Effects of La incorporation in catalytic activity of Ag/La-CeO2 catalysts for soot oxidation

Jaesung Lee, Min Woo Lee, Min June Kim, Jae Hwan Lee, Eun Jun Lee, Chang Ho Jung, Jin Woo Choung, Chang Hwan Kim, Kwan Young Lee

Research output: Contribution to journalArticlepeer-review

Abstract

Owing to strengthened regulations toward vehicle emissions, the use of diesel particulate filter technology to reduce particulate matter emissions has attracted significant attention. To achieve low temperature oxidation of particulate matter, numerous studies on Ag/CeO2 catalysts for soot oxidation have been reported. Herein, Ag/La-CeO2 catalysts with different La contents are synthesized and compared to analyze the effect of La. Hydrogen temperature programmed reduction analysis confirms that the reducibility increases with an increase in the La content in La-CeO2. X-ray photoelectron spectroscopy and Raman analysis confirm an increase of oxygen vacancies with La doping. Accordingly, the soot oxidation performances estimated by temperature programmed oxidation experiments increase with La doping. However, the catalytic activity of Ag/La-CeO2 exhibits a volcano trend. When an appropriate amount of La is incorporated in Ag/CeO2, peroxide generation and reducibility improve, thereby enhancing the soot oxidation performance. Conversely, the catalytic activities gradually decrease with excess La-doping. Scanning transmission electron microscopy analysis and density functional theory calculations confirm that excess amounts of La induce the sintering of Ag particles, which lead to the degradation of peroxide generation and reducibility of the catalysts. Consequently, an optimal amount of La incorporation on Ag/La-CeO2 results in the best soot oxidation performance.

Original languageEnglish
Article number125523
JournalJournal of hazardous materials
Volume414
DOIs
Publication statusPublished - 2021 Jul 15

Keywords

  • Ag/La-CeO2
  • Diesel soot oxidation
  • Oxygen vacancy
  • Reducibility
  • Sintering

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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