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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 46 for “"homogeneous catalysis"”.
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Mechanism and kinetics of homogeneous catalysis
<p>A model-based approach using a diverse set of data including monomer consumption, evolution of molecular weight, and end-group analysis was employed to determine each of the reaction specific rate constants involved in 1-hexene polymerization process catalyzed by a family of group IV single-site …
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Ligand design in nickel and cobalt complexes for homogeneous catalysis
… second- and third-row transition metals in catalysis has pushed scientists to develop more earth-abundant first-row transition metal catalysts which can match or surpass the activity and selectivity of their less earth-abundant counterparts. Moving towards these first-row transition metals …
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Developments of time-resolved XAFS spectroscopy techniques - applications in homogeneous catalysis
Catalysis is one of the most important methods to obtain products in a selective and sustainable manner, i.e. in an environmental responsible manner. To be able to modify and optimize these catalytic production pathways, it is important to obtain knowledge on the reaction mechanisms occurring. …
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Homogeneous Catalysis in the Oxidation of P-Chlorophenol in Supercritical Water
… of the kinetics of the uncatalyzed and homogeneously catalyzed oxidation of p-chlorophenol in water near the critical point. The temperatures and pressures studied range from 310$\sp\circ$C to 400$\sp\circ$C and 75 to 240 atm, respectively. The rate expression for the disappearance of …
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Optimizing selectivity and activity in heterogeneous and homogeneous catalysis for chemical production
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-05-01
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PALLADIUM-BASED SYSTEMS IN HOMOGENEOUS CATALYSIS: EXPLORING NITROGEN LIGANDS FOR CO-MEDIATED REACTIONS
This work explores palladium‐based systems in homogeneous catalysis, focusing on CO‐mediated transformations and the role of nitrogen ligands. Building on the efficiency of palladium-phenanthroline catalytic system in reductive cyclization of nitroarenes, the study investigates CO and its …
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Coordination chemistry of unusual oxidation states of nickel and palladium relevant to homogeneous catalysis
… positions in the realm of metal-mediated catalysis. Transition metal complexes containing these metals are some of the most active catalysts that have been developed for important areas including, but not limited to, cross-coupling catalysis, C-H activation, olefin polymerization, and …
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The synthesis and properties of selected transition metal-pyrazole complexes and their application towards homogeneous catalysis
… may find useful application in the field of homogeneous catalysis. Metal-containing, chelating ligands can theoretically be. generated by deprotonation of transition metal complexes containing n -pyrazole ligands. Reaction of such species with other metal complexes containing labile groups, …
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Homogeneous Catalysis in Flow-by Porous Electrodes Containing Gas-Liquid Flow (Mass Transfer, Redox Catalyst, Oxygen Electrode)
Transport and reaction in a porous electrode containing gas-liquid flow and a dissolved catalyst were studied. Dimensionless criteria were developed for the selection and evaluation of candidate catalysts.
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An investigation into the alkene hydroformylation reaction using platinum complexes
Hydroformylation is the most widely applied homogeneous catalysis reaction used in industry. The aldehyde product is an important commodity in both the bulk and specialty chemical industry. Platinum catalysts have shown significant chemo- and regioselectivities in alkene hydroformylation. This …
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Synthesis and Application of Air-Stable Secondary Phosphine Oxide, Oxime, and Amine-Phosphine Palladium(II) Complexes in Transfer Hydrogenation and Cross-Coupling Reactions
Catalysis plays an important role in industry as over 90% of chemical processes involve catalysts in at least one step. Historically, heterogeneous catalysis has been more commonly employed in industry as these systems tend to be more economically friendly and environmentally benign. However, …
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TOWARDS SUSTAINABLE CATALYSIS: DESIGN OF EARTH-ABUNDANT METAL COMPLEXES FOR WASTE VALORIZATION
… of PhD regarding sustainable metodologies in homogeneous catalysis. First chapter: selective oxidation of alcohols using iron(III) pyclen ligand complexes as catalyst and hydrogen peroxide as oxidant. Application and mechanistic insights. Structural and spectroscopical investigation of …
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Supramolecular Nanostructures as Support Materials for Gold Nanoparticle Catalysts
… current research focuses on heterogenous gold catalysis, with metal oxides being the most commonly employed support material for AuNPs. However, metal oxides are challenging to evenly distribute in solution and intrinsically difficult to modify. Molecular self-assembly provides a novel route to …
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REMEDIATION OF TEXTILE AND MINING INFLUENCED EFFLUENTS USING NOVEL HETEROGENEOUS PAN CATALYST AND MODIFIED PAN MESH
… has no significant contribution, by means of homogeneous catalysis, in the removal of dye. The system was successful in treating a real dye-bath effluent that was much more concentrated than usual textile effluents. The continuous flow treatment in a prototype of a rotating discs contactor …
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APPLY LADDER OF CHEMICAL CIRCULARITY: RECYCLING OF RARE EARTH ELEMENTS RECOVERED FROM ELETRONIC WASTE AS A CATALYST IN ORGANIC REACTION.
… acids and copper catalysts in asymmetric and homogeneous catalysis, with a specific focus on continuous flow chemistry. The research extensively examines the Michael addition reaction between indoles and benzylidene malonates, employing these catalysts to achieve high reaction efficiency and …
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Rearrangements of Radical Anions Generated from Cyclopropyl Ketones
… → homoallyl rearrangement. Rates of homogeneous electron transfer from a series of hydrocarbon mediators to substrates were measured using homogeneous catalysis techniques. Standard reduction potentials and reorganization energies of substrates were derived using Marcus theory. …
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Sulfate and Hydroxide Supported on Zirconium Oxide Catalysts for Biodiesel Production
Biodiesel is currently produced by homogeneous catalysis. More recently however, heterogeneous catalysis is being considered as a cheaper alternative to the homogeneous process. In this research project, heterogeneous catalysts of zirconium oxide were produced by impregnation. Zirconium oxide …
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Development of O,N-bidentate ruthenium catalysts for isomerization and kinetic studies of ruthenium carbenes for C=C coupling reactions
… organometallic compounds have paved the way of homogeneous catalysis in producing bulk, fine chemicals, and even natural products. During the last decade, ruthenium catalysts have provided new indispensable synthetic methods that cannot be promoted by other catalysts and applied in wide range of …
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