Special Issue "Catalytic Decomposition of N2O and NO"

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

Deadline for manuscript submissions: 31 January 2020.

Special Issue Editor

Guest Editor
Prof. Dr. Lucie Obalová Website E-Mail
Institute of Environmental Technology, VŠB – Technical University of Ostrava, 17. listopadu 15, 708 33 Ostrava, Czech Republic
Interests: Chemical and reactor engineering, Environmental catalysis and photocatalysis, Adsorption on solids, Kinetics and mechanisms of chemical reaction, Abatement of N2O and NOx from waste gases

Special Issue Information

Dear Colleagues,

Nitrogen oxides NOx (NO, NO2) and N2O are significant pollutants and more than 90% of emitted NOx from stationary sources is NO. Various techniques have been developed for NO elimination, such as commercially commonly used selective catalytic reduction of NOx (SCR) and selective noncatalytic reduction of NOx (SNCR). In particular, less efficient SNCR technology will no longer be appropriate due to the tightening of emission limits. Compared to that, SCR NOx technology is very effective, but its disadvantage, like that of SNCR, is the need to add a reducing agent (ammonia, urea), which increases costs, causes undesirable ammonia slip, and requires increased safety precautions. From this perspective, the direct catalytic decomposition of NO without a reducing agent is a challenge. Mixed oxides with alkaline metal promoters appear to be active for this reaction, but there are a number of issues that need to be addressed. These are the stability of catalysts, sufficient activity at industrially suitable temperatures, and suppression of inhibition of the reaction by oxygen and other components present in the waste gases.

Well known greenhouse gas N2O is emitted from some processes together with NOx. Even in this case, a direct catalytic decomposition is the elegant method for reducing its emissions. This technology is now at the stage of its first commercial applications, for example, in nitric acid plants. However, there is still space for increasing its efficiency through the modification of the active site, deposition of the active phase on suitable support, etc.

Another issue is an indoor and outdoor environment, where nitrogen oxides can be decomposed in the presence of suitable semiconductor materials and light with appropriate wavelength and intensity. Research findings focusing on the fundamental exploration of the syntheses, characterizations, and applications of various types of catalysts for N2O or NO catalytic or photocatalytic decomposition, as well as new knowledge about the mechanism and industrial-scale development of catalysts are of prime importance to this Special Issue.

Prof. Dr. Lucie Obalová
Guest Editor

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 papers will be 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.

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Keywords

  • Direct NO catalytic decomposition
  • N2O catalytic decomposition
  • Photocatalytic decomposition of nitrogen oxides
  • Semiconductor photocatalysts, TiO2
  • Mixed oxide catalysts
  • Supported catalysts
  • Effect of promoters
  • Zeolites
  • Relation between methods of preparation, physicochemical and catalytic properties
  • Reaction mechanism and kinetics

Published Papers (1 paper)

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Research

Open AccessArticle
Photocatalytic Decomposition of N2O by Using Nanostructured Graphitic Carbon Nitride/Zinc Oxide Photocatalysts Immobilized on Foam
Catalysts 2019, 9(9), 735; https://doi.org/10.3390/catal9090735 - 30 Aug 2019
Abstract
The aim of this work was to deposit cost-effective g-C3N4/ZnO nanocomposite photocatalysts (weight ratios of g-C3N4:ZnO from 0.05:1 to 3:1) as well as pure ZnO and g-C3N4 on Al2O3 [...] Read more.
The aim of this work was to deposit cost-effective g-C3N4/ZnO nanocomposite photocatalysts (weight ratios of g-C3N4:ZnO from 0.05:1 to 3:1) as well as pure ZnO and g-C3N4 on Al2O3 foam and to study their photocatalytic efficiency for the photocatalytic decomposition of N2O, which was studied in a home-made batch photoreactor under ultraviolet A irradiation (λ = 365 nm). Based on the photocatalysis measurements, it was found that photocatalytic decomposition of N2O in the presence of all the prepared samples was significantly higher in comparison with photolysis. The photoactivity of the investigated nanocomposite photocatalysts increased in the following order: g-C3N4/ZnO (3:1) ≈ g-C3N4/ZnO (0.45:1) ≤ g-C3N4/ZnO (2:1) ZnO < g-C3N4 < g-C3N4/ZnO (0.05:1). The g-C3N4/ZnO (0.05:1) nanocomposite showed the best photocatalytic behavior and the most effective separation of photoinduced electron–hole pairs from all nanocomposites. The key roles played in photocatalytic activity were the electron–hole separation and the position and potential of the valence and conduction band. On the other hand, the specific surface area and band gap energy were not the significant factors in N2O photocatalytic decomposition. Immobilization of the photocatalyst on the foam permits facile manipulation after photocatalytic reaction and their repeated application. Full article
(This article belongs to the Special Issue Catalytic Decomposition of N2O and NO)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Magnesium effect in K/Co-Mg-Mn-Al mixed oxide catalyst for direct NO decomposition
Authors: K. Karásková, K. Pacultová, A. Klegová, D. Fridrichová, T. Kiška, K. Jirátová, L. Obalová
Abstract:Alkali metal promoted Co-Mn-Al mixed oxide catalysts were tested for direct NO decomposition. In this study, the effect of Mg partly substituting Co in the Co4MnAlOx mixed oxide catalyst subsequently modified by different potassium amount, maintaining (CoxMgy)/Mn/Al molar ratio constant, was studied. Prepared catalysts were characterized by XRD, BET, TPR-H2, TPD-CO2 and tested for direct NO decomposition in inert gas and in the presence of oxygen.

 

Title: Bulk and surface promotion of Co3O4 nanocrystals as a sensible tool for controlling the catalytic N2O decomposition
Authors: S. Wójcik, G. Grzybek, P. Stelmachowski, Z. Sojka, A. Kotarba
Abstract: Cobalt spinel nanocrystals, even in their bare state, have been recognized as a very active catalytic material for N2O decomposition. Their catalytic performance can be substantially modified by controlling the faceting of the nanocrystals and/or by proper doping with alien cations. These may located either in the bulk of the catalyst or on its surface. A particular attention is placed on the role of the tetra and octahedral interstitials, and the impact of the surface promoters as a potential hosting sites for the dopants. Both doping scenarios are analyzed in detail in the context of a rational design of the optimal active phase for an efficient low temperature N2O decomposition. The obtained experimental results are discussed in the broader context of the available literature data to establish the state-of-the-art of N2O decomposition over cobalt spinel catalysts.

 

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