Global kinetic model of NO oxidation on Pd/gamma-Al2O3 catalyst including PdOx formation and reduction by CO and C3H6

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F20%3A43921256" target="_blank" >RIV/60461373:22340/20:43921256 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.apcatb.2019.118141" target="_blank" >https://doi.org/10.1016/j.apcatb.2019.118141</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.apcatb.2019.118141" target="_blank" >10.1016/j.apcatb.2019.118141</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Global kinetic model of NO oxidation on Pd/gamma-Al2O3 catalyst including PdOx formation and reduction by CO and C3H6

Popis výsledku v původním jazyce

Pd is often used in diesel oxidation catalysts (DOC) together with Pt to ensure thermal stability and durability. Besides CO and hydrocarbon oxidation, NO oxidation is important for the function of subsequent converters in the exhaust line, such as SCR and DPF. Though Pt sites exhibit a significantly higher NO oxidation rate, Pd also provide some catalytic activity for this reaction and therefore affect the overall NO2 yield in DOC. Palladium oxides (PdOx) formation decreases the NO oxidation activity like PtOx. We present a global kinetic model for Pd/gamma-Al2O3 catalyst considering standard DOC reactions extended with the PdOx formation and its influence on the NO2 yield. The dynamics of transition between the metallic Pd and oxidized PdOx state is studied in repeated temperature ramps and isothermal deactivation experiments, revealing the individual impact of O-2 and NO2. The model describes well a dual NO oxidation light-off behavior observed in the experiments.

Název v anglickém jazyce

Global kinetic model of NO oxidation on Pd/gamma-Al2O3 catalyst including PdOx formation and reduction by CO and C3H6

Popis výsledku anglicky

Pd is often used in diesel oxidation catalysts (DOC) together with Pt to ensure thermal stability and durability. Besides CO and hydrocarbon oxidation, NO oxidation is important for the function of subsequent converters in the exhaust line, such as SCR and DPF. Though Pt sites exhibit a significantly higher NO oxidation rate, Pd also provide some catalytic activity for this reaction and therefore affect the overall NO2 yield in DOC. Palladium oxides (PdOx) formation decreases the NO oxidation activity like PtOx. We present a global kinetic model for Pd/gamma-Al2O3 catalyst considering standard DOC reactions extended with the PdOx formation and its influence on the NO2 yield. The dynamics of transition between the metallic Pd and oxidized PdOx state is studied in repeated temperature ramps and isothermal deactivation experiments, revealing the individual impact of O-2 and NO2. The model describes well a dual NO oxidation light-off behavior observed in the experiments.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

20402 - Chemical process engineering

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

2020

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

260

Číslo periodika v rámci svazku

Neuveden

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

118141

Kód UT WoS článku

000496894300049

EID výsledku v databázi Scopus

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