Special Issue "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: 20 February 2022.

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

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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 (2 papers)

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Research

Article
Oscillatory Behaviour of Ni Supported on ZrO2 in the Catalytic Partial Oxidation of Methane as Determined by Activation Procedure
Materials 2021, 14(10), 2495; https://doi.org/10.3390/ma14102495 - 12 May 2021
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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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Article
Effects of the Incorporation of Distinct Cations in Titanate Nanotubes on the Catalytic Activity in NOx Conversion
Materials 2021, 14(9), 2181; https://doi.org/10.3390/ma14092181 - 24 Apr 2021
Viewed by 392
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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