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 131 for “"Heterogeneous-catalysis"”.
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Tuning Heterogeneous Catalysis Using Interfacial Polarization
… emerging energy conversion technologies employ heterogeneous catalysis at solid-liquid interfaces, ranging from faradaic electrocatalysis and nonfaradaic thermochemical catalysis. Unlike for a gas-solid interface, charge transfer events at a solid-liquid interface can polarize the interface, …
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Studies of transient phenomena in heterogeneous catalysis
… oscillations have, been observed in a variety of heterogeneous catalytic reactions including the oxidation of CO. Theoretical studies of these oscillations have involved the application of stability analysis techniques to simplified mathematical models. This dissertation mainly examines isothermal …
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Mechanistic Modeling of Biodiesel Production via Heterogeneous Catalysis
… been prepared through homogeneous basic catalysis, heterogeneous acid catalysis has been investigated recently due to its ability to convert cheaper but high free fatty acid content oils such as waste vegetable oil while decreasing production cost. In this work, the esterification of free …
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Graphene-Supported Metal Nanoparticles For Applications in Heterogeneous Catalysis
… support for palladium to be used in CO oxidation catalysis. The second category will focus on improving of solid support systems of palladium – magnetite catalyst to increase recyclability. The final stage of this investigation will study the use of these solid supported metal catalysts in …
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The Nucleation and Growth of Nanoparticles for Heterogeneous Catalysis
… with a support affects their reactivity as a heterogeneous catalyst. As capabilities in both synthesis methods and characterization methods advance, the use of nanoparticles and sub-nanometer species are more commonly used. These small particles introduce new factors that can cause differences …
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NMR Relaxometry and Diffusometry Studies for Investigating Heterogeneous Catalysis
The work described in this thesis mainly concerns the development and implementation of nuclear magnetic resonance (NMR) methods to provide quantitative information on chemical conversion within a novel NMR compatible trickle-bed reactor (TBR). Techniques to map the distribution of chemical species …
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Heterogeneous Catalysis for CO2 Valorization: Catalyst Studies and Infrared Spectroscopy
L'abstract è presente nell'allegato / the abstract is in the attachment
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A density functional theory study on the rational design of heterogeneous catalysis
… catalysts plays a vital and challenging role in heterogeneous catalysis. With the development of computational chemistry techniques, it is realistic to design the desired catalysts by quantum chemical calculations. In this thesis, density functional theory (DFT) calculations were used to …
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Automated Synthesis Procedure Generation in Heterogeneous Catalysis via Fine-Tuned Language Models
The exploration of catalytic materials and their synthesis routes traditionally demands extensive iterative experimentation and significant time investment. To overcome these constraints, we have developed an advanced extraction workflow integrating language models and multimodal processing …
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Supporting Well-Defined Platinum Group Metals in Metal-Organic Frameworks for Heterogeneous Catalysis
… ligands onto MOFs. Lastly, Chapter 4 reports the catalysis of MOF-supported Rh phosphines prepared via tetrazine click-grafting for the hydroformylation of vinylsilanes and simple alkenes, with remarkable selectivity for linear aldehydes.
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Generation of metal nanoparticles in spherical polyelectrolyte brushes and their application in heterogeneous catalysis
… metal/polymer nanocomposites has been tested by heterogeneous hydrogenation of carbonyl groups. The synthesis of the cationic spherical polyelectrolyte brushes is achieved by a three-step procedure. Firstly, cationic polystyrene core particles are synthesized by emulsion polymerization by using a …
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Effect of a co-solvent feedstock on the synthesis of biodiesel via heterogeneous catalysis
… to be successful in all areas of study with the heterogeneous catalyst nickel oxide. Microreactors are being used to improve the efficiency of the production of biodiesel. The smaller scale makes it possible to produce biodiesel in seconds compared to what industrial biodiesel production requires …
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Computational heterogeneous catalysis applied to steam methane reforming over nickel and nickel/silver catalysts
… surface is needed. In this thesis, computational heterogeneous catalysis is applied to investigate steam methane reforming over nickel (Ni) and silver-alloyed nickel (Ni/Ag) catalysts. Electronic structure calculations using density functional theory (DFT) are employed to develop thermochemical …
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Transition Metal Heterogeneous Catalysis Towards Applications in Sustainable Energy: Leveraging Rational Design Principles for Activity, Stability, and Stereoselectivity
… to accommodate variability in energy resources. Heterogeneous catalysis is a fundamental driver in the development of direct liquid fuel cells, water electrolyzers, and other sustainable energy storage applications including liquid organic hydrogen carriers (LOHCs). The methanol oxidation …
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CO AND CO2 HYDROGENATION BY FISCHER TROPSCH SYNTHESIS PROMOTED WITH IRON BASED HETEROGENEOUS CATALYSIS: DATA COLLECTION AND PROCESS DESIGN
… been less explored, particularly with Fe-based heterogeneous catalysts. Iron is an abundant and inexpensive metal, already known for its high activity in conventional FT from CO. This research aims to develop novel Fe-based catalysts effective in both CO and CO2 derived FT, while also addressing …
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Development and Application of in Situ/Operando Spectroscopic Techniques for Understanding Active Sites and Surface Intermediate Species in Heterogeneous Catalysis
The development and application of advanced steady-state and dynamic spectroscopic techniques have revolutionized the characterization of complex catalytic systems, enabling detailed insights into catalyst structures, reaction intermediates, and mechanisms. This thesis presents the application of …
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Characterization of Alumina-Supported Molybdenum-Iridium Clusters (x-Ray, Spectroscopy)
… have recently gained attention as precursors in heterogeneous catalysis. They have the potential of controlling surface metal particle size and stoichiometry. This may allow one to more efficiently study the role of components in heterogenous catalysts and perhaps effectively create important …
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