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

Research output: Contribution to journalArticlepeer-review

Abstract

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
Volume627
DOIs
Publication statusPublished - 2021 Oct 25

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'NOx-assisted soot oxidation based on Ag/MnO<sub>x</sub>-CeO<sub>2</sub> mixed oxides'. Together they form a unique fingerprint.

Cite this