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Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties
Open AccessArticle

Co-Mn-Al Mixed Oxides Promoted by K for Direct NO Decomposition: Effect of Preparation Parameters

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Institute of Environmental Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, CZ-70800 Ostrava-Poruba, Czech Republic
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Faculty of Material Science and Technology, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, CZ-70800 Ostrava-Poruba, Czech Republic
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Centre ENET, VŠB-Technical University of Ostrava, 17. listopadu 15/2172, CZ-70800 Ostrava-Poruba, Czech Republic
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Institute of Chemical Process Fundamentals of the CAS, v.v.i., Rozvojová 2/135, CZ-16501 Praha 6-Suchdol, Czech Republic
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Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, PL-30387 Krakow, Poland
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Faculty of Chemistry, Department of Chemical Technology, Maria Curie—Skłodowska University, Plac Marii Curie—Skłodowskiej 3, PL-20-031 Lublin, Poland
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(7), 593; https://doi.org/10.3390/catal9070593
Received: 27 May 2019 / Revised: 2 July 2019 / Accepted: 3 July 2019 / Published: 9 July 2019
Fundamental research on direct NO decomposition is still needed for the design of a sufficiently active, stable and selective catalyst. Co-based mixed oxides promoted by alkali metals are promising catalysts for direct NO decomposition, but which parameters play the key role in NO decomposition over mixed oxide catalysts? How do applied preparation conditions affect the obtained catalyst’s properties? Co4MnAlOx mixed oxides promoted by potassium calcined at various conditions were tested for direct NO decomposition with the aim to determine their activity, stability and selectivity. The catalysts were prepared by co-precipitation of the corresponding nitrates and subsequently promoted by KNO3. The catalysts were characterized by atomic absorption spectrometry (AAS)/inductive coupled plasma (ICP), X-ray photoelectron spectrometry (XPS), XRD, N2 physisorption, temperature programmed desorption of CO2 (TPD-CO2), temperature programmed reduction by hydrogen (TPR-H2), species-resolved thermal alkali desorption (SR-TAD), work function measurement and STEM. The preparation procedure affects physico-chemical properties of the catalysts, especially those that are associated with the potassium promoter presence. The addition of K is essential for catalytic activity, as it substantially affects the catalyst reducibility and basicity—key properties of a deNO catalyst. However, SR-TAD revealed that potassium migration, redistribution and volatilization are strongly dependent on the catalyst calcination temperature—higher calcination temperature leads to potassium stabilization. It also caused the formation of new phases and thus affected the main properties—SBET, crystallinity and residual potassium amount. View Full-Text
Keywords: nitric oxide; catalytic decomposition; potassium promoter; cobalt-based mixed oxide nitric oxide; catalytic decomposition; potassium promoter; cobalt-based mixed oxide
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Pacultová, K.; Bílková, T.; Klegova, A.; Karásková, K.; Fridrichová, D.; Jirátová, K.; Kiška, T.; Balabánová, J.; Koštejn, M.; Kotarba, A.; Kaspera, W.; Stelmachowski, P.; Słowik, G.; Obalová, L. Co-Mn-Al Mixed Oxides Promoted by K for Direct NO Decomposition: Effect of Preparation Parameters. Catalysts 2019, 9, 593.

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