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

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

Deadline for manuscript submissions: closed (30 June 2024) | Viewed by 2638

Special Issue Editors

Dr. Sharif Najafishirtari

E-Mail Website
Guest Editor
Solid State Chemistry and Catalysis, Institute for Inorganic Chemistry, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Straße 2, 24118 Kiel, 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
Dr. Karin Föttinger
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

  • CO oxidation
  • H2 oxidation
  • O2 activation
  • reaction mechanism and kinetics
  • active sites
  • stability and deactivation
  • in situ and operando catalyst characterization
  • structure-activity-correlations

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Published Papers (3 papers)

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Research

11 pages, 2390 KiB  
Article
Catalytic Decontamination of Carbon Monoxide Using Strong Metal–Support Interactions on TiO2 Microparticles
by Avraham Dayan, Jacob Alter and Gideon Fleminger
Catalysts 2024, 14(9), 622; https://doi.org/10.3390/catal14090622 - 15 Sep 2024
Viewed by 218
Abstract
The traditional catalytic oxidation of carbon monoxide (CO) using metal oxide catalysts often requires either high temperatures (thermocatalysis) or ultraviolet light (UV) excitation (photocatalysis), limiting practical applications under ambient conditions. Our research aimed to develop a catalytic system capable of oxidizing CO to [...] Read more.
The traditional catalytic oxidation of carbon monoxide (CO) using metal oxide catalysts often requires either high temperatures (thermocatalysis) or ultraviolet light (UV) excitation (photocatalysis), limiting practical applications under ambient conditions. Our research aimed to develop a catalytic system capable of oxidizing CO to CO2 at room temperature and in the dark. Using the Strong Metal–Support Interaction (SMSI) methodology, several titanium oxide (TiO2)-complexed metals were prepared (Ag, Au, Pd, and Pt). The highest catalytic efficiency of CO oxidation at room temperature was demonstrated for the TiO2-Pt complex. Therefore, this complex was further examined structurally and functionally. Two modes of operation were addressed. The first involved applying the catalytic system to remove CO from an individual’s environment (environmental system), while the second involved the installation of the catalysis chamber as a part of a personal protection unit (e.g., a mask). The catalytic activity exhibited a significant reduction in CO levels in both the environmental and personal protection scenarios. The practical application of the system was demonstrated through efficient CO oxidation in air emitted from a controlled fire experiment conducted in collaboration with the Israel Fire and Rescue Authority. Full article
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX) II)
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14 pages, 5235 KiB  
Article
Highly Active Cerium Oxide Supported Solution Combustion Cu/Mn Catalysts for CO-PrOx in a Hydrogen-Rich Stream
by Sbusiso Motha, Abdul S. Mahomed, Sooboo Singh and Holger B. Friedrich
Catalysts 2024, 14(9), 603; https://doi.org/10.3390/catal14090603 - 7 Sep 2024
Viewed by 400
Abstract
Mono- and di-substituted cerium oxide catalysts, viz. Ce0.95Cu0.05O2-δ, Ce0.90Cu0.10O2-δ, Ce0.90 Cu0.05Mn0.05O2-δ, Ce0.85Cu0.10Mn0.05O2-δ, and Ce0.80Cu0.10 [...] Read more.
Mono- and di-substituted cerium oxide catalysts, viz. Ce0.95Cu0.05O2-δ, Ce0.90Cu0.10O2-δ, Ce0.90 Cu0.05Mn0.05O2-δ, Ce0.85Cu0.10Mn0.05O2-δ, and Ce0.80Cu0.10Mn0.10O2-δ, were synthesized via a one-step urea-assisted solution combustion method. The elemental composition and textural and structural properties of the catalysts were determined by various physical, electronic, and chemical characterization techniques. Hydrogen temperature-programmed reduction showed that co-doping of copper and manganese ions into the CeO2-δ lattice improved the reducibility of copper. Powder XRD, XPS, HR-TEM, and Raman spectroscopy showed that the catalysts were a singled-phased, solid-solution metal oxide with a cerium oxide cubic fluorite (cerianite) structure, and evidence of oxygen vacancies was observed. Catalytic results in the preferential oxidation of CO in a hydrogen-rich stream showed that complete CO conversion occurred between 150 and 180 °C. Furthermore, at 150 °C, Ce0.90Cu0.05Mn0.05O2-δ, Ce0.90 Cu0.10O2-δ, and Ce0.85Cu0.10Mn0.05O2-δ catalysts were the most active, achieving complete CO conversion and CO2 selectivity of 81, 79, and 71%, respectively. The catalysts performed moderately in the presence of CO2 and water, with the Ce0.90Cu0.05Mn0.05O2-δ catalyst giving a CO conversion of 80% in CO2, which decreased to about 60% when water was added. Full article
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX) II)
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13 pages, 8611 KiB  
Article
Platinum on High-Entropy Aluminate Spinels as Thermally Stable CO Oxidation Catalysts
by Christopher Riley, Andrew De La Riva, Nichole Valdez, Ryan Alcala, Ping Lu, Richard Grant, Angelica Benavidez, Mark Rodriguez, Abhaya Datye and Stanley S. Chou
Catalysts 2024, 14(3), 211; https://doi.org/10.3390/catal14030211 - 21 Mar 2024
Viewed by 1186
Abstract
Thermal degradation is a leading cause of automotive catalyst deactivation. Because high-entropy oxides are uniquely stabilized at high temperatures via an increase in configurational entropy, these materials may offer new mechanisms for preventing the thermal deactivation of precious metal catalysts. In this work, [...] Read more.
Thermal degradation is a leading cause of automotive catalyst deactivation. Because high-entropy oxides are uniquely stabilized at high temperatures via an increase in configurational entropy, these materials may offer new mechanisms for preventing the thermal deactivation of precious metal catalysts. In this work, we evaluated platinum loaded on simple and high-entropy aluminate spinels (MAl2O4, where M = Co, Cu, Mg, Ni, or mixtures thereof) in carbon monoxide oxidation before and after aging at 800 °C. Pt supported on all simple spinels showed significant deactivation after thermal aging compared to the fresh samples, with T90 increasing by at least 60 °C. However, Pt on high-entropy spinels had nearly the same or better activity after aging, with T90 increasing by only 6 °C at most. During aging and reduction, copper exsolved from the spinel supports and alloyed with platinum. This interaction promoted low temperature oxidation activity, presumably through weakened CO binding, but did not prevent deactivation. On the other hand, Co, Mg, and Ni constituents promoted stronger CO bonding, as evidenced by apparent negative order kinetics and poor activity at low temperatures. High-entropy spinels, containing a variety of active metals, displayed synergetic reactant adsorption capacity and cooperative effects with supported platinum particles, which collectively prevented thermal deactivation. Full article
(This article belongs to the Special Issue Catalytic CO Oxidation and Preferential CO Oxidation (PROX) II)
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