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Showing 1 to 20 of 87 for “"ceria"”.
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Processing and characterization of nanocrystalline ceria
"Ceria and doped ceria have been extensively investigated and applied in various industrial fields, including automotive, energy, polishing media, paint additives and cosmetics. The use of high surface area, nanocrystalline CeO₂ powder could benefit all of these applications. This is particularly …
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CO oxidation catalysis with substituted ceria nanoparticles
… In this thesis, the preparation of substituted ceria nanoparticles is described to bring about a fundamental understanding of the structure of the active sites, mechanism and design descriptors for CO oxidation on ceria-based catalysts. Monodisperse, single-phase nanoparticles of late first-row …
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Partial Oxidation of Hydrocarbons Over Ceria Zirconia Catalysts
… Next, methane partial oxidation over ceria zirconia catalysts is studied with infrared spectroscopy. Methane and oxygen concentrations are modulated to differentiate active and spectator species via modulation excitation spectroscopy. Aromatic and alkoxy surface species modulate in …
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Trapping Platinum on Ceria: Role of Surface Facets
Supported platinum catalysts are used in the automotive industry for the oxidation of CO, hydrocarbons, and NOx. Dispersed Pt provides active sites for these reactions to occur. During the use of these catalyst, high temperatures will cause Pt to become volatile and sinter, forming large particles …
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Effect of ceria and zirconia on nanoparticulate rhodium catalysts
… synthesised; at 1.6 Rh and 4 wt % Rh loading. Ceria and zirconia have been deposited on the pre-supported Rh catalysts by the controlled surface reaction between the reduced Rh surface and an organometallic precursors: Zr(acac)4 and Ce(acac)3, with different cerium : zirconium ratios: …
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Catalytic activation of Rh,Pd nanoclusters supported on Ceria
… is traced to the occupancy of the 4f states of ceria. The metal displays differing behaviour on the support, Pd10 does not show the donation to the support of Rh10. The bonding mechanism was seen to be different for both metal clusters where Pd10 shows a partial ionic mechanism while Rh10 shows …
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Electrical Conductivity and Defect Structure of Ceria - Zirconia Solid Solutions
Made available in DSpace on 2014-12-10T17:32:38Z (GMT). No. of bitstreams: 1 6915303.pdf: 2735266 bytes, checksum: ec8ad9d7fca8762f98afcd2986b0d24b (MD5) Previous issue date: 1969
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Formation and growth of irradiation-induced defect structures in ceria
… in the common fluorite-type ceramic oxide fuel, ceria (CeO2) was selected as a surrogate material of UO2 for this study. According to previous studies, ceramic materials with a fluorite crystal structure possess high radiation tolerance. Using CeO2 single crystals allowed for the observation of …
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Synthesis of perovskite-ceria composites for solar-to-fuel conversion
… conversion process. Materials such as ceria and gadolinium-doped ceria (GDC) have been determined to have excellent kinetics for this process but have a very high operating temperature. In contrast, perovskites have the advantage of a lower operating temperature but it comes at the …
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The development of ceria-based catalysts for automotive after-treatment applications
Ceria (cerium oxide) based materials have been widely used for catalytic applications including; fluid catalytic cracking, water gas shift reactions, solid oxide fuel cells and automotive catalytic after-treatment. It has often been the material of choice for supporting precious metals in many of …
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Oxidation of Carbon Monoxide Over Ceria and Alumina Supported Palladium Catalysts
<p>Palladium catalysts on both Al2O3 and CeO2, supports were studied for efficacy in low temperature carbon monoxide oxidation. Calcination temperatures were varied between 500-900°C for alumina supported catalysts and shown to have no significant difference in activity. X-Ray Photoelectron …
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CO and Hydrocarbon Oxidation on PD/Ceria-Zirconia/Alumina Three-Way Catalysts
… support material was compared to that of ceria-zirconia (CZO) as an alternate support with oxygen storage capacity in experimental studies. CO, propylene, and acetylene oxidation were enhanced using Pd/CZO compared to Pd/Al2O3, as observed in light-off performance tests. Differences in …
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Fission Gas Transport and Its Interaction With Irradiation Induced Defects in Lanthanum Doped Ceria
Various sets of quantitative experimental results were obtained to characterize the dose and temperature effects of irradiation. These results also help to benchmark simulation codes being developed with a kinetic Monte Carlo model. These experimental results include size and size distributions of …
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Development of Kinetic Monte Carlo Code to Study Oxygen Mobility in Lanthanum-doped Ceria
The purpose of this study was to develop a generalized Kinetic Monte Carlo code to study oxygen mobility in lanthanum-doped cerium oxide, and to demonstrate this code as a validation tool by simulating oxygen diffusion and comparing the results with experimental data to confirm the so-called …
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Fission gas transport and its interactions with irradiation-induced defects in lanthanum doped ceria
… and experimental efforts have been carried out. Ceria (CeO2) was selected as a surrogate material for Uranium Dioxide (UO2) due to its many similar properties. Lanthanum (La) was chosen as a dopant in CeO2 to investigate the effect of impurities in a controlled manner. The presence of La in the …
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Stoichiometry dependence of the evolution of the irradiated-induced defect clusters in lanthanum-doped ceria
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:39Z Item is restricted until 2014-02-01T00:50:07Z
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Design of optical characteristics of ceria nanoparticles for applications including gas sensing and up-conversion
… and structural characteristics of cerium oxide (ceria) nanoparticles synthesized using chemical precipitation. The dopants selected are samarium and neodymium, which have positive association energy with oxygen vacancies in the ceria host, and negative association lanthanides, holmium and erbium, …
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Investigation of Ni-Ceria Nanocatalysts: Improved Computational Methods Towards Hydrogen Production in Aquaprocessing of Heavy Oil
Ni-Ceria (Ni-CeO2) nanoparticles (NPs) are promising nanocatalysts for water splitting and water gas shift reactions due to the ability of ceria to temporarily donate oxygen to the catalytic reaction and accept oxygen after the reaction is completed. Therefore, elucidating how different properties …
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