Recoverable rhodium nanoparticles: Synthesis, characterization and catalytic performance in hydrogenation reactions

Jacinto, Marcos José; Kiyohara, Pedro Kunihiko; Masunaga, Sueli H.; Jardim, R. F.; Rossi, Liane M.

doi:10.1016/j.apcata.2007.12.018

Cited by 205 publications

(151 citation statements)

References 26 publications

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“…In several examples studied, the amount of metal ions loaded on the support was always higher in the functionalized silica by at least 10 times the amount loaded on non-functionalized silica. 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.…”

Section: Metal Deposition and Reduction On Functionalized Solid Supportsmentioning

confidence: 69%

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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Section: Metal Deposition and Reduction On Functionalized Solid Supportsmentioning

confidence: 69%

Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Costa

Rossi

2012

Nanoscale

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“…Silica-coated magnetite nanoparticles (Fe 3 O 4 @SiO 2 ) were obtained by the reverse microemulsion method reported elsewhere [11]. This method was chosen due to the high quality of the magnetic materials -spherically coated with silica -obtained with this methodology.…”

Section: Development Of Magnetic Supportsmentioning

confidence: 99%

Separation technology meets green chemistry: development of magnetically recoverable catalyst supports containing silica, ceria, and titania

Vono

Damasceno

Matos

et al. 2017

Pure and Applied Chemistry

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Magnetic separation can be considered a green technology because it is fast, efficient, consumes low energy, and minimizes the use of solvents and the generation of waste. It has been successfully used in laboratory scale to facilitate supported catalysts' handling, separation, recovery, and recycling. Only few materials are intrisically magnetic, hence the application of magnetic materials as catalyst supports has broaden the use of magnetic separation. Iron oxides, silica-coated iron oxides, and carbon-coated-cobalt are among the most studied catalyst supports; however, other metal oxide coatings, such as ceria and titania, are also very interesting for application in catalysis. Here we report the preparation of magnetically recoverable magnetic supports containing silica, ceria, and titania. We found that the silica shell protects the iron oxide core and allows the crystalization of ceria and titania at high temperature without compromising the magnetic properties of the catalyst supports.

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“…Many fine chemicals are usually complex multifunctional molecules with high boiling points and limited thermal stability, and thus reactions in the liquid phase and mild temperature are often required (Ziolek 2004). However, catalyst separation from the final product in liquid-phase reactions can be problematic due to the interaction between the catalyst and the liquid medium containing the substrate and products (Jacinto et al 2008). One useful strategy to overcome catalyst/ product separation drawbacks in those systems is the design of catalyst carriers with inherent magnetic properties.…”

Section: Introductionmentioning

confidence: 99%

Bimetallic magnetic PtPd-nanoparticles as efficient catalyst for PAH removal from liquid media

et al. 2017

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Monometallic Pd-and bimetallic PtPd-nanoparticles supported on a mesoporous magnetic magnetite@silica matrix resembling a core-shell structure (Fe 3 O 4 @mSiO 2 ) have been fabricated. The material was characterized by transmission electron microscope (TEM), high-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM), X-ray photoelectron spectra (XPS), energy dispersive spectroscopy (EDS) and inductively coupled plasma mass spectrometry (ICP-MS). The catalysts were applied in the removal of anthracene from liquid phase via catalytic hydrogenation. It was found that anthracene as a model compound could be completely converted into the partially hydrogenated species by the monometallic and bimetallic solids. However, during the recycling study the bimetallic material (Fe 3 O 4 @mSiO 2-PtPd-) showed an enhanced activity towards anthracene removal compared with the monometallic materials. A single portion of the PtPd-based catalyst can be used up to 11 times in the hydrogenation of anthracene under mild conditions (6 atm of H 2 , 75°C, 20 min). Thanks to the presence of a dense magnetic core, the catalysts were capable of responding to an applied external magnetic field and once the reaction was completed, catalyst/product separation was straightforward.

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Recoverable rhodium nanoparticles: Synthesis, characterization and catalytic performance in hydrogenation reactions

Cited by 205 publications

References 26 publications

Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Synthesis of supported metal nanoparticle catalysts using ligand assisted methods

Separation technology meets green chemistry: development of magnetically recoverable catalyst supports containing silica, ceria, and titania

Bimetallic magnetic PtPd-nanoparticles as efficient catalyst for PAH removal from liquid media

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