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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 51 for “"Catalyst-support"”.
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Fly Ash Zeolite Catalyst Support for Fischer-Tropsch Synthesis
… aimed at evaluating a fly ash zeolite (FAZ) catalyst support for use in heterogeneous catalytic processes. Gas phase Fischer-Tropsch Synthesis (FTS) over a fixed-bed of the prepared catalyst/FAZ support was identified as an appropriate process for evaluation, by comparison with commercial …
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Evaluation of TiO2 as a Pt-Catalyst Support in a Direct Ethanol Fuel Cell
… of ethanol. Difficulties lie in finding a catalyst that can completely oxidize ethanol and resist poisoning by intermediate reaction species. Degradation of the catalyst layer over time is also an issue that needs to be addressed. In this work, niobium doped-titanium dioxide (Nb-TiO2) is …
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Microreactors for the Production of Hydrogen From Ammonia
… fabrication methods and optimizations of reactor catalyst support were performed. Correlations for the prediction of catalytic activity of possible catalyst metals for use in the reactor were also tested experimentally. Modifications such as adjustments to the geometry of the microreactor …
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Development of Tin Oxide As An Oxidation-Resistant Support For Pem Fuel Cells
<p>The durability of cathode catalysts in proton exchange membrane fuel cells (PEMFCs) is perhaps the most critical issue that hinders the success of PEMFCs application. Specific durability requirements include resistance to corrosion of the catalyst support, stability of the electrochemical …
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MAX phases as an electrocatalyst support material: a DFT study
… produce electricity. However, the currently used catalyst support material, carbon black, corrodes in the low pH and oxidative environment. Therefore, new catalyst support materials are being sought. A new class of material, called MAX phases, shows potential because some possess a combination of …
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Carbon nanotube supported electrocatalysts for polymer electrolyte membrane fuel cells
… research was aimed at a study of novel electrocatalysts for polymer electrolyte membrane (PEM) fuel cells. Carbon nanotubes have been studied as a new catalyst support. A sonochemical treatment method was applied for surface oxidation of multiwalled carbon nanotubes to achieve highly dispersed …
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Preparation and characterisation of inorganic nanostructured support materials for polymer electrolyte fuel cells
… high costs associated with the current carbon supported platinum (Pt/C) catalysts. Carbon support corrosion and Pt dissolution/aggregation on the catalyst layer within the fuel cell have been confirmed as the major contributors to the degradation of the Pt/C (Shao, et al., 2007). Attention …
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Synthesis and characterization of Pt/TiO2/C composite catalysts for fuel cells prepared using a glucose modifier
Catalysts in the electrodes of polymer exchange membrane fuel cells (PEMFCs) serve a critical function in reactions which can be used to generate electrical energy from chemical fuels. Pt nanoparticles are commonly dispersed on a conductive support and used as electrode materials in these devices …
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Conductive Si doped metal oxide fuel cell catalyst supports: understanding the role of Si content
… proton exchange membrane fuel cell (PEMFC) catalysts commonly use platinum supported on carbon (Pt/C) which is susceptible to corrosion, thus a highly conductive and stable Ti3O5 doped by Si (TOS) conductive metal oxide catalyst support is reported. The TOS support was optimized for 20 wt% …
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The Nucleation and Growth of Nanoparticles for Heterogeneous Catalysis
… nanoparticles and how their interaction 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 …
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Synthesis and Catalytic Applications of Ni-Based Single-Atom and Nanoparticle Catalysts Supported on UiO-66-NH2
… CO₂ adsorption capacity. Using it as a catalyst support for CO₂ conversion represents a promising approach. Nickel was employed as the catalytic metal in this study, and two distinct strategies were attempted to introduce it into UiO-66-NH2: ionic and cluster forms. The resulting …
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SiC and B₄C as electrocatalyst support materials for low temperature fuel cells
Supported nano-catalyst technologies are key for increasing the catalyst utilisation and achieving economically feasible platinum metal loadings in hydrogen polymer electrolyte fuel cells (PEFCs). High surface area carbons are commonly utilised as support materials for platinum due to low cost, …
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Synthesis and characterisation of carbon supported gold catalysts prepared by ion-exchange
Gold has been previously overlooked as a catalyst, mainly because the metal has been regarded as catalytically inert, and was tested as large aggregates, and not as nanocrystallites. Large crystallites of gold do not exhibit significant catalytic activity, and if they do, their activity is small …
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Studies of tartaric acid modified nickel supported catalysts for enantioselective hydrogenation reactions
… the catalytic properties of tartaric acid‐nickel supported catalysts, obtained from hydrotalcite‐like compound precursors, in the enantioselective hydrogenation of methyl acetoacetate to methyl 3‐hydroxybutyrate. Variables of reaction during modification such as pH and tartaric acid concentration, …
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ELECTROCATALYSTS AND SUPPORTS FOR POLYMER FUEL CELLS AND ELECTROLYZERS
… and fuel cells, cheaper, more efficient catalysts need to be discovered. In this work, we use high-throughput methods to screen electrocatalysts for CO2 electrolysis and alkaline hydrogen oxidation in hopes of discovering more active, cheaper catalyst than pure platinum group metals. A …
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On the mechanism of carbon nanotube formation by means of catalytic chemical vapour deposition
… graphite. This work examines non-traditional catalyst assisted chemical vapour deposition of CNTs with a view to determine the essential role of the catalyst in nanotube growth. CNT synthesis based upon noble metal and two approaches using germanium nanoparticles are presented. Extensive …
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Materials For Energy: Complex Oxides And Nitrides For New Polymer Electrolyte Membrane Fuel Cell Catalysts And Supports
The currently used carbon-based catalyst supports in polymer electrolyte membrane fuel cells (PEMFC) are not sufficiently stable. New, non-carbon catalyst supports are required for large-scale commercialization of PEMFCS, and must be stable in low pH (1-2) and up to +1.5 V (vs. SHE). The material …
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Fabrication SiO2 -NiO foam via replication technique for steam methane reforming catalyst at low temperatures
… has a wide range of applications, which include catalyst support, filtration, adsorption and separation.The aim of this study is to fabricate Silica-Nickel Oxide (SiO2-NiO) foams in the range 70 μm to 150μm open pore size, 75% to 90% of porosity, good physical and mechanical properties as a …
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