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Catalysts
Special Issues
Heterogeneous Catalysts Optimization: From Material Design to Properties
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Heterogeneous Catalysts Optimization: From Material Design to Properties

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

Deadline for manuscript submissions: closed (20 December 2021) | Viewed by 10891

Special Issue Editors

Dr. Maria Chiara Spadaro

E-Mail Website
Guest Editor
1. Catalan Institute of Nanoscience and Nanotechnology (ICN2), 08193 Bellaterra, Barcelona, Spain
2. Engineering College, Swansea University, Swansea SA2 8PP, UK
Interests: electron microscopy; (S)TEM; electron energy loss spectroscopy; material science; catalysis
Dr. Pengyi Tang

E-Mail Website
Guest Editor
2020 X-Lab, Shanghai Institute of Microsystem and Information, Chinese Academy of Sciences, Shanghai 200050, China
Interests: (photo-)electrochemical water splitting; catalysis; supercapacitor; heterojunctions interfaces; aberration corrected transmission electron microscope
Special Issues, Collections and Topics in MDPI journals
Dr. Jerome Vernieres

E-Mail Website
Guest Editor
Surface Physics and Catalysis (SURFCAT), Department of Physics, Technical University of Denmark (DTU), 2800 Kgs. Lyngb, Denmark
Interests: material science; nanoparticles; cluster beam deposition; X-ray photoelectron spectroscopy; catalysis; environmental- and bio-sensing

Special Issue Information

Dear Colleagues,

In recent decades, a wide range of synthesis routes have emerged for the optimization of catalytic nanostructured materials aiming at the improvement of both the production rate and selectivity of chemical production. The control of nanostructure composition, size, oxidation state, morphology (2D layer, nanoparticle/cluster or more complex hybrid structures), and support–catalyst interaction are essential factors to produce highly active and stable catalysts. In that regard, the central role of the catalysts’ design processes and the understanding of the main mechanisms involved, via atomic resolution characterization, has been demonstrated.

This Special Issue focuses on state-of-the-art routes for catalyst design with tailored properties (reactivity, activity, and selectivity) toward specific processes with the goal of their implementation in future sustainable energy solutions. In addition, the comprehensive understanding of nanostructured materials’ behavior via high-resolution characterization techniques leading to the discovery of new materials will be of high interest in this Special Issue. We invite the scientific community to contribute here in the form of original research or review articles that explore the optimized design and study of catalytic materials.

Dr. Maria Chiara Spadaro
Dr. PengYi Tang
Dr. Jerome Vernieres
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

  • (photo-)electrochemical water splitting
  • heterojunction interfaces
  • catalysis
  • aberration-corrected transmission electron microscope
  • heterogeneous catalysis
  • microscopy
  • nanostructures
  • high spatial resolution
  • in situ/operando measurements
  • nanoparticles and clusters
  • single-atom catalyst
  • DFT calculations

Published Papers (4 papers)

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Research

24 pages, 4407 KiB  
Article
Modification of Cobalt Oxide Electrochemically Deposited on Stainless Steel Meshes with Co-Mn Thin Films Prepared by Magnetron Sputtering: Effect of Preparation Method and Application to Ethanol Oxidation
by Květa Jirátová, Roman Perekrestov, Michaela Dvořáková, Jana Balabánová, Martin Koštejn, Martin Veselý, Martin Čada, Pavel Topka, Dana Pokorná, Zdeněk Hubička and František Kovanda
Catalysts 2021, 11(12), 1453; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11121453 - 29 Nov 2021
Cited by 5 | Viewed by 1712
Abstract
Magnetron sputtering is an advantageous method for preparing catalysts supported on stainless steel meshes. Such catalysts are particularly suitable for processes carried out at high space velocities. One of these is the catalytic total oxidation of volatile organic compounds (VOC), economically feasible and [...] Read more.
Magnetron sputtering is an advantageous method for preparing catalysts supported on stainless steel meshes. Such catalysts are particularly suitable for processes carried out at high space velocities. One of these is the catalytic total oxidation of volatile organic compounds (VOC), economically feasible and environmentally friendly method of VOC abatement. The reactive radio frequency (RF) magnetron sputtering of Mn and Co + Mn mixtures in an oxidation Ar + O2 atmosphere was applied to form additional thin oxide coatings on cobalt oxide layers prepared by electrochemical deposition and heating on stainless steel meshes. Time of the RF magnetron sputtering was changed to obtain MnOx and CoMnOx coatings of various thickness (0.1–0.3 µm). The properties of the supported CoOx-MnOx and CoOx-CoMnOx catalysts were characterized by scanning electron microscopy (SEM), powder X-ray diffraction (XRD), temperature programmed reduction (H2-TPR), Fourier-transform infrared (FTIR) and Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The catalytic activity was investigated in the deep oxidation of ethanol, which was employed as a model VOC. According to the specific activities (amount of ethanol converted per unit mass of metal oxides per hour), the performance of CoOx-MnOx catalysts was higher than that of CoOx-CoMnOx ones. The catalysts with the smallest layer thickness (0.1 µm) showed the highest catalytic activity. Compared to the commercial pelletized Co-Mn-Al mixed oxide catalyst, the sputtered catalysts exhibited considerably higher (23–87 times) catalytic activity despite the more than 360–570 times lower content of the Co and Mn active components in the catalytic bed. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts Optimization: From Material Design to Properties)
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14 pages, 3371 KiB  
Article
Plasma Promotes Dry Reforming Reaction of CH4 and CO2 at Room Temperature with Highly Dispersed NiO/γ-Al2O3 Catalyst
by Shan-Shan Lin, Peng-Rui Li, Hui-Bo Jiang, Jian-Feng Diao, Zhong-Ning Xu and Guo-Cong Guo
Catalysts 2021, 11(12), 1433; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11121433 - 25 Nov 2021
Cited by 6 | Viewed by 2567
Abstract
Plasma is an efficient method that can activate inert molecules such as methane and carbon dioxide in a mild environment to make them reactive. In this work, we have prepared an AE-NiO/γ-Al2O3 catalyst using an ammonia-evaporation method for plasma promoted [...] Read more.
Plasma is an efficient method that can activate inert molecules such as methane and carbon dioxide in a mild environment to make them reactive. In this work, we have prepared an AE-NiO/γ-Al2O3 catalyst using an ammonia-evaporation method for plasma promoted dry reforming reaction of CO2 and CH4 at room temperature. According to the characterization data of XRD, H2-TPR, TEM, XPS, etc., the AE-NiO/γ-Al2O3 catalyst has higher dispersion, smaller particle size and stronger metal-support interaction than the catalyst prepared by the traditional impregnation method. In addition, the AE-NiO/γ-Al2O3 catalyst also exhibits higher activity in dry reforming reaction. This work provides a feasible reference experience for the research of plasma promoted dry reforming reaction catalysts at room temperature. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts Optimization: From Material Design to Properties)
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16 pages, 2662 KiB  
Article
Passivation of Co/Al2O3 Catalyst by Atomic Layer Deposition to Reduce Deactivation in the Fischer–Tropsch Synthesis
by José Antonio Díaz-López, Jordi Guilera, Martí Biset-Peiró, Dan Enache, Gordon Kelly and Teresa Andreu
Catalysts 2021, 11(6), 732; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11060732 - 14 Jun 2021
Cited by 4 | Viewed by 2915
Abstract
The present work explores the technical feasibility of passivating a Co/γ-Al2O3 catalyst by atomic layer deposition (ALD) to reduce deactivation rate during Fischer–Tropsch synthesis (FTS). Three samples of the reference catalyst were passivated using different numbers of ALD cycles (3, [...] Read more.
The present work explores the technical feasibility of passivating a Co/γ-Al2O3 catalyst by atomic layer deposition (ALD) to reduce deactivation rate during Fischer–Tropsch synthesis (FTS). Three samples of the reference catalyst were passivated using different numbers of ALD cycles (3, 6 and 10). Characterization results revealed that a shell of the passivating agent (Al2O3) grew around catalyst particles. This shell did not affect the properties of passivated samples below 10 cycles, in which catalyst reduction was hindered. Catalytic tests at 50% CO conversion evidenced that 3 and 6 ALD cycles increased catalyst stability without significantly affecting the catalytic performance, whereas 10 cycles caused blockage of the active phase that led to a strong decrease of catalytic activity. Catalyst deactivation modelling and tests at 60% CO conversion served to conclude that 3 to 6 ALD cycles reduced Co/γ-Al2O3 deactivation, so that the technical feasibility of this technique was proven in FTS. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts Optimization: From Material Design to Properties)
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13 pages, 3855 KiB  
Article
Octahedral Growth of PtPd Nanocrystals
by Diana Nelli, Cesare Roncaglia, Samuel Ahearn, Marcel Di Vece, Riccardo Ferrando and Chloé Minnai
Catalysts 2021, 11(6), 718; https://0-doi-org.brum.beds.ac.uk/10.3390/catal11060718 - 09 Jun 2021
Cited by 11 | Viewed by 2444
Abstract
PtPd nanoparticles are among the most widely studied nanoscale systems, mainly because of their applications as catalysts in chemical reactions. In this work, a combined experimental-theoretical study is presented about the dependence of growth shape of PtPd alloy nanocrystals on their composition. The [...] Read more.
PtPd nanoparticles are among the most widely studied nanoscale systems, mainly because of their applications as catalysts in chemical reactions. In this work, a combined experimental-theoretical study is presented about the dependence of growth shape of PtPd alloy nanocrystals on their composition. The particles are grown in the gas phase and characterized by STEM-HRTEM. PtPd nanoalloys present a bimodal size distribution. The size of the larger population can be tuned between 3.8 ± 0.4 and 14.1 ± 2.0 nm by controlling the deposition parameters. A strong dependence of the particle shape on the composition is found: Pd-rich nanocrystals present more rounded shapes whereas Pt-rich ones exhibit sharp tips. Molecular dynamics simulations and excess energy calculations show that the growth structures are out of equilibrium. The growth simulations are able to follow the growth shape evolution and growth pathways at the atomic level, reproducing the structures in good agreement with the experimental results. Finally the optical absorption properties are calculated for PtPd nanoalloys of the same shapes and sizes grown in our experiments. Full article
(This article belongs to the Special Issue Heterogeneous Catalysts Optimization: From Material Design to Properties)
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