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Inorganics
Special Issues
Layered Double Hydroxides for Catalytic Applications
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Layered Double Hydroxides for Catalytic Applications

A special issue of Inorganics (ISSN 2304-6740). This special issue belongs to the section "Inorganic Solid-State Chemistry".

Deadline for manuscript submissions: closed (30 June 2023) | Viewed by 7589

Special Issue Editors

Dr. Haihua Xu

E-Mail Website
Guest Editor
School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Interests: environmental engineering; heterogeneous catalysis; degradation of pharmaceutical pollutants; nanocatalysts for wastewater treatment; functionalized layered double hydroxides application
Dr. Sadaf Mutahir

E-Mail Website
Guest Editor
Department of Chemistry, University of Sialkot, Sialkot, Pakistan
Interests: functional materials; MOFs and MOFs based materials for LIBs; water treatment; clay materials; computational studies
Dr. Sidi Zhu

E-Mail Website
Guest Editor
Department of Chemical and Materials Engineering, University of Alberta, Alberta T6G 1H9, Canada
Interests: nanomaterials; interface science; computer simulation; water treatment; environmental engineering

Special Issue Information

Dear Colleagues,

Layered Double Hydroxides (LDHs) are two-dimensional (2D) anionic clays composed of positively charged M(OH) octahedra in host layers and both anions and water molecules in the interlayer gallery. LDHs have many underlying applications in heterogeneous catalysis owing to their desirable performance, including moderate chemistry stable characteristics, broad specific surface area, high customization possibility and environmental friendliness, relatively simple preparation, and low cost. Besides, LDH-based catalysts are also widely applied as catalysis materials in wastewater treatment.

Therefore, this Special Issue will focus on the recent advances in Catalytic Applications via Layered Double Hydroxides. We invite the submission of original research articles and short critical reviews on themes including, but not limited to:

  • Heterogeneous Catalysis
  • Degradation of Pharmaceutical Pollutants
  • Nanocatalysts for Wastewater Treatment
  • Functionalized Layered Double Hydroxides application

We look forward to receiving your contributions. 

Dr. Haihua Xu
Dr. Sadaf Mutahir
Dr. Sidi Zhu
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. Inorganics 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

  • nanocatalysts
  • pharmaceutical pollutants
  • heterogeneous catalysis
  • wastewater treatment
  • layered double hydroxides

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Published Papers (2 papers)

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Research

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16 pages, 4189 KiB  
Article
Synthesis of CuAl-LDHs by Co-Precipitation and Mechanochemical Methods and Selective Hydrogenation Catalysts Based on Them
by Olga B. Belskaya, Elena N. Terekhova, Oksana V. Gorbunova, Ivan V. Muromtsev, Mikhail V. Trenikhin, Aleksei N. Salanov and Vladimir A. Likholobov
Inorganics 2023, 11(6), 247; https://doi.org/10.3390/inorganics11060247 - 7 Jun 2023
Cited by 7 | Viewed by 3069
Abstract
The paper presents the results of the synthesis and study of CuAl layered double hydroxides (LDHs) as well as their application as catalysts for the selective hydrogenation of crotonaldehyde. Phase-homogeneous LDHs were obtained by co-precipitation and mechanochemical methods, and critical parameters ensuring the [...] Read more.
The paper presents the results of the synthesis and study of CuAl layered double hydroxides (LDHs) as well as their application as catalysts for the selective hydrogenation of crotonaldehyde. Phase-homogeneous LDHs were obtained by co-precipitation and mechanochemical methods, and critical parameters ensuring the formation of the target product were identified. In the case of coprecipitation, the formation of LDH is most affected by the pH of the reaction medium and the CO32−/Al3+ ratio. The optimal CO32−/Al3+ ratio is ca. 0.5–0.8 and pH 9.5–10.0. When mechanochemical synthesis is used, at 500 m·s−2 and 60 min, it is possible to obtain a single-phase CuAl LDH, whereas at higher energies, LDH is destroyed. The mechanochemical method makes it possible not only to reduce the synthesis time and the amount of alkaline wash water but also to obtain more dispersed copper particles with a higher hydrogenating activity. The conversion of 2-butenal (T = 80 °C, P = 0.5 MPa, 180 min, ethanol) for this sample was 99.9%, in contrast to 50.5% for the catalyst obtained by co-precipitation. It is important that, regardless of the conversion, both catalysts showed high selectivity (S = 90–95%) for the double bond hydrogenation. Full article
(This article belongs to the Special Issue Layered Double Hydroxides for Catalytic Applications)
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Review

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22 pages, 5134 KiB  
Review
In Situ Techniques for Characterization of Layered Double Hydroxide-Based Oxygen Evolution Catalysts
by Andraž Mavrič and Matjaž Valant
Inorganics 2023, 11(7), 296; https://doi.org/10.3390/inorganics11070296 - 13 Jul 2023
Cited by 4 | Viewed by 3315
Abstract
Functional layered double hydroxide (LDH) usually contains different cationic substitutes to increase the activity of the oxygen evolution reaction (OER). The intrinsic OER activity of LDH materials is connected with the chemical composition and dispersion of metal cations substitutions in the matrix phase. [...] Read more.
Functional layered double hydroxide (LDH) usually contains different cationic substitutes to increase the activity of the oxygen evolution reaction (OER). The intrinsic OER activity of LDH materials is connected with the chemical composition and dispersion of metal cations substitutions in the matrix phase. The potential induced phase transitions, in particular hydroxide-to-oxyhydroxide transitions, are a predisposition for the high OER activity of LDH materials and can be followed by coupling the electrochemical experiments with spectroscopic techniques. The understanding of LDH catalysts under electrochemical conditions also allows an understanding of the behavior of OER catalysts based on transition metals, metal-chalcogenides, -pnictides, -carbides, and metal–organic frameworks. The surfaces of those materials are intrinsically poor OER catalysts. However, they act as precursors to catalysts, which are oxidized into a metal (oxy)hydroxide. This review summarizes the use of in situ techniques for the characterization of LDH-based OER electrocatalysts and presents the influence of these techniques on the understanding of potential induced phase transitions, identification of active sites, and reaction mechanisms. Full article
(This article belongs to the Special Issue Layered Double Hydroxides for Catalytic Applications)
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