Interaction between soot and stored NO x during operation of LNT Pt-Ba/Al 2O 3 catalysts

Roberto Matarrese, Nancy Artioli, Lidia Castoldi, Luca Lietti*, Pio Forzatti

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

The interaction of soot with nitrates stored on a model PtBa/Al 2O 3 LNT catalyst sample is here investigated under realistic conditions, i.e. upon lean/rich cycling in the presence of water and CO 2. The presence of soot inhibits the NO x storage capacity of the catalyst during the lean phase at different temperatures, in the range 200-350°C, but does not affect significantly the regeneration process of the stored nitrates. Simultaneously with the NO x storage, soot is converted to CO 2 at temperatures above 300°C. Soot is oxidized by NO 2 formed by NO oxidation on Pt sites, but the participation of the stored nitrates in the soot oxidation is also likely, as pointed out by TPD/TPO experiments showing the occurrence of a surface reaction involving soot and the stored nitrates.

Original languageEnglish
Pages (from-to)271-278
Number of pages8
JournalCatalysis Today
Volume184
Issue number1
DOIs
Publication statusPublished - 30 Apr 2012
Externally publishedYes

Keywords

  • Diesel particulate NO reduction
  • DPNR catalysts
  • NSR catalysts
  • Simultaneous NO and soot removal
  • Soot oxidation

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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