Pathways for N 2 and N 2O formation during the reduction of NO x over Pt-Ba/Al 2O 3 LNT catalysts investigated by labeling isotopic experiments

L. Lietti*, N. Artioli, L. Righini, L. Castoldi, P. Forzatti

*Corresponding author for this work

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

Mechanistic aspects involved in the formation of N 2 and of N 2O during the reduction of gas-phase NO and of NO x stored over a model PtBa/Al 2O 3 NSR catalyst are investigated using unlabeled ammonia and labeled NO. The reduction of the stored NO x species (labeled nitrites and nitrates) with NH 3 leads to the selective formation of N 2 as a major product and of small amounts of nitrous oxide. Based on the nitrogen isotopic distribution, it appears that N 2 formation occurs primarily through the statistical coupling of N-atoms formed by dissociation of NO x- and NH 3-related surface intermediates, although an SCR-pathway (involving the coupling of NH 3- and NO-derived ad-species) is also likely to occur. It appears as well that the formation of nitrous oxide involves either the coupling of two adsorbed NO molecules or the recombination of an adsorbed NO molecule with an adsorbed NH x fragment.

Original languageEnglish
Pages (from-to)7597-7605
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume51
Issue number22
DOIs
Publication statusPublished - 06 Jun 2012
Externally publishedYes

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)
  • Industrial and Manufacturing Engineering

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