Effect of diffusion limitation on the performance of multi-layer oxidation and lean NOx trap catalysts

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902399" target="_blank" >RIV/60461373:22340/16:43902399 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/49777513:23640/16:43929030

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.cattod.2016.03.013" target="_blank" >http://dx.doi.org/10.1016/j.cattod.2016.03.013</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cattod.2016.03.013" target="_blank" >10.1016/j.cattod.2016.03.013</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Effect of diffusion limitation on the performance of multi-layer oxidation and lean NOx trap catalysts

Popis výsledku v původním jazyce

Recent effort in emission control catalyst development aims for saving space and cost by combining different catalytic functions in a single multi-layered monolith reactor. However, the overall efficiency of the converter and particularly the bottom layer performance can be negatively affected by transport limitations. This work investigates transport limitation in double-layer systems consisting of oxidation (DOC) and lean NOx trap (LNT, NOx storage) catalysts. CO/HC oxidation and NOx storage/reduction experiments were carried out in a laboratory reactor. The LNT coating in the tested samples was overlaid with an additional layer that was either inert (?-Al2O3) or catalytically active (DOC). The inert layer served as a diffusion barrier with no catalytic activity to decouple the transport and reaction effects. The hindered transport affected both NOx storage (less efficient initial NOx uptake) and NOx reduction (changes in the selectivity, longer delay of NH3 breakthrough, shift of N2O formation from primary to secondary peak). The presence of DOC layer on the top of LNT improved the catalytic performance at lower temperatures by increasing the effective NOx storage capacity (due to NO oxidation activity) and improved regeneration efficiency (due to water gas shift, steam reforming and NH3 re-oxidation). ? 2016 Elsevier B.V.

Název v anglickém jazyce

Effect of diffusion limitation on the performance of multi-layer oxidation and lean NOx trap catalysts

Popis výsledku anglicky

Recent effort in emission control catalyst development aims for saving space and cost by combining different catalytic functions in a single multi-layered monolith reactor. However, the overall efficiency of the converter and particularly the bottom layer performance can be negatively affected by transport limitations. This work investigates transport limitation in double-layer systems consisting of oxidation (DOC) and lean NOx trap (LNT, NOx storage) catalysts. CO/HC oxidation and NOx storage/reduction experiments were carried out in a laboratory reactor. The LNT coating in the tested samples was overlaid with an additional layer that was either inert (?-Al2O3) or catalytically active (DOC). The inert layer served as a diffusion barrier with no catalytic activity to decouple the transport and reaction effects. The hindered transport affected both NOx storage (less efficient initial NOx uptake) and NOx reduction (changes in the selectivity, longer delay of NH3 breakthrough, shift of N2O formation from primary to secondary peak). The presence of DOC layer on the top of LNT improved the catalytic performance at lower temperatures by increasing the effective NOx storage capacity (due to NO oxidation activity) and improved regeneration efficiency (due to water gas shift, steam reforming and NH3 re-oxidation). ? 2016 Elsevier B.V.

Druh

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

CEP obor

CI - Průmyslová chemie a chemické inženýrství

OECD FORD obor

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Projekt

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

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

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

273

Číslo periodika v rámci svazku

273

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

9

Strana od-do

112-120

Kód UT WoS článku

000377386900014

EID výsledku v databázi Scopus

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