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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 23 for “"Nanocatalysts"”.
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Development of supported nanocatalysts for hydrogen production technologies
In this thesis, the development of nanocatalysts for two different hydrogen production technologies is described. In the first part, a series of supported Ni-Co catalysts were tested for activity in the catalytic partial oxidation of methane to hydrogen/syngas. A 2 wt.% Ni 1 wt.% Co bimetallic …
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Surface Oxidation and Dissolution of Metal Nanocatalysts in Acid Medium
… to study the degradation and dealloying in nanocatalysts. The results on the degradation of Pt nanoparticles under different potential regimes demonstrate that the dissolution depends on the potential path to which the nanocatalyst is exposed. Metal atoms detach from the boundaries of (111) …
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Catalytic Studies Of Noble Metal Nanocatalysts Using Single-Molecule Fluorescence Microscopy
Noble metal nanoparticles are an important class of catalysts. However they are inherently heterogeneous, which makes studying them at the single-particle level desirable, as it then becomes possible to quantify these differences. A highthroughput fluorescence microscopy technique was developed in …
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Mesoporous Carbon/Silica Encapsulated Molybdenum and Ruthenium Nanocatalysts For Green Chemistry Applications
Nanocatalysts have received numerous research interests recently, owing to advancement in material chemistry and nanotechnology. With well-defined size, shape, composition and structure, nanocatalysts have huge potential to be used as active and selective catalysts for a wide range of catalytic …
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Non-noble metal nanocatalysts for the purification and reduction of carbon dioxide
The transition from fossil fuels to more sustainable energy sources is expected to take several decades. A major challenge in the interim is efficient capture, purification, and upgrading of carbon dioxide (CO2). The development of novel heterogeneous catalytic systems is essential to address many …
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Continuous production of supported and shaped metal nanocatalysts using conveyor transport system
… a family of supported and shaped metal nanocatalysts in a single-step process. With carbon monoxide (CO) as a major species to mediate the surface structures of metals, highly uniform cubic Pt/C with narrow size distribution could be synthesized in a continuous fashion; shaped …
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In-Situ Upgrading and Recovery Enhancement of Athabasca Bitumen by Ultra-Dispersed Nanocatalysts
… recovery processes of heavy oil. Ultra-dispersed nanocatalysts can be injected into the reservoir along with hydrogen to enhance both the upgrading and recovery of heavy oil. Nanocatalysts can be introduced into the reservoir at a typical SAGD configuration (in the area between injector and …
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Photocatalytic degradation of pharmaceuticals in water: Design of nanocatalysts and study of by-products and mechanism
Esta tesis doctoral se centra en la degradación fotocatalítica de diferentes medicamentos (paracetamol, ibuprofeno, diclofenaco, naproxeno y ciprofloxacino) en agua. Para este fin diferentes catalizadores fueron sintetizados y caracterizados. La capacidad fotocatalítica del TiO2 y g-C3N4 se …
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Investigation of Ni-Ceria Nanocatalysts: Improved Computational Methods Towards Hydrogen Production in Aquaprocessing of Heavy Oil
… (Ni-CeO2) nanoparticles (NPs) are promising nanocatalysts for water splitting and water gas shift reactions due to the ability of ceria to temporarily donate oxygen to the catalytic reaction and accept oxygen after the reaction is completed. Therefore, elucidating how different properties of …
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Size and composition control of specialty nanocatalysts for sustainability: Fuel cell cathode material and production of sustainable aviation fuel
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2026-12-01
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Relation between surface structural and chemical properties of platinum nanoparticles and their catalytic activity in the decomposition of hydrogen peroxide
… to H₂O and molecular O₂ catalyzed by platinum nanocatalysts is technologically very important in several energy conversion technologies, such as steam propellant thrust applications and hydrogen fuel cells. However, the mechanism of H₂O₂ decomposition on platinum has been unresolved for more …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
Rh,Pd/CeO2 nanocatalysts exhibit excellent activity and stability for ethanol steam reforming (ESR) at 400°C. This thesis encompasses experimental and computational investigations of this nanocatalyst. The activation mechanism of Rh,Pd/CeO2 nanocatalysts under ethanol steam reforming conditions is …
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Atomic-scale and three-dimensional transmission electron microscopy of nanoparticle morphology
… lographic status of novel intermetallic GaPd2 nanocatalysts and advancement of electron tomographic methods for high-fidelity three-dimensional analysis. Going beyond preceding analyses, high-resolution annular dark-field imaging is used to verify successful nano-sizing of the intermetallic …
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Elemental and structural behaviors of bimetallic nanoparticles under reactive environments and its implication in catalyst design, processing, and performance
… the actual structures of the bimetallic nanocatalysts under reaction conditions and how it affects performance, with more emphasis on product selectivity. The two model systems are metal-on-metal Rh-on-Pd for CO2 hydrogenation and Cu@CuAg nanocatalyst for propylene epoxidation. …
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Orbital Level Understanding of Adsorbate-Surface Interactions in Metal Nanocatalysis
… of adsorbate-surface interactions on metal nanocatalysts, paving the path toward adsorbate-specific tuning of catalysis.
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Towards tandem bio-chemo catalytic systems for the activation of alkanes and subsequent oxidation of alcohols to aldehydes using biofabricated Pd and Au catalysts
… of monometallic Palladium (Pd) and Gold (Au) nanocatalysts. Biosorption studies showed rapid adsorption of Pd and Au ions onto all microbial strains within 1- 5 minutes of cell exposure that was best described by the chemisorption of the metals onto amine, hydroxyl or thiol functional groups. …
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Tuning the Morphology and Electronic Properties of Single-Crystal LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4-δ</sub>
… as a tunable support for heterogeneous metal nanocatalysts, where alteration of the support structure and electronics can have an influence on catalytic properties due to unique support effects. Ultimately, this work illustrates the tunable nature of single-crystal LNMO and can inform the …
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Tailored heterogeneous catalysts for biomass conversion
… the stability and catalytic behavior of MgO(111) nanocatalysts when coated with carbon. This modification preserves catalyst activity under reaction conditions and enhances the efficiency of 2-pentanone condensation reactions, a pathway relevant to biofuel synthesis. The carbon coating approach is …
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In Situ Electron Microscopy for Characterization and Development of Clean Energy Nanomaterials
… in three key areas: combustion produced soot, nanocatalysts for soot filtration, and applied carbon nanomaterials for energy storage. Following the publications in these areas, focus was then moved into upgrading the instrument for nanomaterial growth and synthesis. This consisted of funding, …
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Structural characterization of multimetallic nanoparticles
… applications for the thermal activation of Pd-Cu nanocatalysts for EOR reactions.</p>
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