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Catalysts
Special Issues
Porous Catalytic Materials: Synthesis, Characterization and Applications
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Porous Catalytic Materials: Synthesis, Characterization and Applications

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

Deadline for manuscript submissions: closed (30 December 2021) | Viewed by 7059

Special Issue Editors

Dr. Eugenio Meloni

E-Mail Website
Guest Editor
Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy
Interests: heterogeneous catalysis; soot abatement; process intensification; catalytic filters for soot abatement; microwave-assisted processes; hydrogen production; structured catalysts preparation and characterization; non-thermal plasma; steam reforming; dry reforming; water gas shift
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Stanislaw Dzwigaj

E-Mail Website
Guest Editor
Laboratoire de Réactivité de Surface, Sorbonne Université-CNRS, UMR 7197 Campus Pierre et Marie Curie, 4, Place Jussieu, 75252 Paris, France
Interests: heterogeneous catalysis; environmental catalysis; surface reactivity; inorganic chemistry; spectroscopies; nanomaterials; nanoscience; porous materials; zeolites; valorization of biomass
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

 

In the last years, many efforts of the scientific community have been focused on a deeper knowledge in porous materials, in order to better understand how porosity and chemical nature may influence their final properties and performances in heterogeneous catalysis. The development of new catalysts and improvement of existing ones for complex processes given both productive and ecological catalysis is based on the purposeful design of spatially organized structures with given functional characteristics. The most effective catalysts for these processes are characterized by an optimum combination of functional sites on the surface. The realization of such complex processes requires the presence of various types of active sites, in particular oxidation–reduction and acid–base sites. Porous materials are widely used as model catalysts for investigation of surface acid-base properties on their activity.

This Special Issue is focused on “Porous Catalytic Materials: Synthesis, Characterization and Applications”, featuring the state-of-the-art in this field. Research paper or reviews related to the most relevant results regarding the sustainable aspects of the porous materials, including synthesis, treatment, and catalytic application, are welcome to this Special Issue.

 

Dr. Eugenio Meloni
Prof. Dr. Stanislaw Dzwigaj
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

porous materials

structured catalysts

sustainable catalysis

catalytic formulations

catalytic morphologies

oxidation–reduction sites

acid–base sites

Published Papers (3 papers)

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Research

21 pages, 7353 KiB  
Article
Hierarchical Graphitic Carbon-Encapsulating Cobalt Nanoparticles for Catalytic Hydrogenation of 2,4-Dinitrophenol
by Hassan H. Hammud, Hassan Traboulsi, Ranjith Kumar Karnati, Syed Ghazanfar Hussain and Esam M. Bakir
Catalysts 2022, 12(1), 39; https://doi.org/10.3390/catal12010039 - 30 Dec 2021
Cited by 6 | Viewed by 1843
Abstract
Cobalt hierarchical graphitic carbon nanoparticles (Co@HGC) (1), (2), and (3) were prepared by simple pyrolysis of a cobalt phenanthroline complex in the presence of anthracene at different temperatures and heating times, under a nitrogen atmosphere. The samples [...] Read more.
Cobalt hierarchical graphitic carbon nanoparticles (Co@HGC) (1), (2), and (3) were prepared by simple pyrolysis of a cobalt phenanthroline complex in the presence of anthracene at different temperatures and heating times, under a nitrogen atmosphere. The samples were used for the catalytic hydrogenation of 2,4-dinitrophenol. Samples (1) and (3) were prepared by heating at 600 °C and 800 °C respectively, while (2) was prepared by heating at 600 °C with an additional intermediate stage at 300 °C. This work revealed that graphitization was catalyzed by cobalt nanoparticles and occurred readily at temperatures of 600 °C and above. The nanocatalysts were characterized by Scanning Electron Microscopy SEM, energy dispersive X-ray analysis EDX, Raman, Xrd, and XPS. The analysis revealed the presence of cobalt and cobalt oxide species as well as graphitized carbon, while TEM analysis indicated that the nanocatalyst contains mainly cobalt nanoparticles of 3–20 nm in size embedded in a lighter graphitic web. Some bamboo-like multiwall carbon nanotubes and graphitic onion-like nanostructures were observed in (3). The structures and chemical properties of the three catalysts were correlated with their catalytic activities. The apparent rate constants kapp (min−1) of the 2,4-dinitrophenol reductions were 0.34 for (2), 0.17 for (3), 0.04 for (1), 0.005 (no catalyst). Among the three studied catalysts, the highest rate constant was obtained for (2), while the highest conversion yield was achieved by (3). Our data show that an increase in agglomeration of the cobalt species reduces the catalytic activity, while an increase in pyrolysis temperature improves the conversion yield. The nanocatalyst enhances hydrogen generation in the presence of sodium borohydride and reduces 2,4-dinitrophenol to p-diamino phenol. The best nanocatalyst (3) was prepared at 800 °C. It consisted of uniformly distributed cobalt nanoparticles sheltered by hierarchical graphitic carbon. The nanocatalyst is easily separated and recycled from the reaction system and proved to be degradation resistant, to have robust stability, and high activity towards the reduction reaction of nitrophenols. Full article
(This article belongs to the Special Issue Porous Catalytic Materials: Synthesis, Characterization and Applications)
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20 pages, 5802 KiB  
Article
Immobilization of TiO2 Nanoparticles in Cement for Improved Photocatalytic Reactivity and Treatment of Organic Pollutants
by Hannah M. McIntyre and Megan L. Hart
Catalysts 2021, 11(8), 938; https://doi.org/10.3390/catal11080938 - 01 Aug 2021
Cited by 3 | Viewed by 2266
Abstract
Non-point organic pollutants in stormwater are a growing problem in the urban environment which lack effective and efficient treatment technologies. Incorporation of conventional wastewater techniques within stormwater management practices could fundamentally change how stormwater quality is managed because contaminants can be degraded during [...] Read more.
Non-point organic pollutants in stormwater are a growing problem in the urban environment which lack effective and efficient treatment technologies. Incorporation of conventional wastewater techniques within stormwater management practices could fundamentally change how stormwater quality is managed because contaminants can be degraded during stormwater transport or storage. This study investigated the photocatalytic reactivity of titanium dioxide functionalized with maleic anhydride (Ti-MAH) within cement pastes when compared to ordinary Portland cement. Preparation of Ti-MAH was performed by permanently bonding maleic anhydride to titanium in methanol, drying and powdering the residual material, and then inter-grinding the preparation with cement during mixing. When compared with OPC, the Ti-MAH cured cement paste is more reactive under a wider range of light wavelengths, possesses a higher band gap, sustains this heightened reactivity over multiple testing iterations, and treats organics effectively (>95% methylene blue removal). Amorphous silica within calcium-silica-hydrate, C-S-H, is theorized to bond to the powdered Ti-MAH during curing. Verification of silicon bonding to the titanium by way of MAH was demonstrated by FTIR spectra, SEM imagery, and XRD. Creating a sustainable and passive photocatalytic cement that precisely bonds silica to Ti-MAH is useful for organic contaminants in urban stormwater, but use can translate to other applications because Ti-MAH bonds readily with any amorphous silica such as glass materials, paints and coatings, optics, and LEDS, among many others. Full article
(This article belongs to the Special Issue Porous Catalytic Materials: Synthesis, Characterization and Applications)
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10 pages, 5440 KiB  
Article
The Isocyanurate-Carbamate-Bridged Hybrid Mesoporous Organosilica: An Exceptional Anchor for Pd Nanoparticles and a Unique Catalyst for Nitroaromatics Reduction
by Ali Zebardasti, Mohammad G. Dekamin and Esmail Doustkhah
Catalysts 2021, 11(5), 621; https://doi.org/10.3390/catal11050621 - 12 May 2021
Cited by 8 | Viewed by 2127
Abstract
Hybridisation of mesoporous organosilicas (MO) to reinforce the surface capability in adsorption and stabilisation of noble metal nanoparticles is of great attention in generating/supporting noble metal within their matrices and transforming them into efficient heterogeneous catalysts. Here, we used a unique hybrid of [...] Read more.
Hybridisation of mesoporous organosilicas (MO) to reinforce the surface capability in adsorption and stabilisation of noble metal nanoparticles is of great attention in generating/supporting noble metal within their matrices and transforming them into efficient heterogeneous catalysts. Here, we used a unique hybrid of organic-inorganic mesoporous silica in which pore profile pattern was similar to the well-known mesoporous silica, SBA-15 for catalysis. This hybrid mesoporous organosilica was further engaged as a support in the synthesis and stabilisation of Pd nanoparticles on its surface, and then, the obtained Pd-supported MO was employed as a heterogeneous green catalyst in the conversion of aqueous p-nitrophenol (PNP) to p-aminophenol (PAP) at room temperature with efficient recyclability. Full article
(This article belongs to the Special Issue Porous Catalytic Materials: Synthesis, Characterization and Applications)
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