Silver nanoparticles supported on silica-coated ferrite as magnetic and reusable catalysts for oxidant-free alcohol dehydrogenation

Bayat, Ahmad; Shakourian‐Fard, Mehdi; Ehyaei, Nona; Hashemi, Mohammed M.

doi:10.1039/c4ra15498c

Cited by 40 publications

(32 citation statements)

References 29 publications

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“…Du 33 Kooti et al have successfully synthesized the CoFe 2 O 4 /SiO 2 /Ag composite through a three-step procedure for using as an antibacterial agent of both Gram-positive and Gram-negative bacteria. Du 33 Kooti et al have successfully synthesized the CoFe 2 O 4 /SiO 2 /Ag composite through a three-step procedure for using as an antibacterial agent of both Gram-positive and Gram-negative bacteria.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline

2015

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A novel sonochemical approach was developed for the synthesis of different core/shell structures of Fe3O4/SiO2/Ag nanocubes and SiO2/Ag nanospheres. The total reaction time of the three sonochemical steps for the synthesis of Fe3O4/SiO2/Ag nanocubes is shorter than that of the previously reported methods. A proposed reaction mechanism for the sonochemical functionalization of the silica and the silver on the surface of magnetic nanocubes was discussed in detail. Transmission electron microscopy revealed that the surface of Fe3O4/SiO2 nanocubes was decorated with small Ag nanoparticles of approximately 10-20 nm in size, and the energy dispersive spectroscopy mapping analysis confirmed the morphology of the structure. Additionally, X-ray diffraction data were used to confirm the formation of both phases of a cubic inverse spinel structure for Fe3O4 and bcc structures for Ag in the core/shell structure of the Fe3O4/SiO2/Ag nanocubes. The as-synthesized Fe3O4/SiO2/Ag nanocubes showed a high efficiency in the catalytic reduction reaction of 4-nitroaniline to 4-phenylenediamine and a better performance than both Ag and SiO2/Ag nanoparticles. The grafted silver catalyst was recycled and reused at least fifteen times without a significant loss of catalytic efficiency.

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Section: Introductionmentioning

confidence: 99%

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline

2015

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“…However, the designing of highly recyclable heterogeneous systems still remains a significant challenge for oxidant‐free dehydrogenation of alcohols. Our research group has previously reported silver nanoparticles supported on silica‐coated magnetic nanoparticles (Fe 3 O 4 @SiO 2 ‐Ag) as a heterogeneous catalyst for oxidant‐free alcohol dehydrogenation . Our results indicated that the reaction time was very long for oxidant‐free dehydrogenation of alcohols using Fe 3 O 4 @SiO 2 ‐Ag.…”

Section: Introductionmentioning

confidence: 67%

“…Also, O 2 ‐sensetive functional groups in the primary and secondary alcohols do not change in the oxidant‐free dehydrogenation of alcohols. In recent years, several homogeneous and heterogeneous catalysts have been designed and synthesized for oxidant‐free or acceptor‐free oxidation of alcohols . However, the designing of highly recyclable heterogeneous systems still remains a significant challenge for oxidant‐free dehydrogenation of alcohols.…”

Section: Introductionmentioning

confidence: 99%

Silver nanoparticles immobilized onto poly(4‐vinylpyridine)‐functionalized magnetic nanoparticles: A robust magnetically recyclable catalyst for oxidant‐free alcohol dehydrogenation

Bayat

Shakourian‐Fard

Talebloo

et al. 2017

Applied Organom Chemis

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A heterogeneous and recyclable catalyst with a high loading of silver nanoparticles was synthesized via the silver nanoparticles being supported onto the surface of magnetic nanoparticles coated with poly(4‐vinylpyridine). The synthesized catalyst was used in the dehydrogenation of alcohols to corresponding carbonyl compounds. A broad diversity of alcohols was converted into their corresponding carbonyl compounds in excellent yields. The catalyst was easily recovered by applying an external magnetic field and reused for seven reaction cycles without considerable loss of activity. The catalyst was fully characterized using various techniques.

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“…Then, 4 ml of tetraethyl orthosilicate (TEOS) was added dropwisely to the suspension at 40 °C under stirring for 30 min. The pH of this solution was adjusted to 10 by slow addition of NH 3 solution . The reaction mixture was refluxed for 8 hr to allow the base‐catalyzed hydrolysis and condensation of TEOS monomers on the nanoparticle surface go to completion.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of molybdenum (VI) complex immobilized on polymeric Schiff base‐coated magnetic nanoparticles as an efficient and retrievable nanocatalyst in olefin epoxidation reactions

Mortazavi-Manesh

Bagherzadeh

2019

Applied Organom Chemis

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In this study, a new polymeric functionalized magnetic nanocatalyst containing a molybdenum Schiff base complex was prepared using a few consecutive steps. Poly (methylacrylate)‐coated magnetic nanoparticles were synthesized via radical polymerization of methyl acrylate onto modified magnetic nanoparticles followed by the amidation of the methyl ester groups with hydrazine. Polymeric functionalization efficiently provides the advantage that more catalytic units can be grafted on the surface of magnetic nanoparticles. The functionalization process was continued with salicylaldehyde which introduced Schiff base groups on to the surface of the polymeric support. In the final step, the desired catalytic system was prepared via complexation of the Schiff base groups with MoO2(acac)2. The resulting nanoparticles were characterized by infrared spectroscopy, powder X‐ray diffraction, scanning and transmission electron microscopy, elemental analysis, inductively coupled plasma optical emission spectrometry, vibrating sample magnetometry and thermogravimetric analysis. This heterogenized catalytic system was also found to be highly active, sustainable and recyclable nanocatalyst in alkene epoxidation. Eventually, the attractive features of the synthesized catalyst such as simple work‐up, good stability, magnetic separation, high TOF and high surface area; make it appropriate for oxidation reactions.

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Silver nanoparticles supported on silica-coated ferrite as magnetic and reusable catalysts for oxidant-free alcohol dehydrogenation

Abstract: The oxidant-free dehydrogenation of alcohols to corresponding carbonyl compounds has been performed by using silver (0) nanoparticles supported on silica-coated ferrite as an efficient and recyclable heterogeneous catalyst.

Cited by 40 publications

References 29 publications

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline

Silver nanoparticles immobilized onto poly(4‐vinylpyridine)‐functionalized magnetic nanoparticles: A robust magnetically recyclable catalyst for oxidant‐free alcohol dehydrogenation

Synthesis and characterization of molybdenum (VI) complex immobilized on polymeric Schiff base‐coated magnetic nanoparticles as an efficient and retrievable nanocatalyst in olefin epoxidation reactions

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Silver nanoparticles supported on silica-coated ferrite as magnetic and reusable catalysts for oxidant-free alcohol dehydrogenation

Abstract: The oxidant-free dehydrogenation of alcohols to corresponding carbonyl compounds has been performed by using silver (0) nanoparticles supported on silica-coated ferrite as an efficient and recyclable heterogeneous catalyst.

Cited by 40 publications

References 29 publications

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe3O4/SiO2/Ag) and their superior catalytic reduction of 4-nitroaniline

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe3O4/SiO2/Ag) and their superior catalytic reduction of 4-nitroaniline

Silver nanoparticles immobilized onto poly(4‐vinylpyridine)‐functionalized magnetic nanoparticles: A robust magnetically recyclable catalyst for oxidant‐free alcohol dehydrogenation

Synthesis and characterization of molybdenum (VI) complex immobilized on polymeric Schiff base‐coated magnetic nanoparticles as an efficient and retrievable nanocatalyst in olefin epoxidation reactions

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A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline

A novel approach for the synthesis of ultrathin silica-coated iron oxide nanocubes decorated with silver nanodots (Fe₃O₄/SiO₂/Ag) and their superior catalytic reduction of 4-nitroaniline