Alumina-supported Pd, Ag and Pd–Ag catalysts: Preparation through the polyol process, characterization and reactivity in hexa-1,5-diene hydrogenation

Sales, Emerson Andrade; Benhamida, Béatrice; Caizergues, Virginie; Lagier, Jean-Pierre; Fiévet, Fernand; Bozon‐Verduraz, François

doi:10.1016/s0926-860x(98)00124-0

Cited by 75 publications

(5 citation statements)

References 30 publications

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“…The high resistance to oxidation and corrosion, the unique optical properties, and the ease of preparation of NMNPs have made these systems interesting for fundamental scientific studies, including exploration of particle‐growth mechanisms. NMNPs find interesting applications in the fields of optics,18 chemical‐ and biosensing,19–23 catalysis,24, 25 electronics,26, 27 and so forth 28–30. Currently NMNP systems are being studied extensively in the context of anisotropic particles with a variety of shapes from simple cubes to branched multipods 29, 31, 32…”

Section: Introductionmentioning

confidence: 99%

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

2010

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Metal nanoparticles have been the subject of widespread research over the past two decades. In recent years, noble metals have been the focus of numerous studies involving synthesis, characterization, and applications. Synthesis of an impressive range of noble metal nanoparticles with varied morphologies has been reported. Researchers have made a great progress in learning how to engineer materials on a nanometer length scale that has led to the understanding of the fundamental size- and shape-dependent properties of matter and to devising of new applications. In this article, we review the recent progress in the colloid-chemical synthesis of nonspherical nanoparticles of a few important noble metals (mainly Ag, Au, Pd, and Pt), highlighting the factors that influence the particle morphology and discussing the mechanisms behind the nonspherical shape evolution. The article attempts to present a thorough discussion of the basic principles as well as state-of-the-art morphology control in noble metal nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

2010

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“…A wide variety of modification methods has been reported in the literature for the deposition of Pd on solid surfaces, such as ion exchange . impregnation, , polyol process, photocatalytic deposition, and sol–gel method. , These techniques generally employ Pd with an active component precursor and are classified as nonselective depositions, because no interaction exists between Pd and the precursor. Their major disadvantage is the weak interaction between the two components .…”

Section: Introductionmentioning

confidence: 99%

Study of the Electroless Deposition of Pd on Cu-Modified Graphite Electrodes by Metal Exchange Reaction

2008

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The electroless deposition of Pd on Cu-modified graphite electrodes using a metal exchange reaction was investigated. The modification procedure consisted in the electrodeposition of Cu on the graphite electrode, subsequently replaced by Pd at open circuit in a Pd-containing solution. The influence of experimental conditions on the exchange reaction rate, the chemical state and the distribution of Cu and Pd on the electrode surface are highlighted. The resulting deposits were studied using cyclic voltammetry, atomic absorption spectroscopy, scanning electron microscopy, energy-dispersive X-ray, and X-ray photoelectron spectroscopy. The last technique confirmed the spontaneous oxidation of Cu by the Pd complexes adsorbed on the electrode surface and also demonstrated that Pd/Cu atomic ratio increases by increasing the PdCl2 concentration. An increase of the Pd electroactive surface area, estimated by cyclic voltammetry, was observed by increasing the initial Cu loading, the exchange reaction time or the PdCl2 concentration. It was also demonstrated that the metal exchange reaction leads to the formation of a Cu core enveloped by a Pd shell for every PdCl2 concentration investigated here. The corrosion rate for the corrosion of copper by a Pd complex was determined and compared with that of the corrosion of copper by oxygen. On the basis of our observations, a general model to describe the Cu−Pd exchange process and the resulting electrode surface composition was proposed.

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“…The binding energy shifts of the main Pd 3d spin‐orbit peaks (0.3 eV found for the uncoated bimetallic catalyst) and Ag 3d spin‐orbit peaks (0.6 eV shift to lower binding energy compared to bulk silver at 368 eV) suggests formation of a nanoalloy [34] . These shifts would also imply electron donation to Pd (from Ag) and would explain the slight deviation in the binding energy measured for the Ag 3d 3/2 spin‐orbit peak (∼367 eV vs bulk Ag at ∼368 eV) [35] …”

Section: Resultsmentioning

confidence: 99%

The Effect of Coating Pd/Al₂O₃ and PdAg/Al₂O₃ Catalysts with [BMIM][DCA] for the Selective Hydrogenation of 1‐Octyne in 1‐Octene

et al. 2022

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The selective hydrogenation of octyne in a mixed 1-octyne/1octene feed was investigated by employing Pd/Al 2 O 3 and PdAg/ Al 2 O 3 catalysts coated with 1-butyl-3-methylimidazolium dicyanamide ([BMIM][DCA]) as SCILLs (Solid Catalysts with an Ionic Liquid Layer). All SCILLs were compared to an organically modified, 1-ethylimidazole (EIM) coated catalyst to determine if there is a SCILL effect. Results of the catalysis showed that both uncoated catalysts were highly active (100 % 1-octyne and 1octene conversion) in the hydrogenation reactions with dominant selectivity towards octane. No increase of 1-octene in the reactor outflow (octene gain) was noted. Coating 1Pd/Al 2 O 3 with [BMIM][DCA] at four monolayers (ML) corresponding to a surface loading of 45 wt% still gave 100 % octyne conversion but now with a 54 % 1-octene gain, as no octene was converted. Coating 1Pd9Ag/Al 2 O 3 with only a single monolayer of [BMIM][DCA] (14 wt%) was sufficient to give a 1-octene gain of 84 % at an octyne conversion of 91 %. Time-on-stream reactions for the uncoated and SCILL systems showed stable operation during the experiments.

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Alumina-supported Pd, Ag and Pd–Ag catalysts: Preparation through the polyol process, characterization and reactivity in hexa-1,5-diene hydrogenation

Cited by 75 publications

References 30 publications

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

Study of the Electroless Deposition of Pd on Cu-Modified Graphite Electrodes by Metal Exchange Reaction

The Effect of Coating Pd/Al₂O₃ and PdAg/Al₂O₃ Catalysts with [BMIM][DCA] for the Selective Hydrogenation of 1‐Octyne in 1‐Octene

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Alumina-supported Pd, Ag and Pd–Ag catalysts: Preparation through the polyol process, characterization and reactivity in hexa-1,5-diene hydrogenation

Cited by 75 publications

References 30 publications

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

Nonspherical Noble Metal Nanoparticles: Colloid‐Chemical Synthesis and Morphology Control

Study of the Electroless Deposition of Pd on Cu-Modified Graphite Electrodes by Metal Exchange Reaction

The Effect of Coating Pd/Al2O3 and PdAg/Al2O3 Catalysts with [BMIM][DCA] for the Selective Hydrogenation of 1‐Octyne in 1‐Octene

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The Effect of Coating Pd/Al₂O₃ and PdAg/Al₂O₃ Catalysts with [BMIM][DCA] for the Selective Hydrogenation of 1‐Octyne in 1‐Octene