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Catalysts
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State-of-the-Art Catalytic Materials in Europe
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State-of-the-Art Catalytic Materials in Europe

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 25906

Special Issue Editors

Prof. Dr. Magdalena Janus

E-Mail Website
Guest Editor
Faculty of Civil and Environmental Engineering, West Pomeranian University of Technology, Szczecin, Al. Piastów 50, 70-311 Szczecin, Poland
Interests: photocatalysis; photoactive building materials; water treatment; titanium dioxide
Special Issues, Collections and Topics in MDPI journals
Dr. Ewelina Kusiak-Nejman

E-Mail Website
Guest Editor
Faculty of Chemical Technology and Engineering, West Pomeranian University of Technology in Szczecin, Szczecin, Poland
Interests: photocatalysis; air and water purification

Special Issue Information

Dear Colleagues,

We would like to invite you to send your work to the Special Issue titled “State-of-the-Art Catalytic Materials in Europe”. A special invitation is addressed to researchers from Europe. We are waiting for work on the preparation and testing of catalysts, the use of catalysts in synthesis or the use of catalysts in water and air purification. This Special Issue welcomes both review and original research articles. Topics include but are not limited to the following:

  • Catalysts preparation;
  • Catalysts characterization;
  • Water/wastewater treatment and disinfection;
  • Air treatment;
  • New materials for photochemistry and photocatalysis.

Dr. Magdalena Janus
Dr. Ewelina Kusiak-Nejman
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 2200 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

  • catalysts
  • photocatalysts
  • water purification
  • air purification
  • synthesis
  • catalytic materials

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Published Papers (4 papers)

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Research

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17 pages, 4692 KiB  
Article
Bulk Co3O4 for Methane Oxidation: Effect of the Synthesis Route on Physico-Chemical Properties and Catalytic Performance
by Andoni Choya, Beatriz de Rivas, Jose Ignacio Gutiérrez-Ortiz and Rubén López-Fonseca
Catalysts 2022, 12(1), 87; https://doi.org/10.3390/catal12010087 - 13 Jan 2022
Cited by 12 | Viewed by 2333
Abstract
The synthesis of bulk pure Co3O4 catalysts by different routes has been examined in order to obtain highly active catalysts for lean methane combustion. Thus, eight synthesis methodologies, which were selected based on their relatively low complexity and easiness for [...] Read more.
The synthesis of bulk pure Co3O4 catalysts by different routes has been examined in order to obtain highly active catalysts for lean methane combustion. Thus, eight synthesis methodologies, which were selected based on their relatively low complexity and easiness for scale-up, were evaluated. The investigated procedures were direct calcination of two different cobalt precursors (cobalt nitrate and cobalt hydroxycarbonate), basic grinding route, two basic precipitation routes with ammonium carbonate and sodium carbonate, precipitation-oxidation, solution combustion synthesis and sol-gel complexation. A commercial Co3O4 was also used as a reference. Among the several examined methodologies, direct calcination of cobalt hydroxycarbonate (HC sample), basic grinding (GB sample) and basic precipitation employing sodium carbonate as the precipitating agent (CC sample) produced bulk catalysts with fairly good textural and structural properties, and remarkable redox properties, which were found to be crucial for their good performance in the oxidation of methane. All catalysts attained full conversion and 100% selectivity towards CO2 formation at a temperature of 600 °C while operating at 60,000 h−1. Among these, the CC catalyst was the only one that achieved a specific reaction rate higher than that of the reference commercial Co3O4 catalyst. Full article
(This article belongs to the Special Issue State-of-the-Art Catalytic Materials in Europe)
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11 pages, 1257 KiB  
Article
Pd/Alumina Catalysts for Beneficial Transformation of Harmful Freon R-22
by Monika Radlik, Wojciech Juszczyk, Erhard Kemnitz and Zbigniew Karpiński
Catalysts 2021, 11(10), 1178; https://doi.org/10.3390/catal11101178 - 28 Sep 2021
Cited by 4 | Viewed by 2218
Abstract
Chlorodifluoromethane (R-22), the most abundant freon in the atmosphere, was subjected to successful hydrodechlorination in the presence of palladium supported on γ-alumina, at a relatively low reaction temperature (180 °C). The combination of catalytic actions of alumina (performing freon dismutation) and Pd nanoparticles [...] Read more.
Chlorodifluoromethane (R-22), the most abundant freon in the atmosphere, was subjected to successful hydrodechlorination in the presence of palladium supported on γ-alumina, at a relatively low reaction temperature (180 °C). The combination of catalytic actions of alumina (performing freon dismutation) and Pd nanoparticles (catalyzing C–Cl bond splitting in the presence of hydrogen) results in the transformation of freon into valuable, chlorine-free products: methane and fluoroform, the mixture of which is used in plasma etching of silicon and silicon nitride. Very highly metal dispersed Pt/Al2O3 catalysts, with metal particles of ~1.3 nm in size, are not as effective as Pd/Al2O3, resulting in only partial dechlorination. A long-term dechlorination screening (3–4 days) showed good catalytic stability of Pd/alumina catalysts. Full article
(This article belongs to the Special Issue State-of-the-Art Catalytic Materials in Europe)
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14 pages, 1903 KiB  
Article
Chlorodifluoromethane Hydrodechlorination on Carbon-Supported Pd-Pt Catalysts. Beneficial Effect of Catalyst Oxidation
by Monika Radlik, Wojciech Juszczyk, Wioletta Raróg-Pilecka, Magdalena Zybert and Zbigniew Karpiński
Catalysts 2021, 11(5), 525; https://doi.org/10.3390/catal11050525 - 21 Apr 2021
Viewed by 2087
Abstract
Previously tested 2 wt % palladium-platinum catalysts supported on Norit activated carbon preheated to 1600 °C have been reinvestigated in CHFCl2 hydrodechlorination. An additionally adopted catalyst oxidation at 350–400 °C produced nearly an order of magnitude increase in the turnover frequency of [...] Read more.
Previously tested 2 wt % palladium-platinum catalysts supported on Norit activated carbon preheated to 1600 °C have been reinvestigated in CHFCl2 hydrodechlorination. An additionally adopted catalyst oxidation at 350–400 °C produced nearly an order of magnitude increase in the turnover frequency of Pd/C, from 4.1 × 10−4 to 2.63 × 10−3 s−1. This increase is not caused by changes in metal dispersion or possible decontamination of the Pd surface from superficial carbon, but rather by unlocking the active surface, originally inaccessible in metal particles tightly packed in the pores of carbon. Burning carbon from the pore walls attached to the metal changes the pore structure, providing easier access for the reactants to the entire palladium surface. Calcination of Pt/C and Pd-Pt/C catalysts results in much smaller evolution of catalytic activity than that observed for Pd/C. This shapes the relationship between turnover frequency (TOF) and alloy composition, which now does not confirm the Pd-Pt synergy invoked in the previous work. The absence of this synergy is confirmed by gradual regular changes in product selectivity, from 70 to 80% towards CH2F2 for Pd/C to almost 60% towards CH4 for Pt/C. The use of even higher-preheated carbon (1800 °C), completely free of micropores, results in a Pd/C catalyst that does not need to be oxidized to achieve high activity and excellent selectivity to CH2F2 (>90%). Full article
(This article belongs to the Special Issue State-of-the-Art Catalytic Materials in Europe)
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Review

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56 pages, 6811 KiB  
Review
C-,N- and S-Doped TiO2 Photocatalysts: A Review
by Aleksandra Piątkowska, Magdalena Janus, Kacper Szymański and Sylwia Mozia
Catalysts 2021, 11(1), 144; https://doi.org/10.3390/catal11010144 - 19 Jan 2021
Cited by 203 | Viewed by 18256
Abstract
This article presents an overview of the reports on the doping of TiO2 with carbon, nitrogen, and sulfur, including single, co-, and tri-doping. A comparison of the properties of the photocatalysts synthesized from various precursors of TiO2 and C, N, or [...] Read more.
This article presents an overview of the reports on the doping of TiO2 with carbon, nitrogen, and sulfur, including single, co-, and tri-doping. A comparison of the properties of the photocatalysts synthesized from various precursors of TiO2 and C, N, or S dopants is summarized. Selected methods of synthesis of the non-metal doped TiO2 are also described. Furthermore, the influence of the preparation conditions on the doping mode (interstitial or substitutional) with reference to various types of the modified TiO2 is summarized. The mechanisms of photocatalysis for the different modes of the non-metal doping are also discussed. Moreover, selected applications of the non-metal doped TiO2 photocatalysts are shown, including the removal of organic compounds from water/wastewater, air purification, production of hydrogen, lithium storage, inactivation of bacteria, or carbon dioxide reduction. Full article
(This article belongs to the Special Issue State-of-the-Art Catalytic Materials in Europe)
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