A study of the mechanism for NOx reduction with ethanol on γ-alumina supported silver

Young Hoon Yeom, Meijun Li, Wolfgang M.H. Sachtler, Eric Weitz*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

A multistep mechanism has been elucidated for the reduction of NO x in the presence of added ethanol over Ag/γ-Al 2O3 at 320°C. Under these conditions, ethanol principally reacts with oxygen to form acetaldehyde. Surface acetate ions, which are formed from adsorbed acetaldehyde, react with NO2 to yield nitromethane. Evidence is presented indicating that the aci-anion of nitromethane is an intermediate. In contrast, NOx reduction with ethanol over Ag/γ-Al2O3 at 200°C is inefficient, because surface acetate ions are much less reactive at 200°C than at 320°C. At 200°C, the dominant pathway for ethanol oxidation is reaction with NO2, producing ethyl nitrite, which decomposes into a number of products, including N2O, which is stable under reaction conditions. On the basis of these mechanistic data, conditions can be defined under which NOx reduction with ethanol may be viable.

Original languageEnglish (US)
Pages (from-to)100-110
Number of pages11
JournalJournal of Catalysis
Volume238
Issue number1
DOIs
StatePublished - Feb 15 2006

Keywords

  • Acetaldehyde
  • Aci-anion of nitromethane
  • Ethanol
  • Ethyl nitrite
  • FTIR
  • NO reduction
  • Nitromethane
  • Reactivity of surface acetate

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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