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Catalysts
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Exclusive Review Papers in Catalytic Materials
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Exclusive Review Papers in Catalytic Materials

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 18989

Special Issue Editor

Dr. Carolina Belver

E-Mail Website
Guest Editor
Departamento de Ingeniería Química, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
Interests: chemical engineering; materials science; adsorption; photocatalysis; semiconductors; MOFs
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Catalytic materials exist in several forms and can be prepared using various methods involving different schemes and protocols. They can also be applied in many fields, such as in environmental and sustainable catalysis, biomass valorization, renewable fuels production, CO2 recycling, synthetic chemistry, gas storage/capture, drug delivery, catalysis, photocatalysis, chemical sensing, and so on.

This Special Issue aims to collect high-quality review articles in the field of catalytic materials, for which the Editorial Board members of the journal Catalysts, Section “Catalytic Materials”, and other prominent researchers working in the field from all over the world are cordially invited to contribute.

To avoid the overlapping of topics, potential contributors/invited authors are kindly requested to submit a tentative article title and a short description/table of contents to the editor for pre-evaluation.

Prof. Dr. Carolina Belver
Guest Editor

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

  • catalytic materials
  • hybrid materials
  • MOF
  • zeolites and porous materials
  • catalysis for CO2 conversion
  • advanced oxidation catalysts
  • transition metal catalysis
  • homogeneous catalysis
  • nanocatalysis
  • biocatalysis

Published Papers (7 papers)

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Review

27 pages, 3262 KiB  
Review
Enzyme–Iron Oxide Nanoassemblies: A Review of Immobilization and Biocatalytic Applications
by Ángeles Valls-Chivas, Javier Gómez, Jose I. Garcia-Peiro, Felipe Hornos and Jose L. Hueso
Catalysts 2023, 13(6), 980; https://doi.org/10.3390/catal13060980 - 07 Jun 2023
Cited by 5 | Viewed by 1730
Abstract
In the search for new biotechnological advances, increasing attention is currently being paid to the development of magnetic nanoplatforms loaded with enzymes, since, on the one hand, they can be recovered and reused, and on the other hand, they improve their catalytic activity [...] Read more.
In the search for new biotechnological advances, increasing attention is currently being paid to the development of magnetic nanoplatforms loaded with enzymes, since, on the one hand, they can be recovered and reused, and on the other hand, they improve their catalytic activity and increase their stability, avoiding processes such as aggregation or autolysis. In this review, we evaluate a series of key parameters governing the enzyme–nanoparticle immobilization phenomena from a thermodynamic and kinetic point of view. We also focus on the use of magnetite nanoparticles (MNPs) as multifunctional vectors able to anchor enzymes, summarize the most relevant aspects of functionalization and immobilization and, finally, describe some recent and relevant applications of the enzyme–MNP hybrids as biocatalysts with especial emphasis on cancer therapy. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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29 pages, 4570 KiB  
Review
Supported Ni Single-Atom Catalysts: Synthesis, Structure, and Applications in Thermocatalytic Reactions
by Alina D. Nishchakova, Lyubov G. Bulusheva and Dmitri A. Bulushev
Catalysts 2023, 13(5), 845; https://doi.org/10.3390/catal13050845 - 06 May 2023
Cited by 3 | Viewed by 2673
Abstract
Nickel is a well-known catalyst in hydrogenation and dehydrogenation reactions. It is currently used in industrial processes as a homogenous and heterogeneous catalyst. However, to reduce the cost and increase the efficiency of catalytic processes, the development of single-atom catalysts (SACs) seems promising. [...] Read more.
Nickel is a well-known catalyst in hydrogenation and dehydrogenation reactions. It is currently used in industrial processes as a homogenous and heterogeneous catalyst. However, to reduce the cost and increase the efficiency of catalytic processes, the development of single-atom catalysts (SACs) seems promising. Some SACs have already shown increased activity and stability as compared to nanoparticle catalysts. From year to year, the number of reports devoted to nickel SACs is growing rapidly. Among them, there are very few articles devoted to thermal catalysis, but at the same time, this subject is important. Thus, this review discusses recent advances in the synthesis, structure, and application of nickel SACs, mainly in catalytic hydrogenation/dehydrogenation reactions and in the dry reforming of methane. The collected and analyzed data can be useful in the development of novel nickel SACs for various processes. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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Graphical abstract

39 pages, 6102 KiB  
Review
From Fenton and ORR 2e−-Type Catalysts to Bifunctional Electrodes for Environmental Remediation Using the Electro-Fenton Process
by Edgar Fajardo-Puerto, Abdelhakim Elmouwahidi, Esther Bailón-García, Agustín Francisco Pérez-Cadenas and Francisco Carrasco-Marín
Catalysts 2023, 13(4), 674; https://doi.org/10.3390/catal13040674 - 30 Mar 2023
Cited by 4 | Viewed by 2333
Abstract
Currently, the presence of emerging contaminants in water sources has raised concerns worldwide due to low rates of mineralization, and in some cases, zero levels of degradation through conventional treatment methods. For these reasons, researchers in the field are focused on the use [...] Read more.
Currently, the presence of emerging contaminants in water sources has raised concerns worldwide due to low rates of mineralization, and in some cases, zero levels of degradation through conventional treatment methods. For these reasons, researchers in the field are focused on the use of advanced oxidation processes (AOPs) as a powerful tool for the degradation of persistent pollutants. These AOPs are based mainly on the in-situ production of hydroxyl radicals (OH•) generated from an oxidizing agent (H2O2 or O2) in the presence of a catalyst. Among the most studied AOPs, the Fenton reaction stands out due to its operational simplicity and good levels of degradation for a wide range of emerging contaminants. However, it has some limitations such as the storage and handling of H2O2. Therefore, the use of the electro-Fenton (EF) process has been proposed in which H2O2 is generated in situ by the action of the oxygen reduction reaction (ORR). However, it is important to mention that the ORR is given by two routes, by two or four electrons, which results in the products of H2O2 and H2O, respectively. For this reason, current efforts seek to increase the selectivity of ORR catalysts toward the 2e− route and thus improve the performance of the EF process. This work reviews catalysts for the Fenton reaction, ORR 2e− catalysts, and presents a short review of some proposed catalysts with bifunctional activity for ORR 2e− and Fenton processes. Finally, the most important factors for electro-Fenton dual catalysts to obtain high catalytic activity in both Fenton and ORR 2e− processes are summarized. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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26 pages, 3338 KiB  
Review
Oxygen-Deficient Engineering for Perovskite Oxides in the Application of AOPs: Regulation, Detection, and Reduction Mechanism
by Jiayu Yu, Huanhuan Li, Naipeng Lin, Yishu Gong, Hu Jiang, Jiajia Chen, Yin Wang and Xiaodong Zhang
Catalysts 2023, 13(1), 148; https://doi.org/10.3390/catal13010148 - 09 Jan 2023
Cited by 33 | Viewed by 2786
Abstract
A perovskite catalyst combined with various advanced oxidation processes (AOPs) to treat organic wastewater attracted extensive attention. The physical and chemical catalytic properties of perovskite were largely related to oxygen vacancies (OVs). In this paper, the recent advances in the regulation of OVs [...] Read more.
A perovskite catalyst combined with various advanced oxidation processes (AOPs) to treat organic wastewater attracted extensive attention. The physical and chemical catalytic properties of perovskite were largely related to oxygen vacancies (OVs). In this paper, the recent advances in the regulation of OVs in perovskite for enhancing the functionality of the catalyst was reviewed, such as substitution, doping, heat treatment, wet-chemical redox reaction, exsolution, and etching. The techniques of detecting the OVs were also reviewed. An insight was provided into the OVs of perovskite and reduction mechanism in AOPs in this review, which is helpful for the reader to better understand the methods of regulating and detecting OVs in various AOPs. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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Graphical abstract

40 pages, 14099 KiB  
Review
Review of Improving the NOx Conversion Efficiency in Various Diesel Engines fitted with SCR System Technology
by Muhammad Khristamto Aditya Wardana and Ocktaeck Lim
Catalysts 2023, 13(1), 67; https://doi.org/10.3390/catal13010067 - 29 Dec 2022
Cited by 5 | Viewed by 4162
Abstract
The diesel engine is utilized in most commercial vehicles to carry items from various firms; nevertheless, diesel engines emit massive amounts of nitrogen oxides (NOx) which are harmful to human health. A typical approach for reducing NOx emissions from diesel engines is the [...] Read more.
The diesel engine is utilized in most commercial vehicles to carry items from various firms; nevertheless, diesel engines emit massive amounts of nitrogen oxides (NOx) which are harmful to human health. A typical approach for reducing NOx emissions from diesel engines is the selective catalytic reduction (SCR) system; however, several reasons make reducing NOx emissions a challenge: urea particles frequently become solid in the injector and difficult to disseminate across the system; the injector frequently struggles to spray the smaller particles of urea; the larger urea particles from the injector readily cling to the system; it is also difficult to evaporate urea droplets because of the exhaust and wall temperatures (Tw), resulting in an increase in solid deposits in the system, uncontrolled ammonia water solution injection, and NOx emissions problems. The light-duty diesel engine (LDD), medium-duty diesel engine (MDD), heavy-duty diesel engine (HDD), and marine diesel engine use different treatments to optimize NOx conversion efficiency in the SCR system. This review analyzes several studies in the literature which aim to increase NOx conversion in different diesel engine types. The approach and methods demonstrated in this study provide a suitable starting point for future research into reducing NOx emissions from diesel engines, particularly for engines with comparable specifications. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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29 pages, 9190 KiB  
Review
Gold Nanozymes: Smart Hybrids with Outstanding Applications
by Sandra Jimenez-Falcao, Jose M. Méndez-Arriaga, Victoria García-Almodóvar, Antonio A. García-Valdivia and Santiago Gómez-Ruiz
Catalysts 2023, 13(1), 13; https://doi.org/10.3390/catal13010013 - 23 Dec 2022
Cited by 2 | Viewed by 2169
Abstract
Nanozymes are nanostructured artificial enzymes that have attracted great attention among researchers because of their ability to mimic relevant biological reactions carried out by their natural counterparts, but with the capability to overcome natural enzymes’ drawbacks such as low thermostability or narrow substrate [...] Read more.
Nanozymes are nanostructured artificial enzymes that have attracted great attention among researchers because of their ability to mimic relevant biological reactions carried out by their natural counterparts, but with the capability to overcome natural enzymes’ drawbacks such as low thermostability or narrow substrate scope. The promising enzyme-like properties of these systems make nanozymes excellent candidates for innovative solutions in different scientific fields such as analytical chemistry, catalysis or medicine. Thus, nanozymes with different type of activities are of special interest owing to their versatility since they can reproduce several biological reactions according to the substrates and the environmental conditions. In this context, gold-based nanozymes are a representative example of multifunctional structures that can perform a great number of enzyme-like activities. In addition, the combination of gold-based materials with structures of organic and inorganic chemical nature yields even more powerful hybrid nanozymes, which enhance their activity by providing improved features. This review will carry out a deep insight into gold-based nanozymes, revisiting not only the different type of biological enzymatic reactions that can be achieved with these kinds of systems, but also structural features of some of the most relevant hybrid gold-based nanozymes described in the literature. This literature review will also provide a representative picture of the potential of these structures to solve future technological challenges. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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Graphical abstract

15 pages, 4544 KiB  
Review
Heterogeneous Catalysis as an Efficient Tool for Selective Hydrogenation of Oximes to Amines and Hydroxylamines
by Elena A. Redina, Inna I. Ivanova, Natalia Y. Arkhipova and Leonid M. Kustov
Catalysts 2022, 12(12), 1614; https://doi.org/10.3390/catal12121614 - 09 Dec 2022
Cited by 4 | Viewed by 2102
Abstract
The synthesis of many biologically active compounds is not complete without transforming the carbonyl group into an amino group, carried out by the reaction of nucleophilic substitution with hydroxylamine at the carbonyl carbon atom and further reduction of the C–N and N–O bonds. [...] Read more.
The synthesis of many biologically active compounds is not complete without transforming the carbonyl group into an amino group, carried out by the reaction of nucleophilic substitution with hydroxylamine at the carbonyl carbon atom and further reduction of the C–N and N–O bonds. This method eliminates nitrating agents that exhibit oxidizing properties and may cause undesirable effects on other structural fragments of complex molecules. Selective hydrogenation of oximes over heterogeneous catalysts is still one of the most useful and challenging reactions in synthetic organic chemistry to obtain amines and hydroxylamines since the 1920s when the Adam’s catalyst was first used for this reaction. In this review, we focused on the application of heterogeneous catalysts for the hydrogenation of oximes in relation to the methods applied for pharmaceutical synthesis. Full article
(This article belongs to the Special Issue Exclusive Review Papers in Catalytic Materials)
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