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Developments of Catalysts for the Selective Catalytic Reduction of NO...
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Developments of Catalysts for the Selective Catalytic Reduction of NO with NH3

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

Deadline for manuscript submissions: closed (30 December 2021) | Viewed by 6360

Special Issue Editors

Dr. Bogdan Samojeden

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Guest Editor
Faculty of Energy and Fuels, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Cracow, Poland
Interests: catalysis in environmental protection; DeNOx, DeSOx, CO2 utilization
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Teresa Grzybek

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Guest Editor
Faculty of Energy and Fuels, AGH University of Science and Technology, Adama Mickiewicza Avenue 30, 30-059 Cracow, Poland
Interests: flue gas cleaning processes; adsorption; CO2 utilization

Special Issue Information

Dear Colleagues,

Selective catalytic reduction (SCR) is one of the most effective methods of removing NOx from waste gases. The emission limits according to current EU regulations are 150 mg/m3 for an existing large coal-fired boiler, 180 mg/m3 for a medium-sized boiler, and 270 mg/m3 for small boilers. For newly built units, the limits are 85, 100, and 150 mg/m3 according to size, respectively. These limits favor the utilization of SCR technology for medium and large existing units, as well as for all newly built ones.

One of the most commonly used catalyst types in the power industry is the vanadium-based system, which is composed of 1–2.5 wt.% of V2O5 as an active material, 8 wt.% of WO3 as a promoter, and anatase TiO2 as a supporter. According to the literature, V2O5-WO3/TiO2 catalysts work best in temperatures of 300–400 °C. Operation at higher temperatures can cause sintering, while operation at lower temperatures may result in catalyst plugging due to ammonia bisulfate formation. Thus, new active and selective catalysts operating at low temperatures (<300 oC) are of the great importance.

Original research papers and short reviews are welcome for submission to this Special Issue "Toward the Development of Catalysts for the Selective Catalytic Reduction of NO with NH3". Submissions should reflect the state of research in the SCR field in the following topics: selective catalytic reduction of NOx (SCR) for stationary power plants/industrial installations, SCR catalyst research and development (zeolites and other aluminosilicates, carbonaceous materials, catalysts based on waste/reprocessed materials, etc.), catalyst deactivation, catalyst regeneration, SCR reaction mechanisms, SCR kinetics and modeling, structure–function relationships in SCR catalysts, and dosage/decomposition of reducing agents for SCR. Papers reflecting industrial experience are also welcome.

Dr. Bogdan Samojeden
Prof. Dr. Teresa Grzybek
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. Catalysts is an international peer-reviewed open access monthly 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 2700 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

  • DeNOx
  • SCR
  • catalysts
  • mechanisms
  • deactivation
  • regeneration
  • poisoning

Published Papers (2 papers)

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Research

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20 pages, 3593 KiB  
Article
Modified Zeolite Catalyst for a NOx Selective Catalytic Reduction Process in Nitric Acid Plants
by Magdalena Saramok, Agnieszka Szymaszek, Marek Inger, Katarzyna Antoniak-Jurak, Bogdan Samojeden and Monika Motak
Catalysts 2021, 11(4), 450; https://doi.org/10.3390/catal11040450 - 31 Mar 2021
Cited by 18 | Viewed by 2744
Abstract
Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) in the temperature range of 150–450 °C. The catalyst was prepared at a laboratory scale [...] Read more.
Natural zeolite of the heulandite-type framework was modified with iron and tested as a catalyst for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR) in the temperature range of 150–450 °C. The catalyst was prepared at a laboratory scale in a powder form and then the series of experiments of its shaping into tablets was conducted. Physicochemical studies of the catalyst (N2 sorption at −196 °C, FT-IR, XRD, UV-vis) were performed to determine the textural and structural properties and identify the surface functional groups, the crystalline structure of the catalysts and the form and aggregation of the active phase. The activity tests over the shaped catalyst were performed industry-reflecting conditions, using tail gases from the pilot nitric acid plant. The influence of a temperature, catalyst load, and the amount of reducing agent (ammonia) on the NOx reduction process were investigated. The results of catalytic tests that were performed on model gas mixture showed that non-modified clinoptilolite exhibited around 58% conversion of NO at 450 °C. The temperature window of the shaped catalyst shifted to a higher temperature range in comparison to the powder sample. The catalytic performance of the shaped Fe-clinoptilolite in the industry-reflecting conditions was satisfactory, especially at 450 °C. Additionally, it was observed that the ratio of N2O concentration downstream and upstream of the catalytic bed was below 1, which indicated that the catalyst exhibited activity in both DeNOx and DeN2O process. Full article
(This article belongs to the Special Issue Developments of Catalysts for the Selective Catalytic Reduction of NO with NH3)
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Review

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18 pages, 5232 KiB  
Review
Recent Advances in MnOx/CeO2-Based Ternary Composites for Selective Catalytic Reduction of NOx by NH3: A Review
by Hao Sun and Soo-Jin Park
Catalysts 2021, 11(12), 1519; https://doi.org/10.3390/catal11121519 - 14 Dec 2021
Cited by 9 | Viewed by 2492
Abstract
Recently, manganese oxides (MnOx)/cerium(IV) oxide (CeO2) composites have attracted widespread attention for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia (NH3), which exhibit outstanding catalytic performance owing to unique features, such as [...] Read more.
Recently, manganese oxides (MnOx)/cerium(IV) oxide (CeO2) composites have attracted widespread attention for the selective catalytic reduction (SCR) of nitrogen oxides (NOx) with ammonia (NH3), which exhibit outstanding catalytic performance owing to unique features, such as a large oxygen storage capacity, excellent low-temperature activity, and strong mechanical strength. The intimate contact between the components can effectively accelerate the charge transfer to enhance the electron–hole separation efficiency. Nevertheless, MnOx/CeO2 still reveals some deficiencies in the practical application process because of poor thermal stability, and a low reduction efficiency. Constructing MnOx/CeO2 with other semiconductors is the most effective strategy to further improve catalytic performance. In this article, we discuss progress in the field of MnOx/CeO2-based ternary composites with an emphasis on the SCR of NOx by NH3. Recent progress in their fabrication and application, including suitable examples from the relevant literature, are analyzed and summarized. In addition, the interaction mechanisms between MnOx/CeO2 catalysts and NOx pollutants are comprehensively dissected. Finally, the review provides basic insights into prospects and challenges for the advancement of MnOx/CeO2-based ternary catalysts. Full article
(This article belongs to the Special Issue Developments of Catalysts for the Selective Catalytic Reduction of NO with NH3)
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