Reaction mechanism of direct NO decomposition over K-promoted Co-Mn-Al mixed oxides

Kód výsledku v IS VaVaI

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RIV/61989100:27730/19:10243222

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Reaction mechanism of direct NO decomposition over K-promoted Co-Mn-Al mixed oxides

Popis výsledku v původním jazyce

Contribution in the proceedings. In the present article, the aim was to evaluate a possible reaction mechanism through transient state experiments of NO catalytic decomposition in inert gas over K-promoted Co-Mn-Al mixed oxide. The adsorbed surface ionic nitrogen species (NO2-, NO3-, 1288-1482 cm-1) formed during NO decomposition over K- promoted Co4MnAlOx especially at lower temperatures indicating low thermal stability of NOx adspecies at &gt; 600oC. TPD-NO measurements showed that the amount of NO adsorbed on the catalyst surface differs according to the potassium amount and confirmed the presence of several NOx and/or oxygen species on the surface after reaction. The results from transient kinetic analysis suggested that the surface adsorbed species can act as intermediates in NO decomposition (Langmuir-Hinshelwood mechanism). However, formation of mixed labeled N2 (14N15N) proceeded in only very small amount and for that reason the possibility of Eley-Rideal mechanism should be also taken into account.

Název v anglickém jazyce

Reaction mechanism of direct NO decomposition over K-promoted Co-Mn-Al mixed oxides

Popis výsledku anglicky

Contribution in the proceedings. In the present article, the aim was to evaluate a possible reaction mechanism through transient state experiments of NO catalytic decomposition in inert gas over K-promoted Co-Mn-Al mixed oxide. The adsorbed surface ionic nitrogen species (NO2-, NO3-, 1288-1482 cm-1) formed during NO decomposition over K- promoted Co4MnAlOx especially at lower temperatures indicating low thermal stability of NOx adspecies at &gt; 600oC. TPD-NO measurements showed that the amount of NO adsorbed on the catalyst surface differs according to the potassium amount and confirmed the presence of several NOx and/or oxygen species on the surface after reaction. The results from transient kinetic analysis suggested that the surface adsorbed species can act as intermediates in NO decomposition (Langmuir-Hinshelwood mechanism). However, formation of mixed labeled N2 (14N15N) proceeded in only very small amount and for that reason the possibility of Eley-Rideal mechanism should be also taken into account.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20700 - Environmental engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů