Ammonia reactions with the stored oxygen in a commercial lean NOx trap catalyst

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F15%3A43900082" target="_blank" >RIV/60461373:22340/15:43900082 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/26722445:_____/15:#0001044

Výsledek na webu

<a href="http://www.sciencedirect.com/science/article/pii/S1385894714013114" target="_blank" >http://www.sciencedirect.com/science/article/pii/S1385894714013114</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2014.09.115" target="_blank" >10.1016/j.cej.2014.09.115</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Ammonia reactions with the stored oxygen in a commercial lean NOx trap catalyst

Popis výsledku v původním jazyce

Ammonia is an important intermediate of the NOx reduction in a NOx storage and reduction catalyst (aka lean NOx trap). NH3 formed under rich conditions in the reduced front part of the catalyst is transported by convection downstream to the unregenerated(still oxidized) zone of the catalyst, where it further reacts with the stored oxygen and NOx. In this paper, the kinetics and selectivity of NH3 reactions with the stored oxygen are studied in detail with a commercial Ba-based NOx storage catalyst containing platinum group metals (PGM), Ba and Ce oxides. Furthermore, steady-state NH3 decomposition, NH3 oxidation by O2 and NO, and N2O decomposition are examined in light-off experiments. Periodic lean/rich cycling is measured first with O2 and NH3, andthen with NOx + O2 and NH3 to discriminate between the NH3 reactions with the stored oxygen and the stored NOx. The reaction of NH3 with the stored O2 is highly selective towards N2, however a certain amount of NOx and N2O is also formed.

Název v anglickém jazyce

Ammonia reactions with the stored oxygen in a commercial lean NOx trap catalyst

Popis výsledku anglicky

Ammonia is an important intermediate of the NOx reduction in a NOx storage and reduction catalyst (aka lean NOx trap). NH3 formed under rich conditions in the reduced front part of the catalyst is transported by convection downstream to the unregenerated(still oxidized) zone of the catalyst, where it further reacts with the stored oxygen and NOx. In this paper, the kinetics and selectivity of NH3 reactions with the stored oxygen are studied in detail with a commercial Ba-based NOx storage catalyst containing platinum group metals (PGM), Ba and Ce oxides. Furthermore, steady-state NH3 decomposition, NH3 oxidation by O2 and NO, and N2O decomposition are examined in light-off experiments. Periodic lean/rich cycling is measured first with O2 and NH3, andthen with NOx + O2 and NH3 to discriminate between the NH3 reactions with the stored oxygen and the stored NOx. The reaction of NH3 with the stored O2 is highly selective towards N2, however a certain amount of NOx and N2O is also formed.

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

<a href="/cs/project/LH12086" target="_blank" >LH12086: Analýza, modelování a řízení časoprostorových koncentračních profilů v katalyzátorech pro redukci oxidů dusíku (deNOx) v automobilových výfukových plynech</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název periodika

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

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Svazek periodika

278

Číslo periodika v rámci svazku

neuveden

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

8

Strana od-do

199-206

Kód UT WoS článku

000357907800026

EID výsledku v databázi Scopus

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