Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH3-SCR

Jankowska, Aleksandra; Kowalczyk, Andrzej; Rutkowska, Małgorzata; Michalik, Marek; Chmielarz, Lucjan

doi:10.3390/molecules26061807

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Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH₃-SCR

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Faculty of Chemistry, Jagiellonian University in Kraków, Gronostajowa 2, 30-387 Krakow, Poland

Institute of Geological Sciences, Jagiellonian University in Kraków, Gronostajowa 3a, 30-387 Krakow, Poland

Author to whom correspondence should be addressed.

Academic Editor: Bhanu P. S. Chauhan

Molecules 2021, 26(6), 1807; https://doi.org/10.3390/molecules26061807

Received: 24 February 2021 / Revised: 19 March 2021 / Accepted: 20 March 2021 / Published: 23 March 2021

(This article belongs to the Special Issue 25th Anniversary of Molecules—Recent Advances in Applied Chemistry)

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Abstract

Aluminum containing silica spherical MCM-41 was synthesized and modified with copper by the template ion-exchange method (TIE) and its modified version, including treatment of the samples with ammonia solution directly after template ion-exchange (TIE-NH₃). The obtained samples were characterized with respect to their chemical composition (ICP-OES), structure (XRD), texture (low temperature N₂ sorption), morphology (SEM-EDS), form and aggregation of deposited copper species (UV-vis DRS), reducibility of copper species (H₂-TPR), and surface acidity (NH₃-TPD). The deposition of copper by the TIE-NH₃ method resulted in much better dispersion of this metal on the MCM-41 surface comparing to copper introduced by TIE method. It was shown that such highly dispersed copper species, mainly monomeric Cu²⁺ cations, deposited on aluminum containing silica spheres of MCM-41, are significantly more catalytically effective in the NH₃-SCR process than analogous catalysts containing aggregated copper oxide species. The catalysts obtained by the TIE-NH₃ method effectively operated in much broader temperature and were less active in the side process of direct ammonia oxidation by oxygen. View Full-Text

Keywords: silica-alumina spherical MCM-41; copper; template ion-exchange method; NH₃-SCR

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Jankowska, A.; Kowalczyk, A.; Rutkowska, M.; Michalik, M.; Chmielarz, L. Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH₃-SCR. Molecules 2021, 26, 1807. https://doi.org/10.3390/molecules26061807

AMA Style

Jankowska A, Kowalczyk A, Rutkowska M, Michalik M, Chmielarz L. Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH₃-SCR. Molecules. 2021; 26(6):1807. https://doi.org/10.3390/molecules26061807

Chicago/Turabian Style

Jankowska, Aleksandra, Andrzej Kowalczyk, Małgorzata Rutkowska, Marek Michalik, and Lucjan Chmielarz. 2021. "Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH₃-SCR" Molecules 26, no. 6: 1807. https://doi.org/10.3390/molecules26061807

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Spherical Al-MCM-41 Doped with Copper by Modified TIE Method as Effective Catalyst for Low-Temperature NH₃-SCR

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