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Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition
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SYSNO ASEP 0569340 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Effect of Zinc on the Structure and Activity of the Cobalt Oxide Catalysts for NO Decomposition Author(s) Karásková, K. (CZ)
Pacultová, K. (CZ)
Bílková, T. (CZ)
Fridrichová, D. (CZ)
Koštejn, Martin (UCHP-M) RID, SAI, ORCID
Peikertová, P. (CZ)
Stelmachowski, P. (PL)
Kukula, P. (CZ)
Obalová, L. (CZ)Article number 18 Source Title Catalysts. - : MDPI
Roč. 13, č. 1 (2023)Number of pages 22 s. Language eng - English Country CH - Switzerland Keywords nitric oxide ; catalytic decomposition ; Co-spinel ; Zn bulk promotion OECD category Chemical process engineering Method of publishing Open access Institutional support UCHP-M - RVO:67985858 UT WOS 000916909700001 EID SCOPUS 85146781030 DOI 10.3390/catal13010018 Annotation Co4-iZniMnAlOx mixed oxides (i = 0, 0.5 and 1) were prepared by coprecipitation, subsequently modified with potassium (2 or 4 wt.% K), and investigated for direct catalytic NO decomposition, one of the most attractive and challenging NOx abatement processes. The catalysts were characterised by atomic absorption spectroscopy, powder X-ray diffraction, Raman and infrared spectroscopy, temperature-programmed reduction by hydrogen, the temperature-programmed desorption of CO2 and NO, X-ray photoelectron spectroscopy, scanning electron microscopy, the work function, and N-2 physisorption. The partial substitution of cobalt increased the specific surface area, decreased the pore sizes, influenced the surface composition, and obtained acid-base properties as a result of the higher availability of medium and strong basic sites. No visible changes in the morphology, crystallite size, and work function were observed upon the cobalt substitution. The conversion of NO increased after the Co substitution, however, the increase in the amount of zinc did not affect the catalytic activity, whereas a higher amount of potassium caused a decrease in the NO conversion. The results obtained, which were predominantly the acid-base characteristics of the catalyst, are in direct correlation with the proposed NO decomposition reaction mechanisms with NOx- as the main reaction intermediates. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2023 Electronic address https://www.mdpi.com/2073-4344/13/1/18
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