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Applied Sciences
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Au-Pd and Au-Pt NPs and Alloys for Catalytic and Electrocatalytic...
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Au-Pd and Au-Pt NPs and Alloys for Catalytic and Electrocatalytic Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Materials Science and Engineering".

Deadline for manuscript submissions: closed (31 December 2019) | Viewed by 8461

Special Issue Editors

Dr. Leonarda Francesca Liotta

E-Mail Website
Guest Editor
Istituto per lo Studio dei Materiali Nanostrutturati(ISMN)-CNR via Ugo La Malfa, 153 90146 Palermo, Italy
Interests: Au catalysts supported on reducible oxides: synthesis, investigation of structure-activity relationship, application in CO, PROX, VOC oxidation; Noble metals (Pd, Pt, Rh) and perovskite catalysts for environmental depollution, especially for after-treatment of exhausts gases emitted by vehicles and ships in compliance with IMO 2020 regulations; Ni-based catalysts for syngas production and CH4/CO2 activation, Dry reforming reactions; LSCF and Pd/Ni LSCF doped oxides as cathodes for SOFCs, and as photo-catalysts for pollutants abatement; Conversion of oils and fats to biodiesel over solid acid catalysts
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Tatyana Tabakova

E-Mail Website
Guest Editor
Institute of Catalysis – Bulgarian Academy of Sciences, Sofia, Bulgaria
Interests: scientific bases for preparation and selection of heterogeneous catalysts; synthesis, characterization and application of nanosized gold catalysts; relation between structure and catalytic activity; catalysis for environmental protection–hydrogen production via WGSR and PROX, CO and VOCs oxidation

Special Issue Information

Dear Colleagues,

Bimetallic nanoparticles (NPs) have received considerable attention for their unique optical, magnetic, electrical and catalytic properties, which are very different from those of their monometallic NP components and which are dependent on their morphology and composition. Gold is very useful as an alloying metal due to its relatively low reactivity and it has been successfully used in conjunction with metals, such as palladium and platinum, as a catalyst and electrocatalyst. Au-Pd and Au-Pt bimetallic systems are attractive systems in low temperature CO and VOCs oxidation, PROX reaction, N2O decomposition, vinyl acetate monomer synthesis, hydrodechlorination of CClF2, hydrogenation of hydrocarbon, cyclotrimerization of acetylene, direct synthesis of hydrogen peroxide and so forth. Moreover, Au-Pd and Au-Pt have shown enhanced electrocatalytic activity in oxygen reduction reactions (ORR) and as well in the electroxidation of methanol and reduction of 2-nitrophenol.

The structure of bimetallic combinations depends mainly on the preparation conditions and miscibility of the two components and therefore on the Au/Pd or Au/Pt ratio. Au–Pd and Au–Pt have been reported to exhibit a core–shell structure or an alloy phase depending on the preparation method. Proper characterization techniques, such as FT-IR, Raman, HR-TEM, XRD, XPS along with density functional theory (DFT)-based mechanistic studies, may elucidate whether the Au and Pd/Pt components are chemically segregated or intimately alloyed in the synthesized NPs, providing a fundamental understanding of their reactivity.

Based on the wide range of investigation and application of bimetallic Au-Pd and Au-Pt NPs, the present Special Issue aims to cover recent research progress, both theoretical and experimental, in the field of Au-Pd and Au-Pt alloys.

We invite you to submit your research in the form of original research papers, mini-reviews and perspective articles.

Dr. Leonarda Francesca Liotta
Prof. Dr. Tatyana Tabakova
Guest Editors

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. Applied Sciences is an international peer-reviewed open access semimonthly 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 2400 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

  • Au-Pd
  • Au-Pt
  • nanoparticles
  • alloys
  • heterogeneous catalysis
  • electrocatalysis
  • advanced synthesis routes
  • physicochemical–textural-structural characterizations
  • structure–activity relationships
  • computational studies

Published Papers (3 papers)

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Research

12 pages, 3014 KiB  
Article
Effect of Precious Metals on NO Reduction by CO in Oxidative Conditions
by Joudia Akil, Stéphane Siffert, Pirault-Roy Laurence, Damien P. Debecker, François Devred, Renaud Cousin and Christophe Poupin
Appl. Sci. 2020, 10(9), 3042; https://doi.org/10.3390/app10093042 - 27 Apr 2020
Cited by 4 | Viewed by 2316
Abstract
Carbon dioxide has become an environmental challenge, where the emissions have reached higher level than can be handled. In this regard, conversion of CO2 to value-added chemicals and thus recycling of CO2 appear a viable option. Prior to valorization, CO2 [...] Read more.
Carbon dioxide has become an environmental challenge, where the emissions have reached higher level than can be handled. In this regard, conversion of CO2 to value-added chemicals and thus recycling of CO2 appear a viable option. Prior to valorization, CO2 must be purified. Among several opportunities, oxyfuel combustion is a process in rapid development. However, the gases resulting from this process contain some traces of impurities that can hinder the recovery of CO2 such as NO and CO. This work has, therefore, focused on the study of the NO-CO reaction in an oxidizing medium, using heterogeneous catalytic materials based on various supported noble metals. These materials were extensively characterized by a variety of methods including Brunauer–Emmett–Teller (BET) surface area measurements, hydrogen chemisorption, transmission electron microscopy (TEM) and H2 temperature programmed reduction (H2-TPR). The results obtained show that the catalytic behavior of M/Al2O3 catalysts in CO oxidation and NO reduction with CO in oxidative conditions depends mainly on the nature of the metal. The best result for both reactions is obtained with Pt/Al2O3 catalyst. The Pt nanoparticles in their metallic form (Pt°) as evidenced by TPR could explain the activity. Full article
(This article belongs to the Special Issue Au-Pd and Au-Pt NPs and Alloys for Catalytic and Electrocatalytic Applications)
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17 pages, 2158 KiB  
Article
Complete Benzene Oxidation over Mono and Bimetallic Pd—Au Catalysts on Alumina-Supported Y-Doped Ceria
by Tatyana Tabakova, Lyuba Ilieva, Petya Petrova, Anna Maria Venezia, Yordanka Karakirova, Leonarda Francesca Liotta and Georgi Avdeev
Appl. Sci. 2020, 10(3), 1088; https://doi.org/10.3390/app10031088 - 06 Feb 2020
Cited by 6 | Viewed by 1981
Abstract
The protection of environment and human health stimulates intensive research for abatement of volatile organic compounds (VOCs) in the atmosphere. Complete catalytic oxidation is an efficient, environmentally friendly and economically feasible method for elimination of VOCs. This study aims to design high performing [...] Read more.
The protection of environment and human health stimulates intensive research for abatement of volatile organic compounds (VOCs) in the atmosphere. Complete catalytic oxidation is an efficient, environmentally friendly and economically feasible method for elimination of VOCs. This study aims to design high performing and cost-effective catalytic formulations by exploration of appropriate and economically viable supports. Alumina-supported ceria (30 wt.%) and Y2O3 (1 wt.%)-doped ceria were prepared by mechanical mixing and were used as support of mono Au (2 wt.%) and Pd (1 wt.%) and bimetallic Pd-Au catalysts. The characterization by textural measurements, X-ray powder diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), EPR (electron paramagnetic resonance) and temperature-programmed reduction (TPR) was carried out in order to clarify the relationship between catalyst composition, textural, structural and surface properties, reducibility and catalytic performance for complete benzene oxidation. Among all studied catalysts, Pd-based catalysts exhibited the best combustion activity. In particular, monometallic Pd on alumina supported Y-doped ceria attained 100% of complete benzene conversion at 180 °C. These catalytic materials have potential to meet stringent emission regulations in an economical and effective way. Full article
(This article belongs to the Special Issue Au-Pd and Au-Pt NPs and Alloys for Catalytic and Electrocatalytic Applications)
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13 pages, 2444 KiB  
Article
Relative Stability of Small Silver, Platinum, and Palladium Doped Gold Cluster Cations
by Piero Ferrari and Ewald Janssens
Appl. Sci. 2019, 9(8), 1666; https://doi.org/10.3390/app9081666 - 23 Apr 2019
Cited by 7 | Viewed by 3452
Abstract
The stability patterns of single silver, platinum, and palladium atom doped gold cluster cations, MAuN−1+ (M = Ag, Pt, Pd; N = 3–6), are investigated by a combination of photofragmentation experiments and density functional theory calculations. The mass [...] Read more.
The stability patterns of single silver, platinum, and palladium atom doped gold cluster cations, MAuN−1+ (M = Ag, Pt, Pd; N = 3–6), are investigated by a combination of photofragmentation experiments and density functional theory calculations. The mass spectra of the photofragmented clusters reveal an odd-even pattern in the abundances of AgAuN−1+, with local maxima for clusters containing an even number of valence electrons, similarly to pure AuN+. The odd-even pattern, however, disappears upon Pt and Pd doping. Computed dissociation energies agree well with the experimental findings for the different doped clusters. The effect of Ag, Pt, and Pd doping is discussed on the basis of an analysis of the density of states of the N = 3–5 clusters. Whereas Ag delocalizes its 5s valence electron in all sizes, this process is size-specific for Pt and Pd. Full article
(This article belongs to the Special Issue Au-Pd and Au-Pt NPs and Alloys for Catalytic and Electrocatalytic Applications)
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