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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 193 for “"Metal catalysts"”.
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The redispersion of supported metal catalysts
Call number: LD2668 .T4 1978 H347
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The hydrogenation of nitrobenzene over metal catalysts
… reaction was investigated, over a range of metal catalysts, to probe the mechanism of hydrogenation and catalyst deactivation. Initial investigations over Pd/C catalysts revealed the reaction to be sensitive to the solvent and the nature of the carbon support. However more importantly it was …
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Dehydrogenation of anthrahydroquinones over supported metal catalysts
Includes bibliographical references (pages 130-135).
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Oxidation of olive oil by metal catalysts
Thesis: B.S., Massachusetts Institute of Technology, Department of Chemical Engineering, 1921
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X-RAY CHARACTERIZATION OF PLATINUM GROUP METAL CATALYSTS
Platinum group metals (PGMs) are used extensively as catalysts, employed in several sectors of the world energy economy. Fuel cells employing PGM catalysts show promise as power sources in the proposed hydrogen economy, using alcohols as hydrogen storage media. Currently, the most economically …
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Carboxylic Acid Hydrodeoxygenation over Supported Noble Metal Catalysts
… hydrodeoxygenation (HDO) over supported noble metal catalysts was carried out in order identify the main challenges associated with supported monometallic catalysts and identifying solutions that may increase the practicality of these high activity metals. Using propionic acid as a probe …
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Catalytic Hydrodeoxygenation of Guaiacol over Noble Metal Catalysts
… oxygen removal from pyrolysis bio-oils and noble metal catalysts have shown promising activities, especially as compared to the traditional hydrodesulphurization catalysts (e.g. CoMo/Al2O3 and NiMo/Al2O3). However, further understanding and development of the catalysts through improving …
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Transformation of biomass carbohydrates by transition metal catalysts
… acid has now been produced in high yields with a metal salt. The difference between maximizing production for HMF or levulinic acid from the same catalyst relies on the control of the reaction conditions. By using microwave irradiation, improved collisions and stabilized transition states allow …
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Supported metal catalysts for water-gas shift conversion
… monoxide, which is a poison for the platinum catalysts within fuel cells, into carbon dioxide. If the CO concentration required is extremely low, a methanation or preferential oxidation stage can be used subsequent to the WGS stage. This study focuses on the water-gas shift stage of the fuel …
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Atomic-level Insights Into Atomically Dispersed Metal Catalysts
Atomically dispersed metal catalysts have demonstrated promise in heterogeneous catalysis with both nearly 100% utilization efficiency of precious metals and high intrinsic activity of metal sites. As an emergent type of atomically dispersed metal catalysts, single-atom catalysts (SACs) have been …
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Studies of immobilized homogeneous metal catalysts on silica supports
… The active species in all cases is rhodium metal. The catalysts were characterized by XPS, TEM, DRIFTS, and mercury poisoning experiments.;Rhodium on silica catalyzes the hydrogenation of fluorobenzene to produce predominately fluorocyclohexane in heptane and 1,2-dichloroethane (DCE) …
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NEW TRANSITION METAL CATALYSTS FOR CARBON-CARBON BOND FORMATION
… they enable have been the driving force of organometallic chemistry for the past decades. Since their inception, organometallic complexes have been applied to the formation of carbon-carbon bonds both as reagents and catalysts. Ligands and complexes tailored for a particular reaction have …
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The reductive animation of ethanol using supported metal catalysts
… cobalt, nickel and copper are efficient catalysts for the reductive amination of ethanol using ammonia. High selectivity to ethylamine product was obtained between reaction temperatures of 140 and 200°C, between ammonia to ethanol molar ratios ranging from 1 to 4 and between hydrogen to …
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A Study on Supported Metal Catalysts Prepared from Colloidal Precursors
When metal nanoparticles are supported on the surface of an inert carrier, the resulting materials can become powerful heterogeneous catalysts capable of accelerating a diverse range of chemical reactions. Though there are a wide variety of synthetic routes by which these materials can be prepared, …
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Design and use of novel metal catalysts in organic synthesis
… and synthesis of novel dirhodium carboxylate catalysts, and their precursor ligands, for use as enantioselective catalysts in transformations of α-diazocarbonyl compounds. Chapter One focuses on the literature background over the past thirty years in transition metal-catalysed asymmetric …
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Non-precious metal catalysts prepared by chemical functionalization of carbon surfaces.
… research towards the discovery of non-precious metal catalysts (NPMC) with activity comparable to that of Pt. The Fe-N/C catalyst system is a promising alternative, though the exact structure of the active catalytic site is still debated. Active catalysts are typically formed by high temperature …
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Synthesis and Activation of Nanoscale Dendrimer-Derived Supported Noble Metal Catalysts
… as templates for the preparation of supported metal catalysts. This approach takes advantage of several unique characteristics of these dendrimers such as the ability to complex metal cations in solution and to protect them from aggregation until they are impregnated onto a support. After the …
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Properties of Bimetallic Catalysts Prepared From Alumina Supported Mixed Metal Catalysts
Supported bimetallic catalysts represent an important class of commercial catalysts. Despite intensive study, a great deal remains to be learned about these systems. One difficulty associated with the characterization of supported metal catalysts is the variability of sites. Classically prepared …
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Water-gas shift conversion in microchannel reactors using noble metal catalysts
… conditions and in on/off mode. This requires catalysts that are stable with respect to occasional contact with air and condensation of the steam co-fed with the primary fuel and which do not require any activation or other conditioning prior to restart. Only noble metal based catalysts meet …
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