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Hydrotalcite-Modified Clinoptilolite as the Catalyst for Selective Catalytic Reduction of NO with Ammonia (NH3-SCR)

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Szymaszek-Wawryca, Agnieszka, Summa, Paulina, Duraczyńska, Dorota, Díaz, Urbano, Motak, Monika·2022·Materials
DOI 10.3390/ma15227884PMC PMC9696415
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Abstract

A series of clinoptilolite-supported catalysts, modified with hydrotalcite-like phase (HT) by co-precipitation, were prepared and tested in NH3-SCR reactions. It was found that deposition of HT on clinoptilolite increased conversion of NO within 250–450 °C, and that the positive impact on the catalytic activity was independent of HT loading. The promoting effect of clinoptilolite was attributed to Brönsted acid sites present in the zeolite, which facilitated adsorption and accumulation of ammonia during the catalytic process. Concentration of N2O in the post-reaction gas mixture reached its maximum at 300 °C and the by-product was most likely formed as a consequence of NH4NO3 decomposition or side reaction of NH3 oxidation in the high-temperature region. The gradual elimination of nitrous oxide, noticed as the material with the highest concentration of hydrotalcite phase, was attributed to the abundance of oligomeric iron species and the superior textural parameters of the material. UV-Vis experiments performed on the calcined samples indicated that Fe sites of higher nuclearity were generated by thermal decomposition of the hydrotalcite phase during the catalytic reaction. Therefore, calcination of the materials prior to the catalytic tests was not required to obtain satisfactory overall catalytic performance in NO reductions.

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  • FESEM analysis shows the typical flake structure of clinoptilolite, with particles aggregated and grains having no well-defined crystal faces.

    “By performing a FESEM analysis, it is possible to see the typical “flake” structure of the clinoptilolite, as reported in Fig. 2. The particles appeared aggregated and characterized by grains with no well-defined crystal faces”

    From Fundamental properties and sustainable applications of the natural zeolite clinoptilolite (2024) · cites this paper as Szymaszek-Wawryca et al. 2022

    Methods §2.2 identifies a field-emission scanning electron microscope, and Results §3.2.3 (Figure 5) describes clinoptilolite as randomly arranged, plate-like layers with splitting typical of the mineral. The paper does not describe grains lacking well-defined crystal faces; it instead says the structure did not consist of individual grains and exhibited high crystallinity. (LLM, conf=0.87)

    Experimental — accuracy not yet measured

  • The 26 m2/g surface area result is in agreement with other clinoptilolites from different geographical areas: 35 m2/g, 13 m2/g, and 22 m2/g.

    “This result is in agreement with those obtained with other clinoptilolites found in different geographical areas (i.e., 35 m2/g (Shen et al. 2020), 13 m2/g (Szymaszek-Wawryca et al. 2022), 22 m2/g (Cavallo et al. 2023), and so on).”

    From Fundamental properties and sustainable applications of the natural zeolite clinoptilolite (2024) · cites this paper as Szymaszek-Wawryca et al. 2022

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Cited by

Sorted by citations

Authors
Szymaszek-Wawryca, A., Summa, P., Duraczyńska, D., Díaz, U., & Motak, M.
Affiliations
  • AGH University of Krakow (PL)
  • Jerzy Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences (PL)
  • Consejo Superior de Investigaciones Científicas (ES)
Corresponding author
Szymaszek-Wawryca, Agnieszka
ORCID
Venue
Materials
Publisher
MDPI AG
Published
2022-11-08
Volume
15
Issue
22
Pages
7884
ISSN
1996-1944 (ISSN-L)
DOI
10.3390/ma15227884
PMC
PMC9696415
OpenAlex
W4308720839
Cited by
11
References
0
Citations by year
2026: 4 · 2025: 4 · 2024: 2 · 2023: 1
FWCI
0.49
Type
journal article
Language
en
Open access
Licence
Locations
  • Materials (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • RiuNet (Universitat Politècnica de València) (submittedVersion, cc-by-nc-nd)
Funders
  • National Science Centre (2020/37/N/ST5/00186, PID2020-112590GB C21/AEI/10.13039/501100011033)
  • Government of Spain (2020/37/N/ST5/00186, PID2020-112590GB C21/AEI/10.13039/501100011033)
Topics
  • Physical Sciences › Materials Science › Materials Chemistry › Catalytic Processes in Materials Science
  • Physical Sciences › Chemistry › Inorganic Chemistry › Zeolite Catalysis and Synthesis
  • Physical Sciences › Engineering › Mechanical Engineering › Industrial Gas Emission Control
Keywords
hydrotalcite-like phases, clinoptilolite, NH3-SCR, selective catalytic reduction of NO, zeolite-supported catalysts, Brønsted acid sites, ammonia adsorption, nitrous oxide production, calcination, co-precipitation

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