Comparison of O2 and NO2 impact on PtOx and PdOx formation in diesel oxidation catalysts and their reduction by CO and C3H6 pulses

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22340%2F19%3A43919366" target="_blank" >RIV/60461373:22340/19:43919366 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S1385894718315043?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S1385894718315043?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.cej.2018.08.040" target="_blank" >10.1016/j.cej.2018.08.040</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Comparison of O2 and NO2 impact on PtOx and PdOx formation in diesel oxidation catalysts and their reduction by CO and C3H6 pulses

Popis výsledku v původním jazyce

NO oxidation on diesel oxidation catalyst (DOC) increases NO2/NO ratio in the exhaust gas, which is beneficial for both NOx reduction and soot oxidation processes in the catalysts and filters located downstream, such as SCR, LNT and DPF. The impact of O2 and NO2 on the PtOx and PdOx formation and subsequent changes in NO oxidation activity was studied on Pt/γ-Αl2O3 and Pd/γ-Αl2O3 catalysts. Repeated heat-up and cool-down temperature ramps in the range of 80–450 °C and isothermal deactivation/reactivation experiments at 150, 175 and 200 °C with NO oxidation as a probe reaction were performed. Inverse hysteresis of NO2 yield during temperature ramps was observed with both catalysts. Though NO2 is stronger oxidizing agent than O2, PtOx and PdOx formation was induced to a similar extent by both O2 and NO2 when present at their typical concentration levels (8% O2, 250 ppm NO2). The NO oxidation activity of both Pt and Pd sites was restored by CO or C3H6 pulses while keeping overall lean conditions (excess of oxygen). The maximum efficiency of CO pulses was achieved at 200 °C for PtOx reduction, and at 150 °C for PdOx reduction. © 2018 Elsevier B.V.

Název v anglickém jazyce

Comparison of O2 and NO2 impact on PtOx and PdOx formation in diesel oxidation catalysts and their reduction by CO and C3H6 pulses

Popis výsledku anglicky

NO oxidation on diesel oxidation catalyst (DOC) increases NO2/NO ratio in the exhaust gas, which is beneficial for both NOx reduction and soot oxidation processes in the catalysts and filters located downstream, such as SCR, LNT and DPF. The impact of O2 and NO2 on the PtOx and PdOx formation and subsequent changes in NO oxidation activity was studied on Pt/γ-Αl2O3 and Pd/γ-Αl2O3 catalysts. Repeated heat-up and cool-down temperature ramps in the range of 80–450 °C and isothermal deactivation/reactivation experiments at 150, 175 and 200 °C with NO oxidation as a probe reaction were performed. Inverse hysteresis of NO2 yield during temperature ramps was observed with both catalysts. Though NO2 is stronger oxidizing agent than O2, PtOx and PdOx formation was induced to a similar extent by both O2 and NO2 when present at their typical concentration levels (8% O2, 250 ppm NO2). The NO oxidation activity of both Pt and Pd sites was restored by CO or C3H6 pulses while keeping overall lean conditions (excess of oxygen). The maximum efficiency of CO pulses was achieved at 200 °C for PtOx reduction, and at 150 °C for PdOx reduction. © 2018 Elsevier B.V.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

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

Chemical Engineering Journal

ISSN

1385-8947

e-ISSN

—

Svazek periodika

377

Číslo periodika v rámci svazku

Neuvedeno

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

—

Kód UT WoS článku

000489122300029

EID výsledku v databázi Scopus

2-s2.0-85051983073