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Showing 1 to 20 of 95 for “"CeO2"”.
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Electrochemical synthesis of CeO2 and CeO2/montmorillonite nanocomposites.
… in-air heating favors the 1:2 stoichiometry of CeO2. Nanocrystalline cerium oxide powders (4 ~ 10 nm) have been produced with anodic electrochemical synthesis. X-ray diffraction and Raman spectroscopy were employed to investigate lattice expansion phenomenon related to the nanoscale cerium oxide …
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Preparation and characterisation of mixed CeO2-Nb2O5-Bi2O3 nanoparticles
… The work presented here investigates the Bi2O3-CeO2-Nb2O5 mixed oxide system and characterises the resulting nanoparticles and crystal structures. Although the parent oxides are well known and much work has previously been done in analysing their crystal structures, combinations of these oxides …
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Electrical properties and defect structure of UO2-CeO2 solid solutions
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1984.
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Oxidação de propeno em catalisadores de CuO suportados em CeO2/y-alumina/cordierita
No presente trabalho, procedeu-se a preparação e caracterização de catalisadores ambientais à base de óxido de cobre suportado em -alumina (suporte)/cordierita (substrato) e que tinham como promotor o óxido de cério. A argila foi conformada via eletroforese na forma de monolitos. Após queima à …
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Atomic Scale Characterisation of Pt-Re/CeO2 for the Water Gas Shift Reaction
… is platinum on a metal oxide support, such as CeO2, however this is prone to deactivation by sintering. It has been shown in literature that the addition of Re enhances the activity and stability of the catalyst, however it requires close contact with the platinum for promotion to take place. …
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Praseodymium doping in Pd/CeO2 systems: material properties and application for the complete methane oxidation reaction
L'abstract è presente nell'allegato / the abstract is in the attachment
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Sistemi di TiO2 e CeO2 e le loro modifiche con ossido di grafene ridotto per applicazioni fotocatalitiche
… chiave sul comportamento fotocatalitico del CeO2, proposto come fotocatalizzatore non comune per la degradazione di pesticidi acquosi persistenti, coinvolgendo anche processi simili a Fenton e Photo Fenton. L'alternanza Ce3+/Ce4+ sulla superficie di questo catalizzatore ha giocato un ruolo …
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Analysis and Comparison of the Photodecomposition Reaction of Methanol on CeO2 Impregnated TiO2 Surfaces Versus Bare TiO2 Surfaces
<p>Titanium dioxide (TiO<sub>2</sub>) has been well-studied primarily due to its unique photocatalytic activity. Different preparation techniques have been developed to increase its photocatalytic activity by various means, including simply increasing the surface area, changing the makeup of the …
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Study of the effects of promoters (MnOx and FeOx) on Co3O4/CeO2 during Preferential Oxidation of Carbon monoxide
… on the stability of the Co3O4 phase supported on CeO2 and CO-PROX activity. Monodispersed Co3O4 nanoparticles were synthesized via a surfactant-free non-aqueous thermal method. 10 wt.% Co3O4 was supported and promoted via wet impregnation using ultrasonication. The addition of the promoters …
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Chronic Impact Of Cerium Oxide Nanoparticles On Solanum Lycopersicum L. And Brassica Rapa L.
Cerium Oxide Nanoparticles (CeO2-NPs) are commonly used in polishing, engine enhancement agents and many other commercial products. Increased applications and accidental release have raised concerns on the potential impact of CeO2-NPs on the environment. Most previous studies focused on the short …
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Trapping Platinum on Ceria: Role of Surface Facets
… robust catalysts. A promising support for Pt is CeO2. Altering the synthesis of CeO2 can allow for different nanoshapes to be formed which lead to different surface facets being exposed. The three types of nanoshaped CeO2 synthesized for the catalyst are polyhedra, rods, and cubes, which expose …
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Carbon Monoxide Oxidation on Nanoparticle Catalysts and Gas Phase Reactions of Small Molecules and Volatile Organics with Metal Cations
… supported on a variety of oxide supports such as CeO2, TiO2, CuO and MgO.The results indicate that Au nanoparticles supported on CeO2 exhibit higher catalytic activity than Au supported on other oxides. The high activity of the Au/CeO2 catalyst is attributed to the strong interaction of Au with …
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Estudio de ánodos basados en (La,Sr)TiO3 y CeO2 modificados con Pd para su aplicación en celdas IT-SOFC alimentadas con CH4
… cristalinas tipo perovskita (SrTiO3) y fluorita (CeO2), así como en materiales compuestos que combinan ambas fases, con el objetivo de optimizar su desempeño global como materiales de ánodo de IT-SOFC de alimentación directa de metano. La investigación se inicia con el estudio de las perovskitas …
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Nanoparticle-based electrochemical sensors for the detection of lactate and hydrogen peroxide
… of electrochemical lactate biosensors using CeO2 and CeO2-based mixed metal oxide nanoparticles, chapter 5 and 6 show the development of electrochemical hydrogen peroxide sensors by the decoration of the electrode surface with palladium-based nanoparticles. First generation oxidase …
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Colloidal Cerium Oxide Nanoparticle: Synthesis and Characterization Techniques
… on cerium oxide nanocrystalline particles. While CeO2 is the stable form of bulk cerium oxide, ceria nanoparticles exhibit a nonstoichiometric composition, CeO2-γ, due to the presence of oxygen vacancies and the formation of Ce2O3 at the grain boundaries. The Ce(III) ions, which are more reactive …
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The effect of radiation damage by fission fragments on the structural stability and dissolution of the UO2 fuel matrix
… and doped ‘SIMFUEL’ disks of UO2, undoped bulk CeO2 and thin films of UO2 and CeO2 with high energy Xe and U ions. The UO2 thin films, with thicknesses in the range of 90 – 150 nm, were deposited onto (001), (110) and (111) orientations of single crystal LSAT (Al10La3O51Sr14Ta7) and YSZ …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
Rh,Pd/CeO2 nanocatalysts exhibit excellent activity and stability for ethanol steam reforming (ESR) at 400°C. This thesis encompasses experimental and computational investigations of this nanocatalyst. The activation mechanism of Rh,Pd/CeO2 nanocatalysts under ethanol steam reforming conditions is …
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