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Oxide-Based Materials for Sustainable Catalytic Processes
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Oxide-Based Materials for Sustainable Catalytic Processes

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

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 11012

Special Issue Editors

Prof. Delia Gazzoli

E-Mail Website
Guest Editor
Department of Chemistry, Università degli Studi di Roma La Sapienza, Rome, Italy
Interests: materials science; surface chemistry; bulk and surface properties of oxide systems; catalysts characterization; surface structure and catalytic properties
Prof. Elisabetta Rombi

E-Mail Website
Guest Editor
Department of Chemical and Geological Sciences, Università di Cagliari, Cagliari, Italy
Interests: heterogeneous catalysis; synthesis and characterization of mesoporous and microporous catalysts; catalytic tests

Special Issue Information

Dear Colleagues,

Oxides are versatile materials that have a wide range of properties and technological applications deriving from their chemical stability and peculiar chemical and physical properties involving bulk and surface structure. As nanomaterials, they represent a growing resource in many fields due to their tunable physicochemical properties, resulting in enhanced performances compared to their bulk counterparts.

In heterogeneous catalysis, metal oxides, either as active phases or as supports, represent one of the most important classes of solid catalysts for the production of chemicals and chemical intermediates; energy conversion; and environmental remediation. Among the different families of catalysts, supported systems play a key role since catalyst performance depends on a variety of parameters, including particle size and shape, surface structure, interaction between surface species, and support materials.

The design of robust oxide-based catalysts with high performances and tailored functionalities for existing and new applications requires the development of strategies to obtain materials with intentionally designed structures and composition, as well as an accurate characterization of bulk and surfaces properties. To this end, besides the traditional characterization techniques, a number of methods applied under operating conditions allow for a better understanding of the nature, structure, composition, and reactivity of both the support and supported species.

This Special Issue is aimed at covering recent research and new trends in the development and application of oxide-based materials and nanomaterials in different fields of heterogeneous catalysis, including energy production, biomass valorization, and environmental remediation.

The Editors welcome contributions in the form of research papers, communications and reviews focusing on design and development of new oxide-based materials for sustainable catalytic processes, characterization of oxide surfaces including operando methods, relations between structure and catalytic properties.

Prof. Delia Gazzoli
Prof. Elisabetta Rombi
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. Materials is an international peer-reviewed open access semimonthly 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 2600 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

  • Supported oxide systems
  • Design and development of new catalytic materials
  • Nanomaterials
  • Characterization of oxide surfaces
  • Surface science
  • Operando spectroscopy
  • Catalysis and energy materials
  • Carbon dioxide valorization
  • Biomass conversion
  • Catalysis for renewable sources.

Published Papers (5 papers)

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Research

13 pages, 3425 KiB  
Article
Catalysts Based on Strontium Titanate Doped with Ni/Co/Cu for Dry Reforming of Methane
by Adrian Mizera, Andrzej Kowalczyk, Lucjan Chmielarz and Ewa Drożdż
Materials 2021, 14(23), 7227; https://doi.org/10.3390/ma14237227 - 26 Nov 2021
Cited by 8 | Viewed by 1979
Abstract
Two series of strontium titanates doped with Ni, Co, or Cu with general formula of SrTi1-xMexO3 for Sr-stoichiometric and Sr0.95Ti1−xMexO3 for Sr-non-stoichiometric materials (where Me = Ni, Co or Cu and [...] Read more.
Two series of strontium titanates doped with Ni, Co, or Cu with general formula of SrTi1-xMexO3 for Sr-stoichiometric and Sr0.95Ti1−xMexO3 for Sr-non-stoichiometric materials (where Me = Ni, Co or Cu and x were 0.02 and 0.06) were obtained by the wet chemical method. The samples were calcinated at 900, 950, and 1050 °C and characterized in terms of their structural properties (XRD), the possibility of undergoing the reduction and oxidation reactions (TPR/TPOx), and catalytic properties. All obtained materials were multiphase and although the XRD analysis does not confirm the presence of Ni, Co, and Cu oxides (with one exception for Cu-doped sample), the TPR/TPOx profiles show reduction peaks that can be attributed to the reduction of these oxides which may at first appear in an amorphous form. Catalytic tests in dry reforming of methane reaction showed that the highest catalytic activity was achieved for Ni-doped materials (up to 90% of CH4 conversion) while Co and Cu-doped samples showed only a very slight catalytic effect. Additionally, the decrease in methane conversion with an increasing calcination temperature was observed for Ni-doped strontium titanates. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Sustainable Catalytic Processes)
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18 pages, 4392 KiB  
Article
Promoting Effect of Palladium on ZnAl2O4-Supported Catalysts Based on Cobalt or Copper Oxide on the Activity for the Total Propene Oxidation
by Marco Antonio Ocsachoque, María Silvia Leguizamón-Aparicio, Mónica Laura Casella and Ileana Daniela Lick
Materials 2021, 14(17), 4814; https://doi.org/10.3390/ma14174814 - 25 Aug 2021
Cited by 2 | Viewed by 1615
Abstract
Palladium-modified Co-ZnAland Cu-ZnAl materials were used and found active for the catalytic oxidation of propene and propane. According to the results obtained by XRD, TPR and XPS, the zinc aluminate-supported phases are oxide phases, Co3O4, CuO and PdOx [...] Read more.
Palladium-modified Co-ZnAland Cu-ZnAl materials were used and found active for the catalytic oxidation of propene and propane. According to the results obtained by XRD, TPR and XPS, the zinc aluminate-supported phases are oxide phases, Co3O4, CuO and PdOx for Co-ZnAl, Cu-ZnAl and Pd-ZnAl catalysts, respectively. These reducible oxide species present good catalytic activity for the oxidation reactions. The addition of palladium to Co-ZnAl or Cu-ZnAl samples promoted the reducibility of the system and, consequently, produced a synergic effect which enhanced the activity for the propene oxidation. The PdCo-ZnAl sample was the most active and exhibited highly dispersed PdOx particles and surface structural defects. In addition, it exhibited good catalytic stability. The H2 pre-treated PdCu-ZnAl, PdCo-ZnAl and Pd-ZnAl samples showed higher activity than the original oxide catalysts, evidencing the important role of the oxidation state of the species, mainly of the palladium species, on the catalytic activity for the propene combustion. The synergic effect between metal transition oxides and PdOx could not be observed for the propane oxidation. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Sustainable Catalytic Processes)
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18 pages, 2322 KiB  
Article
Synthesis of Dimethyl Carbonate by Transesterification of Propylene Carbonate with Methanol on CeO2-La2O3 Oxides Prepared by the Soft Template Method
by Maria Giorgia Cutrufello, Luciano Atzori, Daniela Meloni, Alessandra Piras, Delia Gazzoli and Elisabetta Rombi
Materials 2021, 14(17), 4802; https://doi.org/10.3390/ma14174802 - 24 Aug 2021
Cited by 3 | Viewed by 2311
Abstract
In this study, CeO2, La2O3, and CeO2-La2O3 mixed oxide catalysts with different Ce/La molar ratios were prepared by the soft template method and characterized by different techniques, including inductively coupled plasma atomic [...] Read more.
In this study, CeO2, La2O3, and CeO2-La2O3 mixed oxide catalysts with different Ce/La molar ratios were prepared by the soft template method and characterized by different techniques, including inductively coupled plasma atomic emission spectrometry, X-ray diffraction, N2 physisorption, thermogravimetric analysis, and Raman and Fourier transform infrared spectroscopies. NH3 and CO2 adsorption microcalorimetry was also used for assessing the acid and base surface properties, respectively. The behavior of the oxides as catalysts for the dimethyl carbonate synthesis by the transesterification of propylene carbonate with methanol, at 160 °C under autogenic pressure, was studied in a stainless-steel batch reactor. The activity of the catalysts was found to increase with an increase in the basic sites density. The formation of dimethyl carbonate was favored on medium-strength and weak basic sites, while it underwent decomposition on the strong ones. Several parasitic reactions occurred during the transformation of propylene carbonate, depending on the basic and acidic features of the catalysts. A reaction pathway has been proposed on the basis of the components identified in the reaction mixture. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Sustainable Catalytic Processes)
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27 pages, 7452 KiB  
Article
Oscillatory Behaviour of Ni Supported on ZrO2 in the Catalytic Partial Oxidation of Methane as Determined by Activation Procedure
by Daniela Pietrogiacomi, Maria Cristina Campa, Ida Pettiti, Simonetta Tuti, Giulia Luccisano, Leandro Ardemani, Igor Luisetto and Delia Gazzoli
Materials 2021, 14(10), 2495; https://doi.org/10.3390/ma14102495 - 12 May 2021
Cited by 2 | Viewed by 1841
Abstract
Ni/ZrO2 catalysts, active and selective for the catalytic partial oxidation of methane to syngas (CH4-CPO), were prepared by the dry impregnation of zirconium oxyhydroxide (Zhy) or monoclinic ZrO2 (Zm), calcination at 1173 K and activation [...] Read more.
Ni/ZrO2 catalysts, active and selective for the catalytic partial oxidation of methane to syngas (CH4-CPO), were prepared by the dry impregnation of zirconium oxyhydroxide (Zhy) or monoclinic ZrO2 (Zm), calcination at 1173 K and activation by different procedures: oxidation-reduction (ox-red) or direct reduction (red). The characterization included XRD, FESEM, in situ FTIR and Raman spectroscopies, TPR, and specific surface area measurements. Catalytic activity experiments were carried out in a flow apparatus with a mixture of CH4:O2 = 2:1 in a short contact time. Compared to Zm, Zhy favoured the formation of smaller NiO particles, implying a higher number of Ni sites strongly interacting with the support. In all the activated Ni/ZrO2 catalysts, the Ni–ZrO2 interaction was strong enough to limit Ni aggregation during the catalytic runs. The catalytic activity depended on the activation procedures; the ox-red treatment yielded very active and stable catalysts, whereas the red treatment yielded catalysts with oscillating activity, ascribed to the formation of Niδ+ carbide-like species. The results suggested that Ni dispersion was not the main factor affecting the activity, and that active sites for CH4-CPO could be Ni species at the boundary of the metal particles in a specific configuration and nuclearity. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Sustainable Catalytic Processes)
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29 pages, 10366 KiB  
Article
Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion
by José Vitor C. do Carmo, Cleanio L. Lima, Gabriela Mota, Ariane M. S. Santos, Ludyane N. Costa, Anupama Ghosh, Bartolomeu C. Viana, Monique Silva, João M. Soares, Samuel Tehuacanero-Cuapa, Rossano Lang, Alcineia C. Oliveira, Enrique Rodríguez-Castellón and Elena Rodríguez-Aguado
Materials 2021, 14(9), 2181; https://doi.org/10.3390/ma14092181 - 24 Apr 2021
Cited by 6 | Viewed by 2334 | Correction
Abstract
Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NOx conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with [...] Read more.
Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NOx conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with the NTs produced catalysts with metals included in the interlayer regions of the trititanate NTs whereas an assembly of Ag and Pt nanoparticles were either on the nanotubes surface or inner diameters through an impregnation process. Understanding the role of the different metal cations intercalated or supported on the nanotubes, the optimal selective catalytic reduction of NOx by CO reaction (SCR) conditions was investigated by carrying out variations in the reaction temperature, SO2 and H2O poisoning and long-term stability runs. Pt nanoparticles on the NTs exhibited superior activity compared to the Cr, Co and Al intercalated in the nanotubes and even to the Ag and Ni counterparts. Resistance against SO2 poisoning was low on NiNT due to the trititanate phase transformation into TiO2 and also to sulfur deposits on Ni sites. However, the interaction between Pt2+ from PtOx and Ti4+ in the NTs favored the adsorption of both NOx and CO enhancing the catalytic performance. Full article
(This article belongs to the Special Issue Oxide-Based Materials for Sustainable Catalytic Processes)
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