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Journals
Catalysts
Special Issues
Preferential Oxidation of Carbon Monoxide
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Preferential Oxidation of Carbon Monoxide

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

Deadline for manuscript submissions: closed (28 February 2019) | Viewed by 10608

Special Issue Editors

Dr. Miguel Angel Centeno

E-Mail Website
Guest Editor
Departamento de Química Inorgánica, Instituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC—Universidad de Sevilla, 41092 Sevilla, Spain
Interests: heterogeneous catalysis; structured catalysts; H2; biomass; CO2; microreactors; environment and energy; carbon-based catalysts
Special Issues, Collections and Topics in MDPI journals
Dr. Oscar H. Laguna

E-Mail Website1 Website2
Guest Editor
Inorganic Chemistry, University of Sevilla, 41004 Sevilla, Spain
Interests: chemical engineering; materials science; heterogeneous catalysis; microrection technology; hydrogen purification; gold catalysts; carbon capture and utilization CCU; CO2 recycling; ceria based catalysts
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Preferential Oxidation of Carbon Monoxide (CO-PROX) is one of the preferred technologies for the removal of CO contamination from H2-rich fuel gases coming from reforming processes. Low-temperature polymer electrolyte membrane fuel cells (PEMFCs) require high-purity hydrogen as fuel. The reformate gas contains, not only H2, but also CO, CO2, H2O, and other gaseous contaminants. Specially, the CO content should be limited to less than 10 ppm. CO-PROX, which imply the oxidation of the CO with air of the pre-cleaned reformate is a cheap and effective solution since it is carried out at atmospheric pressure and temperatures in the range of the PEM working ones. The control of the selectivity of the CO-PROX process is a key factor. Along with the CO oxidation, the H2 oxidation, the WGS equilibrium and the CO and CO2 hydrogenation reactions can proceed. Then, CO-PROX requires very selective catalysts able to remove CO without oxidize H2. The selectivity can also be improved by working at low temperatures, where CO oxidation is favoured and the reverse Water Gas Shift limited. Due to the very fast chemical kinetics and exothermicity of CO-PROX, the use of metallic structured catalysts and microreactors can avoid the existence of hot spots, and other problems associated with mass and heat transport limitations, favoring the selectivity. In addition, these systems are ideal for small-scale fuel processors for portable and on-board applications.

This Special Issue of Catalysts focuses on the different aspects dealing with the CO-PROX reaction. The design, characterization and testing of active catalysts and catalytic devices, as well as operando and kinetics studies aimed at solving the mechanism of the considered reaction will be welcomed.  

Dr. Miguel Angel Centeno
Dr. Oscar Hernando Laguna
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

  • H2 production
  • H2 clean-up
  • Unconventional gases
  • Dry & Steam reforming of CH4
  • Water gas shift
  • CO and CO2 methanation
  • CO abatement
  • Structured catalysts
  • Microchannel reactors/microreactors
  • Process intensification
  • Kinetic studies
  • In Situ and operando studies
  • Noble metal catalysts
  • Transition metal oxides catalysts
  • Supported catalysts
  • Catalyst development and design
  • Characterization of catalysts

Published Papers (2 papers)

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Research

14 pages, 1832 KiB  
Article
Improving Fe/Al2O3 Catalysts for the Reverse Water-Gas Shift Reaction: On the Effect of Cs as Activity/Selectivity Promoter
by Laura Pastor-Pérez, Mihir Shah, Estelle Le Saché and Tomas Ramirez Reina
Catalysts 2018, 8(12), 608; https://doi.org/10.3390/catal8120608 - 03 Dec 2018
Cited by 55 | Viewed by 5549
Abstract
The conversion of CO2 into CO via the Reverse Water–Gas Shift (RWGS) reaction is a suitable route for CO2 valorisation. Fe-based catalysts are highly active for this reaction, but their activity and selectivity can be substantially boosted by adding Cs as [...] Read more.
The conversion of CO2 into CO via the Reverse Water–Gas Shift (RWGS) reaction is a suitable route for CO2 valorisation. Fe-based catalysts are highly active for this reaction, but their activity and selectivity can be substantially boosted by adding Cs as a promoter. In this work we demonstrate that Cs modifies the redox behaviour and the surface chemistry of the iron-based materials. The metallic dispersion and the amount of metallic Fe centres available for the reaction depends on Cs loading. 5 wt. % of Cs is an optimum amount of dopant to achieve a fair activity/selective balance. Nevertheless, depending on the RWGS reactor operational temperature, lower concentrations of Cs also lead to acceptable catalytic performance. Along with the excellent activity of the prepared materials this work showcases their robustness for long-term runs and the strong impact of H2/CO ratio in the overall catalytic performance. Full article
(This article belongs to the Special Issue Preferential Oxidation of Carbon Monoxide)
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12 pages, 3931 KiB  
Article
Versatile Synthesis of Pd and Cu Co-Doped Porous Carbon Nitride Nanowires for Catalytic CO Oxidation Reaction
by Kamel Eid, Yahia H. Ahmad, Assem T. Mohamed, Anas G. Elsafy and Siham Y. Al-Qaradawi
Catalysts 2018, 8(10), 411; https://doi.org/10.3390/catal8100411 - 22 Sep 2018
Cited by 18 | Viewed by 4015
Abstract
Developing efficient catalyst for CO oxidation at low-temperature is crucial in various industrial and environmental remediation applications. Herein, we present a versatile approach for controlled synthesis of carbon nitride nanowires (CN NWs) doped with palladium and copper (Pd/Cu/CN NWs) for CO oxidation reactions. [...] Read more.
Developing efficient catalyst for CO oxidation at low-temperature is crucial in various industrial and environmental remediation applications. Herein, we present a versatile approach for controlled synthesis of carbon nitride nanowires (CN NWs) doped with palladium and copper (Pd/Cu/CN NWs) for CO oxidation reactions. This is based on the polymerization of melamine by nitric acid in the presence of metal-precursors followed by annealing under nitrogen. This intriguingly drove the formation of well-defined, one-dimensional nanowires architecture with a high surface area (120 m2 g−1) and doped atomically with Pd and Cu. The newly-designed Pd/Cu/CN NWs fully converted CO to CO2 at 149 °C, that was substantially more active than that of Pd/CN NWs (283 °C) and Cu/CN NWs (329 °C). Moreover, Pd/Cu/CN NWs fully reserved their initial CO oxidation activity after 20 h. This is mainly attributed to the combination between the unique catalytic properties of Pd/Cu and outstanding physicochemical properties of CN NWs, which tune the adsorption energies of CO reactant and reaction product during the CO oxidation reaction. The as-developed method may open new frontiers on using CN NWs supported various noble metals for CO oxidation reaction. Full article
(This article belongs to the Special Issue Preferential Oxidation of Carbon Monoxide)
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