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Article

Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process

1
Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Kraków, Poland
2
Instituto de Tecnología Química, Universitat Politècnica de València–Consejo Superior de Investigaciones Científicas, Avd. de los Naranjos s/n, 46022 Valencia, Spain
*
Author to whom correspondence should be addressed.
Materials 2020, 13(21), 4885; https://doi.org/10.3390/ma13214885
Received: 6 October 2020 / Revised: 22 October 2020 / Accepted: 28 October 2020 / Published: 30 October 2020
(This article belongs to the Special Issue Catalysis with Mesoporous Materials)
Ferrierites and their delaminated forms (ITQ-6), containing aluminum or titanium in the zeolite framework, were synthetized and modified with copper by an ion-exchange method. The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD, UV-Vis DRS), textural parameters (N2-sorption), surface acidity (NH3-TPD), form and reducibility of deposited copper species (UV-Vis DRS and H2-TPR). Ferrierites and delaminated ITQ-6 zeolites modified with copper were studied as catalysts for the selective catalytic oxidation of ammonia to dinitrogen (NH3-SCO). It was shown that aggregated copper oxide species, which were preferentially formed on Ti-zeolites, were catalytically active in direct low-temperature ammonia oxidation to NO, while copper introduced into Al-zeolites was present mainly in the form of monomeric copper cations catalytically active in selective reduction of NO by ammonia to dinitrogen. It was postulated that ammonia oxidation in the presence of the studied catalysts proceeds according to the internal-selective catalytic reduction mechanism (i-SCR) and therefore the suitable ratio between aggregated copper oxide species and monomeric copper cations is necessary to obtain active and selective catalysts for the NH3-SCO process. Cu/Al-ITQ-6 presented the best catalytic properties possibly due to the most optimal ratio of these copper species. View Full-Text
Keywords: NH3-SCO; ferrierite; ITQ-6; aluminum; titanium; copper NH3-SCO; ferrierite; ITQ-6; aluminum; titanium; copper
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MDPI and ACS Style

Święs, A.; Rutkowska, M.; Kowalczyk, A.; Díaz, U.; Palomares, A.E.; Chmielarz, L. Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process. Materials 2020, 13, 4885. https://doi.org/10.3390/ma13214885

AMA Style

Święs A, Rutkowska M, Kowalczyk A, Díaz U, Palomares AE, Chmielarz L. Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process. Materials. 2020; 13(21):4885. https://doi.org/10.3390/ma13214885

Chicago/Turabian Style

Święs, Aneta, Małgorzata Rutkowska, Andrzej Kowalczyk, Urbano Díaz, Antonio E. Palomares, and Lucjan Chmielarz. 2020. "Ferrierite and Its Delaminated Forms Modified with Copper as Effective Catalysts for NH3-SCO Process" Materials 13, no. 21: 4885. https://doi.org/10.3390/ma13214885

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