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

doi:10.1016/j.jcat.2005.01.014

The role of NO in the mechanism of NO_x 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

Chemistry

Research output: Contribution to journal › Article › peer-review

142 Scopus citations

Abstract

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 NO_x 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 language	English (US)
Pages (from-to)	181-193
Number of pages	13
Journal	Journal of Catalysis
Volume	231
Issue number	1
DOIs	https://doi.org/10.1016/j.jcat.2005.01.014
State	Published - Apr 1 2005

Keywords

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

Access to Document

10.1016/j.jcat.2005.01.014

Cite this

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

abstract = "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.",

keywords = "Ammonia, Ammonium nitrate, FT-IR, NO reduction mechanism, Nitrate ions on zeolites, Nitrate reduction on zeolites, Nitrous acid",

author = "Yeom, {Young Hoon} and Juan Henao and Li, {Mei Jun} and Sachtler, {Wolfgang M.H.} and Eric Weitz",

note = "Funding Information: This work was supported by the EMSI program of the National Science Foundation and the U.S. Department of Energy, Office of Science (CHE-9810378) and by Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, Grant No. DE-FG02-03ER15457 at the Northwestern University Istitute for Environmental Catalysis. ",

year = "2005",

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doi = "10.1016/j.jcat.2005.01.014",

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pages = "181--193",

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T1 - The role of NO in the mechanism of NOx reduction with ammonia over a BaNa-Y catalyst

AU - Yeom, Young Hoon

AU - Henao, Juan

AU - Li, Mei Jun

AU - Sachtler, Wolfgang M.H.

AU - Weitz, Eric

N1 - Funding Information: This work was supported by the EMSI program of the National Science Foundation and the U.S. Department of Energy, Office of Science (CHE-9810378) and by Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, Grant No. DE-FG02-03ER15457 at the Northwestern University Istitute for Environmental Catalysis.

PY - 2005/4/1

Y1 - 2005/4/1

N2 - 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.

AB - 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.

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KW - NO reduction mechanism

KW - Nitrate ions on zeolites

KW - Nitrate reduction on zeolites

KW - Nitrous acid

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