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Catalysts
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Catalytic CO Oxidation and Preferential CO Oxidation (PROX)
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Catalytic CO Oxidation and Preferential CO Oxidation (PROX)

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

Deadline for manuscript submissions: closed (31 January 2022) | Viewed by 5697

Special Issue Editors

Dr. Sharif Najafishirtari

E-Mail Website1 Website2
Guest Editor
Institute for Inorganic Chemistry, NETZ – NanoEnergieTechnikZentrum, Universität Duisburg-Essen, Carl-Benz-Str. 199, 47057 Duisburg, Germany
Interests: heterogeneous catalysis; operando characterization; spectroscopy; colloidal chemistry; model catalysts; structure-activity correlations; oxidation reactions; surface analysis
Special Issues, Collections and Topics in MDPI journals
Dr. Karin Föttinger

E-Mail Website
Guest Editor
Institute of Materials Chemistry, Vienna University of Technology, Vienna, Austria
Interests: catalysis; reaction mechanisms; operando spectroscopy; structure-performance relationships; environmental catalysis; C1 chemistry
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue will collect recent advances and insights into CO oxidation and PROX. Catalytic CO oxidation is a widely studied reaction, because of its great practical importance in automotive exhaust gas control and in H2 purification for proton exchange membrane fuel cells. On top of that, CO oxidation is a simple but very useful model reaction for investigating active sites and reaction pathways in various catalyst materials. Of particular interest are the development of three-way-catalysts with low ignition temperatures to reduce automotive emissions during the engine cold start and the improvement of catalysts stability against sintering under the high operating temperatures of the exhaust gas, especially in the presence of moisture. The preferential CO oxidation (PROX) is of interest as H2 purification technology to obtain CO-free H2 for hydrogen-powered fuel cells, particularly for small-scale portable and on-board power units. PROX catalysts require high activity, selectivity, and stability.

Topics of interest include metal and metal oxide catalysts, the role of metal/oxide interfaces, mechanistic studies, investigations of the nature of active sites, structure-activity-correlations, in situ/operando spectroscopy, the development and synthesis of new materials, model studies and DFT modeling. Contributions exploring other related topics are also welcome.   

Dr. Sharif Najafishirtari
Prof. Dr. Karin Föttinger
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

  • CO oxidation
  • H2 oxidation
  • O2 activation
  • Reaction mechanism and kinetics
  • Active sites
  • Stability and deactivation
  • In situ and operando catalyst characterization
  • Structure-activity-correlations

Published Papers (2 papers)

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Research

14 pages, 5873 KiB  
Article
Activation of Pt Nanoclusters on TiO2 via Tuning the Metallic Sites to Promote Low-Temperature CO Oxidation
by Kailin He and Qingyue Wang
Catalysts 2021, 11(11), 1280; https://doi.org/10.3390/catal11111280 - 23 Oct 2021
Cited by 8 | Viewed by 2482
Abstract
Metallic Pt sites are imperative in the CO oxidation reaction. Herein, we demonstrate the tuning of Pt sites by treating a Pt catalyst in various reductive atmospheres, influencing the catalyst activities in low-temperature CO oxidation. The H2 pretreatment of Pt clusters at [...] Read more.
Metallic Pt sites are imperative in the CO oxidation reaction. Herein, we demonstrate the tuning of Pt sites by treating a Pt catalyst in various reductive atmospheres, influencing the catalyst activities in low-temperature CO oxidation. The H2 pretreatment of Pt clusters at 200 °C decreases the T50 from 208 °C to 183 °C in the 0.1 wt % Pt/TiO2 catalyst. The T50 shows a remarkable improvement using a CO pretreatment, which decreases the T50 further to 135 °C. A comprehensive characterization study reveals the integrated reasons behind this phenomenon: (i) the extent of PtO transition to metallic Pt sites, (ii) the ample surface active oxygen triggered by metallic Pt, (iii) the CO selectively adsorbs on metallic Pt sites which participate in low-temperature CO oxidation, and (iv) the formation of the unstable intermediate such as bicarbonate, contributes together to the enhanced activity of CO pretreated Pt/TiO2. Full article
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX))
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20 pages, 6341 KiB  
Article
CO Total and Preferential Oxidation over Stable Au/TiO2 Catalysts Derived from Preformed Au Nanoparticles
by Núria J. Divins, Eduardo López, Inmaculada Angurell, Stefan Neuberg, Ralf Zapf, Gunther Kolb and Jordi Llorca
Catalysts 2020, 10(9), 1028; https://doi.org/10.3390/catal10091028 - 7 Sep 2020
Cited by 3 | Viewed by 2417
Abstract
CO preferential oxidation (PROX) is an effective method to clean reformate H2 streams to feed low-temperature fuel cells. In this work, the PROX and CO oxidation reactions were studied on preformed Au nanoparticles (NPs) supported on TiO2 anatase. Preformed Au NPs [...] Read more.
CO preferential oxidation (PROX) is an effective method to clean reformate H2 streams to feed low-temperature fuel cells. In this work, the PROX and CO oxidation reactions were studied on preformed Au nanoparticles (NPs) supported on TiO2 anatase. Preformed Au NPs were obtained from gold cores stabilized by dodecanethiols or trimethylsilane-dendrons. A well-controlled size of ca. 2.6 nm and narrow size distributions were achieved by this procedure. The catalysts were characterized by high-resolution transmission electron microscopy and ex situ and in situ X-ray photoelectron spectroscopy (XPS). The XPS results showed that the preformed Au NPs exhibited high thermal stability. The different ligand-derived Au catalysts, as well as a conventional gold catalyst for comparison purposes, were loaded onto cordierite supports with 400 cells per square inch. The activity and selectivity of the samples were evaluated for various operation conditions. The catalyst prepared using dodecanethiol-capped Au NPs showed the best performance. In fact, CO conversions of up to 70% at 40% CO2 selectivity and 90% O2 conversion were observed operating at 363 K in H2-rich atmospheres. The performance of the best catalysts was subsequently tested on stainless steel microreactors. A 500-hour stability test was carried out under a real post-reformate stream, including 18 vol.% CO2 and 29 vol.% H2O. A mean CO conversion of ca. 24% was measured for the whole test operating at 453 K and a gas hourly space velocity (GHSV) of 1.3 × 104 h−1. These results reveal our dodecanethiol- and carbosilane-derived Au catalysts as extremely promising candidates to conduct a PROX reaction while avoiding deactivation, which is one of the major drawbacks of Au/TiO2 catalysts. Full article
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX))
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