Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH3-SCR Process

Jankowska, Aleksandra; Chłopek, Agata; Kowalczyk, Andrzej; Rutkowska, Małgorzata; Michalik, Marek; Liu, Shiquan; Chmielarz, Lucjan

doi:10.3390/molecules25235651

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Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH₃-SCR Process

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

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

School of Materials Science and Engineering, University of Jinan, Jinan 250022, China

Authors to whom correspondence should be addressed.

Academic Editor: Jerzy Datka

Molecules 2020, 25(23), 5651; https://doi.org/10.3390/molecules25235651

Received: 3 November 2020 / Revised: 27 November 2020 / Accepted: 28 November 2020 / Published: 30 November 2020

(This article belongs to the Special Issue Zeolites and Mesoporous Materials: Properties and Applications)

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Abstract

Spherical MCM-41 with various copper and iron loadings was prepared by surfactant directed co-condensation method. The obtained samples were characterized with respect to their structure (X-ray diffraction, XRD), texture (N₂ sorption), morphology (scanning electron microscopy, SEM), chemical composition (inductively coupled plasma optical emission spectrometry, ICP-OES), surface acidity (temperature programmed desorption of ammonia, NH₃-TPD), form, and aggregation of iron and copper species (diffuse reflectance UV-Vis spectroscopy, UV-Vis DRS) as well as their reducibility (temperature programmed reduction with hydrogen, H₂-TPR). The spherical MCM-41 samples modified with transition metals were tested as catalysts of selective catalytic reduction of NO with ammonia (NH₃-SCR). Copper containing catalysts presented high catalytic activity at low-temperature NH₃-SCR with a very high selectivity to nitrogen, which is desired reaction products. Similar results were obtained for iron containing catalysts, however in this case the loadings and forms of iron incorporated into silica samples very strongly influenced catalytic performance of the studied samples. The efficiency of the NH₃-SCR process at higher temperatures was significantly limited by the side reaction of direct ammonia oxidation. The reactivity of ammonia molecules chemisorbed on the catalysts surface in NO reduction (NH₃-SCR) and their selective oxidation (NH₃-SCO) was verified by temperature-programmed surface reactions. View Full-Text

Keywords: spherical MCM-41; NH₃-SCR; NH₃-SCO; copper; iron

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Jankowska, A.; Chłopek, A.; Kowalczyk, A.; Rutkowska, M.; Michalik, M.; Liu, S.; Chmielarz, L. Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH₃-SCR Process. Molecules 2020, 25, 5651. https://doi.org/10.3390/molecules25235651

AMA Style

Jankowska A, Chłopek A, Kowalczyk A, Rutkowska M, Michalik M, Liu S, Chmielarz L. Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH₃-SCR Process. Molecules. 2020; 25(23):5651. https://doi.org/10.3390/molecules25235651

Chicago/Turabian Style

Jankowska, Aleksandra, Agata Chłopek, Andrzej Kowalczyk, Małgorzata Rutkowska, Marek Michalik, Shiquan Liu, and Lucjan Chmielarz. 2020. "Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH₃-SCR Process" Molecules 25, no. 23: 5651. https://doi.org/10.3390/molecules25235651

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Catalytic Performance of Spherical MCM-41 Modified with Copper and Iron as Catalysts of NH₃-SCR Process

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