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Showing 1 to 20 of 1050 for “"Platinum"”.
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Nanoporous Platinum
Dealloying is a corrosion process in which one or more elements are selectively removed from an alloy leading to a 3-dimensional porous structure of the more noble element(s). These porous structures have been known to cause stress corrosion cracking in noble metal alloy systems but more recent …
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Synthesis of Platinum and Platinum-Copper Branched Nanoparticles for Electrooxidation of Methanol
<p>Platinum and Pt alloys are among the most important heterogeneous catalysts for many organic reactions and electrochemical reactions associated with the fuel cell technologies. How to reduce Pt usage while maintaining the performance of the catalysts becomes a subject for intensive research in …
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Discovering novel platinum structures
The Pt[8]Zr ordering transformation in Pt 11 at. % Zr alloys has been studied. The study included determination of the formation of the Pt[8]Zr phase and its order/disorder transformation temperature (Tc). Electron diffraction patterns and dark field images were obtained from transmission electron …
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Platinum and titanium metallocycles.
Thesis. 1975. Ph.D.--Massachusetts Institute of Technology. Dept. of Chemistry.
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Oxygen reduction reaction on carbon supported dispersed platinum nanoparticles and extended platinum surfaces
To date, the cost of high platinum loadings in polymer electrolyte fuel cells (PEFCs) remains one of the main deterrents preventing their broad commercialisation. The reaction of interest in this work is the oxygen reduction reaction (ORR) occurring at the cathode side of the PEFC. The ORR has been …
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An exploration of automotive platinum demand and its impacts on the platinum market
The platinum market is a material market of increasing interest, as platinum demand has grown faster than supply in recent years. As a result, the price of platinum has increased, causing end-user firms to experience material scarcity through the presence of these high prices. A significant driver …
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Electrochemical studies of carbon monoxide oxidation on platinum and platinum based fuel cell catalysts
… 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 adsorbed CO. Cyclic …
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Templated growth of platinum nanostructures
Novel platinum nanostructures were synthesized by templating the growth of platinum on treated polymer surfaces and within disk-like aqueous bicellar assemblies. The growth mechanisms of all structures were examined in detail. Platinum hollow nanospheres with uniform shell thickness were prepared …
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Cyclometalated Platinum β-Diketiminate Complexes
A series of cyclometalated platinum complexes with ancillary β-diketiminate (NacNac) ligands, prepared by a general synthetic route are described. Two different cyclometalating (C^N) ligands―2-phenylpyridine (ppy) and 2-(2,4-difluorophenyl)pyridine (F2ppy)―are used in concert with two different …
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Order hardening of platinum alloys
The hardening behaviour of three cold-worked platinum alloys, Pt 5 at% Mo, Pt 5 wt% Ru and Pt 5 wt% Cu, has been investigated through a systematic series of heat treatments. All three of the experimental alloys showed a hardness increase during annealing within a specific temperature range. The …
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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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Nickel, palladium and platinum dithiocarbamato complexes
Contains fulltext : mmubn000001_251953947.pdf (Publisher’s version ) (Open Access)
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Interactions of platinum compounds with heterocyclic bases.
It is generally accepted that platinum antitumoar drugs bind, preferentially, to Guanine N7 in DNA. Thus the kinetics of formation and the energetics of dissociation of platinum-nitrogen bonding have been investigated, using simple model bases, namely pyridine. pyrimidine. purine and some …
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Asymmetric hydrogenation catalysed by platinum and iridium
… hydrogenation of α-ketoesters over supported platinum metal catalysts which have been modified by chiral molecules has been studied. The aim of this thesis was (a) to gain a greater understanding of the kinetics of asymmetric hydrogenation of methyl pyruvate (MeCOCOOMe) to methyl lactate …
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Palladium and platinum complexes of vitamin Bâ
Palladium and platinum complexes of pyridoxamine, pyridoxine and pyridoxal have been prepared. The structures of the complexes PtCI2PM.H20, trans-PdC12 (PN)2 and [PLH+ ]2[PtC16] 2- ,H20 have been determined by use of single crystal x-ray studies. The compounds PdC12PH, trans-PdC12 (PN) 2 , …
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Platinum-group elements geochemistry of felsic rocks
The mechanisms by which the platinum group elements (PGE) concentrate and fractionate during magmatic processes, especially in felsic magmatic systems, is poorly understood. The felsic igneous rocks are often linked to hydrothermal Cu-Au mineralization and the presence or absence of sulfide …
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Platinum-group elements geochemistry of felsic rocks
The mechanisms by which the platinum group elements (PGE) concentrate and fractionate during magmatic processes, especially in felsic magmatic systems, is poorly understood. The felsic igneous rocks are often linked to hydrothermal Cu-Au mineralization and the presence or absence of sulfide …
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Dynamics of Carbon-Monoxide Oxidation on Platinum
… 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 Infrared …
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