The impact of CO and C3H6 pulses on PtOx reduction and NO oxidation in a diesel oxidation catalyst

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F16%3A43902153" target="_blank" >RIV/60461373:22340/16:43902153 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.apcatb.2015.08.004" target="_blank" >http://dx.doi.org/10.1016/j.apcatb.2015.08.004</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcatb.2015.08.004" target="_blank" >10.1016/j.apcatb.2015.08.004</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The impact of CO and C3H6 pulses on PtOx reduction and NO oxidation in a diesel oxidation catalyst

Popis výsledku v původním jazyce

A reversible deactivation of a diesel oxidation catalyst (DOC) due to the platinum oxide (PtOx) formation is observed under lean conditions. Among others, the gradual build-up of PtOx leads to a decreasing activity for NO oxidation. It is known that PtOx formation is caused by O-2 and NO2 present in the gas mixture and that platinum oxide can be reduced by NO at lower temperatures or thermally decomposed at high temperatures. In this paper we present experimental and modeling results showing that PtOx can be reduced also by CO and C3H6 pulses. First, temperature ramps from 120 to 420 degrees C and back to 120 degrees C were performed with a constant inlet gas composition starting with a reduced catalyst. A higher NO oxidation activity was observed during the heat-up phase than during the subsequent cool-down phase, indicating formation of PtOx. The catalytic activity during the cool-down ramp was partially restored by pulses with an increased CO and C3H6 concentration (while still keeping lean conditions). The maximum effect of pulses was observed around the light-off temperature for CO and C3H6 oxidation. A global kinetic model was developed, considering PtOx existence and its reduction by CO and C3H6 pulses. The model was further validated by isothermal experiments, showing gradual decrease of NO oxidation activity and its recovery by CO and C3H6 at several different temperatures.

Název v anglickém jazyce

The impact of CO and C3H6 pulses on PtOx reduction and NO oxidation in a diesel oxidation catalyst

Popis výsledku anglicky

A reversible deactivation of a diesel oxidation catalyst (DOC) due to the platinum oxide (PtOx) formation is observed under lean conditions. Among others, the gradual build-up of PtOx leads to a decreasing activity for NO oxidation. It is known that PtOx formation is caused by O-2 and NO2 present in the gas mixture and that platinum oxide can be reduced by NO at lower temperatures or thermally decomposed at high temperatures. In this paper we present experimental and modeling results showing that PtOx can be reduced also by CO and C3H6 pulses. First, temperature ramps from 120 to 420 degrees C and back to 120 degrees C were performed with a constant inlet gas composition starting with a reduced catalyst. A higher NO oxidation activity was observed during the heat-up phase than during the subsequent cool-down phase, indicating formation of PtOx. The catalytic activity during the cool-down ramp was partially restored by pulses with an increased CO and C3H6 concentration (while still keeping lean conditions). The maximum effect of pulses was observed around the light-off temperature for CO and C3H6 oxidation. A global kinetic model was developed, considering PtOx existence and its reduction by CO and C3H6 pulses. The model was further validated by isothermal experiments, showing gradual decrease of NO oxidation activity and its recovery by CO and C3H6 at several different temperatures.

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

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

Applied Catalysis B:Environment

ISSN

0926-3373

e-ISSN

—

Svazek periodika

181

Číslo periodika v rámci svazku

181

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

644-650

Kód UT WoS článku

000364256000062

EID výsledku v databázi Scopus

—