Special Issue "Magnetic Nanocatalysts"

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (30 September 2017)

Special Issue Editors

Guest Editor
Dr. Adrián M.T. Silva

Laboratory of Catalysis and Materials (LCM). Associate Laboratory LSRE-LCM, Department of Chemical Engineering, Faculdade de Engenharia da Universidade do Porto (FEUP), Rua Dr. Roberto Frias, s/n, 4200-465, PORTO - Portugal
Website | E-Mail
Phone: +351-22-041-4908
Interests: nano- and macro-structured materials; magnetic nanocatalysts; separation and oxidation reactions; environmental catalysis
Guest Editor
Prof. Dr. Helder T. Gomes

Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Escola Superior de Tecnologia e Gestão, Instituto Politécnico de Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
Website | E-Mail
Interests: magnetic nanocatalysts; carbon-based materials; advanced oxidation processes; catalytic wet peroxide oxidation

Special Issue Information

Dear Colleagues,

Magnetic nanomaterials have been experience a great deal of increasing interest from specialists in catalysis. This interest arises from the magnetic properties of these materials, allowing the incorporation of in situ magnetic separation into reactor configurations and process designs. In addition, they have already proven high catalytic activity and stability in some applications. Magnetic nanocatalysts can be synthesized by different routes (co-precipitation, thermal decomposition, hydro/solvothermal, template-based, among many other methods), yielding either classical materials, based on elemental metals (as Fe, Co and Ni), and their oxides and ferrites, or advanced nanostructured composites, such as core- and yolk-shell structures. They are versatile materials, that fit very different catalytic applications in water treatment, selective synthesis of fine chemicals, oxygen reduction reaction, and the production of fuels, among others. Novel catalytic applications, involving innovative magnetic materials, designed at the nanoscale, are also being explored, such as emulsification/demulsification of biphasic systems with the action of amphiphilic catalysts and organic green reactions with silica-coated magnetic nanoparticles. The present Special Issue focuses on these magnetic nanocatalysts to address recent advances and future challenges in the synthesis, properties, and applications of these materials. Authors with expertise in this topic are cordially invited to submit their manuscripts to Catalysts. Significant full papers and review articles are very welcome.

Dr. Adrián M.T. Silva
Prof. Dr. Helder T. Gomes
Guest Editor

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Catalysts is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • magnetic catalysts
  • methods of synthesis;
  • advanced characterization
  • electrocatalysts and photocatalysts
  • bioinspired magnetic catalysts
  • design of magnetic reactors
  • process scale-up and full-scale proofs
  • catalytic water treatment, fine chemistry, oxygen reduction reaction
  • innovative catalytic applications

Published Papers (3 papers)

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Research

Open AccessArticle Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles
Catalysts 2017, 7(7), 222; doi:10.3390/catal7070222
Received: 28 June 2017 / Revised: 16 July 2017 / Accepted: 16 July 2017 / Published: 24 July 2017
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Abstract
A series of first-row-transition-metal ferrite magnetic nanoparticles (NPs) MFe2O4 [M = Mn2+ (1), Fe2+ (2), Co2+ (3), Ni2+ (4), Cu2+ (5) or Zn2+ (
[...] Read more.
A series of first-row-transition-metal ferrite magnetic nanoparticles (NPs) MFe2O4 [M = Mn2+ (1), Fe2+ (2), Co2+ (3), Ni2+ (4), Cu2+ (5) or Zn2+ (6)] were prepared by the co-precipitation method and characterized by Fourier transform infrared (FTIR) spectroscopy, powder X-ray diffraction (XRD), scanning electron microscope - energy dispersive X-ray spectrometry (SEM-EDS), vibrating sample magnetometer (VSM) and X-ray photoelectron spectroscopy (XPS). Those NPs were used as catalysts for the microwave-assisted oxidation of various alcohols in solvent-free medium. MnFe2O4 (1), CoFe2O4 (3) and CuFe2O4 (5) act as catalysts for the conversion of alcohols to the corresponding ketones or aldehydes with a yield range of 81 to 94% in 2 h at 120 °C using t-BuOOH as an oxidant. These catalysts can be readily isolated by using an external magnet and no significant loss of activity is observed when reused up to 10 consecutive runs. The effects of some parameters, such as temperature, time, type of oxidant and presence of organic radicals, on the oxidation reactions were also investigated. The presented literature overview highlights the advantages of our new 16 NPs catalytic systems in terms of efficiency and economy, mainly due the used microwave (MW) heating mode. Full article
(This article belongs to the Special Issue Magnetic Nanocatalysts)
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Open AccessArticle Recyclable Fe3O4 Nanoparticles Catalysts for Aza-Michael Addition of Acryl Amides by Magnetic Field
Catalysts 2017, 7(7), 219; doi:10.3390/catal7070219
Received: 20 June 2017 / Revised: 11 July 2017 / Accepted: 18 July 2017 / Published: 20 July 2017
PDF Full-text (7570 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
A nanostructure-based catalytic system has the advantages of both homogeneous and heterogeneous catalysis. It is of great significance to develop the sustainable and green process of homogeneous catalytic reaction. We report a novel, efficient and recyclable magnetic Fe3O4 nanoparticles-catalyzed aza-Michael
[...] Read more.
A nanostructure-based catalytic system has the advantages of both homogeneous and heterogeneous catalysis. It is of great significance to develop the sustainable and green process of homogeneous catalytic reaction. We report a novel, efficient and recyclable magnetic Fe3O4 nanoparticles-catalyzed aza-Michael addition reaction of acryl amides, and the magnetic nanoparticles catalysts can be recovered by external magnetic field. Both primary amine and secondary amine can react with various acryl amides providing a good output to target products successfully at room temperature. Further experiments reveal that the magnetic Fe3O4 nanoparticles-based catalyst shows excellent yields, which can be recycled 10 times, and, at the same time, it maintains a high catalytically activity. In this catalytic system, the tedious separation procedures are replaced by external magnetic field, which gives us a different direction for choosing a catalyst in a nanostructure-based catalytic system. Full article
(This article belongs to the Special Issue Magnetic Nanocatalysts)
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Open AccessArticle Dicyclopentadiene Hydroformylation to Value-Added Fine Chemicals over Magnetically Separable Fe3O4-Supported Co-Rh Bimetallic Catalysts: Effects of Cobalt Loading
Catalysts 2017, 7(4), 103; doi:10.3390/catal7040103
Received: 12 January 2017 / Revised: 22 February 2017 / Accepted: 14 March 2017 / Published: 30 March 2017
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Abstract
Six Co-Rh/Fe3O4 catalysts with different cobalt loadings were prepared by the co-precipitation of RhCl3, Co(NO3)2, and Fe(NO3)3 using Na2CO3 as the precipitant. These catalysts were tested for dicyclopentadiene
[...] Read more.
Six Co-Rh/Fe3O4 catalysts with different cobalt loadings were prepared by the co-precipitation of RhCl3, Co(NO3)2, and Fe(NO3)3 using Na2CO3 as the precipitant. These catalysts were tested for dicyclopentadiene (DCPD) hydroformylation to monoformyltricyclodecenes (MFTD) and diformyltricyclodecanes (DFTD). The results showed that the MFTD formation rate increased with increasing cobalt loading, whereas the DFTD formation rate initially increased and then decreased when the cobalt loading was greater than twice that of Rh. The DFTD selectivity was only 21.3% when monometallic Rh/Fe3O4 was used as the catalyst. In contrast, the selectivity was 90.6% at a similar DCPD conversion when the bimetallic 4Co-2Rh/Fe3O4 catalyst was employed. These catalysts were characterized by temperature-programmed reduction (TPR), temperature-programmed desorption (TPD), and thermogravimetric and differential thermal analyses (TG-DTA). The results obtained by these complimentary characterization techniques indicated that adding cobalt to the Rh/Fe3O4 catalyst enhanced the Rh reducibility and dispersion; the Rh reducibility was easily altered, and increasing the cobalt loading improved the Rh dispersion. It was concluded that the enhanced catalytic performance with increasing cobalt loading might be due to the formation of a more reactive Rh species with a different Rh–phosphine interaction strength on the catalyst surface. Full article
(This article belongs to the Special Issue Magnetic Nanocatalysts)
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