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Catalysts
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Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application
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Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application

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

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 10313

Special Issue Editor

Dr. Weijian Diao

E-Mail Website
Guest Editor
College of Engineering, Villanova University, Villanova, USA
Interests: Heterogeneous catalysis; Bimetallic catalysts; Nanomaterials; Rational catalyst synthesis; Renewable energy

Special Issue Information

Dear Colleagues,

Supported metal catalysts have been the workhorse of the chemical industry since the observation by Davy in 1817 that a Pt wire functioned as a combustion catalyst. Many studies have been conducted to modify and improve the properties and utilization of these supported metals by changing particle sizes, changing the morphologies of the metal particles, changing the supports of the metal nanoparticles to introduce metal-support effects, and using geometrical-constrained supports such as zeolites to restrict access to certain feed substrates. However, another way of creating better-performing catalysts is through the addition of a secondary metal. Bimetallic catalysts can dramatically change performance via one or more of the following three options: (1) ensemble or geometric effects, (2) electronic or so-called ligand effects, and (3) bifunctional effects.

In this Special Issue, we focus on the synthesis, characterization, evaluation, and application of novel bimetallic catalysts. The Special Issue aims to cover recent progresses and trends in rational synthesis methods and comprehensive characterization for bimetallic catalysts. Novel synthesis methods include but are not limited to deposition-precipitation, strong electrostatic adsorption (SEA), galvanic displacement, and electroless deposition/plating. Comprehensive characterization includes but is not limited to chemisorption, temperature-programmed reduction/oxidation, X-ray photoelectron spectroscopy, in situ and operando spectroscopy, EXAFS, and XANES.  The aim and scope of this Special Issue also includes evaluation and application for bimetallic catalysts, such as selective hydrogenation/oxidation reactions, dehydrogenation reactions, CO2 conversion, emission control reactions, fuel cell, and electrochemical applications.

Submit your paper and select the Journal “Catalysts” and the Special Issue “Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application” via: MDPI submission system. Please contact the Guest Editor or the journal editor ([email protected]) for any queries. Our papers will be published on a rolling basis and we will be pleased to receive your submission once you have finished it.

Dr. Weijian Diao
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

  • Bimetallic catalysts
  • Rational catalyst synthesis
  • Bimetallic catalyst characterization
  • Strong metal–metal interaction
  • Bifunctional catalysts
  • Bimetallic catalyst application

Published Papers (5 papers)

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Research

19 pages, 4171 KiB  
Article
Synthesis of Oxygenated Hydrocarbons from Ethanol over Sulfided KCoMo-Based Catalysts: Influence of Novel Fiber- and Powder-Activated Carbon Supports
by Tshepo D. Dipheko, Vladimir V. Maximov, Mohamed E. Osman, Oleg L. Eliseev, Alexander G. Cherednichenko, Tatiana F. Sheshko and Victor M. Kogan
Catalysts 2022, 12(12), 1497; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12121497 - 23 Nov 2022
Cited by 3 | Viewed by 1117
Abstract
Ethanol has become a viable feedstock for basic organic synthesis. The catalytic conversion of ethanol provides access to such chemicals as diethyl ether, ethyl acetate, and acetaldehyde. Carbonaceous materials are extensively studied as supports for heterogeneous catalysts due to their chemical and thermal [...] Read more.
Ethanol has become a viable feedstock for basic organic synthesis. The catalytic conversion of ethanol provides access to such chemicals as diethyl ether, ethyl acetate, and acetaldehyde. Carbonaceous materials are extensively studied as supports for heterogeneous catalysts due to their chemical and thermal stability, high surface area, and tunable texture. In this paper, ethanol conversion over K10Co3.7Mo12S-catalysts supported on novel activated carbon (AC) materials (i.e., novel powder-AC (DAS and YPK-1), fiber non-woven AC material (AHM), and fabric active sorption (TCA)) was investigated. The catalysts were prepared by the incipient wetness co-impregnation method followed by sulfidation. The catalysts were characterized by employing N2 adsorption–desorption measurements, TEM, SEM/EDX, UV–Vis spectroscopy, and XRF. Catalytic performance was assessed in a fixed-bed down-flow reactor operating at 320 °C, 2.5 MPa, and with continuous ethanol feeding in an He atmosphere. Activity is highly dependent on the support type and catalyst’s textural properties. The activity of the fiber-supported catalysts was found to be greater than the powder-supported catalysts. Ethanol conversion at T = 320 °C, P = 2.5 MPa, and GHSV = 760 L h−1 kgcat−1 increased as follows: (38.7%) KCoMoS2/YPK-1 < (49.5%) KCoMoS2/DAS < (58.2%) KCoMoS2/TCA < (67.1%) KCoMoS2/AHM. Catalysts supported by powder-AC enhanced the formation of MoS2-crystallites, whereas the high acidity of fiber-AC seemed to inhibit the formation of MoS2-crystallites. Simultaneously, a high surface area and a microporous catalytic structure enhance the formation of oxygenates from hydrocarbons. The dehydration and dehydrogenation reactions, which led to the creation of ethene and acetaldehyde, were shown to require a highly acidic catalyst, while the synthesis of ethyl acetate and higher alcohols required a less acidic catalyst. Full article
(This article belongs to the Special Issue Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application)
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15 pages, 5480 KiB  
Article
Liquid-Phase Selective Hydrogenation of Furfural to Furfuryl Alcohol over Ferromagnetic Element (Fe, Co, Ni, Nd)-Promoted Pt Catalysts Supported on Activated Carbon
by Sureeporn Saknaphawuth, Patcharaporn Weerachawanasak, Laemthong Chuenchom, Piyasan Praserthdam and Joongjai Panpranot
Catalysts 2022, 12(4), 393; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12040393 - 31 Mar 2022
Cited by 1 | Viewed by 2408
Abstract
Ferromagnetic element (x = Fe, Co, Ni, and Nd)-promoted Pt/AC catalysts were prepared by co-impregnation method or physical mixing and tested in the liquid-phase hydrogenation of furfural to furfuryl alcohol (FA) under mild conditions (50 °C and 20 bar H2) using [...] Read more.
Ferromagnetic element (x = Fe, Co, Ni, and Nd)-promoted Pt/AC catalysts were prepared by co-impregnation method or physical mixing and tested in the liquid-phase hydrogenation of furfural to furfuryl alcohol (FA) under mild conditions (50 °C and 20 bar H2) using water and methanol as the solvent. Among the various catalysts studied, the 0.15FePt/AC exhibited complete conversion of furfural with an FA selectivity of 74% after only 1 h of reaction time in water. The promotional effect of the bimetallic catalysts became less pronounced when methanol was used as the solvent and a 2-furaldehyde dimethyl acetal solvent product was formed. The superior catalyst performances were correlated with the higher Pt dispersion, the presence of low coordination Pt sites, and the strong Pt–Fe interaction as characterized by X-ray diffraction, H2 temperature-programmed reduction (H2-TPR), N2 physisorption, and infrared spectroscopy of the adsorbed CO (CO-IR). However, to simply use a magnet for catalyst separation, 0.5 wt% Fe was the minimum Fe loading on the Pt/AC. The 0.5FePt/AC still exhibited good magnetic properties after the third consecutive runs. Full article
(This article belongs to the Special Issue Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application)
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13 pages, 2427 KiB  
Article
Preparation and Catalytic Hydrodechlorination Property of Nano Bimetallic Catalyst Pd–Ni/γAl2O3–SiO2
by Yalong Liao, Yiyang Wang and Yu Zhang
Catalysts 2022, 12(4), 370; https://0-doi-org.brum.beds.ac.uk/10.3390/catal12040370 - 24 Mar 2022
Cited by 6 | Viewed by 1791
Abstract
Pd–Ni bimetallic catalyst supported on a composite carrier of γAl2O3 and SiO2 was prepared by chemical precipitation methodology enhanced with an ultrasonic wave. In the present paper, the influence of dispersant, carrier, ultrasonic time and intensity on the dechlorination [...] Read more.
Pd–Ni bimetallic catalyst supported on a composite carrier of γAl2O3 and SiO2 was prepared by chemical precipitation methodology enhanced with an ultrasonic wave. In the present paper, the influence of dispersant, carrier, ultrasonic time and intensity on the dechlorination property of the catalysts obtained are investigated. The appearance, morphology and structure of the prepared catalysts were characterized using X-ray diffraction (XRD), scanning transmission electron microscopy (STEM), N2 adsorption–desorption isotherm and X-ray photoelectron spectroscopy spectrometer (XPS). The chemical composition of active gradients in the catalysts was tested with inductively coupled plasma-atomic emission spectrometry (ICP-AES). The metal dispersion and mean particle size of the metallic phase of the prepared catalysts were also determined with CO chemisorption. Results indicate that a nano bimetal Pd–Ni catalyst on an average particle size of 2.45 nm with a distribution range of 1–7 nm supported on a composite carrier of γAl2O3 and SiO2 can be effectively prepared, and that the chlorine content of shellac dechlorinated with the obtained catalyst is 0.18 wt%, which is lower than that reported in the previous literature, indicating the perfect dechlorination property of the catalyst. Full article
(This article belongs to the Special Issue Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application)
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14 pages, 3960 KiB  
Article
Synthesis of Methyl Mercaptan on Mesoporous Alumina Prepared with Hydroxysafflor Yellow A as Template: The Synergistic Effect of Potassium and Molybdenum
by Chuang Peng, Dong Zeng, Jianjun Li, Shuai Peng, Jun Xiong, Weiming Wang, Yingming Chen, Hong Liu, Hao Liu and Rui Qin
Catalysts 2021, 11(11), 1365; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11111365 - 13 Nov 2021
Cited by 6 | Viewed by 2040
Abstract
K-promoted Mo-based catalysts showed great promise for the hydrogenation of CS2 to methyl mercaptan (CH3SH). However, the research on the synergistic effect of K and Mo, and the active site of CS2 hydrogenation to CH3SH were unexplored [...] Read more.
K-promoted Mo-based catalysts showed great promise for the hydrogenation of CS2 to methyl mercaptan (CH3SH). However, the research on the synergistic effect of K and Mo, and the active site of CS2 hydrogenation to CH3SH were unexplored widely. To solve this problem, the synergistic effect of K and Mo in the K-promoted Mo-based catalysts for CS2 hydrogenation to prepare CH3SH was investigated. The mesoporous alumina was the support and loaded the active components potassium and molybdenum to prepare the catalyst. The results suggested that the active components K and Mo can not only cooperatively regulate the acid-base sites on the catalyst surface, but also stabilize the molybdate species at +5 valence during the reduction process and increase the Mo unsaturated coordination sites. Combined with the results of the catalytic activity evaluation, indicating that the main active site of the catalysts is the weak Lewis acid-base site, and the strong acidic site and strong alkaline site are not conducive to the formation of CH3SH. Moreover, the possible catalytic mechanism of CS2 hydrogenation to CH3SH on the weak Lewis acid-base sites of the catalysts was proposed. The research results of this paper can provide an experimental basis and theoretical guidance for the design of high-performance CH3SH synthesis catalyst and further mechanism research. Full article
(This article belongs to the Special Issue Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application)
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9 pages, 2150 KiB  
Communication
Dual-Modified Cu2S with MoS2 and Reduced Graphene Oxides as Efficient Photocatalysts for H2 Evolution Reaction
by Enna Ha, Zongyuan Xin, Danyang Li, Jingge Zhang, Tao Ji, Xin Hu, Luyang Wang and Junqing Hu
Catalysts 2021, 11(11), 1278; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11111278 - 22 Oct 2021
Cited by 1 | Viewed by 2012
Abstract
Noble metal-free cocatalysts have drawn great interest in accelerating the catalytic reactions of metal chalcogenide semiconductor photocatalyst. In particular, great efforts have been made on modifying a semiconductor with dual cocatalysts, which show synergistic effect of a fast transfer of exciton and energy [...] Read more.
Noble metal-free cocatalysts have drawn great interest in accelerating the catalytic reactions of metal chalcogenide semiconductor photocatalyst. In particular, great efforts have been made on modifying a semiconductor with dual cocatalysts, which show synergistic effect of a fast transfer of exciton and energy simultaneously. Herein, we report the dual-modified Cu2S with MoS2 and reduced graphene oxides (Cu2S-MoS2/rGO). The in situ growth of Cu2S nanoparticles in the presence of MoS2/rGO resulted in high density of nanoscale interfacial contacts among Cu2S nanoparticles, MoS2, and rGO, which is beneficial for reducing the photogenerated electrons’ and holes’ recombination. The Cu2S-MoS2/rGO system also demonstrated stable photocatalytic activity for H2 evolution reaction for the long term. Full article
(This article belongs to the Special Issue Novel Bimetallic Catalysts: Synthesis, Characterization, Evaluation, and Application)
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