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 14 of 14 for “"Catalyst synthesis"”.
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Gas-phase processes for carbon nanotubes production: catalyst synthesis and CNT reorientation dynamics
… hindered by the lack of economic and efficient synthesis methods. The properties of bulk CNT materials are dictated by the individual CNTs, their nanoscale properties (e.g. diameter, length, chirality) and their structural organisation, which are often determined by the synthesis processes. …
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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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SYNTHESIS, CHARACTERIZATION, AND KINETIC EVALUATION OF PLANAR AND SUPPORTED HETEROGENEOUS CATALYSTS
… approach for biomass upgrading to fuels requires catalyst synthesis, characterization, and kinetic evaluation. The work was divided in three areas, 1-preparation and characterization of model catalysts containing metal oxide overcoats and metal nanoparticles synthesized by atomic layer deposition …
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The performance of structured cobalt catalysts in Fischer-Tropsch synthesis
Cobalt is the preferred catalyst metal for the production of clean burning, high cetane number diesel fuel from synthesis gas using the Fischer-Tropsch synthesis. Hence, increasing C5+ selectivity of cobalt catalysts is one of the hot topics in Fischer-Tropsch synthesis. Internal mass transport …
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The Nucleation and Growth of Nanoparticles for Heterogeneous Catalysis
… 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 in …
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Enhanced performance and durability of shape-controlled octahedral PtNiX catalysts for advanced fuel cell applications
… more specifically of platinum group metal (PGM) catalysts, as well as insufficient performance and limited long-term durability. This thesis addresses the development, characterization, and performance evaluation of advanced octahedral Pt-based cathode ORR catalysts of proton exchange membrane …
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Atomic/molecular layer deposition prepared size-selective catalysts and supported nickel catalysts
<p>"Heterogeneous catalysts are widely used because of their many advantages. In this dissertation, the application of atomic/molecular layer deposition (ALD/MLD) in heterogeneous catalyst synthesis and modification was examined.</p> <p>A novel nanostructured size-selective catalyst was synthesized …
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Preparation and characterisation of Pt-Ru/C catalysts for direct methanol fuel cells
… has a high manufacturing cost due to expensive catalyst costs and other materials. Catalyst expenses are further increased by catalyst loading due to low activity at the anode of the DMFC (Zhang, 2008). Hence, with increasing activity and stability of the Pt-Ru/C catalyst, catalyst expenditure …
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Development of functionalized materials through sol-gel route for applications in catalysis and surface protection
… have been produced by sol-gel route. This synthesis way has been used for immobilization on a support of a function focused on green chemistry. The different functions are related with different applications that allow to illustrate the versatility and the flexibility of this sol-gel …
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Nano-structured platinum-based catalysts for the complete oxidation of ethylene glycol and glycerol
… carbon-carbon bonding and poisoning of the catalysts by oxidative byproducts. In order to achieve the highest efficiency, an anode needs to be engineered in such a way as to maximize activity while minimizing poisoning effects of reaction byproducts. We have engineered an anode that uses …
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Solution combustion catalysts for the water-gas shift reaction
… in the catalytic activity via alternative catalyst synthesis techniques. Solution combustion synthesis (SCS) is one such technique that could be used since it allows for the preparation of highly-dispersed Pt oxide particles on low surface area CeO2 with a reproducible metal loading and a …
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Effect of ammonia co-feeding on oxygenates over K-Mo2C in the Fischer-Tropsch synthesis
… such as Fe, Co, Rh and Ni are active for the FT synthesis. Based on reaction conditions employed, commercial Fe and Co based catalysts have been shown to produce between 6 and 12 C% oxygenates. Rh has been shown to have a high oxygenate selectivity, but the associated high raw material cost …
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Application of Molybdenum Carbide Catalysts for the CO2-assisted Oxidative Dehydrogenation of Ethane
… process conditions, competing side reactions and catalyst deactivation via coking are the major challenges. Co-feeding an oxidant significantly decreases the reaction temperature. The oxidative dehydrogenation of ethane to ethylene, using CO2 as the oxidant (CO2-ODH), has earned a lot of interest …
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CO AND CO2 HYDROGENATION BY FISCHER TROPSCH SYNTHESIS PROMOTED WITH IRON BASED HETEROGENEOUS CATALYSIS: DATA COLLECTION AND PROCESS DESIGN
… through processes such as Fischer–Tropsch (FT) synthesis. Traditionally, FT relies on syngas (CO/H2) over transition-metal catalysts, but the direct hydrogenation of CO2 has been less explored, particularly with Fe-based heterogeneous catalysts. Iron is an abundant and inexpensive metal, already …