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Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies
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Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies

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

Deadline for manuscript submissions: closed (15 June 2024) | Viewed by 7769

Special Issue Editors

Prof. Dr. Ioan-Cezar Marcu

E-Mail Website
Guest Editor
Laboratory of Chemical Technology and Catalysis, University of Bucharest, 4-12, Blv. Regina Elisabeta, 030018 Bucharest, Romania
Interests: heterogeneous catalysis; catalysis by metal oxides; semiconducting metal oxides; layered double hydroxides and related materials; catalytic oxidation
Special Issues, Collections and Topics in MDPI journals
Dr. Octavian D. Pavel

E-Mail Website
Guest Editor
Faculty of Chemistry, University of Bucharest, 050663 Bucharest, Romania
Interests: base catalysts; fine chemicals synthesis; ionic liquids
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

After the first successful special issue focused on layered double hydroxide-based catalytic materials available here, we propose the second edition titled “Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies”. Layered double hydroxides (LDH) together with their derived materials, such as hybrids, nanocomposites, mixed metal oxides, and supported metals, were shown to be excellent heterogeneous catalysts for a wide range of chemical, photochemical and electrochemical processes. However, they have not had their last word yet! Indeed, due to their great compositional flexibility and ability to intercalate between their nanosheets both organic and inorganic species, new multifunctional catalytic materials can be obtained with practically unlimited applications in various processes resulting in new chemical technologies or the improvement of the existing ones. Thus, the present Special Issue collects original research papers, reviews, and commentaries focused on new and outstanding catalytic applications of all kinds of LDH-based materials.

Prof. Dr. Ioan-Cezar Marcu
Dr. Octavian Dumitru Pavel
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

  • layered double hydroxides
  • LDH-based hierarchically structured catalysts
  • LDH-supported catalysts
  • LDH-derived mixed metal oxides
  • sustainable chemical technologies
  • fine chemical synthesis
  • environmental catalytic technologies
  • catalytic valorization of biomass

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Related Special Issue

Published Papers (6 papers)

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Research

17 pages, 4656 KiB  
Article
Layered Double Hydroxide-Based Composites for Concerted Decontamination of Water
by Qays Al Hasnawi, Sabina Gabriela Ion, Mădălina Tudorache, Octavian Dumitru Pavel and Bogdan Cojocaru
Catalysts 2024, 14(10), 668; https://doi.org/10.3390/catal14100668 - 27 Sep 2024
Viewed by 624
Abstract
A series of composites was prepared starting from five types of LDHs, which were then exchanged with three types of metallo-phthalocyanines, and, in the end, magnetic nanoparticles were attached. In the case of LDHs containing Fe, characterization data showed that there was a [...] Read more.
A series of composites was prepared starting from five types of LDHs, which were then exchanged with three types of metallo-phthalocyanines, and, in the end, magnetic nanoparticles were attached. In the case of LDHs containing Fe, characterization data showed that there was a partial oxidation from Fe2+ to Fe3+. Samples containing evident LDH structures performed better in general than the ones containing iron oxide mixtures, the composites being more active towards amoxicillin removal compared with ampicillin removal. The nature of the phthalocyanine did not have such a great influence, although some differences in the activity were observed. The removal was a combination between adsorption and photocatalytic degradation. The best composites for this application were those based on Mg0.325Fe0.325Al0.25-LDH prepared by co-precipitation in the presence of NaOH and Na2CO3. They presented high adsorption capacity in 10 min and, at the same time, high photocatalytic activity for both amoxicillin and ampicillin. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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17 pages, 3156 KiB  
Article
Benefit of LDH-Derived Mixed Oxides for the Co-Oxidation of Toluene and CO Exhausted from Biomass Combustion
by Caroline Paris, Hadi Dib, Charf Eddine Bounoukta, Eric Genty, Christophe Poupin, Stéphane Siffert and Renaud Cousin
Catalysts 2024, 14(7), 455; https://doi.org/10.3390/catal14070455 - 16 Jul 2024
Viewed by 739
Abstract
The proposed study is devoted to highlighting the importance of mixed oxides preparation through the layered double hydroxide route for undesirable gas pollutants abatement. Different series of Cu/Al/Ce mixed oxides with similar or different stoichiometrics were prepared and compared for toluene and/or CO [...] Read more.
The proposed study is devoted to highlighting the importance of mixed oxides preparation through the layered double hydroxide route for undesirable gas pollutants abatement. Different series of Cu/Al/Ce mixed oxides with similar or different stoichiometrics were prepared and compared for toluene and/or CO oxidation. Catalyst synthesis methods influence material properties and activity for oxidation reactions. The high activity for the oxidation reactions of mixed oxides derived from LDH is explained by the Cu/Ce synergy. The presence of CO in the CO/toluene mixture does not affect the total toluene oxidation, and the toluene does not affect the total oxidation of CO conversion at low temperatures. The most effective catalytic material (Cu6Al1.2Ce0.8) presents a long lifetime stability for total toluene oxidation and resistance to CO poisoning in mixtures. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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12 pages, 3028 KiB  
Article
Mixed Oxides as Catalysts for the Condensation of Cyclohexanol and Benzaldehyde to Obtain a Claisen–Schmidt Condensation Product
by Tanya Stoylkova, Tsveta Stanimirova, Christo D. Chanev, Petya Petrova and Kristina Metodieva
Catalysts 2024, 14(7), 445; https://doi.org/10.3390/catal14070445 - 11 Jul 2024
Viewed by 808
Abstract
Acid–base M2+MgAlO and M2+AlO mixed oxides (where M2+ = Mg, Cu, Co, Zn, and Ni) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors and used as catalysts for cyclohexanol and benzaldehyde condensation under [...] Read more.
Acid–base M2+MgAlO and M2+AlO mixed oxides (where M2+ = Mg, Cu, Co, Zn, and Ni) were obtained by thermal decomposition of the corresponding layered double hydroxide (LDH) precursors and used as catalysts for cyclohexanol and benzaldehyde condensation under solvent-free conditions. The catalysts were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM), and temperature-programmed desorption of CO2 (TPD-CO2). Gas chromatography–mass spectroscopy (GC/MS) was used for the identification and quantification of the product mixtures. In the reaction of cyclohexanol and benzaldehyde on M2+MgAlO and MgAlO catalysts, a 2,6-dibenzylidene-cyclohexanone was obtained as the main product as a result of consecutive one-pot dehydrogenation of cyclohexanol to cyclohexanone and subsequent Claisen–Schmidt condensation. In the reaction mixture obtained in the presence of NiAlO, CoAlO, and ZnAlO catalysts, a cyclohexyl ester of 6-hydroxyhexanoic acid was detected together with the main product. This is most likely a by-product obtained after the oxidation, ring opening, and subsequent esterification of the cyclohexanol. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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18 pages, 2862 KiB  
Article
Total Catalytic Oxidation of Ethanol over MnCoAl Mixed Oxides Derived from Layered Double Hydroxides: Effect of the Metal Ratio and the Synthesis Atmosphere Conditions
by Mariebelle Tannous, Charf Eddine Bounoukta, Stéphane Siffert, Christophe Poupin and Renaud Cousin
Catalysts 2023, 13(9), 1316; https://doi.org/10.3390/catal13091316 - 21 Sep 2023
Viewed by 1735
Abstract
In this work, the LDH approach was used to prepare MnCoAl mixed oxides with various textural and structural frameworks for the purpose of enhancing the total oxidation of ethanol. Our results showed that the catalytic activity of the MnCoAl oxides was influenced by [...] Read more.
In this work, the LDH approach was used to prepare MnCoAl mixed oxides with various textural and structural frameworks for the purpose of enhancing the total oxidation of ethanol. Our results showed that the catalytic activity of the MnCoAl oxides was influenced by the Mn/Co ratio and the gas atmosphere used during synthesis and thermal treatment. Rietveld refinement was processed to estimate the proportion of phases presented in the prepared materials. Our findings indicated that the generation of Mn2CoO4 spinel and Mn5O8 lamellar phases improved the redox properties and enhanced the active sites in the MnCoAl oxides. Notably, we observed that the catalytic activity at low temperatures of the catalyst increased with the decrease in the cobalt amount. It was also demonstrated that using an N2 atmosphere during the preparation of the materials is a promising route to prevent the formation of undesirable phases in the LDHs and their corresponding oxides. The presence of an O2-free atmosphere during the LDH synthesis positively affects the total ethanol transformation to CO2 over the oxide catalysts. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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13 pages, 5375 KiB  
Article
RuNi/MMO Catalysts Derived from a NiAl-NO3-LDH Precursor for CO Selective Methanation in H2-Rich Gases
by Zhihui Li, Xinyuan Zhao, Jiteng Ma and Xinfa Dong
Catalysts 2023, 13(9), 1245; https://doi.org/10.3390/catal13091245 - 27 Aug 2023
Cited by 1 | Viewed by 1160
Abstract
CO selective methanation (CO-SMET) is a promising method for deep CO removal from H2-rich gases. In this study, a series of RuNi/MMO catalysts are prepared using the support MMO-N derived from NiAl-NO3-LDHs, which was prepared from NiAl-CO3-LDHs [...] Read more.
CO selective methanation (CO-SMET) is a promising method for deep CO removal from H2-rich gases. In this study, a series of RuNi/MMO catalysts are prepared using the support MMO-N derived from NiAl-NO3-LDHs, which was prepared from NiAl-CO3-LDHs via an acid–alcohol ion-exchange reaction. The prepared catalysts were characterized by XRD, SEM, TEM, XPS, H2-TPR, CO-TPD, CO2-TPD, NH3-TPD, and TG. The RuNi/MMO-N catalyst demonstrated excellent CO-SMET performance, successfully reducing the CO to less than 10 ppm with a selectivity greater than 50% in a reaction temperature window ranging from 180 °C to 260 °C. Compared with similar catalysts derived from NiAl-CO3-LDHs, the exceptional CO-SMET capability of the RuNi/MMO-N catalyst is suggested to be associated with a more effective hydrogen spillover, a larger number of electron-rich Ni sites, and a higher density of acid sites on the surface of RuNi/MMO-N, which are conducive to CO adsorption and the inhibition of CO2 methanation. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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13 pages, 3559 KiB  
Article
Hierarchical Design of Homologous NiCoP/NF from Layered Double Hydroxides as a Long-Term Stable Electrocatalyst for Hydrogen Evolution
by Shenglu Song, Ailing Song, Lei Bai, Manman Duanmu, Lixin Wang, Haifeng Dong, Xiujuan Qin and Guangjie Shao
Catalysts 2023, 13(9), 1232; https://doi.org/10.3390/catal13091232 - 23 Aug 2023
Cited by 3 | Viewed by 1617
Abstract
Ternary transition metal phosphides (TTMPs) with two-dimensional heterointerface and adjustable electronic structures have been widely studied in hydrogen evolution reactions (HER). However, single-phase TMPs often have inappropriate H* adsorption energy and electronic transfer efficiency in HER. Herein, we utilized the heterogeneity in the [...] Read more.
Ternary transition metal phosphides (TTMPs) with two-dimensional heterointerface and adjustable electronic structures have been widely studied in hydrogen evolution reactions (HER). However, single-phase TMPs often have inappropriate H* adsorption energy and electronic transfer efficiency in HER. Herein, we utilized the heterogeneity in the crystal structure to design an efficient and stable catalyst from the NiCoP nanowire@NiCoP nanosheet on nickel foam (NW-NiCoP@NS-NiCoP/NF) for HER. Layered double hydroxides (LDHs) with a heterogeneous matrix on crystal surfaces were grown under different reaction conditions, and non-metallic P was introduced by anion exchange to adjust the electronic structure of the transition metals. The hierarchical structure of homologous NiCoP/NF from the LDH allows for a larger surface area, which results in more active sites and improved gas diffusion. The optimized NW-NiCoP@NS-NiCoP/NF electrode exhibits excellent HER activity, with an overpotential of 144 mV, a Tafel slope of 84.2 mV dec−1 at a current density of 100 mA cm−2 and remarkable stability for more than 500 h in 1.0 M KOH electrolyte. This work provides ideas for elucidating the rational design of structural heterogeneity as an efficient electrocatalyst and the in situ construction of hierarchical structures. Full article
(This article belongs to the Special Issue Layered Double Hydroxide-Based Catalysts for Advanced Chemical Technologies)
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