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Catalysts
Special Issues
Catalytic Processes of Bimetallic Nanoparticles
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Catalytic Processes of Bimetallic Nanoparticles

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

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 4508

Special Issue Editors

Dr. Marta Stucchi

E-Mail Website
Guest Editor
Chemistry Department, University of Milan, Via Golgi 19, 20133 Milan, Italy
Interests: heterogeneous catalysis in liquid-phase; metal nanoparticles for catalysis; explore the properties of non-noble metals for catalysis; NMR relaxometry to study the interaction between substrate and catalyst surfaces; hydrogenation/hydrogenolysis for biomass valorization; oxidation process of biomass derived molecules for biochemical production
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Laura Prati

E-Mail Website
Guest Editor
Department of Chemistry, Università degli Studi di Milano, 20122 Milan, Italy
Interests: environmental catalytic processes; selective oxidation of organic compounds; gold-based catalysts; metal nanoparticles synthesis; nano-materials synthesis and characterization; carbon-based catalysts; biomass valorization; catalytic sustainable processes

Special Issue Information

Dear Colleagues,

Gold-based catalysts have been the subject of intensive research interest since the inspiring discovery of the high activity of gold nanoparticles (NPs) for CO oxidation. Supported gold NPs have shown promising catalytic performance for a variety of reactions, including propene oxidation, water–gas shift reaction, selective oxidation of alcohols, selective hydrogenation of unsaturated aldehydes, and elimination of volatile organic compounds. Moreover, due to their surface plasmon resonance, supported gold nanoparticles exhibit photocatalytic activity for hydrogen production, environmental pollution control, low-temperature catalytic combustion, and reduction of nitrogen oxides, with the advantage of being active in visible light.  Most recently, gold bimetallic nanocatalysts have attracted much interest, with the aim of improving activity, selectivity, and durability. In fact, nanoparticles composed of two different metal elements show novel electronic, optical, catalytic, or photocatalytic properties compared to monometallic ones, showing not only the combination of the properties in relation to the presence of two individual metals but also new properties due to a synergy between two metals.

The structure of bimetallic nanoparticles can be oriented in random alloy, alloy with an intermetallic compound, cluster-in-cluster, or core–shell, and it is strictly dependent on the preparation methods and conditions. The structure affects the physicochemical properties of the resulting nanomaterial, hence a thorough characterization is crucial. 

This Special Issue is dedicated to the synergistic effect in gold bimetallic NPs, for both catalytic and photocatalytic processes. It focuses on the potential of Au bimetallic systems and their applications for different aims, with particular attention to green and sustainable processes, environmental chemistry, and energy production. Reviews and original research papers are invited from fundamental to industrial applications on Au bimetallic structures where the synergistic effect plays a crucial role in enhancing the overall process. 

Dr. Marta Stucchi
Prof. Dr. Laura Prati
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. 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

  • synergistic effect—theoretical aspects
  • synergistic effect—practical aspects
  • gold-based bimetallic catalysts
  • gold-based bimetallic photocatalysts
  • sustainable processes
  • biomass valorization
  • hydrogen production
  • sustainable energy
  • water treatment
  • pollution abatement
  • solar-driven processes
  • bimetallic nanoparticles synthesis
  • bimetallic nanoparticles characterization
  • structure–activity relationship

Published Papers (2 papers)

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Research

17 pages, 4638 KiB  
Article
Noble Metal Promoted TiO2 from Silver-Waste Valorisation: Synergism between Ag and Au
by Marta Stucchi, Daniela Meroni, György Safran, Alberto Villa, Claudia L. Bianchi and Laura Prati
Catalysts 2022, 12(2), 235; https://doi.org/10.3390/catal12020235 - 19 Feb 2022
Cited by 5 | Viewed by 1798
Abstract
Wastewaters from precious metal industries contain high amounts of noble metals, but their efficient recycling is hindered by the wastewater complex composition. Here, we propose an innovative approach for the efficient recovery of noble metals contained in these metal-enriched wastewaters as precursors for [...] Read more.
Wastewaters from precious metal industries contain high amounts of noble metals, but their efficient recycling is hindered by the wastewater complex composition. Here, we propose an innovative approach for the efficient recovery of noble metals contained in these metal-enriched wastewaters as precursors for the synthesis of noble metal nanoparticles (NPs) and supported metal catalysts. Silver NPs were synthesized from Ag-enriched wastewater and then deposited on TiO2 to prepare photocatalysts. Then, further promotion of the photocatalytic activity of Ag-modified TiO2 was achieved by the addition of as little as 0.5 wt.% of Au. STEM-EDS analyses proved that Au NPs were located on Ag or AgOx nanoparticles. The contact between the two metal-containing NPs results in charge transfer effects, appreciable both in terms of oxidation states determined by XPS and of optical properties. In particular, the plasmon band of Au NPs shows photochromic effects: under UV light irradiation, bimetallic samples exhibit a blue-shift of the plasmon band, which is reversible under dark storage. The activity of the materials was tested towards ethanol photodegradation under UV light. Adding 0.5 wt.% Au NPs resulted in a promoted activity compared to Ag-TiO2, thus showing synergistic effects between Au and Ag. Ethanol was completely converted already after 1 h of UV irradiation, acetaldehyde was formed as the main oxidation product and fully degraded in less than 180 min. Notably, bimetallic samples showed ethylene formation by a parallel dehydration mechanism. Full article
(This article belongs to the Special Issue Catalytic Processes of Bimetallic Nanoparticles)
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19 pages, 8122 KiB  
Article
Bimetallic Co-Rh Systems as a Prospective Base for Design of CH4 Reforming Catalysts to Produce Syngas with a Controllable Composition
by Sholpan S. Itkulova, Kirill A. Valishevskiy and Yerzhan A. Boleubayev
Catalysts 2022, 12(1), 105; https://doi.org/10.3390/catal12010105 - 17 Jan 2022
Cited by 4 | Viewed by 1861
Abstract
Dry and bireforming (CO2-H2O) of methane are the most environmentally friendly routes involving two main greenhouse gases to produce syngas—an important building block for large-scale production of various commodity chemicals. The main drawback preventing their industrial application is the [...] Read more.
Dry and bireforming (CO2-H2O) of methane are the most environmentally friendly routes involving two main greenhouse gases to produce syngas—an important building block for large-scale production of various commodity chemicals. The main drawback preventing their industrial application is the coke formation. Developing catalysts that do not favour or are resistant to coke formation is the only way to improve the catalyst stability. Designing an economically viable catalyst may be achieved by exploiting the synergic effects of combining noble (expensive but coke-resistant) and non-noble (cheap but prone to carbonisation) metals to form highly effective catalysts. This work deals with development of highly active and stable bimetallic Co-containing catalysts modified with small amount of Rh, 0.1–0.5 mass %. The catalysts were characterised by BET, XRD, TEM, SEM, XPS, and TPR-H2 methods and tested in dry, bi-, and for comparison in steam reforming of methane. It was revealed that the bimetallic Co-Rh systems is much more effective than monometallic ones due to Co-Rh interaction accompanied with increasing dispersion and reducibility of Co. The extents of CH4 and CO2 conversion over the 5%Co-Rh/Al2O3 are varied within 85–99%. Syngas with variable H2/CO = 0.9–3.9 was formed. No loss of activity was observed for 100 h of long-term stability test. Full article
(This article belongs to the Special Issue Catalytic Processes of Bimetallic Nanoparticles)
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