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Showing 1 to 18 of 18 for “"mixed oxides"”.
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Mixed oxides as sintering aids for silicon nitride
Includes bibliographical references (pages 194-202).
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The Effects of Titania on Selected Electrical and Mechanical Properties of Hafnia Rich Mixed Oxides in the System Hafnia Zirconia Titania
Embargo set by: Seth Robbins for item 71878 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs
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Electrical characterisation of emerging photo anodes suited to water dissociation with an applied bias
… with the silicon below, or to use very thin oxides such as titanium dioxide, which when a catalyst is deposited on top creates a MOS structure. Of interest to the first option are the electrical properties of the Schottky junction in particular the barrier height, as this will dictate the …
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Nanopartículas de ouro suportadas em óxidos mistos de cério e ferro para a redução de NO por CO
Cerium-iron mixed oxides (solid solutions) (Ce1-xFexO2-δ, 0 ≤ x ≤ 0.2) were synthesized by the Pechini method and calcined in a two-step procedure (300 and 500 ºC). The oxides were extensively characterized to evidence the effects of Fe inserption into the CeO2 structure. Iron incorporation changed …
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In situ XAS-Untersuchungen zur Partialoxidation von Acrolein an Mischoxidkatalysatoren
Vanadium molybdenum mixed oxides have proven to be active and selective catalysts for the partial oxidation of unsaturated aldehydes. They are widely used in Megaton-scale industrial processes like the partial oxidation of acrolein to acrylic acid. The macroscopic reaction kinetics of vanadium …
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Low-Temperature Densification of Lead Zirconate Titanate With Vanadium Pentoxide Additions
… was prepared by coprecipitation from mixed oxides and butoxides. V(,2)O(,5) was incorporated as mill additions to the precalcined base PZT, as batch additions to the PZT during the coprecipitation process, and as mill additions to a commercially available PZT powder. Densification …
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Model systems for the study of active phase evolution in complex bimetallic catalysts (PdZn)
… Investigations into the Pd:Zn aerosol derived oxides demonstrated the existence of 2 mixed oxides, a previously undocumented (Pd,Zn)O and a greater characterized bulk (Zn,Pd)O. TEM and SEM were used to show to distinct phases of different morphologies and EDX showed the differences in Pd and Zn …
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Synthesis and catalytic application of functional transition metal oxides
… combustion catalysts such as transition metals oxides (TMOs), using an elaborated Pulsed Spray Evaporation Chemical Vapor Deposition (PSE-CVD) approach and improved understanding of their behavior. Catalysts based on TMOs were successfully synthesized by PSE-CVD. Comprehensive characterization …
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Evaluation of multilayer silicon carbide composite cladding under loss of coolant accident conditions
… open gap and low plenum pressure, thorium-based mixed oxides (MOX) are a promising fuel for SiC cladding because they have higher thermal conductivity and lower fission gas release (FGR). Previous efforts at MIT have modified the FRAPCON code to include thorium MOX fuel. In this work, the fission …
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Selective Oxidation Reactions: A Chemical Looping Approach
… cycle. For CL-ODH, MoVTeNbO multimetallic mixed oxides were prepared and investigated in CL mode for the production of ethylene from ethane. The main premise of this study was that MoVTeNbO catalysts have enough available oxygen to serve the dual function of an oxygen donor and a catalyst. …
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Von molekularen Precursoren zu Oxidphasen im System V2O5 / Nb2O5. Darstellung, Eigenschaften, katalytische Aktivität
In this work, mixed alkoxides of general formula [V(O)Nbx(OR)(3+5x)] (R = n-C3H7 and C2H5, x = 1, 4.5 and 9) are obtained. They are used to prepare complex (V/Nb)-pentoxides. Different spectroscopic methods, for example UV/VIS, resonance raman, infrared, temperature dependant 51V NMR and two …
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Recovery of rare earth elements (REE) from waste printed circuit boards (WPCBs) through heterotrophic bioleaching
… REE entrapment within complex compounds (e.g. mixed oxides and silicates). Furthermore, complexolysis of metals with the deprotonated organic acid was significant, particularly for Cu extraction. REE solubilization occurred within 24 hours, a considerably faster pace compared to published …
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Optimizing Adsorption Energies of Reaction Products and Intermediates on Metal/Metal Oxide Catalysts to Achieve High Activity and Tunable Selectivity in Solid-Gas Phase Reactions
… and also bulk catalysts. Bulk metal oxides or mixed oxides are widely used as heterogeneous catalysts in the current industry due to their ability for large-scale synthesis. However, the complex surface structures of metal oxides and mixed metal oxides, such as various oxidation …
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Development and characterization of solar energy conversion devices based on nanocomposite semiconductors
… which was used as a scaffold in order for the mixed halide perovskite (CH3NH3PbI3-xClx) to infiltrate exhibited a maximum power conversion efficiency of 12.86% which improved the efficiency of the PSCs with the pristine TiO2 over 28%. This is attributed to the better interfacial connection …
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Νέα υλικά ανόδου κελιών καυσίμου στερεού ηλεκτρολύτη (sofc) - παρασκευή, χαρακτηρισμός και έλεγχος ιδιοτήτων
Στα πλαίσια της αναζήτησης νέων μεθόδων παραγωγής ενέργειας υψηλής απόδοσης και φιλικής προς το περιβάλλον, ένα μεγάλο μέρος των ερευνητικών δραστηριοτήτων σε διεθνή κλίμακα έχει στραφεί στην ανάπτυξη της τεχνολογίας των κελιών καυσίμου στερεού ηλεκτρολύτη, SOFCs (Solid Oxide Fuel Cells). Ένα από …
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Valorización de etanol y acetona mediante procesos catalíticos
… to the ethanol gas phase condensation, two mixed oxides (Mg Al and Mg Zr) were studied following both the activity and stability. Deactivation is discarded under 400 ºC, whereas ethanol conversion decreases in 14 and 22 % at 450 ºC with Mg Al and Mg Zr, respectively. The main cause of this …
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Structural changes and dynamic behaviour of vanadium oxide-based catalysts for gas-phase selective oxidations
… are used either in the form of multicomponent mixed oxides and oxysalts, e.g., in the oxidation of n-butane (V/P/O) and of benzene (supported V/Mo/O) to maleic anhydride, or in the form of supported metal oxide, e.g., in the manufacture of phthalic anhydride by o-xylene oxidation, of sulphuric …
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CO AND CO2 HYDROGENATION BY FISCHER TROPSCH SYNTHESIS PROMOTED WITH IRON BASED HETEROGENEOUS CATALYSIS: DATA COLLECTION AND PROCESS DESIGN
… heterogeneous catalysts were investigated: (1) mixed oxides derived from hydrotalcites (e.g. Mg-Fe-Cu), synthesized via ultrasound-assisted co-precipitation (US) and, in some cases, subjected to ball milling (BM), and (2) iron catalysts supported on mesoporous metallosilicates, synthesized by …