Characteristics of the low temperature SCR of NOx with NH3 over TiO2

Md Azhar Uddin; Koichiro Shimizu; Koji Ishibe; Eiji Sasaoka

doi:10.1016/j.molcata.2009.06.002

Characteristics of the low temperature SCR of NO_x with NH₃ over TiO₂

Md Azhar Uddin, Koichiro Shimizu, Koji Ishibe, Eiji Sasaoka

Institute for Global Human Resource Development

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

33 Citations (Scopus)

Abstract

Low temperature selective catalytic reduction (LT-SCR) of NO + NO₂ mixture with NH₃ was investigated over TiO₂, SiO₂ and activated carbon in a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effects of gas composition such as presence of SO₂ and NH₃ and the ratio of NO₂/NO in the feed-stream on the LT-SCR have been studied. The presence of SO₂ and O₂ was essential for the selective removal of NO with NH₃ over TiO₂. The presence of SO₂ contributed to the oxidation of NO to NO₂ over TiO₂. If NO₂ existed with NO in the reaction system, the presence of SO₂ was not necessary for the removal of NO over TiO₂. The following two reactions were suggested to occur over TiO₂: NO + NO₂ + 2NH₃ → 2N₂ + 3H₂O (1) and 2NO₂ + 2NH₃ → N₂ + NH₄NO₃ + H₂O (2). The reaction (2) occurred on all three catalysts, however the reaction (1) did not proceed significantly over SiO₂.

Original language	English
Pages (from-to)	178-183
Number of pages	6
Journal	Journal of Molecular Catalysis A: Chemical
Volume	309
Issue number	1-2
DOIs	https://doi.org/10.1016/j.molcata.2009.06.002
Publication status	Published - Aug 18 2009

Keywords

Activated carbon
Low temperature SCR
NO
SiO
TiO

ASJC Scopus subject areas

Catalysis
Process Chemistry and Technology
Physical and Theoretical Chemistry

Access to Document

10.1016/j.molcata.2009.06.002

Cite this

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title = "Characteristics of the low temperature SCR of NOx with NH3 over TiO2",

abstract = "Low temperature selective catalytic reduction (LT-SCR) of NO + NO2 mixture with NH3 was investigated over TiO2, SiO2 and activated carbon in a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effects of gas composition such as presence of SO2 and NH3 and the ratio of NO2/NO in the feed-stream on the LT-SCR have been studied. The presence of SO2 and O2 was essential for the selective removal of NO with NH3 over TiO2. The presence of SO2 contributed to the oxidation of NO to NO2 over TiO2. If NO2 existed with NO in the reaction system, the presence of SO2 was not necessary for the removal of NO over TiO2. The following two reactions were suggested to occur over TiO2: NO + NO2 + 2NH3 → 2N2 + 3H2O (1) and 2NO2 + 2NH3 → N2 + NH4NO3 + H2O (2). The reaction (2) occurred on all three catalysts, however the reaction (1) did not proceed significantly over SiO2.",

keywords = "Activated carbon, Low temperature SCR, NO, SiO, TiO",

author = "Uddin, {Md Azhar} and Koichiro Shimizu and Koji Ishibe and Eiji Sasaoka",

note = "Funding Information: This work was supported by 21th COE program of Okayama University.",

year = "2009",

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doi = "10.1016/j.molcata.2009.06.002",

language = "English",

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T1 - Characteristics of the low temperature SCR of NOx with NH3 over TiO2

AU - Uddin, Md Azhar

AU - Shimizu, Koichiro

AU - Ishibe, Koji

AU - Sasaoka, Eiji

N1 - Funding Information: This work was supported by 21th COE program of Okayama University.

PY - 2009/8/18

Y1 - 2009/8/18

N2 - Low temperature selective catalytic reduction (LT-SCR) of NO + NO2 mixture with NH3 was investigated over TiO2, SiO2 and activated carbon in a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effects of gas composition such as presence of SO2 and NH3 and the ratio of NO2/NO in the feed-stream on the LT-SCR have been studied. The presence of SO2 and O2 was essential for the selective removal of NO with NH3 over TiO2. The presence of SO2 contributed to the oxidation of NO to NO2 over TiO2. If NO2 existed with NO in the reaction system, the presence of SO2 was not necessary for the removal of NO over TiO2. The following two reactions were suggested to occur over TiO2: NO + NO2 + 2NH3 → 2N2 + 3H2O (1) and 2NO2 + 2NH3 → N2 + NH4NO3 + H2O (2). The reaction (2) occurred on all three catalysts, however the reaction (1) did not proceed significantly over SiO2.

AB - Low temperature selective catalytic reduction (LT-SCR) of NO + NO2 mixture with NH3 was investigated over TiO2, SiO2 and activated carbon in a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effects of gas composition such as presence of SO2 and NH3 and the ratio of NO2/NO in the feed-stream on the LT-SCR have been studied. The presence of SO2 and O2 was essential for the selective removal of NO with NH3 over TiO2. The presence of SO2 contributed to the oxidation of NO to NO2 over TiO2. If NO2 existed with NO in the reaction system, the presence of SO2 was not necessary for the removal of NO over TiO2. The following two reactions were suggested to occur over TiO2: NO + NO2 + 2NH3 → 2N2 + 3H2O (1) and 2NO2 + 2NH3 → N2 + NH4NO3 + H2O (2). The reaction (2) occurred on all three catalysts, however the reaction (1) did not proceed significantly over SiO2.

KW - Activated carbon

KW - Low temperature SCR

KW - NO

KW - SiO

KW - TiO

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