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Design, Synthesis, and Modification of Efficient Catalyst Materials

A special issue of International Journal of Molecular Sciences (ISSN 1422-0067). This special issue belongs to the section "Materials Science".

Deadline for manuscript submissions: 20 September 2024 | Viewed by 4098

Special Issue Editors


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Guest Editor
Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
Interests: nanomaterials; lipid nanoparticles and other nanocarriers; heterogeneous catalysis; cosmetic chemistry; analytical chemistry
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Special Issue Information

Dear Colleagues,

Currently, the scientific community has been placing increasing emphasis on the introduction of innovative catalyst-based technologies to improve environmental quality. The synthesis and appropriate characterization of new materials make it possible, among other things, to use them in photocatalytic processes, in biological products, or to obtain high-value chemicals. Because of the above, scientists are interested in obtaining the appropriate surface modification of materials.

This special issue focuses on the design, synthesis, and modification of catalyst materials at the molecular level. And recent developments in synthesizing, functionalizing, and applying effective porous materials in catalytic processes, including zeolites, mesoporous materials, and so on, the emphasis is on research at the mechanism and molecular levels. These materials are of interest because of their wide variations in chemical composition and methods of obtaining them, as well as their potential applications.

We cordially encourage you to submit research articles and reviews for this Special Issue to share your work, knowledge, insights, and recent accomplishments.

Dr. Agnieszka Feliczak-Guzik
Prof. Dr. Izabela Nowak
Guest Editors

Manuscript Submission Information

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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. International Journal of Molecular Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. There is an Article Processing Charge (APC) for publication in this open access journal. For details about the APC please see here. 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

  • surface modification
  • heterogeneous and homogenous catalysis
  • surface/texture chemistry
  • physicochemical characterization of catalytic materials
  • the applications of catalysts, for example, in environmental processes

Published Papers (5 papers)

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Research

14 pages, 2387 KiB  
Article
Studies on the Application of PGM Nanocatalysts from Spent Automotive Converters for Degradation of Ibuprofen in Aqueous Solutions
by Zuzanna Wolańczyk, Wiktoria Stachowicz, Martyna Rzelewska-Piekut, Joanna Zembrzuska and Magdalena Regel-Rosocka
Int. J. Mol. Sci. 2024, 25(6), 3147; https://doi.org/10.3390/ijms25063147 - 9 Mar 2024
Viewed by 675
Abstract
There is an increasing concern about the presence of various types of pharmaceuticals in drinking water, as long-term exposure of people to even low concentrations of drugs can lead to many problems, such as endocrine disorders or drug resistance. As the removal in [...] Read more.
There is an increasing concern about the presence of various types of pharmaceuticals in drinking water, as long-term exposure of people to even low concentrations of drugs can lead to many problems, such as endocrine disorders or drug resistance. As the removal in sewage treatment plants is not effective enough, as indicated, among others, by the EC and OECD reports, it is justified to search for new materials that will allow for an effective and rapid reduction of these pollutants in water. Therefore, in our work, catalytically active nanomaterials containing platinum group metals (PGMs) were synthesized from model and real multicomponent solutions and examined in reactions of organic compounds. The nanoparticles (NPs) were obtained from real solutions from the hydrometallurgical processing of spent automotive converters (SACs), and to the best of our knowledge, the novelty of the proposed paper is the application of solutions from SAC processing as precursors for PGM–NPs. The synthesized PGM–NPs were deposited on a support (TiO2), characterized and, finally, examined as nanocatalysts in a degradation reaction of ibuprofen (IB) from model aqueous solutions. The degree of IB degradation reached more than 90%. The main products of IB degradation were p-isobutylphenol and CO2. Full article
(This article belongs to the Special Issue Design, Synthesis, and Modification of Efficient Catalyst Materials)
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22 pages, 6593 KiB  
Article
Design and Synthesis of N-Doped Carbons as Efficient Metal-Free Catalysts in the Hydrogenation of 1-Chloro-4-Nitrobenzene
by Juan-José Villora-Picó, Antonio Sepúlveda-Escribano and María-Mercedes Pastor-Blas
Int. J. Mol. Sci. 2024, 25(5), 2515; https://doi.org/10.3390/ijms25052515 - 21 Feb 2024
Viewed by 793
Abstract
Metal-free catalysts based on nitrogen-doped porous carbons were designed and synthesized from mixtures of melamine as nitrogen and carbon sources and calcium citrate as carbon source and porogen system. Considering the physicochemical and textural properties of the prepared carbons, a melamine/citrate ratio of [...] Read more.
Metal-free catalysts based on nitrogen-doped porous carbons were designed and synthesized from mixtures of melamine as nitrogen and carbon sources and calcium citrate as carbon source and porogen system. Considering the physicochemical and textural properties of the prepared carbons, a melamine/citrate ratio of 2:1 was selected to study the effect of the pyrolysis temperature. It was observed that a minimum pyrolysis temperature of 750 °C is required to obtain a carbonaceous structure. However, although there is a decrease in the nitrogen amount at higher pyrolysis temperatures, a gradual development of the porosity is produced from 750 °C to 850 °C. Above that temperature, a deterioration of the carbon porous structure is produced. All the prepared carbon materials, with no need for a further activation treatment, were active in the hydrogenation reaction of 1-chloro-4-nitrobenzene. A full degree of conversion was reached with the most active catalysts obtained from 2:1 melamine/citrate mixtures pyrolyzed at 850 °C and 900 °C, which exhibited a suitable compromise between the N-doping level and developed mesoporosity that facilitates the access of the reactants to the catalytic sites. What is more, all the materials showed 100% selectivity for the hydrogenation of the nitro group to form the corresponding chloro-aniline. Full article
(This article belongs to the Special Issue Design, Synthesis, and Modification of Efficient Catalyst Materials)
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14 pages, 4684 KiB  
Article
Modification of Glassy Carbon Electrodes with Complexes of Manganese(II) with Some Phenanthroline Derivatives Immobilized in Nafion Layer
by Danuta Tomczyk and Piotr Seliger
Int. J. Mol. Sci. 2024, 25(4), 2348; https://doi.org/10.3390/ijms25042348 - 16 Feb 2024
Viewed by 581
Abstract
Manganese(II) complexes with phenanthroline derivatives modified with different substituents were synthesized and incorporated into Nafion layers covering the surfaces of glassy carbon electrodes and were studied electrochemically. Formal potentials and apparent diffusion coefficients were calculated and discussed. The suitability for electrocatalytic oxidation of [...] Read more.
Manganese(II) complexes with phenanthroline derivatives modified with different substituents were synthesized and incorporated into Nafion layers covering the surfaces of glassy carbon electrodes and were studied electrochemically. Formal potentials and apparent diffusion coefficients were calculated and discussed. The suitability for electrocatalytic oxidation of ascorbic acid and glycolic acid was examined. The surfaces of modified electrodes were characterized using atomic force microscopy. Full article
(This article belongs to the Special Issue Design, Synthesis, and Modification of Efficient Catalyst Materials)
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13 pages, 6424 KiB  
Article
Mesocellular Silica Foam as Immobilization Carrier for Production of Statin Precursors
by Dino Skendrović, Mateja Primožič, Tonči Rezić and Ana Vrsalović Presečki
Int. J. Mol. Sci. 2024, 25(4), 1971; https://doi.org/10.3390/ijms25041971 - 6 Feb 2024
Viewed by 622
Abstract
The employment of 2-deoxyribose-5-phosphate aldolase (DERA) stands as a prevalent biocatalytic route for synthesizing statin side chains. The main problem with this pathway is the low stability of the enzyme. In this study, mesocellular silica foam (MCF) with different pore sizes was used [...] Read more.
The employment of 2-deoxyribose-5-phosphate aldolase (DERA) stands as a prevalent biocatalytic route for synthesizing statin side chains. The main problem with this pathway is the low stability of the enzyme. In this study, mesocellular silica foam (MCF) with different pore sizes was used as a carrier for the covalent immobilization of DERA. Different functionalizing and activating agents were tested and kinetic modeling was subsequently performed. The use of succinic anhydride as an activating agent resulted in an enzyme hyperactivation of approx. 140%, and the stability almost doubled compared to that of the free enzyme. It was also shown that the pore size of MCF has a decisive influence on the stability of the DERA enzyme. Full article
(This article belongs to the Special Issue Design, Synthesis, and Modification of Efficient Catalyst Materials)
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20 pages, 3511 KiB  
Article
SBA-15- and SBA-16-Functionalized Silicas as New Carriers of Niacinamide
by Agata Wawrzyńczak, Izabela Nowak and Agnieszka Feliczak-Guzik
Int. J. Mol. Sci. 2023, 24(24), 17567; https://doi.org/10.3390/ijms242417567 - 17 Dec 2023
Viewed by 953
Abstract
Amorphous silica as a food additive (E 551) is used in food materials (e.g., sweeteners, dairy products) for its anti-caking properties. The physicochemical properties of SiO2 also make it suitable to serve as a carrier of active substances in functional foods, dietary [...] Read more.
Amorphous silica as a food additive (E 551) is used in food materials (e.g., sweeteners, dairy products) for its anti-caking properties. The physicochemical properties of SiO2 also make it suitable to serve as a carrier of active substances in functional foods, dietary supplements, and drugs. Deficiency of niacinamide (vitamin B3, niacin) leads to several pathologies in the nervous system and causes one of the nutritional diseases called pellagra. The present study focuses on the use of hybrid ordered mesoporous silicas (SBA-15/SBA-16) functionalized with amino groups introduced through grafting or co-condensation with (N-vinylbenzyl)aminoethylaminopropyltrimethoxysilane (Z-6032) as novel carriers of niacinamide. They combine the characteristics of a relatively stable and chemically inert amorphous silica matrix with well-defined structural/textural parameters and organic functional groups that give specific chemical properties. The highest degree of carrier loading with niacinamide (16 wt.%) was recorded for the unmodified SBA-15. On the other hand, the highest degree of niacinamide release characterizes the functionalized SBA-15 sample (60% after 24 h), indicating that the presence of amino groups affects the release profile of niacinamide from the structure of the mesoporous silica. Full article
(This article belongs to the Special Issue Design, Synthesis, and Modification of Efficient Catalyst Materials)
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