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 30 for “"CO₂ reduction"”.
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Osmium complexes as models for CO reduction intermediates
… of osmium as organo-metallic models for CO reduction intermediates. In Chapter 1 some aspects of ligand reactivity of the carbon-donor ligands CO, CS, CSe, CTe and carbenes in transition metal complexes are reviewed. The reduction reactions of these ligands are emphasized. The preparation …
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Structural studies of imidazolium and phosphonium cations with aprotic hetero cyclic anions (AHAs) and investigation of electrochemical CO₂ reduction
Increasing carbon dioxide (CO₂) concentration in the atmosphere has become a crucial problem because it has greatly contributed to global warming. Previously, Aprotic Heterocyclic Anions (AHAs) based Ionic liquids (ILs) have been developed for post combustion CO₂ capture applications. In order to …
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Improving selectivity in electrochemical CO₂-to-fuels catalysis : the role of catalyst mesostructure, surface structure, and electrolyte
Mitigating atmospheric CO₂ levels is an important challenge in curbing anthropogenic climate change. To this end, the storage of intermittently generated renewable energy in the chemical bonds of electro-reduced CO₂ is considered an attractive carbon-neutral route to storing CO₂ . However, the …
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Reactivity, Characterization, Equilibrium Thermodynamics and Hetero-bimetallic Studies of Tridentate and Tetradentate Complexes Relevant to Syngas Catalysis
… with a series of small molecules relevant to CO reduction and hydrogenation. Several complexes were formed that demonstrated the ability to partially reduce and hydrogenate carbon monoxide, including the dirhodium ketone (Rh-C(O)-Rh) and an example of a thermodynamically favorable metal formyl …
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Tailored diketopyrrolopyrrole-based organic dyes in photoelectrochemical cells for solar fuel synthesis
… the current energy crisis and reduce global CO₂ emissions. However, most reports currently focus on precious metal-based light absorbers, thus limiting the wide-scale implementation of this technology. In this dissertation, the use of metal-free diketopyrrolopyrrole (DPP) chromophores has …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
… of the Rh2O3 clusters from RhCl3 after H2 reduction at 400°C. CO reduction showed different behaviour depending on the temperature. Bimetallic Rh-Pd cluster formation occurs within 80 minutes at 400°C during CO reduction. At lower temperatures, no transformation occurred. The metal/support …
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Amine-mediated electrochemical reduction of CO₂ in a nonaqueous, Li-CO₂ battery/
The development of effective CO₂ capture and conversion methods is not only crucial for mitigating rising global atmospheric CO₂ concentrations but also for exploiting atmospheric carbon dioxide as a potential source of C1 feedstock for the industrial synthesis of fuels and chemicals. Herein, we …
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THEORETICAL PREDICTIONS OF POTENTIALS FOR INTERMEDIATE STEPS IN METHANOL AND ETHANOL ELECTROCHEMICAL OXIDATION ON Pt(111)
… tested by comparing reversible potential of CO reduction to formyl on Pt(111) with the one obtained by a more accurate method, the Gibbs energy curve crossing procedure. The results confirm the reliability of LGER in predicting reversible potentials for surface reactions. The Gibbs energy curve …
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Coupled geomechanical reservoir simulation
"Founded by Department Of Energy, the Plains CO₂ Reduction (PCOR) Partnership is investigating the Williston Basin as a candidate for sequestering CO₂ emissions from power plants. The State of Missouri, a member of PCOR, lies at the outermost point on the proposed transportation route and …
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Spectroscopy and Electrochemistry of Nanometre-Scale Plasmonic Gaps
… I investigate the catalysis of a CO₂ reduction catalyst and propose a previously unresolved mechanism. Importantly, the first step in the cycle directly involves the molecular anchoring group which highlights the importance of these groups.
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Morphology Controlled Synthesis of Copper Based Multimetallic Nanostructures and Their Electrocatalytic Properties for Methanol Oxidation Reaction
… of the galvanic replacement reaction and the co-reduction mechanisms, during the alloying process with Cu nanowires. Ru was incorporated into the multimetallic nanotubes forming Cu-Pt-Ru smooth and rough surface structure. The influence of nanotube surface morphology and composition on …
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Ab Initio study of dynamically tunable catalysis for carbon dioxide reduction
Catalytic conversion of CO₂into useful chemicals is an attractive alternative to expensive physical carbon sequestration methods. However, this approach is challenging because current chemical conversion methods employ high temperatures or pressures, thereby increasing cost and potentially leading …
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Overcoming challenges of fundamental electrochemical kinetic studies under dilute-reagent conditions
… concern. We first discuss electrochemical CO2 reduction – a chemistry that is very well studied in the lab environment, but has yet to reach deployment stage. In particular, we address the questions: what happens if we do not have access to a pure CO2 gas feed? Is electrochemical CO2 reduction …
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Dynamics of implementation of mitigating measures to reduce CO₂ emissions from commercial aviation
… the need to implement measures to reduce CO₂ emissions from aviation. Case studies of historical changes in the aviation industry have shown that the implementation of changes generally followed S-curves with relatively long time-constants. This research analyzed the diffusion …
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Traversing catalytic contexts for interrogation and design of carbon conversion electrocatalysts
… useful chemistry to perform electrochemically is CO₂ conversion. Converting CO₂ into value-added chemicals could be one strategy for abating atmospheric carbon, and electrochemistry is well-suited to provide the driving force required for CO₂ conversion reactions that tend to be highly endergonic. …
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Electrochemically-mediated amine regeneration for carbon dioxide separations
… describes a new strategy for carbon dioxide (CO₂) separations based on amine sorbents, which are electrochemically-mediated to facilitate the desorption and regeneration steps of the separation cycle. The absorption of CO₂ is accomplished in a similar manner to standard thermal scrubbing …
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Synthesis, characterization and catalytic investigations of Pt-based binary (bimetallic) and ternary (trimetallic) nanoparticles
… 310 °C), for thermal decomposition or thermal co-reduction. These protocols were successful in producing nanostructures of high quality, with exceptional solubility in polar solvents such as chloroform after repeated washing and drying. Detailed microstructural investigations of the synthesized …
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Carbon dioxide utilization : from fundamental reactivity to catalysis using transition metals supported by macrocyclic diphosphines
Molybdate, a molecular metal oxide, readily binds CO₂ at room temperature to produce a robust monocarbonate complex, [MoO₃(k²-CO₃)]²-. In the presence of excess CO₂, a pseudo-octahedral dioxo dicarbonate complex, [MoO₃(k²-CO₃)₂]²-, is formed. The monocarbonate [MoO₃(k²-CO₃)]²- reacts with …
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The effect of acid soluble copper concentrates on the operations of the flash smelting and slag cleaning furnaces at Nchanga smelter of Konkola copper mines plc
… The consumption of metallurgical coke in the reduction furnaces was also analysed based on the calculations of coke specific consumption per tonne of copper produced. At less than 1% ASCu in concentrate blends, Cu-in-FSF slag was found to have a negligible dependence on ASCu with the values of …
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