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Showing 1 to 11 of 11 for “"Pd/Al2O3"”.
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Reducción catalítica de nitratos en agua utilizando catalizadores Pd / Al2O3, monometálicos y promovidos
… 5). Los catalizadores utilizados fueron 32/OAlPd−γ y 32/OAlCuPd−−γ, sintetizados a partir de dos precursores diferentes de paladio. En este capítulo también se analiza la caracterización de los mismos. En una siguiente etapa, se realizó la evaluación de los mismos catalizadores pero ahora en la …
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CO and Hydrocarbon Oxidation on PD/Ceria-Zirconia/Alumina Three-Way Catalysts
… and acetylene oxidation were enhanced using Pd/CZO compared to Pd/Al2O3, as observed in light-off performance tests. Differences in reaction mechanisms utilizing the two catalysts were further investigated via steady state kinetic experiments. Ethylene oxidation was studied using Pd/CZO and …
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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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Methanol-Oxidation an getragenen Modellkatalysatoren
… Als Modellsystem werden hier unterschiedliche Pd-Nanopartikel auf eine Al2O3-Oberfläche aufgedampft -- Pd\Al2O3\NiAl(110): weitgehend kristalline von 5 nm-Größe und defektreiche von 2 nm-Größe. Zur Trennung der Prozesse wird an diesem Modell zunächst die CO-Oxidation bei 1,0x10^(-6) mbar und …
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Enhanced Methane Oxidation Catalysis Through Feed Modulation And Oxygen Storage
… effects of reductive H2 pulses were examined for Pd-Pt/Al2O3 and Pd-Pt/ CeO2 ZrO2-Y2O3-La2O3 catalysts. Alternating H2/O2 pulses resulted in significant and sustained methane oxidation activity, even when large quantities of H2O were present in the feed. The second part of the project involves the …
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Adatom Emission From Nanoparticles: Implications for Ostwald Ripening
… Precious metal-based catalysts such as Pt and Pd are currently used in catalytic converters. To achieve higher fuel efficiency, combustion can be carried out in excess air resulting in a reduction of greenhouse gas (GHG) emissions. Reduction of these emissions has emerged as a major challenge. …
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Vibrations for improving multiphase contact
… oil using a monolith catalyst washcoated with Pd/Al2O3. Hydrogenation of alpha-methyl styrene reaction was carried out under external mass transfer controlled conditions in the POMR and also in a stirred tank reactor. Results show activity improvement of up to 84% at 17.5 Hz over no-pulsing …
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Heterogeneous catalyzed macromolecular hydrogenations in oscillating systems
… out. A monolith-containing square die with Pd/Al2O3 catalysts was used to successfully hydrogenate poly(styrene) (PS). The inherent pulse behavior of the extruder was found to be sufficient to approach intrinsic kinetics at low polymer concentrations. At higher (10 wt% PS) concentrations, …
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Magnetic Resonance Studies of Three-Phase Heterogeneous Catalytic Hydrogenation Reactions
… liquids and imbibed in the catalyst material (Pd/Al2O3). Single component liquids as well as mixtures were investigated to understand their behaviour inside the porous catalyst material. A peak fitting method was developed to facilitate the quantification of species within a reactor from …
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Desarrollo de catalizadores monolíticos con sustrato de aluminio anodizado
… con paladio. Los catalizadores, denominados Pd/Al2O3/Al, fueron ensayados en reacción durante usos consecutivos, mostrando una desactivación progresiva conforme éstos son reutilizados. A fin de determinar las potenciales causas de desactivación se realizó un estudio sistemático buscando …
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The sintering and stability of catalytic nano-particles
… 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 atoms. The atoms emitted could be determined by the rate of …