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Showing 1 to 20 of 20 for “"Pd nanoparticles"”.
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Novel routes for synthesis of Pd nanoparticles and faceted ZnO supports for heterogeneous catalysts
… catalyst deactivates quickly and is pyrophoric. Pd catalysts are much more stable, but reactions using these catalyst follow the decomposition pathway, CH3OH --> 2H2+CO. PdZn alloys can achieve the desired selectivity, and have been noted to form under reaction conditions from Pd/ZnO …
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Palladium-catalyzed PMHS reductions of imines
We explored the Pd-catalyzed reductions of imines using polymethylhydrosiloxane (PMHS) in the presence of aqueous KF. This methodology developed by our group facilitates the reduction of nitrogen-containing functional groups under mild conditions and short reactions times. To the best of our …
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Continuous synthesis of metallic and oxidic palladium nanoparticles with tunable sizes for catalytic applications
… synthesis of palladium and palladium oxide nanoparticles for their use in three-way catalysts for air pollution remediation is presented. Coiled flow inverter microreactors are used to obtain PdO and Pd nanoparticles of various sizes and the optimised novel syntheses subsequently constitute …
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Development of sustainable Pd-based catalysts for removal of persistent contaminants from drinking water
Pd-based catalytic reduction has emerged as an advanced treatment technology for drinking water decontamination, and a suite of persistent contaminants including oxyanions, N-nitrosoamines, and halogenated compounds are amenable to catalytic reduction. The primary goal of this study is to develop …
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Understanding the effects of promoters on the direct synthesis of hydrogen peroxide over supported palladium catalysts
… various methods (addition of promoters, alloying Pd with other transition metals). The addition of promoters (e.g., inorganic acids, halide salts) is a common method to improve H2O2 selectivity and several studies have investigated the effect of the addition of a cocktail of promoters on H2O2 …
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Scanning transmission electron microscopy (STEM) and X-ray absorption spectroscopy (XAS) investigations of catalytic systems
… of various supported and unsupported noble metal nanoparticles using, predominantly, X-ray absorption spectroscopy (XAS) and scanning transmission electron microscopy (STEM) or spherical aberration-corrected STEM (Cs-STEM). Although the majority of the work focuses on γ-Al2O3 supported …
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In-situ electron imaging of oxidation and reduction of rutile (TiO2) nanocrystals and interaction with palladium
Metal nanoparticles supported on oxides exhibit excellent catalytic properties for chemical reactions that impact several industries, for example, Pd/CeO2 is used in the catalytic converters of automobiles for environmental remediation, Rh/ZrO2 is used for fuel refinement, and Pt/TiO2 is an …
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Catalytic Reduction of NO and N2O with Hydrogen in Water by Polymer-Protected Palladium Nanoparticles
… process. We have synthesized a water-soluble Pd/PVP colloid (PVP= poly(N-vinyl-2-pyrrolidone) by an alcohol reduction method. Nitric oxide and nitrous oxide reduction activities were determined by monitoring the headspace composition in a reaction flask by GC-MS. NO reduction rates were …
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Palladium (pd) decorated zinc oxide (ZnO) nanoparticles for gas sensing applications: meat spoilage gases
… this, materials of ZnO decorated with palladium nanoparticles were synthesised using the hydrothermal method for the purpose of testing their gas sensing properties. After the synthesis of these nanoparticles, various characterization techniques for the investigation of both physical and chemical …
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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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Sensitivity, selectivity, and stability of a palladium-loaded single-walled carbon nanotube methane gas sensor
… the SWNT. Here, SWNTs are loaded with palladium (Pd) nanoparticles using sodium dodecyl sulfate (SDS). The Pd-loaded SWNTs offer a detection mechanism for methane (CH 4) by comparing the PL intensity before and after exposure to CH₄.A significant PL change (relative to the experiment) indicates a …
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Exploiting imidate ligand effects in transition metal-mediated C-C bond forming processes
… and [AuBr3(NHC)]), Ru(II) ([RuCl2(CHR)(L2)]) and Pd(II) ([Pd(OAc)2]) complexes has been investigated. The activity of these complexes as (pre)catalysts in enyne cycloisomerisation and propargylic nucleophilic substitution, diene ring-closing metathesis and ring-opening metathesis polymerisation …
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Laser Vaporization Methods for the Synthesis of Metal and Semiconductor Nanoparticles; Graphene, Doped Graphene and Nanoparticles Supported on Graphene
… for the synthesis of metal and semiconductor nanoparticles, graphene, B- and N-doped graphene, and metal and semiconductor nanoparticles supported on graphene. These methods include the Laser Vaporization Controlled Condensation (LVCC) approach, which has been used in this work for the …
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Fabrication of Ultrathin Palladium Composite Membranes by a New Technique and Their Application in the Ethanol Steam Reforming for H₂ Production
… a new technique for the preparation of ultrathin Pd based membranes supported on a hollow-fiber α-alumina substrate for H₂ separation. The effectiveness of the membranes is demonstrated in the ethanol steam reforming (EtOH SR) reaction in a membrane reactor (MR) for H₂ production. The membrane …
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Connecting Thermodynamics and Kinetics of Ligand Controlled Colloidal Pd Nanoparticle Synthesis
Colloidal nanoparticles are widely used for industrial and scientific purposes in many fields, including catalysis, biosensing, drug delivery, and electrochemistry. It has been reported that most of the functional properties and performance of the nanoparticles are highly dependent on the particle …
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Hybride von Metall-Nanopartikeln mit hochverzweigten Polyethylenimin als lösliche, abtrennbare Katalysatoren
… environment, hybrids of dendrimers with metal nanoparticles have been investigated. Whereas the ideally perfectly branched dendrimers are tedious to prepare, which is a major drawback of using them as stabilizers, hyperbranched polymers, which possess a randomly branched topology, can be …
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Selective metallization and electronic self-healing for high performance carbon-based nanoelectronics
… an order of magnitude when the right metal (Pd) is chosen. Then, we introduce a different route to carry out the nanosoldering process by applying the metal precursor using a solution-mediated technique. The new process not only facilitates the selective metallization of Pd nanoparticles at …
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Design of Robust Heterogeneous Catalysts for Sustainable Chemistry
… with integrated late transition metal (Ni, Pd) nanoparticles (NPs) were designed, characterized and tested for their catalytic potential. For the decoration of SiCN support with metal NPs, a molecular approach was applied which makes the use of amido metal complexes for the chemical …
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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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Arc-discharge In Solution: A Novel Synthesis Method For Carbon Nanotubes And In Situ Decoration Of Carbon Nanotubes With Nanoparticles
… various parameters during synthesis of selected nanoparticles can be used to fabricate technologically important components. During the last decade, carbon nanotubes (CNTs) have been envisioned for a host of different new applications. Although carbon nanotubes can be synthesized using a variety …