NOx-assisted soot oxidation based on Ag/MnOx-CeO2 mixed oxides

Eun Jun Lee, Min June Kim, Jin Woo Choung, Chang Hwan Kim, Kwan Young Lee

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12 Citations (Scopus)


In previous studies, Ag/CeO2 catalyst showed the high activity on NOx-free soot oxidation. For additional improvement of oxidation activity, Mn was introduced in Ag/CeO2 and NOx-assisted soot oxidation was performed. NOx-assisted soot oxidation activities showed the large difference between the catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed remarkably improved T20 at 349 °C compared with T20 of Ag/CeO2 at 464 °C (each T50 is 391 °C and 400 °C, and each Tmax is 514 °C and 509 °C). NO oxidation activity was increased as the mole ratio of Mn increased, while amount of NO adsorption was increased in Ag/MnOx-CeO2 mixed oxide compared to other catalysts. Especially, Ag/2MnOx-1CeO2 catalysts showed NO oxidation activity at low-temperature and NO desorption at appropriate temperature. As a result, it was confirmed that not only the NO oxidation activity but also the NOx adsorption characteristics are the most important factors in NOx-assisted soot oxidation. Accordingly, Ag/2MnOx-1CeO2 catalysts were proposed as optimal catalysts.

Original languageEnglish
Article number118396
JournalApplied Catalysis A: General
Publication statusPublished - 2021 Oct 25

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) ( NRF-2016R1A5A1009592 ).

Publisher Copyright:
© 2021 Elsevier B.V.


  • Adsorbed NOx
  • Ag/MnO-CeO
  • NO oxidation
  • Soot oxidation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology


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