NO Conversion with NH3 by Catalysts Derived from Ti-MWW Layered Zeolites with Tailored Porosity
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F25%3A10507303" target="_blank" >RIV/00216208:11310/25:10507303 - isvavai.cz</a>
Výsledek na webu
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=JSxoOLX1fZ" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=JSxoOLX1fZ</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.jpcc.5c06118" target="_blank" >10.1021/acs.jpcc.5c06118</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
NO Conversion with NH3 by Catalysts Derived from Ti-MWW Layered Zeolites with Tailored Porosity
Popis výsledku v původním jazyce
Acid-treated Ti-MCM-22 zeolite and its micromesoporous derivatives, ITQ-2-A and MCM-36-A, were hydrothermally synthesized and then modified with copper cations by the ion-exchange method. The samples were characterized with respect to their physicochemical properties, including composition (ICP-OES), structure (XRD, STEM, UV-vis DRS), texture (low-temperature N2-sorption), surface acidity (NH3-TPD), and copper reducibility (H2-TPR). Cu-functionalized zeolites showed enhanced catalytic activity compared to commercial V2O5-TiO2 catalysts. They were found to be active and selective catalysts for the NH3-SCR process, operating effectively in the range of 200-325 °C. NH3-SCR activity strongly depended on the opening of the framework, indicating the micromesoporous structure as an important factor influencing improved NO conversion with ammonia. The formation of NO2, essential for the fast-SCR process, was identified as a crucial step in the reaction mechanism responsible for the low-temperature reduction of nitrogen(II) oxide with ammonia.
Název v anglickém jazyce
NO Conversion with NH3 by Catalysts Derived from Ti-MWW Layered Zeolites with Tailored Porosity
Popis výsledku anglicky
Acid-treated Ti-MCM-22 zeolite and its micromesoporous derivatives, ITQ-2-A and MCM-36-A, were hydrothermally synthesized and then modified with copper cations by the ion-exchange method. The samples were characterized with respect to their physicochemical properties, including composition (ICP-OES), structure (XRD, STEM, UV-vis DRS), texture (low-temperature N2-sorption), surface acidity (NH3-TPD), and copper reducibility (H2-TPR). Cu-functionalized zeolites showed enhanced catalytic activity compared to commercial V2O5-TiO2 catalysts. They were found to be active and selective catalysts for the NH3-SCR process, operating effectively in the range of 200-325 °C. NH3-SCR activity strongly depended on the opening of the framework, indicating the micromesoporous structure as an important factor influencing improved NO conversion with ammonia. The formation of NO2, essential for the fast-SCR process, was identified as a crucial step in the reaction mechanism responsible for the low-temperature reduction of nitrogen(II) oxide with ammonia.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10403 - Physical chemistry
Návaznosti výsledku
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)
Ostatní
Rok uplatnění
2025
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Journal of Physical Chemistry C
ISSN
1932-7447
e-ISSN
1932-7455
Svazek periodika
129
Číslo periodika v rámci svazku
45
Stát vydavatele periodika
US - Spojené státy americké
Počet stran výsledku
13
Strana od-do
20234-20246
Kód UT WoS článku
001608559300001
EID výsledku v databázi Scopus
2-s2.0-105021400209