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Catalysts
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Catalysis by Silica and Related Materials
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Catalysis by Silica and Related Materials

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

Deadline for manuscript submissions: closed (31 December 2020) | Viewed by 13637

Special Issue Editors

Prof. Dr. Antonia Infantes-Molina

E-Mail Website
Guest Editor
Department of Inorganic Chemistry, Crystallography and Mineralogy, University of Malaga, 29071 Malaga, Spain
Interests: nanomaterials; catalysis; environment; clean energy
Special Issues, Collections and Topics in MDPI journals
Dr. Elisa Moretti

E-Mail Website
Guest Editor
Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca’ Foscari Venezia, Via Torino 155, 30172 Mestre Venezia, Italy.
Interests: nanostructured materials; multi-component oxide systems with controlled porosity and morphology; environmental/energy catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Silica and silica-based materials have been of paramount importance in the field of catalysis for some decades and have been widely used both as catalysts and catalytic supports in a large variety of processes. As a matter of fact, amorphous, mesoporous, and zeolitic silica-based materials give rise to a vast array of catalytically active materials, as they can be functionalized on the surface, can incorporate heteroatoms in the structures or nanoparticles and organic molecules inside the pores, and their textural and morphological properties can be tuned depending on the application. Therefore, these materials are considered to have excellent versatility in the field of catalysis.

This Special Issue focuses on recent advances in silica and silica-related materials with applications in catalysis, mainly catalytic and photocatalytic applications of great environmental and/or industrial interest.

We invite you to submit manuscripts for this Special Issue, including communications, full papers, and reviews, that take into account any of the previously described aspects.

Dr. Antonia Infantes-Molina
Prof. Elisa Moretti
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

  • silica
  • silica-related materials
  • catalysis
  • photocatalysis
  • surface characterization
  • silica functionalization
  • hybrid materials

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Published Papers (4 papers)

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Research

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15 pages, 2208 KiB  
Article
Amino-Modified Silica as Effective Support of the Palladium Catalyst for 4-Nitroaniline Hydrogenation
by Adele R. Latypova, Maxim D. Lebedev, Evgeniy V. Rumyantsev, Dmitry V. Filippov, Olga V. Lefedova, Alexey V. Bykov and Valentin Yu. Doluda
Catalysts 2020, 10(4), 375; https://doi.org/10.3390/catal10040375 - 31 Mar 2020
Cited by 6 | Viewed by 3485
Abstract
The article describes the synthesis of aminoorgano-functionalized silica as a prospective material for catalysis application. The amino groups have electron donor properties which are valuable for the metal chemical state of palladium. Therefore, the presence of electron donor groups is important for increasing [...] Read more.
The article describes the synthesis of aminoorgano-functionalized silica as a prospective material for catalysis application. The amino groups have electron donor properties which are valuable for the metal chemical state of palladium. Therefore, the presence of electron donor groups is important for increasing catalysts’ stability. The research is devoted to the investigation of silica amino-modified support influence on the activity and stability of palladium species in 4-nitroaniline hydrogenation process. A series of catalysts with different supports such as SiO2, SiO2-C3H6-NH2 (amino-functionalized silica), γ-Al2O3 and activated carbon were studied. The catalytic activity was studied in the hydrogenation of 4-nitroaniline to 1,4-phenylenediamine. The catalysts were characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy and chemisorption of hydrogen by the pulse technique. The 5 wt.% Pd/SiO2-C3H6-NH2 catalyst exhibited the highest catalytic activity for 4-nitroaniline hydrogenation with 100% conversion and 99% selectivity with respect to 1,4-phenylenediamine. Full article
(This article belongs to the Special Issue Catalysis by Silica and Related Materials)
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18 pages, 6968 KiB  
Article
Effects of Lanthanide Doping on the Catalytic Activity and Hydrothermal Stability of Cu-SAPO-18 for the Catalytic Removal of NOx (NH3-SCR) from Diesel Engines
by Qi Gao, Shuai Han, Qing Ye, Shuiyuan Cheng, Tianfang Kang and Hongxing Dai
Catalysts 2020, 10(3), 336; https://doi.org/10.3390/catal10030336 - 17 Mar 2020
Cited by 16 | Viewed by 3302
Abstract
Lanthanide (La, Ce, Nd, Gd, Tb, Ho or Lu)-doped Cu-SAPO-18 samples were prepared using the ion-exchange method. Physicochemical properties of the samples were systematically characterized by a number of analytical techniques, and the effects of lanthanide doping on catalytic activity and hydrothermal stability [...] Read more.
Lanthanide (La, Ce, Nd, Gd, Tb, Ho or Lu)-doped Cu-SAPO-18 samples were prepared using the ion-exchange method. Physicochemical properties of the samples were systematically characterized by a number of analytical techniques, and the effects of lanthanide doping on catalytic activity and hydrothermal stability of the Cu-SAPO-18 catalysts for the NH3-SCR reaction were examined. It is shown that the doping of lanthanide elements could affect the interaction between the active components (copper ions) and the AEI-structured SAPO-18 support. The inclusion of some lanthanides significantly slowed down hydrolysis of the catalyst during hydrothermal aging treatment process, leading to an enhanced catalytic activity at both low and high temperatures and hydrothermal stability. In particular, Ce doping promoted the Cu2+ ions to migrate to the energetically favorable sites for enhancement in catalytic activity, whereas the other lanthanide ions exerted little or an opposite effect on the migration of Cu2+ ions. Additionally, Ce doping could improve hydrothermal stability of the Cu-SAPO-18 catalyst by weakening hydrolysis of the catalyst during the hydrothermal aging treatment process. Ce doping increased the catalytic activity of Cu-SAPO-18 at low and high temperatures, which was attributed to modifications of the redox and/or isolated Cu2+ active centers. Full article
(This article belongs to the Special Issue Catalysis by Silica and Related Materials)
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16 pages, 3262 KiB  
Article
Efficient Production of Medium-Chain Structured Phospholipids over Mesoporous Organosulfonic Acid-Functionalized SBA-15 Catalysts
by Jianghua Zhang, Shasha Yang, Weijie Cai, Fawen Yin, Jin Jia, Dayong Zhou and Beiwei Zhu
Catalysts 2019, 9(9), 770; https://doi.org/10.3390/catal9090770 - 13 Sep 2019
Cited by 10 | Viewed by 2848
Abstract
It is highly desirable that efficient recoverable heterogeneous catalysts should be developed to replace the costly biocatalysts used in producing structured phospholipids (SPLs) with medium-chain fatty acids (MCFAs). Thus, mesoporous propyl and phenyl sulfonic acid-functionalized SBA-15 materials synthesized via surface modification methods were [...] Read more.
It is highly desirable that efficient recoverable heterogeneous catalysts should be developed to replace the costly biocatalysts used in producing structured phospholipids (SPLs) with medium-chain fatty acids (MCFAs). Thus, mesoporous propyl and phenyl sulfonic acid-functionalized SBA-15 materials synthesized via surface modification methods were investigated for the soybean lecithin interesterification with methyl caprate or caprylate. The physicochemical properties of the synthesized solid acids were deeply studied by small-angle X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared and pyridine adsorption, etc. to build the possible structure–performance relationships. The results revealed that amounts of organosulfonic acid groups were successfully grafted onto the SBA-15 support, and most of the surface acid sites contained in the as-prepared organic–inorganic hybrid samples were assigned as strong Brӧnsted acid sites. Notably, the functionalized SBA-15 materials exhibited promising catalytic behaviors in producing MCFA-enriched SPLs under mild conditions (40 °C, 6 h) when compared with commercial Amberlyst-15 and typical phospholipases or lipases, mostly due to their high surface area, ordered structure and adequate Brӧnsted acid sites. Besides, the as-prepared materials could be easily recycled five times without obvious deactivation. This work might shed light on alternative catalysts for SPL production instead of the costly enzymes. Full article
(This article belongs to the Special Issue Catalysis by Silica and Related Materials)
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Review

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21 pages, 398 KiB  
Review
Silica-Related Catalysts for CO2 Transformation into Methanol and Dimethyl Ether
by Isabel Barroso-Martín, Antonia Infantes-Molina, Fatemeh Jafarian Fini, Daniel Ballesteros-Plata, Enrique Rodríguez-Castellón and Elisa Moretti
Catalysts 2020, 10(11), 1282; https://doi.org/10.3390/catal10111282 - 4 Nov 2020
Cited by 5 | Viewed by 3413
Abstract
The climate situation that the planet is experiencing, mainly due to the emission of greenhouse gases, poses great challenges to mitigate it. Since CO2 is the most abundant greenhouse gas, it is essential to reduce its emissions or, failing that, to use [...] Read more.
The climate situation that the planet is experiencing, mainly due to the emission of greenhouse gases, poses great challenges to mitigate it. Since CO2 is the most abundant greenhouse gas, it is essential to reduce its emissions or, failing that, to use it to obtain chemicals of industrial interest. In recent years, much research have focused on the use of CO2 to obtain methanol, which is a raw material for the synthesis of several important chemicals, and dimethyl ether, which is advertised as the cleanest and highest efficiency diesel substitute fuel. Given that the bibliography on these catalytic reactions is already beginning to be extensive, and due to the great variety of catalysts studied by the different research groups, this review aims to expose the most important catalytic characteristics to take into account in the design of silica-based catalysts for the conversion of carbon dioxide to methanol and dimethyl ether. Full article
(This article belongs to the Special Issue Catalysis by Silica and Related Materials)
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