Oxygen effect in NO direct decomposition over K/Co-Mg-Mn-Al mixed oxide catalyst-Temperature programmed desorption study

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27710%2F21%3A10248305" target="_blank" >RIV/61989100:27710/21:10248305 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985858:_____/21:00543504

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2468823121003126?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2468823121003126?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.mcat.2021.111695" target="_blank" >10.1016/j.mcat.2021.111695</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Oxygen effect in NO direct decomposition over K/Co-Mg-Mn-Al mixed oxide catalyst-Temperature programmed desorption study

Popis výsledku v původním jazyce

Co-Mg-Mn-Al mixed oxide with or without K was prepared and characterized by XPS, TPR H-2, TPD NO, TPD O-2 and TPD NO+O-2. NO decomposition was performed over catalyst activated in different atmosphere (N-2, He, O-2). Presence of oxygen during activation changed the course of surface stabilization but did not affect NO conversion achieved at steady state. O-2 desorbed as a reaction product does not affect the reaction rate for NO inlet con-centration of 400-8000 ppm, but presence of O-2 in inlet gas mixture (0.05 -3 mol.%) has significant inhibiting effect. Transition metals in octahedral coordination represent sites for NO chemisorption, while potassium en -sures NO oxidation to surface nitrites, which are indispensable reactive species. Oxygen desorption was the slowest reaction step, while N-2 desorption was fast. Oxygen inhibition was ascribed to oxidation of NO* species on the octahedral Co3+ and Mn3+ to more stable surface nitrates making NO* species as limiting reactant.

Název v anglickém jazyce

Oxygen effect in NO direct decomposition over K/Co-Mg-Mn-Al mixed oxide catalyst-Temperature programmed desorption study

Popis výsledku anglicky

Co-Mg-Mn-Al mixed oxide with or without K was prepared and characterized by XPS, TPR H-2, TPD NO, TPD O-2 and TPD NO+O-2. NO decomposition was performed over catalyst activated in different atmosphere (N-2, He, O-2). Presence of oxygen during activation changed the course of surface stabilization but did not affect NO conversion achieved at steady state. O-2 desorbed as a reaction product does not affect the reaction rate for NO inlet con-centration of 400-8000 ppm, but presence of O-2 in inlet gas mixture (0.05 -3 mol.%) has significant inhibiting effect. Transition metals in octahedral coordination represent sites for NO chemisorption, while potassium en -sures NO oxidation to surface nitrites, which are indispensable reactive species. Oxygen desorption was the slowest reaction step, while N-2 desorption was fast. Oxygen inhibition was ascribed to oxidation of NO* species on the octahedral Co3+ and Mn3+ to more stable surface nitrates making NO* species as limiting reactant.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20400 - Chemical 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)

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Molecular Catalysis

ISSN

2468-8231

e-ISSN

—

Svazek periodika

510

Číslo periodika v rámci svazku

June 2021

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

16

Strana od-do

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Kód UT WoS článku

000713699300002

EID výsledku v databázi Scopus

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