Special Issue "Mono- and Bimetallic Nanoparticles in Catalysis"

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

Deadline for manuscript submissions: closed (31 July 2022) | Viewed by 5115

Special Issue Editors

Dr. Olga A. Kirichenko
E-Mail Website
Guest Editor
Chemical Engineering Department, M.V. Lomonosov Institute of Fine Chemical Technologies, Russian Technological University MIREA, Moscow, Russia
Interests: heterogeneous catalysis; scientific basics for the catalyst preparation; catalyst design and engineering; inorganic materials; nanocatalysts and nanomaterials
Dr. Elena A. Redina
E-Mail Website
Guest Editor
Laboratory of development of the polyfunctional catalysts, N.D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, Russia
Interests: catalysis in organic synthesis; green chemistry; catalyst synthesis and development; bimetallic catalysts; selective oxidation; selective hydrogenation; catalysis by gold
Dr. Anastasiya A. Shesterkina
E-Mail Website
Guest Editor
Laboratory of nanochemistry and ecology, National University of Science and Technology MISiS, Moscow, Russia
Interests: selective hydrogenation; bimetallic nanoparticles; heterogeneous Fe-containing catalysts; catalysis in organic synthesis; green chemistry; catalyst synthesis and development

Special Issue Information

Dear Colleagues,

Catalysts based on mono- and bimetallic nanoparticles have been used at laboratory, pilot-plant, and industrial scale for several years. Nevertheless, they are still of considerable interest due to the discovery of the new compositions and structures bearing unknown and unique catalytic properties. Other reasons include changes in major trends in chemical engineering, process safety, and cost, as well as the appearance of new renewable raw materials and the need for novel up-to-date chemical products.

This Special Issue will provide information on recent advances in the synthesis of mono- and bimetallic nanoparticles for applications in the catalytic processes, as well as studies on the structure of nanoparticles and their catalytic behavior. We welcome papers focusing on novel synthesis methods of metallic nanoparticles for the diverse applications in catalysis, especially in novel promising reactions and processes. Variations in procedures of known methods that result in strong improvement of the catalytic properties are of interest as well. Studies of the systems “no noble metal – support” and “noble metal – no noble metal – support”, as well as the use of metal oxide combinations as supports or supported phases, are of particular interest. We encourage the submission of all types of papers, including communications, research, and review papers, that cover all topics of innovative catalytic applications of mono- and bi-metallic nanoparticles.

Dr. Olga A. Kirichenko
Dr. Elena A. Redina
Dr. Anastasiya A. Shesterkina
Guest Editors

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 2200 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

  • Synthesis of metallic nanoparticles
  • Supported nanocatalysts
  • Preparation of nanocatalysts
  • Design of bimetallic nanoparticles
  • Stabilization of metallic nanoparticles
  • Selective hydrogenation
  • Selective oxidation
  • Large scale products
  • Green chemistry
  • Heterogeneous catalysis in organic synthesis

Published Papers (6 papers)

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Research

Article
Electro-Catalytic Properties of Palladium and Palladium Alloy Electro-Catalysts Supported on Carbon Nanofibers for Electro-Oxidation of Methanol and Ethanol in Alkaline Medium
Catalysts 2022, 12(6), 608; https://doi.org/10.3390/catal12060608 - 02 Jun 2022
Viewed by 467
Abstract
Carbon nanofibers (CNFs) supported by Pd and Pd-Sn electro-catalysts were prepared by the chemical reduction method using ethylene glycol as the reducing agent. Their physicochemical characteristics were studied using high resolution-transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray [...] Read more.
Carbon nanofibers (CNFs) supported by Pd and Pd-Sn electro-catalysts were prepared by the chemical reduction method using ethylene glycol as the reducing agent. Their physicochemical characteristics were studied using high resolution-transmission electron microscopy (HR-TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA) and Bruanaer-Emmett-Teller (BET) analysis. FTIR revealed that oxygen, hydroxyl, carboxylic and carbonyl functional groups facilitated the dispersion of Pd and Sn nanoparticles. The doping of Pd with Sn to generate PdSn alloy was also confirmed by XPS data. The amorphous nature of CNFs was confirmed by XRD patterns which exhibited the Pd diffraction peaks. When Sn was added to Pd/CNFs, the diffraction peaks moved to lower angles. HRTEM images revealed that the CNFs with cylindrical shape-like morphology and also Pd-Sn nanoparticles dispersed on carbon support. The catalytic activity and stability towards alcohol electro-oxidation in alkaline medium at room temperature was evaluated using cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS). The obtained Pd-Sn/CNFs electro-catalyst exhibited a better electro-catalytic activity than Pd/CNFs and Pd/C electro-catalysts for both methanol and ethanol oxidation. The improvement of the electrochemical performance was associated with the synergistic effect via the addition of Sn which modified the Pd atom arrangement, thereby promoting oxidation through a dehydrogenation pathway. Furthermore, SnO2 generates abundant OH species which helps with increasing the rate of the oxidative removal of carbon monoxide (CO) intermediates from Pd sites. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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Article
Atomic Structure of Pd-, Pt-, and PdPt-Based Catalysts of Total Oxidation of Methane: In Situ EXAFS Study
Catalysts 2021, 11(12), 1446; https://doi.org/10.3390/catal11121446 - 27 Nov 2021
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Abstract
In this study, 3%Pd/Al2O3, 3%Pt/Al2O3 and bimetallic (1%Pd + 2%Pt)/Al2O3 catalysts were examined in the total oxidation of methane in a temperature range of 150–400 °C. The evolution of the active component under [...] Read more.
In this study, 3%Pd/Al2O3, 3%Pt/Al2O3 and bimetallic (1%Pd + 2%Pt)/Al2O3 catalysts were examined in the total oxidation of methane in a temperature range of 150–400 °C. The evolution of the active component under the reaction conditions was studied by transmission electron microscopy and in situ extended X-ray absorption fine structure (EXAFS) spectroscopy. It was found that the platinum and bimetallic palladium-platinum catalysts are more stable against sintering than the palladium catalysts. For all the catalysts, the active component forms a “core-shell” structure in which the metallic core is covered by an oxide shell. The “core-shell” structure for the platinum and bimetallic palladium-platinum catalysts is stable in the temperature range of 150–400 °C. However, in the case of the palladium catalysts the metallic core undergoes the reversible oxidation at temperatures above 300 °C and reduced to the metallic state with the decrease in the reaction temperature. The scheme of the active component evolution during the oxidation of methane is proposed and discussed. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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Article
Local Structure of Pd1 Single Sites on the Surface of PdIn Intermetallic Nanoparticles: A Combined DFT and CO-DRIFTS Study
Catalysts 2021, 11(11), 1376; https://doi.org/10.3390/catal11111376 - 15 Nov 2021
Viewed by 622
Abstract
Local structure of Pd1 single sites on the surface of Pd1In1 intermetallic nanoparticles supported on α-Al2O3 was investigated by the combination of CO-DRIFTS spectroscopy and DFT. CO-DRIFTS spectra of PdIn/Al2O3 catalyst exhibit only [...] Read more.
Local structure of Pd1 single sites on the surface of Pd1In1 intermetallic nanoparticles supported on α-Al2O3 was investigated by the combination of CO-DRIFTS spectroscopy and DFT. CO-DRIFTS spectra of PdIn/Al2O3 catalyst exhibit only one asymmetric absorption band of linearly adsorbed CO comprising two peaks at 2065 and 2055 cm−1 attributable to CO molecules coordinated to Pd1 sites located at (110) and (111) facets of PdIn nanoparticles. The absence of bridged or hollow-bonded CO bands indicates that multipoint adsorption on PdIn nanoparticles is significantly hindered or impossible. DFT results show that on (110) facet multipoint CO adsorption is hindered due to large distance between neighboring Pd atoms (3.35 Å). On (111) facet multipoint CO adsorption on surface palladium atoms is impossible, since adjacent Pd atoms are located below the surface plane. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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Article
An Investigation into the Bulk and Surface Phase Transformations of Bimetallic Pd-In/Al2O3 Catalyst during Reductive and Oxidative Treatments In Situ
Catalysts 2021, 11(7), 859; https://doi.org/10.3390/catal11070859 - 18 Jul 2021
Cited by 2 | Viewed by 969
Abstract
A series of oxidative treatments of PdIn-supported intermetallic nanoparticles at different temperatures were performed. The bulk and surface structure of catalyst during phase transformation was investigated by bulk- and surface-sensitive techniques (in situ XAFS, DRIFTS of adsorbed CO). It was found that comparison [...] Read more.
A series of oxidative treatments of PdIn-supported intermetallic nanoparticles at different temperatures were performed. The bulk and surface structure of catalyst during phase transformation was investigated by bulk- and surface-sensitive techniques (in situ XAFS, DRIFTS of adsorbed CO). It was found that comparison of palladium and indium fractions in bulk and on the surface suggests the formation of a «core-shell» structure. According to obtained results, the core consists of In-depleted intermetallic compound or inhomogeneous bimetallic phase with the inner core of metallic Pd, when a mixture of indium oxide, metallic palladium and small part of PdIn is present on the surface. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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Article
CuO-Fe2O3 Nanoparticles Supported on SiO2 and Al2O3 for Selective Hydrogenation of 2-Methyl-3-Butyn-2-ol
Catalysts 2021, 11(5), 625; https://doi.org/10.3390/catal11050625 - 12 May 2021
Cited by 1 | Viewed by 831
Abstract
In this study, novel SiO2- and Al2O3-supported Cu-Fe catalysts are developed for selective hydrogenation of 2-methyl-3-butyne-2-ol to 2-methyl-3-butene-2-ol under mild reaction conditions. TEM, XRD, and FTIR studies of adsorbed CO and TPR-H2 are performed to characterize [...] Read more.
In this study, novel SiO2- and Al2O3-supported Cu-Fe catalysts are developed for selective hydrogenation of 2-methyl-3-butyne-2-ol to 2-methyl-3-butene-2-ol under mild reaction conditions. TEM, XRD, and FTIR studies of adsorbed CO and TPR-H2 are performed to characterize the morphology, nanoparticle size, and particle distribution, as well as electronic state of deposited metals in the prepared catalysts. The deposition of Fe and Cu metal particles on the aluminum oxide carrier results in the formation of a mixed oxide phase with a strong interaction between the Fe and Cu precursors during the calcination. The highly dispersed nanoparticles of Fe2O3 and partially reduced CuOx, with an average size of 3.5 nm and with strong contact interactions between the metals in 5Cu-5Fe/Al2O3 catalysts, provide a high selectivity of 93% toward 2-methyl-3-butene-2-ol at complete conversion of the unsaturated alcohol. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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Article
Facile Redox Synthesis of Novel Bimetallic Crn+/Pd0 Nanoparticles Supported on SiO2 and TiO2 for Catalytic Selective Hydrogenation with Molecular Hydrogen
Catalysts 2021, 11(5), 583; https://doi.org/10.3390/catal11050583 - 30 Apr 2021
Cited by 1 | Viewed by 665
Abstract
The bimetallic Crn+/Pd0 nanoparticles have been synthesized for the first time by a two-step redox method. The method includes the deposition of Pd0 nanoparticles on the surface of SiO2 and TiO2 carriers followed by the deposition of [...] Read more.
The bimetallic Crn+/Pd0 nanoparticles have been synthesized for the first time by a two-step redox method. The method includes the deposition of Pd0 nanoparticles on the surface of SiO2 and TiO2 carriers followed by the deposition of Crn+ on the surface of Pd0 nanoparticles using the redox procedures, which are based on the catalytic reduction of Crn+ with H2 in aqueous suspensions at ambient conditions. Transmission (TEM) and scanning (SEM) electron microscopy, X-ray photoelectron spectroscopy (XPS), Fourie-transformed infrared spectroscopy of adsorbed CO (FTIR-CO), and CO chemisorption studies were performed to characterize the morphology, nanoparticle size, element, and particle distribution, as well as the electronic state of deposited metals in the obtained catalysts. A decrease in nanoparticle size from 22 nm (Pd/SiO2) to 2–6 nm (Pd/TiO2) makes possible deposition of up to 1.1 wt.% Cr most likely as Cr3+. The deposition of CrOx species on the surface of Pd nanoparticles was confirmed using FTIR of adsorbed CO and the method of temperature-programmed reduction with hydrogen (TPR-H2). The intensive hydrogen consumption in the temperature ranges from −50 °C to 40 °C (Cr/Pd/SiO2) and from −90 °C to −40 °C (Cr/Pd/TiO2) was first observed for the supported Pd catalysts. The decrease in the temperature of β-PdHx decomposition indicates the strong interaction between the deposited Crn+ species and Pd0 nanoparticle after reduction with H2 at 500 °C. The novel Crn+/Pd/TiO2 catalysts demonstrated a considerably higher activity in selective hydrogenation of phenylacetylene than the Pd/TiO2 catalyst at ambient conditions. Full article
(This article belongs to the Special Issue Mono- and Bimetallic Nanoparticles in Catalysis)
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