Size control and supporting of palladium nanoparticles made by laser ablation in saline solution as a facile route to heterogeneous catalysts

Marzun, Galina; Nakamura, Junji; Zhang, Xiaorui; Barcikowski, Stephan; Wagener, Philipp

doi:10.1016/j.apsusc.2015.01.108

Cited by 87 publications

(95 citation statements)

References 62 publications

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“…A rather novel catalyst preparation technique, namely Laser Synthesis and Processing of Colloids (LSPC) including pulsed Laser Ablation in Liquid (LAL) has recently been developed . Similar to the Bönnemann technique, the laser method is usually (but not exclusively) conducted as two‐step synthesis route where purely electrostatically stabilized, surfactant‐free metal or alloy nanoparticles with defined particle size and composition are prepared in liquid without organic additives and subsequently adsorbed onto a support material . The current state of LSPC has been reviewed recently but without focusing on catalyst development.…”

Section: High Catalytic Performance: Purity Mattersmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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Section: High Catalytic Performance: Purity Mattersmentioning

confidence: 99%

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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“…Pulsed laser ablation in liquids (PLAL) is aq uite recent approach for the production of ligand-free nanoparticles in liquid media and is ar esearch field that has attracted continuously growing interest. [11] To date, there are already many studies on laser-generated noble-metal nanoparticles, such as Pt, Au, or Pd, that deal with surfacec haracterization, [1][2][3][4][5][6][7][8][9][10][11][12][13][14] particle-size control [15][16][17][18] and the synthesis of alloy nanoparticles, such as PtAu, AuAg, and PtIr. Influentialf actors that affect the particle properties are primarily laser characteristics (fluence, pulse duration,wavelength), the target material, and the ablation environment.…”

Section: Introductionmentioning

confidence: 99%

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

et al. 2017

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The role of molecular oxygen dissolved in the solvent is often discussed as being an influential factor on particle oxidation during pulsed laser ablation in liquids. However, the formation of the particles during laser synthesis takes place under extreme conditions that enable the decomposition of the liquid medium. Reactive species of the solvent may then affect particle formation due to a chemical reaction in the reactive plasma. Experimental results show a difference between the role of dissolved molecular oxygen and the contribution from the oxygen in water molecules. Using a metallic Cu target in air-saturated water, laser ablation led to 20.5 wt % Cu, 11.5 wt % Cu O, and 68 wt % CuO nanoparticles, according to X-ray diffraction results. In contrast to particles obtained in air-saturated water, no CuO was observed in the colloid synthesized in a Schlenk ablation chamber in completely oxygen-free water. Under these conditions, less-oxidized nanoparticles (25 wt % Cu and 75 wt % Cu O) were synthesized. The results show that nanoparticle oxidation during laser synthesis is mainly caused by reactive oxygen species from the decomposition of water molecules. However, the addition of molecular oxygen promotes particle oxidation. Storage of the Cu colloid in the presence of dissolved oxygen leads, due to aging, to nanostructures with a higher oxidation state than the freshly prepared colloid. The XRD pattern of the sample prepared in air-saturated acetone showed no crystalline phases, which is possibly due to small crystallites or low particle concentration. Concentration of the particles by centrifugation showed that in the large fraction (>20 nm), even less oxidized nanoparticles (46 wt % Cu and 54 wt % Cu O) were present, although the solubility of molecular oxygen is higher in acetone than in water. The nanoparticles in acetone were stable due to a Cu-catalyzed graphite layer formed on their surfaces. The influence of the solvent on alloy synthesis is also crucial. Laser ablation of PtCu in air-saturated water led to separated large CuO and Pt-rich spherical nanoparticles, whereas homogeneous PtCu alloy nanoparticles were formed in acetone.

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“…PLA of solid targets in a liquid medium can be employed to obtain various compositions (metals, alloys, oxides, carbides and others) and morphologies (nanoparticles, nanocubes, nanorods, nanocomposites, etc.) One of the approaches to the catalyst synthesis consists in the deposition of colloidal solutions containing nanoparticles of noble metals, in particular those obtained by PLA, on the oxide or carbon supports [54][55][56][57] . In comparison with chemical methods, laser ablation in liquid is a simple and environmentally friendly technique that operates in water or organic liquids under ambient conditions.…”

Section: Introductionmentioning

confidence: 99%

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

Slavinskaya

Kardash

Стонкус

et al. 2016

Catal. Sci. Technol.

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Palladium and cerium oxide nanoparticles obtained by pulsed laser ablation (PLA) in liquid (water or ethanol) have been used as nanostructured precursors for synthesis of the composite Pd/CeO2 catalysts. The initial mixture of Pd and CeO2 nanoparticles does not show catalytic activity at temperatures lower than 100°C. It has been found that the composites prepared by PLA in alcohol are easily activated by calcination in air at 450-600°C demonstrating high activity at room temperature. Application of XRD, TEM and XPS reveals that laser ablation in water leads to the formation of large and well crystallized nanoparticles of palladium and CeO2, whereas ablation in alcohol results in formation of much smaller PdCx nanoparticles. The activation of the composites takes place due to the strong Pd-ceria interaction which occurs easier for highly-dispersed defective particles obtained in alcohol. Such interaction implies the introduction of palladium ions into the ceria lattice with formation of a mixed phase of PdxCe1-xO2-x-δ solid solution at the contact spaces of palladium and cerium oxide nanoparticles. The TPR-CO and XPS data show clearly that on the surface of the PdxCe1-xO2-x-δ solid solution the oxidized PdOx(s)/Pd-O-Ce(s) clusters are formed. These clusters comprise the highly reactive oxygen which is responsible for the high catalytic activity in LTO CO.Please do not adjust margins Please do not adjust margins CO (molecules/cm 3 ), X is the CO conversion, V RM is the reaction mixture rate (cm 3 /sec), m is the weight of the sample (g), and

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Size control and supporting of palladium nanoparticles made by laser ablation in saline solution as a facile route to heterogeneous catalysts

Cited by 87 publications

References 62 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

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Size control and supporting of palladium nanoparticles made by laser ablation in saline solution as a facile route to heterogeneous catalysts

Cited by 87 publications

References 62 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Role of Dissolved and Molecular Oxygen on Cu and PtCu Alloy Particle Structure during Laser Ablation Synthesis in Liquids

Metal–support interaction in Pd/CeO2 model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst

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Product

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Metal–support interaction in Pd/CeO₂ model catalysts for CO oxidation: from pulsed laser-ablated nanoparticles to highly active state of the catalyst