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Showing 1 to 20 of 27 for “"Pd/C"”.
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Development of oxorhenium complexes and bimetallic Re-Pd/C catalysts for perchlorate reduction in water
… rhenium (Re) species with metallic palladium (Pd) nanoparticles on activated carbon support materials (Re-Pd/C). An oxorhenium(V) complex, Re(O)(hoz)2Cl (hoz = 2-(2’-hydroxyphenyl)-2-oxazoline), is synthesized as the precursor for a highly active metal center for oxygen atom transfer (OAT) …
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Development of a sustainable water treatment technology for oxyanions using palladium-based catalysts: catalyst design, reaction mechanisms, and life cycle assessment
… is catalytic reduction using supported Pd-based catalysts and an electron donor. While the technology is promising, several challenges need to be addressed before it is adapted by water treatment utilities. The overall goal of my thesis is to contribute to the development of catalytic …
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Utilizacao do limoneno como doador de hidrogenio na reducao catalitica por transferencia de algumas cetonas cataliticas alfa, beta insaturadas
… como doador o limoneno e como catalisador 10% Pd/C foi experimentada em cinco cetonas alicíclicas, α,8-insaturadas de seis membros e em uma cetona alifática α, ß,γ ,δ-insaturada. Vários parâmetros de reação foram investigados e tendo como subtrato modeelo a ísoforone. Observou-se 100% de …
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Investigation of synthetic methods for preparation of 2<sup>o</sup>-amino derivatives of 5-amino- 1, 10-phenanthroline: Applications to Cu<sup>+2</sup> based impedance sensors
… halides gave significantly better results than Pd/C catalyzed mono N-alkylation with aldehydes and alkylation of 5-aphen with the PPh3/DDQ system.</p>
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Synthesis and Antiviral Evaluation of Some 3'-Carboxymethyl-3'-deoxyadenosine Derivatives
… (5) via one-pot reduction/acylation employing H2/Pd-C followed by treatment with p-nitrophenyl N-methylcarbamate. The latter step of this two-step process required an efficient source of p-nitrophenyl N-methylcarbamate, thus a highly efficient new method for preparing p-nitrophenyl …
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Síntese e análise estrutural de novos ciclopaladatos e síntese de N-heterociclos a partir de ciclopaladatos e alenos
… que são compostos cíclicos com uma ligação Pd-heteroátomo, permite a formação de novas estruturas cíclicas contendo algum heteroátomo, como nitrogênio, oxigênio ou enxofre. Neste trabalho foram sintetizadas aminas propargílicas capazes de se coordenar a sais de paládio, formando novos …
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Hydrogen sorption in palladium doped microporous materials
… Pearls and Maxsorb carbon samples with 5 wt.% Pd/C resulted in fractionally higher hydrogen uptakes (0.01 wt.%). These results bore a closer resemblance to a physical mixture of Pd and carbon which suggested that the bridges had not been formed and spillover was not occurring. A higher wt.% Pd …
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Palladium -catalyzed synthesis of carbazole derivatives and formal total syntheses of several naturally occurring carbazole alkaloids
… of 2-(2-nitrophenyl)-2-cyclohexen-1-one using Pd(dba)2 (6 mol%), 1,3-bis(diphenylphosphino)propane (6 mol%), 1,10-phenanthroline monohydrate (12 mol%), and carbon monoxide (90 psi) in DMF at 80°C. 2-(2-Nitrophenyl)-2-cyclohexen-1-one was prepared via a Stille coupling of …
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The hydrogenation of nitrobenzene over metal catalysts
… deactivation. Initial investigations over Pd/C catalysts revealed the reaction to be sensitive to the solvent and the nature of the carbon support. However more importantly it was shown that the first intermediate in Haber’s scheme, nitrosobenzene, could not act as an intermediate to …
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Aliphatic Nitroxyl Radicals as Antifatigue Agents for Rubbers
… The activity was improved by attaching PD-C and CB-D antioxidant functions to the alicyclic nitroxyl radicals. On the other hand N-alkyl aldonitrones containing semi-hindered phenolic antioxidant functions were good antifatigue agents. Optimum activity was achieved when they were …
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Synthese, Stereochemie und pharmakologische Charakterisierung von 3,7-Diazabicyclo[3.3.1]nonan Derivaten als selektive kappa-Agonisten
… 4-Piperidon-3,5-dicarbonsäureestern (PDS: 4-20) umgesetzt, die wiederum ebenfalls durch eine Mannich-Kondensation mit zwei Äquivalenten Formaldehyd und einem Äquivalent eines primären Amins in THF oder Aceton zu den entsprechenden 9-Oxo-BNDS reagieren. Dieser Syntheseschritt wurde …
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A Survey Of School Principals And Teachers Regarding Teachers' Professional Development Participation
… of teachers in professional development (PD), and secondly, to determine if there was a significant differences in the amount of participation of teachers from different academic departments in these activities. Results indicated that a teacher's assignment to a particular academic …
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Synthesis and Chemical Bonding of Lithium and Alkaline-Earth Metal-based Carbometallates
… elements. Two new palladium-based compounds, Ca2Pd3C and LiCa2Pd2, were also synthesized albeit these are not carbometallates. The metal carbide Ca2Pd3C crystallizes in space group P63/mmc and is just the second representative in the Ca-Pd-C ternary system. It features a Pd Kagomé net. The …
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Green Diesel Production Via Catalytic Hydrogenation/decarboxylation Of Triglycerides And Fatty Acids Of Vegetable Oil And Brown Grease
… the product selectivity. The commercial 5% Pd/C catalyst was highly active for the decarboxylation of brown grease to green diesel at 300 °C and 1.5 MPa. </p> <p>Second, a class of Pd catalyst supported on a silica–activated carbon nanocomposite for free fatty acid decarboxylation was …
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Vom Phenol zum Naturstoff : Entwicklung nachhaltiger Mikrowellen-vermittelter SUZUKI-MIYAURA-Kupplungen und Tandem-Reaktionen
… Methoden zum Aufbau von Biphenolen mittels Pd/C-katalysierten Suzuki-Miyaura-Kupplungen entwickelt. Diese Methoden sind insofern äußerst effizient, da der ansonsten gebräuchliche Syntheseweg über drei Reaktionsschritte somit auf lediglich eine Reaktionsstufe reduziert wurde. Weiterhin wurden …
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Synthesis and Characterization of Platinum-Based Fuel Cell Catalysts
… were produced by spontaneous deposition of Pd on Pt nanoparticles. The CO stripping peak showed positive shift with increasing Pd. The optimum Pd packing density was 0.79 for Pt/Pd and 1.5 for Pt/Pd/C. From the analysis of the 13C NMR data, we concluded that (1) CO chemisorbed onto the Pt/Pd …
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Synthetic Applications Of The Photochemical Cycloaddition Reactions Of N-acylindoles And Conformational Studies Of The Cycloadducts
… desired indole derivative 166 was formed by the Pd/C dehydrogenation. (Abstract shortened by UMI.)
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Boron-carbon-nitrogen heterocycles for hydrogen storage: Synthesis and characterizations
… of 1,6;2,3-bis BN cyclohexane in the presence of Pd/C at RT. Under thermal activation, the gravimetric capability is > 9 wt%, which means 4 eq. H₂ is released from 1 eq. 1,6;2,3-bis BN cyclohexane. The thermal dehydrogenation pathway was studied via FTIR and NMR analyses. Finally, regeneration of …
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Development of Heterogeneous Catalysts for Upgrading Biomass Pyrolysis Bio-Oils into Advanced Biofuels
… °C, 250 °C and 300 °C) on PSD bio-oil HDO over Pd/C catalyst was investigated. The results show that 250 °C yielded biofuel with the highest heating value at 30.17 MJ/kg and the highest hydrocarbons content at 24.09%. In bio-oil HDO using zinc metal only, 400°C bio-oil upgrading process produced …
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