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 83 for “"noble metals"”.
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Noble metals in the Ronda and Josephine peridotites
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1982.
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Structural and electronic properties of noble metals on metal oxide surfaces
Noble metals on metal oxide surfaces play crucial roles in many catalysis applications. Due to extreme complexity of the interfaces and catalytic reaction processes, basic science studies of model systems are needed to guide the construction and optimization of new industrial catalysts. We have …
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Modeling and Simulation of Optical Properties of Noble Metals Triangular Nanoprisms
… wavelength of the dipole plasmon resonance of metals in the sandwich and its strength.</p>
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Isothermal Annealing Below 60 Degrees K of Deuteron Irradiated Noble Metals
Made available in DSpace on 2015-05-12T17:12:07Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0025244.PDF: 1911512 bytes, checksum: 664303f84518e59c729df287637359a1 (MD5) Previous issue date: 1957
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Surface and interface effects in valence band photoemission of noble metals
… transitions within the valence bands of the noble metals. Experiments studying these direct transitions have yielded fundamental understanding of the electronic structure of noble metals and of the valence band photoemission process. Recently, however, it has become apparent that the standard …
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Biofuels production from hydrotreating of vegetable oil using supported noble metals, and transition metal carbide and nitride
… non-sulfided hydrotreating catalysts, supported noble metal and transition metal carbide/ nitride, and evaluate their hydrocracking activities and selectivities by using soybean oil as the feedstock. For comparison study, catalytic cracking of soybean oil over a commercialized ZSM-5 was …
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Analysis of platinum, palladium and rhodium at trace concentrations in lead using the time resolved spark emission technique called SAFT
The fire assay technique may be used to extract noble metals from platinum bearing ores. It allows for the use of relatively large quantities of ore sample from which trace quantities of noble metals are concentrated. The fire assay with lead as the collector is one such procedure, where …
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CATALYTIC C-O BOND CLEAVAGE TO SELECTIVELY PRODUCE VALUABLE CHEMICALS FROM BIOMASS-DERIVED FURANIC COMPOUNDS USING NI-BASED CATALYSTS
… systems for C-O hydrogenolysis based on non-noble metals due to the high cost and depleting resources of noble metals. In this thesis, we investigated different catalytic systems composing of zeolite-supported Ni catalysts and bimetallic Ni-WOx catalysts, to get more insights into the role of …
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Refractory oxides based multilayered core@shell plasmonic nanostructures
… and in particular the best ones made of noble metals, are soft and have relatively low melting points, which are easily deformed at elevated temperatures. This has become an urgent bottleneck issue holding back the commercialisation of many plasmonic technologies and set significant …
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Plasmonic devices based on transparent conducting oxides for near infrared applications
… constituent materials are limited to the noble metals such as gold (Au) and silver (Ag) due to their abundance of free electrons which enable the support of plasmon resonances in the visible range. With the strong demand for extension of the optical range of plasmonic applications, it is …
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AuPt nano-alloys as reduction promoters for Co/TiO₂ Fischer-Tropsch catalysts
… synthesis are typically promoted with noble metals to achieve a more facile reduction of Co₃O₄ to the catalytically active metal, Co⁰. Hydrogen spillover is thought to be the dominant mechanism for the functioning of noble metals during the reduction process. Platinum is a well-known …
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PEROVSKITE PHOTOCATALYSTS FOR THE DECOMPOSITION OF ODOR MOLECULES
… under UV irradiation, surface modification with noble metals was proposed as a strategy to expand its photoactivity under indoor light sources. Nevertheless, noble metals' high prices and resource shortage limit their applications. In fact, many studies aim to find alternatives based on cheaper …
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Manufacture and Characterization of Ionic Polymer Transducers Employing Non-Precious Metal Electrodes
… materials is very high because of the expensive noble metals that are used as the electrodes in these applications, however. Currently, high cost of these devices has prevented them from experiencing widespread use. The goal of the current research project is to study new methods of plating metal …
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Electrochemical Synthesis and Characterisation of Multimetallic Nanostructured Electrocatalysts
… deposition of nanostructured systems composed of noble metals platinum, ruthenium, and gold. Various electrochemical synthetic pathways were systematically explored producing multilayered nanoscale electrode systems composed of Pt, Ru, or Au on glassy carbon or crystalline gold used as substrates. …
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Influence of preparation techniques on the Fischer-Tropsch performance of supported cobalt catalysts
… gas shift reaction and lower price compared to noble metals [22]. There can, however, be a large effective loss of active metal due to strong metal-support interaction forming complexes that are not reduced at temperatures below 400°C.
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Catalytic Hydrogenation and Hydrodesulfurization of Model Compounds
… Four types of catalysts including supported noble metals, bimetallic noble metals, transition metal phosphides and transition metal sulfides have been investigated for 2-methylthiophene (2MT) hydrogenation and ring opening. The major products were tetrahydro-2-methylthiophene (TH2MT), …
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Nanocomposites for nitrogen oxide emissions control in lean-burn engines
… could be enhanced through the incorporation of noble metals. With the use of 0.1 wt% Pt, the CuO/A1₂O₃ sorbent with 30 wt% Cu could be regenerated twice as quickly. Also, on average only 8 ppm of SO₂ were detected downstream of this sorbent over each adsorption cycle at 400⁰C. The excellent …
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Engineering carbide nanoparticles coated with noble metal monolayers for catalysis
The noble metals (NMs) comprise ruthenium (Ru), rhodium (Rh), palladium (Pd), silver (Ag), osmium (Os), iridium (Ir), platinum (Pt), and gold (Au). Together, these corrosion-resistant elements serve as nature's universal catalysts by binding reactant molecules neither too strongly nor too weakly. …
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Sustainable catalysis using iron based catalysts for hydrofunctionalization of c=x (x = o, n) unsaturated bonds
… are carried out in the presence of noble metals. The price of the noble metals is almost 1000 times higher than that of the nonprecious metals, which has a direct effect on the price of the products synthesized with these catalysts. Therefore, the replacement of these catalysts with …
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