, Cardiff University, 2007. http://orca.cf.ac.uk/54642/.

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The enantioselective hydrogenation of a-ketoesters over a platinum surface modified by cinchona alkaloids has been studied using accurate computational modelling. A series of small prototype compounds were used to interact with the metal surface, leading to the study of acetone adsorption on a platinum surface. It was found that the enol and enolate isomers of acetone may play a crucial role in the surface chemistry. The enol form of acetone was significantly more stable than the keto-form, and the enolate form was also more stable. Vibrational frequency analysis suggests that the enolate form

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34

Martinez, Josep Vicent Colomer i. "Towards separation of platinum group metal anions from feed solutions." Thesis, University of Southampton, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496074.

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35

Lenthall, Joseph T. "Anion and platinum group metal binding of bis(thioureido) ligands." Thesis, Durham University, 2007. http://etheses.dur.ac.uk/2854/.

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A series of bis(thioureido) ligands have been synthesised, which show anion binding in acetone-d(_6). Their structures have been determined by X-ray crystallography and some exhibit hydrogen bonding interactions with the π-electrons of the the thiocarbonyl bond. This hydrogen bonding interaction has been investigated for the general thiocarbonyl and carbonyl bond using the CSD, and a marked difference in the interaction of hydrogen bond donors with the π-electrons of carbonyl and thiocarbonyl bonds has been shown. The bis(thioureido) ligands have been coordinated to platinum group metals and t

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36

Wenger, J. C. "Surface chemistry of the group IIB metal dimethyls on platinum." Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334697.

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37

Freestone, Timothy. "Some aspects of the biocompatibility of the platinum group metals." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316572.

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38

McKenzie, S. G. "The effect of platinum group metals on duplex stainless steel." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37782.

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39

Morton-Fernández, Brian. "Synthesis and characterisation of dithiolato complexes with platinum group metals." Thesis, University of St Andrews, 2013. http://hdl.handle.net/10023/3556.

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The interest in biosensors can be attributed to the first described enzyme containing sensor used to detect levels of glucose in 1962. Although research into biosensors was initially slow to pick up, the field has become increasingly popular and research has been widespread for the last 20 years. The continuing research into biosensors is crucial as this will improve current devices to become smaller, faster and more economical and yield new biosensors. This thesis is mostly concerned with the development of an integral component of a biosensor, the redox mediator. Complexes of ruthenium incor

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40

Wilson, Andrew Matthew. "Ditopic reagents for the solvent extraction of platinum group metals." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/16864.

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This work aims to develop solvent extractants to recover platinum and palladium from highly acidic chloride solutions bearing other platinum group metals (PGMs). In general, metal values can be recovered by solvent extraction through three different mechanisms: metal cation extraction (1); metalate anion extraction (2); or metal salt extraction (3). Mn- + n(LH)(org) ⇌ [M(L)n](org) + nH+ (1) MClx n- + nL(org) + nH+ ⇌ [MClx(LH)n](org) (2) MClx + nL(org) ⇌ [MClxLn](org) (3) The main objective of this thesis is to establish whether ditopic extractants can be developed which have chemical functiona

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41

Lopes, Lidia Velazquez. "Sorption of the platinum-group elements in selected solid matrices." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/4210.

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Summary in English.<br>Bibliography: leaves 70-75.<br>Recent research on the platinum-group elements (PGE) has shown increased concentrations in environmental samples, probably as a result of the widespread use of PGE (Pt, Pd and Rh in particular) as catalysts in the chemical and car industry. Most of the recent research on PGE focuses on the analysis of concentrations in environmental samples exposed to anthropogenic sources of PGE, but there are very few studies that have investigated sorption behaviour of PGE in soils.

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42

Sperring, Sophie. "Alteration of gold nuggets enriched with Platinum Group Elements (PGEs)." Thesis, Sperring, Sophie (2017) Alteration of gold nuggets enriched with Platinum Group Elements (PGEs). Honours thesis, Murdoch University, 2017. https://researchrepository.murdoch.edu.au/id/eprint/41061/.

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Understanding the mechanisms of incorporation, the form, and the solid-state solubility of Platinum Group Elements (PGEs) in gold nuggets at the nanoscale is critical to future works in gold (Au) nanoscale crystallography. Current works looking at similar samples include Mineral company research into extraction methods of similar samples and research in progress at the University of Western Austral using the alloy of the Au samples for medical purposes. The work completed by this this used Au nugget samples that were taken from Ruby Creek, British Columbia, Canada. The geology specific to

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43

Penberthy, Catharina Johanna. "The effect of mineralogical variation in the UG2 chromitite on recovery of platinum-group elements." Pretoria : [s.n.], 2005. http://upetd.up.ac.za/thesis/available/etd-11282005-113358/.

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44

Gash, Rosslyn Clare. "Metal haloalkyl in complexes in catalysis." Thesis, University of St Andrews, 1993. http://hdl.handle.net/10023/14706.

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In this thesis, the preparation of a number of halomethyl complexes of rhodium, platinum, and palladium is described. Complexes of the type trans-[Rh(CH2X)X(P4)]+ (X = Cl, Br, I, P = PMe3, dmpe) were found to be unstable, decomposing in situ to give a mixtures of dihalo, trihalo, and phosphine ylide species. Platinum and palladium species of the type trans-M(CH2X)X(PEt3)2 (X = Cl, I, M = Pt, Pd), which were formed by the reaction between M(PEt3)3 CH2XY were also unstable. In the case of platinum, phosphine ylide species were isolated from reaction mixtures, whilst the palladium halomethyl spec

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45

Machado, Norma Maria Pereira. "Rheological study of nuclear glass melts containing Platinum Group Metal aggregates." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0018.

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En France, les produits de fission nucléaire issus du retraitement des combustibles usés sont conditionnés au sein de matrices de verres borosilicatés. Lors du processus de vitrification à haute température (1200 °C), les éléments à confiner réagissent chimiquement avec les additifs de vitrification pour former un verre homogène. Cependant, parmi ces éléments, les platinoïdes ne sont pas solubles dans le bain de verre et restent en suspension sous forme de particules de quelques microns. Ces particules présentent une forte tendance à l'agrégation et les suspensions peuvent alors présenter une

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46

Alshana, Usama Ahmed. "Separation And Quantitation Of Some Platinum Group Metals By Rp-hplc." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605760/index.pdf.

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In this study, a reversed-phase high performance liquid chromatography (RP-HPLC) method has been developed to separate and determine Pt and Pd after formation of their chelates with N,N-diethyl-N&#039<br>-benzoylthiourea (DEBT). With the aim of reducing the number of steps in treating the samples, the method developed does not require the elimination of excess chelating reagent before the analysis of metal chelates. The different physical and chemical parameters affecting separation were examined in details. The whole analysis was completed on a C18 column in 16 min at 280 nm, with the mobile

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47

Shi, Peipei. "Geochemical assessment of the bioavailability of platinum group metals for phytomining." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57880.

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Phytomining is suggested as a novel technology to obtain platinum group metals (PGMs) nanoparticles from plants grown on the mineralized soil, rock, or on mine wastes. The primary determinant of metal uptake by a plant is the bioavailability of the metal in the soil-plant system. In this thesis project, the bioavailability of PGMs of several PGM-rich materials is assessed with respect to phytomining. Notably, feed, concentrate and tailings from North American Palladium (NAP) in Canada, and two gossan samples from Broken Hill (BH) mineral complex in Australia are assessed in the context of phyt

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48

McAslan, Ewan Blyth. "Synthetic, structural and spectroscopic studies on some platinum group metal complexes." Thesis, University of Edinburgh, 1986. http://hdl.handle.net/1842/28560.

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49

Shams, Leyla. "Accumulation of platinum group elements by the marine microalga, Chlorella stigmatophora." Thesis, University of Plymouth, 2010. http://hdl.handle.net/10026.1/309.

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Very little information exists on the marine biogeochemistry of Rh, Pd and Pt, or the platinum group elements (PGE), an emerging group of contaminants whose principal emissions are associated with the abrasion of the catalytic converter in motor vehicles and chemotherapy drugs discharged in hospital wastes. In this study, Rh(III), Pd(II) and Pt(IV) were added individually and in combination to cultures of the marine microalga, Chlorella stigmatophora, maintained in coastal seawater at 15oC and under fluorescence lighting both in the presence and absence of trace nutrients (e.g. Fe, Co, Zn and

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50

Wright, Edward Anthony. "A study of the hydrogen evolution reaction on platinum group metals." Thesis, University of Exeter, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.414258.

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