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Showing 1 to 20 of 30 for “"Catalyst supports."”.
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Monolith Catalyst Supports for Hydrogen Production
… ruthenium supported on gamma-alumina (Ru/ -AbOo) catalyst.. However, it has been observed that. upon increasing the sea.le, pressure-drop and mass transfer limitations become significant issues. It is, therefore, desired to shift from packed bed reactors to monolithic reactors to overcome these …
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Coating of catalyst supports: links between slurry characteristics, coating process and final coating quality
… across the world has caused the use of monolith catalysts in automotive emission control to become ubiquitous. Control of the adherence and homogeneity of the platinum group metal (PGM) coating onto the monolith block, to maximise catalytic performance for a minimum PGM loading, is therefore …
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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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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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Design and Fabrication of Microreactors for High Temperature Applications
… characterization of SiC and SiCN inverted beaded catalyst supports, which have high chemical and thermal stability (are stable to 1200°C in air), are highly porous (have a void fraction of 0.74) to reduce the pressure drop across the reactor, and have a high surface area-to-volume ratio. …
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Carbon Coating for Improved Hydrothermal Stability of Silica Supports
… Since the new feedstock is in aqueous phase the catalyst supports used currently in the petroleum-based chemical industry, such as silica and alumina, will not work because they are not hydrothermally stable. Silica and alumina are used as catalyst supports because they are mechanically stable, …
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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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SYNTHESIS AND CHARACTERIZATION OF NEW ELECTROCATALYTIC MATERIALS TO IMPROVE THE PERFORMANCE, OPERABILITY AND LIFE-TIME OF PEMFCS
… of catalytic activity and durability of catalysts represents one of the most important issues in fuel cell technology. To increase the performace and decrease the load of the catalysts, materials with high surface area and pore volume, commonly carbons, are widely used as catalyst …
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Vapour-Liquid Equilibria within Nanoporous Media
… their mixtures, confined in titania and silica catalyst supports. These investigations are conducted at industrially-relevant, high-temperature (≥ 180 °C) and high-pressure conditions (up to 13 bar), made possible by a pilot-scale chemical reactor unit, designed to operate inside the strong …
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Design And Evaluation Of Novel Open-Pore Titanium Foams
… including hydrogen storage, electrodes, catalysts, catalyst supports, structural sandwich cores, and orthopedic and dental implants. In the present study, novel open-pore titanium foams have been developed using camphene to freeze-cast titanium powders, followed by camphene sublimation …
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Investigation of the potential catalytic activities of several metal organic framework (MOF) materials
… Ni(FA) and Zn(FA). These MOFs are used as catalyst supports for iron or platinum nanoparticles. The catalysts are prepared using incipient wetness impregnation method and characterized with Brunauer-Emmett-Teller (BET), pulse chemisorption, X-ray diffraction (XRD), temperature-programmed …
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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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Linear and non-linear mechanistic modeling and simulation of the formation of carbon adsorbents
… from air; often, carbon adsorbents also serve as catalysts or catalyst supports. The formation of carbon adsorbents entails the modification of the original internal surfaces of carbonaceous substrates by resorting to a variety of chemical or physical methods, thereby augmenting the carbonaceous …
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Terahertz Methods for Investigating the Liquid Transport Characteristics in Porous Media
… tablets as well as the impregnation of catalyst supports and heterogenous catalysis. In this thesis, the terahertz methods, i.e. terahertz time-domain spectroscopy (THz-TDS) and terahertz pulsed imaging (TPI), were used as promising techniques to quantify the impact of the microstructure …
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Polymers from the natural product betulin : a microstructural investigation
… in industry, such as the use as sorbents, catalyst supports and membranes for separation processes. Recently, much attention has been focused on synthesizing porous polymer materials. A vast amount of tailor-made polymeric systems with tunable properties has been investigated. Very often, …
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Dynamics of liquids in porous media: Investigating competitive adsorption using NMR relaxometry
… The work was done on three different mesoporous catalysts and catalyst supports, namely anatase titania, γ-alumina and silica. The main NMR relaxometry method that was applied was Fast Field Cycling (FFC) NMR, which has been shown to quantitatively probe surface-adsorbate interactions of liquids …
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Characterising Adsorption and Mass Transfer in Porous Media
… particular silicas and aluminas commonly used as catalyst supports. The techniques used are demonstrated to be capable of acquiring information relevant to the performance of heterogeneous catalysts and adsorbents across the hierarchy of length scales relevant to industrial processes. The …
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The sintering and stability of catalytic nano-particles
Studies were performed on three different catalysts in order to determine their stability and sintering behavior. Pd deposited on a flat single crystal substrate made of Al2O3 was characterized to determine if the mechanism of Ostwald ripening was solely dominated by vapor phase transport of metal …
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Aerosol Synthesis and Electrochemical Analysis of Niobium Mixed-Metal Oxides for the Ethanol Oxidation Reaction in Acid and Alkaline Electrolyte
… must be achieved by the development of advanced catalysts that are electrically conductive, stable in corrosive environments, contain a high surface area on which the reaction can occur, and exhibit a bi-functional effect for the ethanol oxidation reaction (EOR). The latter criterion is …
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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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