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Showing 1 to 20 of 99 for “"heterogeneous catalysts"”.
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Tailored heterogeneous catalysts for biomass conversion
… focuses on the development and optimization of heterogeneous catalysts designed to address pressing challenges in sustainable biomass conversion. The introductory chapter outlines the importance of catalysis in advancing sustainable technologies, highlighting the need for catalysts that balance …
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Structural and mechanistic identification of heterogeneous catalysts
… energy industries, understanding and improving heterogeneous catalysts is essential to advance their development and enable more sustainable processes. Atomically disperse or single atom catalysts have shown particular promise for their ability to exceed nanoparticle catalysts with regards to …
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Design of Robust Heterogeneous Catalysts for Sustainable Chemistry
Robust heterogeneous catalysts based on polymer derived non-oxide ceramics (SiC/SiCN) with integrated late transition metal (Ni, Pd) nanoparticles (NPs) were designed, characterized and tested for their catalytic potential. For the decoration of SiCN support with metal NPs, a molecular approach was …
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Zeolite encapsulated metal complexes as heterogeneous catalysts for oxidation reactions
… in the nanocage of zoilite-Y generates new heterogeneous catalysts. These catalysts were synthesized employing the flexible ligand method encapsulation technique.The structures of these encapsulated complexes were established on the basis of various physico-chemical and spectroscopic …
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CHARACTERIZATION OF HETEROGENEOUS CATALYSTS USING ADVANCED TRANSMISSION ELECTRON MICROSCOPY TECHNIQUES
… University, December 2016. Characterization of Heterogeneous Catalysts using Advanced Transmission Electron Microscopy Techniques. Major Professor: Volkan Ortalan.
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SELECTIVE OXIDATION OF CYCLOHEXANE TO K-A OIL USING HETEROGENEOUS CATALYSTS
… was aimed at the development of innovative heterogeneous catalysts for the selective oxidation of cyclohexane to KA oil. Among the materials employed, supported and unsupported catalytic systems containing Fe, Co, Au, Cu, Ce and/or Zr were prepared and tested. The prepared materials were …
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SYNTHESIS, CHARACTERIZATION, AND KINETIC EVALUATION OF PLANAR AND SUPPORTED HETEROGENEOUS CATALYSTS
… 1-preparation and characterization of model catalysts containing metal oxide overcoats and metal nanoparticles synthesized by atomic layer deposition (ALD), a gas-phase material deposition technique, 2-the study of structure sensitivity for formic acid decomposition on planar Pt catalysts, …
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Hydrothermally stable heterogeneous catalysts for biorenewable-derived molecule conversions to chemicals
… important to this idea is the development of catalysts capable of handling the conditions inherent to biorenewable feedstocks. Water presents a significant challenge to today's catalysis. Using biorenewables, especially sugars, forces the processing to be in the condensed phase as they have …
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Friedel-crafts acylation reactions using heterogeneous catalysts stimulated by microwave radiation
… acid were prepared. Characterisation of the catalysts using pyridine adsorption revealed the catalysts contained both Brønsted and Lewis acid sites. When the catalytic activities for the acylation of toluene and anisole were studied there was found to be a correlation between the Brønsted …
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Selective oxidation of cyclohexane to k-a oil using heterogeneous catalysts
… was aimed at the development of innovative heterogeneous catalysts for the selective oxidation of cyclohexane to KA oil. Among the materials employed, supported and unsupported catalytic systems containing Fe, Co, Au, Cu, Ce and/or Zr were prepared and tested. The prepared materials were …
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Characterization of acidic and basic properties of heterogeneous catalysts by test reactions
Classification of catalysts according to their active sites can be done by catalytic test reactions. In contrast to acid catalysed test reactions which are actually well understood there is a need to study base catalysed reactions in detail. Therefore reactions in gas phase like conversion of …
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Multiscale computational simulation of multidimensional chemically reacting flow over washcoated heterogeneous catalysts
… tabulation for the acceleration of transient, heterogeneous chemistry in large CFD models; and the development of catalytic washcoat performance relations informed by 3D reconstructions of actual, commercial washcoats. Ceramic microchannel heat exchangers/reactors have several distinct …
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Interactions of biomass derived oxygenates with heterogeneous catalysts in aqueous and vacuum environments
… schemes. Metal oxide and metal oxide supported catalysts are heavily used in oil refining and petrochemical production, and are capable of upgrading biomass molecules as well. However, the surface chemistries that dictate the behavior of aqueous phase biomass upgrading reactions over metal oxide …
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Development of Heterogeneous Catalysts for Upgrading Biomass Pyrolysis Bio-Oils into Advanced Biofuels
… upgrading techniques for biofuel production. Heterogeneous catalysts are essential for upgrading bio-oil into hydrocarbon biofuel. Although some progresses have been made, the cost and effectiveness of catalysts still remain challenges. The main objective of this study was to develop efficient …
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Novel routes for synthesis of Pd nanoparticles and faceted ZnO supports for heterogeneous catalysts
… deactivates quickly and is pyrophoric. Pd catalysts are much more stable, but reactions using these catalyst follow the decomposition pathway, CH3OH --> 2H2+CO. PdZn alloys can achieve the desired selectivity, and have been noted to form under reaction conditions from Pd/ZnO heterogeneous …
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FIRST-PRINCIPLES DENSITY FUNCTIONAL THEORY STUDIES OF REACTIVITIES OF HETEROGENEOUS CATALYSTS DETERMINED BY STRUCTURE AND SUBSTRATE
<p>In this dissertation, density functional theory (DFT) calculations were used to investigate (1)NO<sub>2</sub> adsorption on BaO in NO<sub>x</sub> Storage Reduction (NSR) catalyst affected by the morphology of BaO and the γ-Al<sub>2</sub>O<sub>3</sub> support, (2) energy barrier of H<sub>2</sub> …
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The selective oligomerization of ethylene with metal-organic frameworks
The benefits of heterogeneous catalysis for industry and the society at large cannot be overstated, with approximately 90% of all industrial catalysis being performed with heterogeneous catalysts. Despite the undeniable operational advantages of heterogeneous catalysts, several large volume …
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Graphite-conjugated catalysts : bridging heterogeneous and homogeneous catalysts
… which can be carried out by either metallic heterogeneous or molecular homogeneous electrocatalysts. Metallic heterogeneous catalysts have a continuum of electronic states that distribute the redox burden of multielectron reactions, allowing for efficient catalysis. However, heterogeneous …
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SURFACE SCIENCE APPROACH TO ATOMIC LAYER DEPOSITION CHEMISTRY
… high conformality on complex geometries such as heterogeneous catalysts and microelectronic devices. In this work, surface sensitive characterization techniques have been employed to investigate initial precursor-substrate reactions and ALD surface chemistry.
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