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

Result code in 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>
Result on the web
<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>

Result language
angličtina
Original language name
Comparison of O2 and NO2 impact on PtOx and PdOx formation in diesel oxidation catalysts and their reduction by CO and C3H6 pulses
Original language description
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.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20401 - Chemical engineering (plants, products)

Project
<a href="/en/project/GA17-26018S" target="_blank" >GA17-26018S: Low temperature reaction kinetics in oxidation catalysts for diesel exhaust gas aftertreatment</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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