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Catalysts
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Magnetic Nanocatalysts
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Magnetic Nanocatalysts

A special issue of Catalysts (ISSN 2073-4344). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (30 September 2017) | Viewed by 28846

Special Issue Editors

Dr. Adrián M.T. Silva

E-Mail Website
Guest Editor
Laboratory of Separation and Reaction Engineering - Laboratory of Catalysis and Materials (LSRE-LCM), Faculdade de Engenharia da Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
Interests: water and wastewater treatment, desalination and reuse; advanced oxidation technologies; membrane technology; environmental monitoring
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Helder T. Gomes

E-Mail Website
Guest Editor
Mountain Research Centre (CIMO), Polytechnic Institute of Bragança, Campus de Santa Apolónia, 5300-253 Bragança, Portugal
Interests: heterogeneous catalysis; magnetic nanocatalysts; carbon-based materials; design, preparation, and characterization of catalysts; advanced oxidation processes; environmental catalysis; catalytic wet peroxide oxidation; valorization of sub-products; chemical engineering
Special Issues, Collections and Topics in MDPI journals

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

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

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 2700 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 (5 papers)

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Research

9874 KiB  
Article
Design and Application of Magnetic Photocatalysts for Water Treatment. The Effect of Particle Charge on Surface Functionality
by Anna Zielińska-Jurek, Zuzanna Bielan, Szymon Dudziak, Izabela Wolak, Zuzanna Sobczak, Tomasz Klimczuk, Grzegorz Nowaczyk and Jan Hupka
Catalysts 2017, 7(12), 360; https://doi.org/10.3390/catal7120360 - 27 Nov 2017
Cited by 52 | Viewed by 6241
Abstract
Core-interlayer-shell Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of [...] Read more.
Core-interlayer-shell Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 magnetic photocatalysts were obtained. A water-in-oil microemulsion system with suitable surfactants was used for functionalization of the magnetic core with silica interlayer and TiO2-based photocatalyst. Uncoated and coated particles were characterized by electrophoretic measurements, X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), specific surface area (BET) measurements, diffuse reflectance spectroscopy (DRS) and vibrating sample magnetometer (VSM) analysis. The pH of the solution and corresponding zeta potential was found to be essential for appropriate formation of ferrite core/silica interlayer/TiO2 shell nanocomposite, since the electrical charge controls interactions during functionalization of the magnetic core particles. Thus, the development of multilayer structure in the isoelectric point (IEP) region enhanced adhesion of ferrite, silica and titania particles. The obtained Fe3O4/SiO2/TiO2, CoFe2O4/SiO2/TiO2 and BaFe12O19/SiO2/TiO2 nanocomposites revealed superparamagnetic behavior. The decomposition rate of phenol and carbamazepine allowed to estimate their photocatalytic activity. Progress of photocatalytic mineralization of organic compounds was evaluated by total organic carbon (TOC) measurements. Photocatalytic activity measured in four subsequent cycles showed good reusability as no loss of efficiency of phenol degradation was observed. Full article
(This article belongs to the Special Issue Magnetic Nanocatalysts)
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5634 KiB  
Article
Synergistic Enhancement in Catalytic Performance of Superparamagnetic Fe3O4@Bacilus subtilis as Recyclable Fenton-Like Catalyst
by Pei Zheng, Zhe Pan and Jun Zhang
Catalysts 2017, 7(11), 349; https://doi.org/10.3390/catal7110349 - 20 Nov 2017
Cited by 13 | Viewed by 4361
Abstract
Novel well-defined superparamagnetic Fe3O4@Bacilus subtilis composite (Fe3O4@B. subtilis SPMC) was synthesized through a facile electrostatic attraction method and used as a recyclable heterogeneous Fenton-like catalyst. With the presence of H2O2 [...] Read more.
Novel well-defined superparamagnetic Fe3O4@Bacilus subtilis composite (Fe3O4@B. subtilis SPMC) was synthesized through a facile electrostatic attraction method and used as a recyclable heterogeneous Fenton-like catalyst. With the presence of H2O2, Fe3O4@B. subtilis SPMC can remove nearly 87% of the doxycycline at the initial concentration of 50 mg L−1, exhibiting enhanced Fenton-like catalytic performance than pristine Fe3O4. The mechanism study demonstrates the synergistic effect between Bacilus subtilis adsorption and Fenton-like ability of Fe3O4 dominates the enhancement for Fenton-like catalytic efficiency of Fe3O4@B. subtilis SPMC. The obtained composite shows excellent recycling ability, reusability, and stability, which pave a new way for future design on highly efficient Fenton-like catalyst for degradation of organic pollutants. Full article
(This article belongs to the Special Issue Magnetic Nanocatalysts)
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5108 KiB  
Article
Solvent-Free Microwave-Induced Oxidation of Alcohols Catalyzed by Ferrite Magnetic Nanoparticles
by Nuno M. R. Martins, Luísa M. D. R. S. Martins, Carlos O. Amorim, Vitor S. Amaral and Armando J. L. Pombeiro
Catalysts 2017, 7(7), 222; https://doi.org/10.3390/catal7070222 - 24 Jul 2017
Cited by 39 | Viewed by 5667
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 1–6 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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7570 KiB  
Article
Recyclable Fe3O4 Nanoparticles Catalysts for Aza-Michael Addition of Acryl Amides by Magnetic Field
by Zhen-Xing Li, Dan Luo, Ming-Ming Li, Xiao-Fei Xing, Zheng-Zheng Ma and Hao Xu
Catalysts 2017, 7(7), 219; https://doi.org/10.3390/catal7070219 - 20 Jul 2017
Cited by 25 | Viewed by 6733
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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1372 KiB  
Article
Dicyclopentadiene Hydroformylation to Value-Added Fine Chemicals over Magnetically Separable Fe3O4-Supported Co-Rh Bimetallic Catalysts: Effects of Cobalt Loading
by Yubo Ma, Jie Fu, Zhixian Gao, Libo Zhang, Chengyang Li and Tianfu Wang
Catalysts 2017, 7(4), 103; https://doi.org/10.3390/catal7040103 - 30 Mar 2017
Cited by 22 | Viewed by 5085
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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