Special Issue "Nanostructure Metal Alloys for the Transformation of Biomass"

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (30 June 2018)

Special Issue Editors

Guest Editor
Dr. Alberto Villa

Dipartimento di Chimica, Università degli Studi di Milano, Via Golgi 19, I-20133 Milano, Italy
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Interests: metal nanoparticles; heterogeneous catalysis; nanostructured metal oxides; functionalized carbons; metal carbides; biomass transformation
Guest Editor
Dr. Nikolaos Dimitratos

School of Chemistry, Cardiff Catalysis Institute, Cardiff University, Main Building, Park Place, Cardiff, Wales, CF10 3AT, UK
Website | E-Mail
Interests: Heterogeneous catalysis; Catalysis for energy; H2 production; CO2 transformation to methanol; supported metal nanoparticles; Heteropolyacids; Biomass conversion; Bifunctional catalysts, Size and shape control of metal colloids; In situ and operando spectroscopy; advanced characterisation using Synchrotron and Neutron techniques

Special Issue Information

Dear Colleagues,

This Special Issue will be devoted to the preparation, characterization and application of nanostructured metal alloy for the transformation of molecules derived from biomass, including glycerol, cellulosic and hemicellulose compounds, and lignin derived molecules.Metal nanoparticles have received a great deal of interest in the last decade because of their unique properties, finding potential applications in different fields, such us catalysis, electronics, optics, imaging, and biology. The superior performance of bimetallic systems compared to monometallic counterparts has been reported for different chemical reactions, including CO oxidation the selective oxidation of alcohols to aldehydes the direct synthesis of hydrogen peroxide the oxidation of primary C-H bonds and the transformation of biomass to fuel and chemical. The intrinsic properties of bimetallic particles have been shown to lead to catalytic properties different from monometallic counterparts, e.g., to enhanced activity, selectivity, and stability.

Dr. Alberto Villa
Dr. Nikolaos Dimitratos
Guest Editors

Manuscript Submission Information

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Keywords

  • bimetallic systems
  • characterization
  • oxidation
  • hydrogenation
  • glycerol
  • lignin
  • cellulose
  • hemicellulose

Published Papers (3 papers)

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Research

Open AccessArticle Supported Bimetallic AuPd Nanoparticles as a Catalyst for the Selective Hydrogenation of Nitroarenes
Nanomaterials 2018, 8(9), 690; https://doi.org/10.3390/nano8090690
Received: 5 August 2018 / Revised: 31 August 2018 / Accepted: 3 September 2018 / Published: 5 September 2018
PDF Full-text (1844 KB) | HTML Full-text | XML Full-text | Supplementary Files
Abstract
The solvent-free selective hydrogenation of nitrobenzene was carried out using a supported AuPd nanoparticles catalyst, prepared by the modified impregnation method (MIm), as efficient catalyst >99% yield of aniline (AN) was obtained after 15 h at 90 °C, 3 bar H
[...] Read more.
The solvent-free selective hydrogenation of nitrobenzene was carried out using a supported AuPd nanoparticles catalyst, prepared by the modified impregnation method (MIm), as efficient catalyst >99% yield of aniline (AN) was obtained after 15 h at 90 °C, 3 bar H2 that can be used without any further purification or separation, therefore reducing cost and energy input. Supported AuPd nanoparticles catalyst, prepared by MIm, was found to be active and stable even after four recycle experiments, whereas the same catalyst prepared by SIm was deactivated during the recycle experiments. The most effective catalyst was tested for the chemoselective hydrogenation of 4-chloronitrobenzene (CNB) to 4-chloroaniline (CAN). The activation energy of CNB to CAN was found to be 25 kJ mol−1, while that of CNB to AN was found to be 31 kJ mol−1. Based on this, the yield of CAN was maximized (92%) by the lowering the reaction temperature to 25 °C. Full article
(This article belongs to the Special Issue Nanostructure Metal Alloys for the Transformation of Biomass)
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Open AccessFeature PaperArticle Selective Oxidation of Veratryl Alcohol over Au-Pd/Ce0.62Zr0.38O2 Catalysts Synthesized by Sol-Immobilization: Effect of Au:Pd Molar Ratio
Nanomaterials 2018, 8(9), 669; https://doi.org/10.3390/nano8090669
Received: 16 July 2018 / Revised: 10 August 2018 / Accepted: 24 August 2018 / Published: 28 August 2018
PDF Full-text (2745 KB) | HTML Full-text | XML Full-text
Abstract
The selective oxidation of veratryl alcohol (VA), a model compound of lignin, with oxygen molecules to produce veratraldehyde (VAld) was studied over monometallic Au, Pd, and bimetallic Au:Pd nanoparticles supported on a Ce0.62Zr0.38O2 mixed oxide for the first
[...] Read more.
The selective oxidation of veratryl alcohol (VA), a model compound of lignin, with oxygen molecules to produce veratraldehyde (VAld) was studied over monometallic Au, Pd, and bimetallic Au:Pd nanoparticles supported on a Ce0.62Zr0.38O2 mixed oxide for the first time. These bimetallic Au-Pd catalysts with Au:Pd molar ratios from 0.4 to 4.3 were synthesized by the sol-immobilization method. Furthermore, all the catalysts were characterized by inductively coupled plasma-atomic emission spectroscopy (ICP-AES), N2 physisorption, X-ray photoelectron spectroscopy (XPS), scanning transmission electron microscopy-high angle annular dark field (STEM-HAADF) imaging, energy dispersive X-ray spectroscopy (EDXS), and temperature programmed reduction (TPR) techniques. A synergistic effect between gold and palladium was observed over all the bimetallic catalysts in a wide range of studied Au:Pd ratios. Remarkably, the optimum Au:Pd ratio for this reaction was 1.4 with a turnover frequency of almost six times larger than for the monometallic gold and palladium catalysts. Selectivity to veratraldehyde was higher than 99% for the monometallic Au, Pd, and all the bimetallic Au-Pd catalysts, and stayed constant during the reaction time. Full article
(This article belongs to the Special Issue Nanostructure Metal Alloys for the Transformation of Biomass)
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Graphical abstract

Open AccessArticle Photoinduced Glycerol Oxidation over Plasmonic Au and AuM (M = Pt, Pd and Bi) Nanoparticle-Decorated TiO2 Photocatalysts
Nanomaterials 2018, 8(4), 269; https://doi.org/10.3390/nano8040269
Received: 26 March 2018 / Revised: 14 April 2018 / Accepted: 19 April 2018 / Published: 23 April 2018
Cited by 1 | PDF Full-text (5458 KB) | HTML Full-text | XML Full-text
Abstract
In this study, sol-immobilization was used to prepare gold nanoparticle (Au NP)-decorated titanium dioxide (TiO2) photocatalysts at different Au weight % (wt. %) loading (Aux/TiO2, where x is the Au wt. %) and Au–M NP-decorated TiO2
[...] Read more.
In this study, sol-immobilization was used to prepare gold nanoparticle (Au NP)-decorated titanium dioxide (TiO2) photocatalysts at different Au weight % (wt. %) loading (Aux/TiO2, where x is the Au wt. %) and Au–M NP-decorated TiO2 photocatalysts (Au3M3/TiO2), where M is bismuth (Bi), platinum (Pt) or palladium (Pd) at 3 wt. %. The Aux/TiO2 photocatalysts exhibited a stronger visible light absorption than the parent TiO2 due to the localized surface plasmon resonance effect. Increasing the Au content from 1 wt. % to 7 wt. % led to increased visible light absorption due to the increasing presence of defective structures that were capable of enhancing the photocatalytic activity of the as-prepared catalyst. The addition of Pt and Pd coupled with the Au3/TiO2 to form Au3M3/TiO2 improved the photocatalytic activity of the Au3/TiO2 photocatalyst by maximizing their light-absorption property. The Au3/TiO2, Au3Pt3/TiO2 and Au3Pd3/TiO2 photocatalysts promoted the formation of glyceraldehyde from glycerol as the principle product, while Au3Bi3/TiO2 facilitated glycolaldehyde formation as the major product. Among all the prepared photocatalysts, Au3Pd3/TiO2 exhibited the highest photocatalytic activity with a 98.75% glycerol conversion at 24 h of reaction time. Full article
(This article belongs to the Special Issue Nanostructure Metal Alloys for the Transformation of Biomass)
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Graphical abstract

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