Magnetically Recoverable Nanocatalysts

Polshettiwar, Vivek; Luque, Rafael; Fihri, Aziz; Zhu, Haibo; Bouhrara, Mohamed; Basset, Jean‐Marie

doi:10.1021/cr100230z

Cited by 1,591 publications

(813 citation statements)

References 199 publications

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“…Numerous opportunities and applications have arisen for hybrid nanomaterial developments by combining magnetic properties. Accordingly, magnetic NPs have attracted great interests owing to their unique characteristics and potential applications in various fields, such as magnetically-assisted drug delivery, magnetic resonance imaging, hyperthermia, magnetic separation of biomolecules, environmental remediation and, especially, the isolation and recycling of expensive catalysts [33]. As shown in Scheme 2, the catalysts incorporated with magnetic species can be easily separated from the reaction mixture.…”

Section: Sustainable Magnetic Nanostructured Catalystsmentioning

confidence: 99%

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Shokouhimehr

2015

Catalysts

183

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This review is focused on the strategies and designs of magnetic nanostructured catalysts showing the enhanced and sustainable catalytic performances for the heterogeneous reduction of nitoaromatics. Magnetic catalysts have the benefits of easy recovery and reuse after the completion of the reactions and green chemical processes. Magnetic separation, among the various procedures for removing catalysts, not only obviates the requirement of catalyst filtration or centrifugation after the completion of reactions, but also provides a practical technique for recycling the magnetized nanostructured catalysts. Consequently, discussions will address the methodologies and exemplars for the reusable magnetic composite catalysts. Because the synthesis of ideal magnetic nanostructured catalysts is of primary importance in the development of high-quality sustainable processes, the designs, preparation methods and recyclability of various recoverable magnetic nanostructured catalysts are emphasized. The representative methods and strategies for the synthesis of durable and reusable magnetic nanostructured catalysts are highlighted. The advantages, disadvantages, recyclability and the efficiency of the introduced heterogeneous systems have been explored in the reduction of nitrobenzene derivatives.

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Section: Sustainable Magnetic Nanostructured Catalystsmentioning

confidence: 99%

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Shokouhimehr

2015

Catalysts

183

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“…However, "non-magnetic" catalyst components must be immobilized in magnetic responsive supports, mostly comprised of magnetic nanoparticles (iron oxides, in particular, magnetite 28 or pure metals, such as cobalt, 29,30 because their high saturation magnetization) that are used as prepared or coated with organic polymers, carbon or silica. In this coating process, the major challenge is how to control the loading and distribution of superparamagnetic components in the matrix material and to achieve monodispersity of the final product.…”

Section: Advances In the Development Of Magnetic Responsive Supportsmentioning

confidence: 99%

“…Magnetic separation can be an alternative to the recovery of metal NPs immobilized onto magnetic supports, as recently reviewed. 28 In general, NP catalysts supported on solids exhibit higher catalytic activities than the same NPs applied in biphasic systems. 78,79 Our research group has used magnetic NPs as supports for catalysts of this type, especially to overcome the difficulty of filtering colloidal nanoparticle solutions.…”

Section: Development Of Magnetically Recoverable Metal Nanoparticle Cmentioning

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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“…[5,6] Therefore, the search for finding new support materials and heterogenization techniques is a hot research topic in modern research in catalysis. Among various solid supports used for the immobilization of metallic catalysts, magnetic nanoparticles have emerged as a robust and high-surface-area heterogeneous catalyst support, because they could not only stabilize the reaction catalytic species, but also improve the catalytic activity [7][8][9][10][11][12] The simple separation of MNPs-supported catalysts from products or mixture reaction by an external magnet is the most notable advantage of magnetic nanoparticles. [13][14][15] It is noteworthy that magnetic-supported catalysts can be reused many times while keeping their initial activity.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Fe3O4 nanoparticles supported imine/Thiophene‐nickel (II) complex: A new and highly active heterogeneous catalyst for the synthesis of polyhydroquinolines and 2, 3‐dihydroquinazoline‐4(1H)‐ones

Shiri

Heidari

Kazemi

2017

Applied Organom Chemis

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A new magnetically separable nickel catalyst (Ni(NO 3 ) 2− Imine/ThiopheneFe 3 O 4 @SiO 2 ) was readily prepared and structurally characterized by Fourier transform infrared spectroscopy (FT-IR), Scanning electron microscopy (SEM), Energy-dispersive X-ray spectroscopy (EDX), Vibrating sample magnetometer (VSM), X-Ray diffraction (XRD) and Atomic absorption spectroscopy (AAS).The Ni(NO 3 ) 2− Imine/Thiophene-Fe 3 O 4 @SiO 2 exhibited efficient catalytic activity in the synthesis of 2,3-dihydroquinazoline-4(1H)-ones and polyhydroquinolines.Catalysis research under water and solvent-free conditions makes also this synthetic protocol ideal and fascinating from the environmental point of view. The catalyst can be magnetically recovered after the reaction and can be reused for many times without appreciable decrease in activity.

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Magnetically Recoverable Nanocatalysts

Cited by 1,591 publications

References 199 publications

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Magnetically Separable and Sustainable Nanostructured Catalysts for Heterogeneous Reduction of Nitroaromatics

Recent advances in the development of magnetically recoverable metal nanoparticle catalysts

Magnetic Fe3O4 nanoparticles supported imine/Thiophene‐nickel (II) complex: A new and highly active heterogeneous catalyst for the synthesis of polyhydroquinolines and 2, 3‐dihydroquinazoline‐4(1H)‐ones

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