NOx-assisted soot oxidation with alkaline-earth metals (Ca, Sr, Ba) loaded on Ag/2MnOx-1CeO2

Eun Jun Lee, Kwan Young Lee

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1 Citation (Scopus)

Abstract

Previously, we demonstrated that Ag/2MnOx-1CeO2 is the optimal catalyst for NOx-assisted soot oxidation and that the amount of NOx adsorption is major factor for NOx-assisted soot oxidation activity. Thus, in this study, alkaline-earth metals were introduced into Ag/2MnOx-1CeO2 to promote NOx-assisted soot oxidation activity by increasing NOx adsorption. As a results, Ag(Er)/2MnOx-1CeO2 catalysts exhibited enhanced NOx adsorption, which improved their NOx-assisted soot oxidation activity compared with that of Ag/2MnOx-1CeO2. Among them, AgSr/2MnOx-1CeO2 and AgBa/2MnOx-1CeO2 exhibited high NOx adsorption capacity. In particular, AgSr/2MnOx-1CeO2 greatly improved NOx-assisted soot oxidation activity by desorbing NOx at an appropriate temperature (approximately 350 °C). On the other hand, AgBa/2MnOx-1CeO2 adsorbed NOx even at high temperature, so its NOx-assisted soot oxidation activity was lower than that of AgSr/2MnOx-1CeO2. Therefore, the T20 of AgSr/2MnOx-1CeO2 decreased to 80 °C compared with Ag/2MnOx-1CeO2. Consequently, the developed AgSr/2MnOx-1CeO2 catalyst is an optimal catalyst for NOx-assisted soot oxidation activity compared to existing catalysts. Finally, this study demonstrates that the increase in NOx adsorption enhances the NOx-assisted soot oxidation activity, but the NOx desorption temperature is a more important factors for improving the NOx-assisted soot oxidation activity.

Original languageEnglish
Article number111312
JournalJournal of Environmental Chemical Engineering
Volume11
Issue number6
DOIs
Publication statusPublished - 2023 Dec

Bibliographical note

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • Adsorbed NOx
  • Ag(Er)/MnO-CeO
  • Alkaline-earth metal
  • Desorption temperature
  • NOx-assisted soot oxidation

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

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