Special Issue "Advanced Nanocatalyst for Methane Oxidation"

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

Deadline for manuscript submissions: 31 July 2021.

Special Issue Editor

Dr. Zouhair Boukha
Website
Guest Editor
Universidad del Pais Vasco - Euskal Herriko Unibertsitatea, Campus Bizkaia, Leioa, Spain

Special Issue Information

Dear Colleagues,

The proven reserves of natural gas (consisting mainly of methane) are still abundant, which makes it essential to develop the technologies related to its use as an energy source and/or a raw material for high-added-value products. Concerning methane conversion strategies, the oxidation processes, which include combustion, reforming and oxidative coupling, are the most commonly used. Current research is generally focused on the improvement of methane oxidation catalytic processes by using a large number of formulations of noble and transition metal-based catalysts. In this sense, increasing the selectivity of desirable products and lowering the energy input are considered major concerns. Moreover, the resistance of the used catalysts to deactivation under severe conditions is one of the challenges that has attracted the wide interest of researchers. For a long time, it was reported that the methane oxidation is a structure-sensitive reaction where the dispersion of the metallic active phase plays a key role in its activity and durability. In line with this, it has been demonstrated that the design of nanocatalysts with a controlled size provides many advantages compared to the traditional routes of preparation.

In the present Special Issue, you are invited to publish your original research on the applicability of advanced materials in different methane oxidation processes.

Dr. Zouhair Boukha
Guest Editor

Manuscript Submission Information

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Keywords

  • Methane oxidation
  • Combustion
  • Reforming
  • Oxidative coupling
  • Nanocatalyst
  • New design
  • Noble metal
  • Transition metal
  • Catalytic performance

Published Papers (2 papers)

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Research

Open AccessFeature PaperArticle
Performance of a Direct Methane Solid Oxide Fuel Cell Using Nickel-Ceria-Yttria Stabilized Zirconia as the Anode
Materials 2020, 13(3), 599; https://doi.org/10.3390/ma13030599 - 28 Jan 2020
Cited by 5
Abstract
A nickel-ceria-yttria stabilized zirconia (Ni-CYSZ) cermet material was synthesized and tested as the anode for the direct oxidation of methane in a solid oxide fuel cell (SOFC) with YSZ as the electrolyte and strontium-doped lanthanum manganite (LSM) as the cathode. Initially, the electrochemical [...] Read more.
A nickel-ceria-yttria stabilized zirconia (Ni-CYSZ) cermet material was synthesized and tested as the anode for the direct oxidation of methane in a solid oxide fuel cell (SOFC) with YSZ as the electrolyte and strontium-doped lanthanum manganite (LSM) as the cathode. Initially, the electrochemical behavior was investigated under several load demands in wet (3% H2O) CH4 at 850 °C during 144 h using I-V curves, impedance spectra, and potentiostatic measurements. Long-term tests were subsequently conducted under 180 mA·cm–2 in wet CH4 for 236 h and dry CH4 for 526 h at 850 °C in order to assess the cell stability. Material analysis was carried out by SEM-EDS after operation was complete. Similar cell performance was observed with wet (3% H2O) and dry CH4, and this indicates that the presence of water is not relevant under the applied load demand. Impedance spectra of the cell showed that at least three processes govern the direct electrochemical oxidation of methane on the Ni-CYSZ anode and these are related to charge transfer at high frequency, the adsorption/desorption of charged species at medium frequency and the non-charge transfer processes at low frequency. The cell was operated for more than 900 h in CH4 and 806 h under load demand, with a low degradation rate of ~0.2 mV·h–1 observed during this period. The low degradation in performance was mainly caused by the increase in charge transfer resistance, which can be attributed to carbon deposition on the anode causing a reduction in the number of active centers. Carbon deposits were detected mostly on the surface of Ni particles but not near the anode/electrolyte interface or the cerium surface. Therefore, the incorporation of cerium in the anode structure could improve the cell lifetime by reducing carbon formation. Full article
(This article belongs to the Special Issue Advanced Nanocatalyst for Methane Oxidation)
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Open AccessArticle
Synthesis, Characterization and Kinetic Behavior of Supported Cobalt Catalysts for Oxidative after-Treatment of Methane Lean Mixtures
Materials 2019, 12(19), 3174; https://doi.org/10.3390/ma12193174 - 27 Sep 2019
Cited by 1
Abstract
The present work addresses the influence of the support on the catalytic behavior of Co3O4-based catalysts in the combustion of lean methane present in the exhaust gases from natural gas vehicular engines. Three different supports were selected, namely γ-alumina, [...] Read more.
The present work addresses the influence of the support on the catalytic behavior of Co3O4-based catalysts in the combustion of lean methane present in the exhaust gases from natural gas vehicular engines. Three different supports were selected, namely γ-alumina, magnesia and ceria and the corresponding catalysts were loaded with a nominal cobalt content of 30 wt. %. The samples were characterized by N2 physisorption, wavelength dispersive X-ray fluorescence (WDXRF), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and temperature-programmed reduction with hydrogen and methane. The performance was negatively influenced by a strong cobalt-support interaction, which in turn reduced the amount of active cobalt species as Co3O4. Hence, when alumina or magnesia supports were employed, the formation of CoAl2O4 or Co–Mg mixed oxides, respectively, with a low reducibility was evident, while ceria showed a lower affinity for deposited cobalt and this remained essentially as Co3O4. Furthermore, the observed partial insertion of Ce into the Co3O4 lattice played a beneficial role in promoting the oxygen mobility at low temperatures and consequently the catalytic activity. This catalyst also exhibited a good thermal stability while the presence of water vapor in the feedstream induced a partial inhibition, which was found to be completely reversible. Full article
(This article belongs to the Special Issue Advanced Nanocatalyst for Methane Oxidation)
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