Reduction of NH4NO3 by NO to N2: Effects of the substrate, and implications for low temperature deNOx catalysis

Aditya Savara*, Wolfgang M.H. Sachtler, Eric Weitz

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

NH4NO3 can form from intermediates present in low temperature (≤ 200 °C) DeNOx reactions. At 200°C, NH4NO3 is thermally stable and has been speculated as a possible poison in low temperature DeNOx catalysis. In this study, we investigated the ability of NO to reduce NH4NO3 to thermally less stable NH4NO2, which decomposes to N2 and H2O at ∼100°C, thus mitigating possible catalyst poisoning. Ground NH4NO3 was physically mixed with different substrates, then exposed to an NO flow at elevated temperature with FTIR monitoring of the effluent. The data show that reduction of neat NH4NO3 by NO takes place above its melting point (170°C), while on weakly acidic substrates reduction of NH4NO3 by NO takes place below 100°C. A possible mechanism for the acid catalyzed reduction of NH4NO3 by NO will be discussed, as well as implications for the effective temperatures for low temperature DeNOx catalysis.

Original languageEnglish (US)
Title of host publication233rd ACS National Meeting, Abstracts of Scientific Papers
StatePublished - Dec 28 2007
Event233rd ACS National Meeting - Chicago, IL, United States
Duration: Mar 25 2007Mar 29 2007

Publication series

NameACS National Meeting Book of Abstracts
ISSN (Print)0065-7727

Other

Other233rd ACS National Meeting
CountryUnited States
CityChicago, IL
Period3/25/073/29/07

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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