Catalyst Recovery and Recycling Facilitated by Magnetic Separation: Iridium and Other Metal Nanoparticles

Jacinto, Marcos José; Silva, Fernanda P.; Kiyohara, Pedro Kunihiko; Landers, Richard; Rossi, Liane M.

doi:10.1002/cctc.201100415

Cited by 48 publications

(29 citation statements)

References 40 publications

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“…The activity of all prepared catalyst was similar to homogeneous palladium precursor PdCl 2 (PhCN) 2 (Table 3). The lower catalytic activity of the catalysts supported on the epoxy resin/PETMP we ascribe to fewer Pd sites being accessible to the reactants when these are attached to the polymer of lower microporosity.…”

Section: Activity and Stability Testsmentioning

confidence: 68%

“…1, can infl uence the activity of of cinnamaldehyde can give rise to three products, namely hydrocinnamaldehyde (HCALD), cinnamyl alcohol (CALC), and hydrocinnamyl alcohol (Scheme 1). 2 catalysts have been found to give poor selectivity to cinnamyl alcohol (CALC) after subsequent use, due to the reduction of the supported precursor. Cinnamyl alcohol (CALC) is strongly adsorbed on the Pd(0) catalyst surface and may undergo isomerisation to the hydrocinnamaldehyde (HCALD).…”

Section: Synthesis and Characterization Of Palladium Catalystsmentioning

confidence: 99%

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Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

Bączek

Strzelec

Wąsikowska

2013

Polish Journal of Chemical Technology

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In this work, the application of the thiol-functionalized epoxy resin encapsulated on magnetic core as supports for palladium catalysts is reported. The study focuses on obtaining of heterogeneous catalysts which can be separated by magnetic fi eld. Palladium complex catalyst [PdCl 2 (PhCN) 2 ] has been heterogenized by anchoring to these supports via ligand exchange reaction. The characterization of polymeric supports and heterogenized palladium catalysts has involved research methods like time-of-fl ight secondary ion mass spectrometry (TOF-SIMS), scanning electron microscopy (SEM) and nitrogen BET surface area measurements. The activity and stability during long-term use of the investigated catalytic systems were tested in a Heck and hydrogenation reaction. The infl uence of the type of thiols used as epoxy hardeners and the morphology of the supports on the catalytic properties of epoxy-supported palladium catalysts was discussed.

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Section: Activity and Stability Testsmentioning

confidence: 68%

Section: Synthesis and Characterization Of Palladium Catalystsmentioning

confidence: 99%

Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

Bączek

Strzelec

Wąsikowska

2013

Polish Journal of Chemical Technology

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“…This behavior was observed for Rh(III), 33 Pt(II), 34 and Ir(III) salts. 35 The metallic precursors loaded on the solids were reduced with hydrogen resulting in nearly 2-5 nm supported metal NPs (Fig. 2).…”

Section: Metal Deposition and Reduction On Functionalized Solid Supportsmentioning

confidence: 99%

Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Costa

Rossi

2012

Nanoscale

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2012Synthesis of supported metal nanoparticle catalysts using ligand assisted methods NANOSCALE, CAMBRIDGE, v. 4, n. 19, pp. 5826-5834, FEB, 2012 The synthesis and characterization methods of metal nanoparticles (NPs) have advanced greatly in the last few decades, allowing an increasing understanding of structure-property-performance relationships. However, the role played by the ligands used as stabilizers for metal NPs synthesis or for NPs immobilization on solid supports has been underestimated. Here, we highlight some recent progress in the preparation of supported metal NPs with the assistance of ligands in solution or grafted on solid supports, a modified deposition-reduction method, with special attention to the effects on NPs size, metal-support interactions and, more importantly, catalytic activities. After presenting the general strategies in metal NP synthesis assisted by ligands grafted on solid supports, we highlight some recent progress in the deposition of pre-formed colloidal NPs on functionalized solids. Another important aspect that will be reviewed is related to the separation and recovery of NPs. Finally, we will outline our personal understanding and perspectives on the use of supported metal NPs prepared through ligandassisted methods.

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“…The metallic precursors loaded on the silica-coated magnetic support previously modified with amine groups were reduced with hydrogen under mild conditions (typically 6 atm H 2 and 75-100 °C), resulting in nearly 2-5 nm supported metal NPs (Figure 6). Magnetically recoverable rhodium NPs, 54 platinum NPs 55 and iridium NPs 84 were prepared.…”

Section: Rhodium Platinum and Iridium Catalystsmentioning

confidence: 99%

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Rossi¹,

Garcia²,

Vono³

2012

J. Braz. Chem. Soc.

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O objetivo deste Account é fornecer uma visão geral de nossas atividades atuais de pesquisa, as quais envolvem a síntese e modificação de nanomateriais superparamagnéticos para aplicação na área de separação magnética e catálise. Primeiramente, uma introdução ao magnetismo e à separação magnética é feita. Em seguida, estratégias sintéticas que têm sido desenvolvidas para gerar nanopartículas superparamagnéticas revestidas esfericamente por sílica e outros óxidos, com destaque a sistemas bem caracterizados e preparados por metodologias que geram amostras de elevada qualidade e que, a princípio, podem ser produzidas em maior escala, são discutidas. Uma série de catalisadores magneticamente recuperáveis preparados em nosso grupo de pesquisa pela combinação única de suportes superparamagnéticos e nanopartículas metálicas é destacada. Este Account é concluído com observações pessoais e perspectivas neste campo de pesquisa.The aim of this Account is to provide an overview of our current research activities on the design and modification of superparamagnetic nanomaterials for application in the field of magnetic separation and catalysis. First, an introduction of magnetism and magnetic separation is done. Then, the synthetic strategies that have been developed for generating superparamagnetic nanoparticles spherically coated by silica and other oxides, with a focus on well characterized systems prepared by methods that generate samples of high quality and easy to scale-up, are discussed. A set of magnetically recoverable catalysts prepared in our research group by the unique combination of superparamagnetic supports and metal nanoparticles is highlighted. This Account is concluded with personal remarks and perspectives on this research field.

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Catalyst Recovery and Recycling Facilitated by Magnetic Separation: Iridium and Other Metal Nanoparticles

Cited by 48 publications

References 40 publications

Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

Magnetic recykling of complex catalysts immobilized on thiol-functionalized polymer supports

Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

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