Colloidal Rhodium in Polyvinyl Alcohol as Hydrogenation Catalyst of Olefins

Hirai, Hidefumi; Nakao, Yukimichi; Toshima, Naoki; Adachi, Koichi

doi:10.1246/cl.1976.905

Cited by 107 publications

(70 citation statements)

References 7 publications

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“…poly(N-vinyl-2-pyrrolidone), polivinyl alcohol, dodecylamine) in order to prevent undesired particle growth and aggregation. A number of authors have prepared colloidal Rh nanoparticles of controlled size using a chemical reduction method to test their behavior as catalysts in different reactions [9,[25][26][27]. However, the dependence of activity on the particle size is so far not clear in HDC, where Rh-based catalysts have shown highly active [11,28].…”

Section: Introductionmentioning

confidence: 99%

Effect of size and oxidation state of size-controlled rhodium nanoparticles on the aqueous-phase hydrodechlorination of 4-chlorophenol

Baeza

Calvo

Gilarranz

et al. 2014

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Effect of size and oxidation state of size-controlled rhodium nanoparticles on the aqueous-phase hydrodechlorination of 4-chlorophenol

Baeza

Calvo

Gilarranz

et al. 2014

Chemical Engineering Journal

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“…To prevent the agglomeration, metal nanoparticles are protected by polymers which have coordination properties for the metal surfaces that are usually prepared as colloidal forms by reduction of metal ions in the presence of polymeric stabilizers such as poly(vinyl alcohol), poly(vinylpyrrolidone), and poly(vinyl ether) ( Fig. 1.2) [11,12]. Although these polymer-stabilized metal nanoparticles are stable in solution and easily prepared, requirement of large amount of polymers to stabilized metal nanoparticles inhibits close-packed assembly of the metal cores.…”

Section: Design Of Nanoparticle-based Building Blocksmentioning

confidence: 99%

Nanohybridized Synthesis of Metal Nanoparticles and Their Organization

Naka

Chujo

2009

Nanohybridization of Organic-Inorganic Materials

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Metal nanoparticles have various unusual chemical and physical properties compared with those of metal atoms or bulk metal due to the quantum size effect and their large superficial area, which make them attractive for applications such as optics, electronics, catalysis, and biology [1,2]. The catalytic properties of metal nanoparticles have generated great interest over the past decade. Among various metal nanoparticles, gold nanoparticles have tremendously high molar absorptivity in the visible region. Particle aggregation results in further color changes of gold nanoparticles solutions due to mutually induced dipoles that depend on interparticle distance and aggregate size. This phenomenon can be applied to various sensing systems [3][4][5][6][7]. The assembly of gold, silver, or copper nanoparticle monolayers is one of the ideal substrate for surfaced-enhanced Raman scattering (SERS) [8,9].Bare metal nanoparticles are prepared by employing physical methods such as mechanic subdivision of metallic aggregates and evaporation of a metal in a vacuum by resistive heating or laser ablation. Chemical methods such as the reduction of metal salts in solution are the most convenient ways to control the size of the particles and modified the surface chemical composition. To exploit nanoparticle properties for future device fabrication, self-organization of nanoparticles in a controlled manner is required. To construct such devices, new fabrication techniques must be developed with suitable metal nanoparticle-based building blocks. Several patterns for self-assemblies of the metal nanoparticles are schematically illustrated in Fig. 1.1. A number of outstanding reviews on the synthesis and assembly of metal nanoparticle-based building blocks have appeared [2,10]. This chapter highlights recent fabrication techniques of hybrid metal nanoparticles by controlled self-organization of the metal nanoparticle-based building blocks. Design of nanoparticle hybrids will be first focused on using building blocks for further assemblies. Several recent efforts have been concentrated on a system that

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“…In this paper we report rhodium nanocolloids preparation using aliphatic alcohols as the reducing agents [16][17][18][19][20] and polyvinylpyrrolidone (PVP) as the stabilizing polymer.…”

Section: Introductionmentioning

confidence: 99%

Rh(0) Nanoparticles: Synthesis, Structure and Catalytic Application in Suzuki–Miyaura Reaction and Hydrogenation of Benzene

Gniewek

Trzeciak

2013

Top Catal

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Rhodium colloids have been prepared by chemical reduction of an aqueous solution of rhodium trichloride with different aliphatic alcohols (from methanol to pentanol) in the presence of polyvinylpyrrolidone (PVP) as the stabilizing agent. The obtained Rh(0) nanoparticles have been characterized structurally by means of X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. Catalytic activity of the synthesized Rh/PVP colloids has been evidenced in the Suzuki-Miyaura coupling reaction of phenylboronic acid with bromobenzaldehyde. The choice of the reducing agent and reduction conditions enabled to obtain Rh(0) colloids showing various mean nanoparticle diameters (ranging from 3.8 to 6.0 nm) and different nanoparticle morphologies. These two factors play the decisive role from point of view of catalytic activity of the presented systems. The most active Rh/PVP catalyst, prepared using ethanol as the reducing agent, have also been applied in hydrogenation of benzene to cyclohexane, showing very high activity in this process.

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Colloidal Rhodium in Polyvinyl Alcohol as Hydrogenation Catalyst of Olefins

Cited by 107 publications

References 7 publications

Effect of size and oxidation state of size-controlled rhodium nanoparticles on the aqueous-phase hydrodechlorination of 4-chlorophenol

Effect of size and oxidation state of size-controlled rhodium nanoparticles on the aqueous-phase hydrodechlorination of 4-chlorophenol

Nanohybridized Synthesis of Metal Nanoparticles and Their Organization

Rh(0) Nanoparticles: Synthesis, Structure and Catalytic Application in Suzuki–Miyaura Reaction and Hydrogenation of Benzene

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