Ceria-Based Catalysts for Low Temperature NOx Storage and Release

Samantha Jones, Yaying Ji, Mark Crocker

Research output: Contribution to journalArticlepeer-review

57 Scopus citations

Abstract

CeO2 promoted with either 1 wt% Pt or 1 wt% Pd was evaluated as a model system for passive NOx adsorber applications. According to NOx storage experiments conducted over the temperature range 80-160 °C, promotion with Pt resulted in higher NOx storage efficiencies than for the Pd-promoted material. However, for NOx storage at 80 and 120 °C, the latter released more NOx below 350 °C during temperature-programmed desorption in relative and absolute terms, the Pt analog releasing most of its stored NOx above 350 °C. DRIFT spectra showed that the use of Pd leads to preferential adsorption of NOx in the form of nitrites, while predominately nitrate formation is observed over the Pt promoted material. Overall, the use of Pd promoted CeO2 is preferred for low temperature NOx storage and release due to its ability to store NOx as thermally labile nitrites.

Original languageEnglish
Pages (from-to)909-917
Number of pages9
JournalCatalysis Letters
Volume146
Issue number5
DOIs
StatePublished - May 2016

Bibliographical note

Publisher Copyright:
© 2016 Springer Science+Business Media New York.

Keywords

  • Ceria
  • DRIFTS
  • Palladium
  • Passive NO adsorber
  • Platinum

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry

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