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

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

Chemistry

Research output: Chapter in Book/Report/Conference proceeding › Conference 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 language	English (US)
Title of host publication	233rd ACS National Meeting, Abstracts of Scientific Papers
State	Published - Dec 28 2007
Event	233rd ACS National Meeting - Chicago, IL, United States Duration: Mar 25 2007 → Mar 29 2007

Publication series

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

Other

Other	233rd ACS National Meeting
Country	United States
City	Chicago, IL
Period	3/25/07 → 3/29/07

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)

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@inproceedings{790ada7d4c4d4ec7a4e5dde950f88286,

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

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.",

author = "Aditya Savara and Sachtler, {Wolfgang M.H.} and Eric Weitz",

year = "2007",

month = dec,

day = "28",

language = "English (US)",

isbn = "084127438X",

series = "ACS National Meeting Book of Abstracts",

booktitle = "233rd ACS National Meeting, Abstracts of Scientific Papers",

note = "233rd ACS National Meeting ; Conference date: 25-03-2007 Through 29-03-2007",

}

TY - GEN

T1 - Reduction of NH4NO3 by NO to N2

T2 - 233rd ACS National Meeting

AU - Savara, Aditya

AU - Sachtler, Wolfgang M.H.

AU - Weitz, Eric

PY - 2007/12/28

Y1 - 2007/12/28

N2 - 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.

AB - 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.

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M3 - Conference contribution

AN - SCOPUS:37349128222

SN - 084127438X

SN - 9780841274389

T3 - ACS National Meeting Book of Abstracts

BT - 233rd ACS National Meeting, Abstracts of Scientific Papers

Y2 - 25 March 2007 through 29 March 2007

ER -