Dynamics of Two-Step CO Oxidation Light-Off on Pt/-Al2O3 and Pd/-Al2O3 in the Presence of C3H6

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43919369" target="_blank" >RIV/60461373:22340/19:43919369 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007%2Fs11244-018-1129-5" target="_blank" >https://link.springer.com/article/10.1007%2Fs11244-018-1129-5</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11244-018-1129-5" target="_blank" >10.1007/s11244-018-1129-5</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Dynamics of Two-Step CO Oxidation Light-Off on Pt/-Al2O3 and Pd/-Al2O3 in the Presence of C3H6

Popis výsledku v původním jazyce

Although the kinetics of CO and hydrocarbon (HC) oxidation reactions on three-way catalyst and diesel oxidation catalysts for automotive exhaust gas aftertreatment has been studied for a couple of decades, there are still some phenomena affecting the catalyst performance and pollutant conversion that need to be better understood and controlled. Two-step CO light-off is an undesired effect that significantly delays the process of reaching full CO conversion in the exhaust gas mixture including also hydrocarbons. In such a case CO light-off curve exhibits a plateau or shoulder where the CO conversion does not increase or even temporarily decreases with temperature, though there is enough O2 available for both CO and HC oxidation. The onset of hydrocarbon oxidation may inhibit the CO conversion due to blocking of active catalytic sites by adsorbed reaction intermediates. Furthermore, CO can be released as a by-product of the hydrocarbon oxidation. In this contribution we present the results of a systematic experimental study exploring these phenomena on Pt/-Al2O3 and Pd/-Al2O3 catalysts. Pt/-Al2O3 showed larger decrease of CO conversion caused by accumulation of the surface intermediates. On the contrary, the production of CO by incomplete C3H6 oxidation was higher on Pd/-Al2O3. Overall extent of the two-step CO light-off effect was higher on Pt/-Al2O3.

Název v anglickém jazyce

Dynamics of Two-Step CO Oxidation Light-Off on Pt/-Al2O3 and Pd/-Al2O3 in the Presence of C3H6

Popis výsledku anglicky

Although the kinetics of CO and hydrocarbon (HC) oxidation reactions on three-way catalyst and diesel oxidation catalysts for automotive exhaust gas aftertreatment has been studied for a couple of decades, there are still some phenomena affecting the catalyst performance and pollutant conversion that need to be better understood and controlled. Two-step CO light-off is an undesired effect that significantly delays the process of reaching full CO conversion in the exhaust gas mixture including also hydrocarbons. In such a case CO light-off curve exhibits a plateau or shoulder where the CO conversion does not increase or even temporarily decreases with temperature, though there is enough O2 available for both CO and HC oxidation. The onset of hydrocarbon oxidation may inhibit the CO conversion due to blocking of active catalytic sites by adsorbed reaction intermediates. Furthermore, CO can be released as a by-product of the hydrocarbon oxidation. In this contribution we present the results of a systematic experimental study exploring these phenomena on Pt/-Al2O3 and Pd/-Al2O3 catalysts. Pt/-Al2O3 showed larger decrease of CO conversion caused by accumulation of the surface intermediates. On the contrary, the production of CO by incomplete C3H6 oxidation was higher on Pd/-Al2O3. Overall extent of the two-step CO light-off effect was higher on Pt/-Al2O3.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20401 - Chemical engineering (plants, products)

Projekt

<a href="/cs/project/GA17-26018S" target="_blank" >GA17-26018S: Reakční kinetika v oxidačních katalyzátorech pro konverzi dieselových výfukových plynů za nízkých teplot</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Topics in Catalysis

ISSN

1022-5528

e-ISSN

—

Svazek periodika

62

Číslo periodika v rámci svazku

1-4

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

252-258

Kód UT WoS článku

000461821000032

EID výsledku v databázi Scopus

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