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Open AccessArticle

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

1
Institute of Chemical Process Fundamentals of the CAS, v.v.i., Rozvojová 135, CZ- 165 02 Praha 6- Suchdol, Czech Republic
2
Institute of Environmental Technology, VŠB- TU Ostrava, 17. listopadu 15/2172, CZ- 708 00 Ostrava- Poruba, Czech Republic
3
Faculty of Chemistry, Jagiellonian University, Gronostajowa 2, PL- 30387 Krakow, Poland
*
Author to whom correspondence should be addressed.
Catalysts 2019, 9(7), 592; https://doi.org/10.3390/catal9070592
Received: 28 May 2019 / Revised: 26 June 2019 / Accepted: 5 July 2019 / Published: 9 July 2019
Direct decomposition of nitric oxide (NO) proceeds over Co–Mn–Al mixed oxides promoted by potassium. In this study, answers to the following questions have been searched: Do the properties of the K-promoted Co–Mn–Al catalysts prepared by different methods differ from each other? The K-precipitated Co–Mn–Al oxide catalysts were prepared by the precipitation of metal nitrates with a solution of K2CO3/KOH, followed by the washing of the precipitate to different degrees of residual K amounts, and by cthe alcination of the precursors at 500 °C. The properties of the prepared catalysts were compared with those of the best catalyst prepared by the K-impregnation of a wet cake of Co–Mn–Al oxide precursors. The solids were characterized by chemical analysis, DTG, XRD, N2 physisorption, FTIR, temperature programmed reduction (H2-TPR), temperature programmed CO2 desorption (CO2-TPD), X-ray photoelectron spectrometry (XPS), and the species-resolved thermal alkali desorption method (SR-TAD). The washing of the K-precipitated cake resulted in decreasing the K amount in the solid, which affected the basicity, reducibility, and non-linearly catalytic activity in NO decomposition. The highest activity was found at ca 8 wt.% of K, while that of the best K-impregnated wet cake catalyst was at about 2 wt.% of K. The optimization of the cake washing conditions led to a higher catalytic activity. View Full-Text
Keywords: NO decomposition; Co–Mn–Al mixed oxides; catalyst preparation; potassium promoter NO decomposition; Co–Mn–Al mixed oxides; catalyst preparation; potassium promoter
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Jirátová, K.; Pacultová, K.; Balabánová, J.; Karásková, K.; Klegová, A.; Bílková, T.; Jandová, V.; Koštejn, M.; Martaus, A.; Kotarba, A.; Obalová, L. Precipitated K-Promoted Co–Mn–Al Mixed Oxides for Direct NO Decomposition: Preparation and Properties. Catalysts 2019, 9, 592.

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