Spatiotemporal distribution of NOx storage and impact on NH3 and N2O selectivities during lean/rich cycling of a Ba-based lean NOx trap catalyst
Identifikátory výsledku
Kód výsledku v IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F12%3A43893739" target="_blank" >RIV/60461373:22340/12:43893739 - isvavai.cz</a>
Výsledek na webu
<a href="http://www.sciencedirect.com/science/article/pii/S0920586111007826" target="_blank" >http://www.sciencedirect.com/science/article/pii/S0920586111007826</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.cattod.2011.11.007" target="_blank" >10.1016/j.cattod.2011.11.007</a>
Alternativní jazyky
Jazyk výsledku
angličtina
Název v původním jazyce
Spatiotemporal distribution of NOx storage and impact on NH3 and N2O selectivities during lean/rich cycling of a Ba-based lean NOx trap catalyst
Popis výsledku v původním jazyce
We summarize results from an investigation of the spatiotemporal distribution of NOx storage and intermediate gas species in determining the performance of a fully formulated, Ba-based, lean NOx trap catalyst under lean/rich cycling conditions. By experimentally resolving spatiotemporal profiles of gas composition, we found that stored NOx was significantly redistributed along the monolith axis during the rich phase of the cycle by release and subsequent downstream re-adsorption. Sulfur poisoning of upstream NOx storage sites caused the active NOx-storage zone to be displaced downstream. This axial displacement in turn influenced rich-phase NOx release and re-adsorption. As sulfur poisoning increased, NH3 slip at the catalyst exit also increased due toits formation closer to the catalyst outlet and decreased exposure to downstream oxidation by surface oxygen. N2O formation was found to be associated with nitrate reduction rather than oxidation of NH3 by stored oxygen. We propose that
Název v anglickém jazyce
Spatiotemporal distribution of NOx storage and impact on NH3 and N2O selectivities during lean/rich cycling of a Ba-based lean NOx trap catalyst
Popis výsledku anglicky
We summarize results from an investigation of the spatiotemporal distribution of NOx storage and intermediate gas species in determining the performance of a fully formulated, Ba-based, lean NOx trap catalyst under lean/rich cycling conditions. By experimentally resolving spatiotemporal profiles of gas composition, we found that stored NOx was significantly redistributed along the monolith axis during the rich phase of the cycle by release and subsequent downstream re-adsorption. Sulfur poisoning of upstream NOx storage sites caused the active NOx-storage zone to be displaced downstream. This axial displacement in turn influenced rich-phase NOx release and re-adsorption. As sulfur poisoning increased, NH3 slip at the catalyst exit also increased due toits formation closer to the catalyst outlet and decreased exposure to downstream oxidation by surface oxygen. N2O formation was found to be associated with nitrate reduction rather than oxidation of NH3 by stored oxygen. We propose that
Klasifikace
Druh
J<sub>x</sub> - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)
CEP obor
CI - Průmyslová chemie a chemické inženýrství
OECD FORD obor
—
Návaznosti výsledku
Projekt
—
Návaznosti
N - Vyzkumna aktivita podporovana z neverejnych zdroju
Ostatní
Rok uplatnění
2012
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Catalysis Today
ISSN
0920-5861
e-ISSN
—
Svazek periodika
184
Číslo periodika v rámci svazku
1
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
7
Strana od-do
20-26
Kód UT WoS článku
000303108100004
EID výsledku v databázi Scopus
—