Special Issue "Catalysts for Energy and Environmental Applications"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Catalytic Materials".

Deadline for manuscript submissions: closed (30 April 2021).

Special Issue Editor

Assoc. Prof. Dr. Rodica Zavoianu
E-Mail Website
Guest Editor
Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, 4-12, Blvd. Regina Elisabeta, 030018 Bucharest, Romania
Interests: layered double hydroxides; mixed oxides; nickel molybdate; red mud; catalytic oxidation

Special Issue Information

Dear Colleagues,

In recent decades, humankind has been confronted with two important issues: (i) the increased need for cheap and sustainable energy sources and (ii) the intensification of environmental pollution. Therefore, all around the world, researchers are constantly trying to transform renewable raw materials into fuels with high caloric power and to eliminate pollutants from air, water, and soil by designing and applying selective catalytic processes. Oxides, mixed oxides, composites containing oxide components, and metals supported on oxide carriers are among the most utilized catalysts for these processes.

This Special Issue aims to update the findings related to oxide-containing materials employed as catalysts for the production of ecological fuels and in the environmental protection, respectively. Special attention is directed at the development of such catalysts by waste valorization, since this sustainable approach would enable both an economy of natural resources and a diminution of energy consumption in the synthesis of these materials. The design of modified layered double hydroxides and perovskite structures, including thin-film heterostructures, also leads to a wide range of new materials which can act as catalysts for the production of hydrogen and other ecological fuels, as well as for the degradation of organic pollutants from liquid and gaseous effluents. Moreover, progresses in the synthesis of supported metal catalysts with nanodispersed metal active species are thought to bring important contributions to the increase of the catalytic efficiency.

Taking into account the aforementioned aspects, I cordially invite you to contribute your recent work (review articles, original papers, and communications) to this Special Issue on oxide catalysts for energy and environmental applications, but not limited to, the following materials-oriented categories:

  • LDH-derived mixed oxides and/or LDHs-composites;
  • Perovskites and/or perovskite composites;
  • Oxide catalysts from waste materials;
  • Oxometallate based materials;
  • Supported metal catalysts.

Assoc. Prof. Dr. Rodica Zavoianu
Guest Editor

Manuscript Submission Information

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Keywords

  • Ecologic fuels
  • Decontamination
  • Metal oxides catalysts
  • Supported metal catalysts
  • Waste valorization

Published Papers (3 papers)

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Research

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Article
Effect of Particle Size and Crystal Surface of CeO2 on the Catalytic Combustion of Benzene
Materials 2020, 13(24), 5768; https://doi.org/10.3390/ma13245768 - 17 Dec 2020
Viewed by 486
Abstract
In this study, three kinds of CeO2 were synthesized, and supported PdOx (x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N2 adsorption/desorption, HRTEM, XPS and H2-TPR. The results show that [...] Read more.
In this study, three kinds of CeO2 were synthesized, and supported PdOx (x = 0,1) catalysts were prepared for benzene catalytic combustion. The samples were characterized by XRD, N2 adsorption/desorption, HRTEM, XPS and H2-TPR. The results show that three kinds of CeO2 with different structures can be formed by different preparation methods. This is mainly reflected in the differences in pore structure, particle size and crystal plane. CeO2-DC obtained from directly calcined Ce(NO3)3·6H2O had the largest pore volume and pore diameter and smallest particle size. CeO2-DC was mainly exposed to the (200) plane. Combined with the results of the ability test, it could be concluded that when Pd2+ and Pd0 exist at the same time, the activity increases with an increase in the proportion of Pd2+. Meanwhile, the structure of CeO2 affects the formation of oxygen vacancies, thereby affecting the adsorption and degradation of benzene. This article reveals that the particle size, crystal planes, oxygen vacancies and proportion of Pd2+ have a great impact on the catalytic combustion of benzene and allow a more comprehensive understanding of the structure–activity relationship, which can guide us to design high-efficiency catalysts targeted to obtain suitable CeO2-based catalysts for the catalytic combustion of benzene. Full article
(This article belongs to the Special Issue Catalysts for Energy and Environmental Applications)
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Article
Enhancement of Titania Photoanode Performance by Sandwiching Copper between Two Titania Layers
Materials 2020, 13(19), 4326; https://doi.org/10.3390/ma13194326 - 28 Sep 2020
Viewed by 629
Abstract
Vacancies in semiconductors can play a versatile role in boosting their photocatalytic activity. In this work, a novel TiO2/Cu/TiO2 sandwich structure is designed and constructed. Abundant vacancies were introduced in TiO2 lattice by Cu reduction under heat treatment. Meanwhile, [...] Read more.
Vacancies in semiconductors can play a versatile role in boosting their photocatalytic activity. In this work, a novel TiO2/Cu/TiO2 sandwich structure is designed and constructed. Abundant vacancies were introduced in TiO2 lattice by Cu reduction under heat treatment. Meanwhile, Cu atom could diffuse into TiO2 to form Cu-doped TiO2. The synergistic effect between oxygen vacancies and Cu atoms achieved about 2.4 times improved photocurrent of TiO2/Cu/TiO2 sandwich structure compared to bare TiO2 thin film. The enhanced photoactivity may be attributed to regulated electron structure of TiO2 by oxygen vacancies and Cu dopant from experimental results and density functional theory calculations. Oxygen vacancies and Cu dopant in TiO2 formed through copper metal reduction can introduce impurity levels and narrow the band gap of TiO2, thus improve the visible light response. More importantly, the Cu2+ and oxygen vacancies in TiO2 lattice can dramatically increase the charge density around conduction band and promote separation of photo-induced charge carriers. Furthermore, the oxygen vacancies on the surface may serve as active site for sufficient chemical reaction. This work presents a novel method to prepare doped metal oxides catalysts with abundant vacancies for improving photocatalytic activity. Full article
(This article belongs to the Special Issue Catalysts for Energy and Environmental Applications)
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Review

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Review
Complex Catalytic Materials Based on the Perovskite-Type Structure for Energy and Environmental Applications
Materials 2020, 13(23), 5555; https://doi.org/10.3390/ma13235555 - 05 Dec 2020
Viewed by 982
Abstract
This review paper focuses on perovskite-type materials as (photo)catalysts for energy and environmental applications. After a short introduction and the description of the structure of inorganic and hybrid organic-inorganic perovskites, the methods of preparation of inorganic perovskites both as powders via chemical routes [...] Read more.
This review paper focuses on perovskite-type materials as (photo)catalysts for energy and environmental applications. After a short introduction and the description of the structure of inorganic and hybrid organic-inorganic perovskites, the methods of preparation of inorganic perovskites both as powders via chemical routes and as thin films via laser-based techniques are tackled with, for the first, an analysis of the influence of the preparation method on the specific surface area of the material obtained. Then, the (photo)catalytic applications of the perovskites in energy production either in the form of hydrogen via water photodecomposition or by methane combustion, and in the removal of organic pollutants from waste waters, are reviewed. Full article
(This article belongs to the Special Issue Catalysts for Energy and Environmental Applications)
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