Spatiotemporal distribution of NOx storage and impact on NH3 and N2O selectivities during lean/rich cycling of a Ba-based lean NOx trap catalyst

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>

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

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

—

Projekt

—

Návaznosti

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Rok uplatnění

2012

Kód důvěrnosti údajů

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

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

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