Submit to Special Issue Submit Abstract to Special Issue Review for Catalysts Propose a Special Issue

Journal Menu

Journal Browser

► Journal Browser

Special Issue "Catalysts and Photocatalysts Based on Mixed Metal Oxides"

Special Issue Editors
Special Issue Information
Keywords
Published Papers

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

Deadline for manuscript submissions: 31 October 2023 | Viewed by 6384

Share This Special Issue

Special Issue Editors

Prof. Dr. Alexander Kokorin

E-Mail Website
Guest Editor

N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, Kosygin st. 4, 119991 Moscow, Russia
Interests: catalysis; photocatalysis; metal oxides; doping; nano-semiconductors; EPR sprctroscopy

Prof. Dr. Detlef W. Bahnemann

E-Mail Website
Guest Editor

Laboratory of Photoactive Nanocomposite Materials, Saint-Petersburg State University, Ulyanovskaya Str. 1, Peterhof, 198504 Saint-Petersburg, Russia
Interests: photocatalysis; self-cleaning; superhydrophilic; antibacterial surfaces; metal and semiconductor particles; nanocristalyne transparent coatings; functional test according to DIN; CEN and ISO
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

It is well-known that in many practical applications and in fundamental research metal oxides have an extremely important role in heterogeneous catalysis. During the last two decades, they have also been used as nanostructured semiconductor photocatalysts. Doped and bare mixed oxides are based mainly on titanium dioxide, TiO₂, and other transition metal complexes have revealed interesting features as self-cleaning, effective anti-bacterial and detoxicant materials. Every year, hundreds of new original articles and several reviews are published in leading scientific journals.

This Special Issue of Catalysts is dedicated to novel trends in the synthesis, characterization, properties, functional activity, and applications of mixed metal oxides of different types active in catalytic and photocatalytic reactions and processes. In this Special Issue we intend to gather specialists in chemistry, photochemistry, chemical catalysis, as well as photo- and photoelectrocatalysis. The Issue will include both original reports and short focused review papers to stimulate further developments in these fields. Given your innovative work in this area, we are convinced that your contribution is essential for the success of this project. It would also bring attention to the broader catalytic/photocatalytic community to the growing field of novel trends in practical aspects of the area.

Prof. Dr. Alexander Kokorin
Prof. Dr. Detlef W. Bahnemann
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

catalysis
photocatalysis
metal oxides
doping
structure
properties
physical methods

Published Papers (7 papers)

Download All Papers

Order results

Result details

Show export options Show export options

Select all

Export citation of selected articles as:

Research

Open AccessFeature PaperArticle

Cryogels from Pt/γ-Fe₂O₃ and Pd/γ-Fe₂O₃ NPs as Promising Electrocatalysts for Ethanol Oxidation Reaction

and

Catalysts 2023, 13(7), 1074; https://doi.org/10.3390/catal13071074 - 06 Jul 2023

Viewed by 587

Abstract

Cryogels from noble metal NPs have proven to be highly efficient catalysts due to their high specific surface area which increases the mass transfer channels and catalytic active sites. By using metal oxides as co-catalysts, the costs of the material can be significantly reduced, while the catalytic activity can remain the same or even improve due to synergetic effects. In this work, we synthesize different cryogel thin films supported on modified ITO substrates from Pt, Pd nanoparticles (NPs), and mixtures of these noble metals with γ-Fe₂O₃ NPs in a very low concentration (1 wt% of the noble metal). Structural and elemental analysis of the samples are performed, along with the measurement and analysis of their catalytic activity. The electrocatalytic activity of the cryogels towards ethanol oxidation reaction (EOR) in alkaline media was evaluated by means of cyclic voltammetry. By mixing γ-Fe₂O₃ NPs with Pt or Pd NPs in the cryogel structure, we observe increased tolerance against poisonous surface intermediates produced during the EOR. Moreover, we observe an increase in the catalytic activity towards EOR in the case of the 1 wt% Pd/γ-Fe₂O₃ cryogel, making them promising materials for the development of direct ethanol fuel cells. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Graphical abstract

Open AccessFeature PaperArticle

Photodeposition of Hydroxyapatite into a Titanium Dioxide Nanotubular Layer Using Ca(EDTA) Complex Decomposition

Veronika Yu. Yurova

Polina I. Zyrianova

Pavel V. Nesterov

Vyacheslav V. Goncharov

Ekaterina V. Skorb

and

Sviatlana A. Ulasevich

Catalysts 2023, 13(6), 993; https://doi.org/10.3390/catal13060993 - 09 Jun 2023

Viewed by 693

Abstract

A new photocatalytic hydroxyapatite (HA) synthesis method has been developed. This method is based on the unique ability of the TiO₂ photocatalyst to decompose the Ca(EDTA) complex under UV illumination. As a result, released Ca²⁺ ions react with PO₄³⁻ ions forming the HA particles. The photocatalytic formation of hydroxyapatite is found to have a fractional order, which may indicate the complex reaction mechanism and the presence of several limiting stages. The TNT-HA samples were studied by XRD, FTIR, SEM, GDOES, and biocompatibility study. High biocompatibility of the surfaces is proven by pre-osteoblast cell growth. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Graphical abstract

Open AccessArticle

Photocatalytic and Antimicrobial Activity of TiO₂ Films Deposited on Fiber-Cement Surfaces

Antonio Otavio T. Patrocinio

and

João A. Rossignolo

Catalysts 2023, 13(5), 861; https://doi.org/10.3390/catal13050861 - 09 May 2023

Viewed by 1049

Abstract

In this study, TiO₂ films were deposited via the doctor blade technique on fiber-cement surfaces. Two types of nanoparticles (TiO₂-P25 from Degussa and TiO₂-PC105 from Tronox) were used to produce films. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) images revealed films with homogeneous and nanoparticulated morphology. The TiO₂ PC105 film presented a lower roughness parameter (RMS) in relation to that of the TiO₂ P25-based film. Both films exhibited high hydrophilicity when exposed to UV-A radiation (contact angle θ < 6°). The photocatalytic activity of the films was evaluated by standardized methylene blue dye degradation assays under UV-A irradiation (1.0 mW/cm²). The TiO₂-PC105 film showed a photonic efficiency of ξ = 0.1%, while for the films obtained with TiO₂-P25, ξ = 0.08%. The cement surface modified with the PC105 film was evaluated for antimicrobial activity through the use of multiple pathogens commonly found in hospitals. A considerably high efficiency was measured with visible light. Growth inhibition rates of 99.0% ± 0.2, 99.1% ± 0.2, 99.1% ± 0.2, 97.5% ± 0.5, 98.0% ± 0.5 and 98.0% ± 0.5 were found for Staphylococcus aureus, Klebsiella sp., Escherichia coli, Rhizobium sp., Fusarium sp. and Penicillium sp., respectively. The results show the self-cleaning ability and their potential use for protection, by preventing contamination of the fiber-cement surface and opening new possibilities for the use of this building material. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Figure 1

Open AccessArticle

Enhanced Titania Photocatalyst on Magnesium Oxide Support Doped with Molybdenum

Anatoly Kulak

and

Alexander Kokorin

Catalysts 2023, 13(3), 454; https://doi.org/10.3390/catal13030454 - 21 Feb 2023

Viewed by 787

Abstract

Titania photocatalysts supported on mesoporous MgO carriers doped with Mo(VI) ions were prepared and characterized by XRD, BET nitrogen adsorption, FT-IR, and EPR methods. The photocatalytic activity was evaluated by bleaching an aqueous dye solution in the presence of a dispersed photocatalyst and by bleaching the dry surface of a solid tablet of photocatalyst using rhodamine B and nigrosin as model organic pollutants. It was established that TiO₂ photocatalyst based on MgO carrier doped with 1 wt.% Mo(VI) ions, with the ratio of MgO:TiO₂ = 1:0.5, possessed the highest activity under UV radiation. The increase in the content of molybdenum up to 10 wt.% leads to the formation of a MoO₃ nanophase on the MgO surface, the formation of an isotype n–n heterojunction at the MoO₃/TiO₂ interface, and photocatalytic activity under the action of visible light. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Graphical abstract

Open AccessArticle

Template-Assisted SnO₂: Synthesis, Composition, and Photoelectrocatalytical Properties

and

Catalysts 2023, 13(1), 168; https://doi.org/10.3390/catal13010168 - 11 Jan 2023

Viewed by 945

Abstract

A series of tin oxides were synthesized with polystyrene microspheres (250 nm) as the template. It was shown that an increase in the template content led to increasing specific pore volume and to the formation of bimodal pore structure with pores of 9 and 70 nm in diameter. Addition of cetyltrimethylammonium bromide (CTAB) during synthesis led to the formation of friable structures (SEM data), to an increase in the average pore diameter from 19 to 111 nm, and to the formation of macropores of 80–400 nm in size. All materials had similar surface properties and cassiterite structure with 5.9–10.8 nm coherent scattering region (XRD data). Flat-band potentials of the samples were determined and their photoelectrocatalytic properties to oxidation of water and methanol were studied in the potential range of 0.4–1.6 V RHE. It was shown that the sample obtained using CTAB was characterized by lower flat-band potential value, but appeared significantly higher photocurrent in methanol oxidation, which resulted from enhanced macro-meso-porous structure to facilitate methanol pore diffusion. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Graphical abstract

Open AccessArticle

Synthesis of Catalytic Precursors Based on Mixed Ni-Al Oxides by Supercritical Antisolvent Co-Precipitation

and

Catalysts 2022, 12(12), 1597; https://doi.org/10.3390/catal12121597 - 06 Dec 2022

Cited by 2 | Viewed by 955

Abstract

Mixed Ni-Al oxide catalytic precursors with different elemental ratios (20, 50, and 80 wt.% Ni⁰) were synthesized using green supercritical antisolvent co-precipitation (SAS). The obtained oxide precursors and metal catalysts were characterized in detail by X-ray diffraction (XRD) analysis, atomic pair distribution function (PDF) analysis, CO adsorption, and high-resolution transmission electron microscopy (HRTEM). It was found that the composition and structure of the Ni-Al precursors are related to the Ni content. The mixed Ni_1−xAl_xO oxide with NiO-based crystal structure was formed in the Ni-enriched sample, whereas the highly dispersed NiAl₂O₄ spinel was observed in the Al-enriched sample. The obtained metal catalysts were tested in the process of anisole H₂-free hydrogenation. 2-PrOH was used as a hydrogen donor. The catalyst with 50 wt.% Ni⁰ demonstrated the highest activity in the hydrogenation process. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Graphical abstract

Open AccessArticle

Influence of the LaMn_1−xFe_xO₃ (x = 0–1) Composition on Catalytic Activities in the Reactions Involving Oxygen

and

Catalysts 2022, 12(12), 1563; https://doi.org/10.3390/catal12121563 - 02 Dec 2022

Viewed by 633

Abstract

Perovskite samples of the LaMn_1−xFe_xO₃ (x = 0–1) series were prepared by the Pechini method; their physicochemical properties were studied using XRD, HRTEM, XPS, and BET, and their catalytic activity was estimated in nitrous oxide decomposition and methane and CO oxidation reactions. In methane and CO oxidation reactions, all intermediate (0 < x < 1) samples of the series exhibited a lower catalytic activity normalized to the unit surface area as compared to the extreme terms, whereas in the nitrous oxide decomposition all intermediate samples were more active than extreme terms of the series. Different dependences of activities on the composition obtained in the study for the tested reactions involving the catalyst oxygen are caused by differences in the reaction mechanisms. Full article

(This article belongs to the Special Issue Catalysts and Photocatalysts Based on Mixed Metal Oxides)

► Show Figures

Journal Menu

Journal Browser

Special Issue "Catalysts and Photocatalysts Based on Mixed Metal Oxides"

Share This Special Issue

Special Issue Editors

Special Issue Information

Keywords

Published Papers (7 papers)

Research

Further Information

Guidelines

MDPI Initiatives

Follow MDPI