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Calcination Temperature on N2O Conversion in the Presence of H2O and NOx
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SYSNO ASEP 0540440 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Calcination Temperature on N2O Conversion in the Presence of H2O and NOx Author(s) Karásková, K. (CZ)
Pacultová, K. (CZ)
Jirátová, Květa (UCHP-M) RID, ORCID, SAI
Fridrichová, D. (CZ)
Koštejn, Martin (UCHP-M) RID, SAI, ORCID
Obalová, L. (CZ)Article number 1134 Source Title Catalysts. - : MDPI
Roč. 10, č. 10 (2020)Number of pages 17 s. Language eng - English Country CH - Switzerland Keywords nitrous oxide ; catalytic decomposition ; potassium ; calcination Subject RIV CI - Industrial Chemistry, Chemical Engineering OECD category Chemical process engineering Method of publishing Open access Institutional support UCHP-M - RVO:67985858 UT WOS 000583992900001 EID SCOPUS 85091899998 DOI 10.3390/catal10101134 Annotation The effect of calcination temperature (500-700 degrees C) on physico-chemical properties and catalytic activity of 2 wt. % K/Co-Mn-Al mixed oxide for N2O decomposition was investigated. Catalysts were characterized by inductively coupled plasma spectroscopy (ICP), X-ray powder diffraction (XRD), temperature-programmed reduction by hydrogen (TPR-H-2), temperature-programmed desorption of CO2 (TPD-CO2), temperature-programmed desorption of NO (TPD-NO), X-ray photoelectron spectrometry (XPS) and N-2 physisorption. It was found that the increase in calcination temperature caused gradual crystallization of Co-Mn-Al mixed oxide, which manifested itself in the decrease in Co2+/Co3+ and Mn3+/Mn4+ surface molar ratio, the increase in mean crystallite size leading to lowering of specific surface area and poorer reducibility. Higher surface K content normalized per unit surface led to the increase in surface basicity and adsorbed NO per unit surface. The effect of calcination temperature on catalytic activity was significant mainly in the presence of NOx, as the optimal calcination temperature of 500 degrees C is necessary to ensure sufficient low surface basicity, leading to the highest catalytic activity. Observed NO inhibition was caused by the formation of surface mononitrosyl species bonded to tetrahedral metal sites or nitrite species, which are stable at reaction temperatures up to 450 degrees C and block active sites for N2O decomposition. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2021 Electronic address file:///C:/Users/jirsova/AppData/Local/Temp/catalysts-10-01134-v3.pdf
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