The role of NO in the mechanism of NOx reduction with ammonia over a BaNa-Y catalyst

Young Hoon Yeom, Juan Henao, Mei Jun Li, Wolfgang M.H. Sachtler, Eric Weitz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

142 Scopus citations


NO reduces HNO3 to HONO and surface nitrates to nitrites on a BaNa-Y zeolite, and it reacts with NO2 to form N2O 3. Data are also presented which show that adsorbed NO+ reacts with water to form HONO. In the presence of NH3 and H 2O these processes lead to the formation of ammonium nitrite, which efficiently decomposes near 100°C to N2 + H2O, effecting the catalytic reduction of NOx to N2. A criterion for this path is that the optimum yield of N2 is obtained with an equimolar mixture of NO + NO2. Since ammonium nitrate, which can also form on this catalyst, does not significantly decompose at 200°C, a typical temperature for diesel exhaust, the reduction of nitrate to nitrite serves to regenerate active sites on the BaNa-Y zeolite.

Original languageEnglish (US)
Pages (from-to)181-193
Number of pages13
JournalJournal of Catalysis
Issue number1
StatePublished - Apr 1 2005


  • Ammonia
  • Ammonium nitrate
  • FT-IR
  • NO reduction mechanism
  • Nitrate ions on zeolites
  • Nitrate reduction on zeolites
  • Nitrous acid

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


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