Effects of SO2 on NO adsorption and NO2 formation over TiO2 low-temperature SCR catalyst

Md Azhar Uddin; Koji Ishibe; Shengji Wu; Caili Su; Eiji Sasaoka

doi:10.1021/ie061631q

Effects of SO₂ on NO adsorption and NO₂ formation over TiO₂ low-temperature SCR catalyst

Md Azhar Uddin, Koji Ishibe, Shengji Wu, Caili Su, Eiji Sasaoka

Institute for Global Human Resource Development

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

18 Citations (Scopus)

Abstract

TiO₂ is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH₃. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO₂ and NO over two kinds of TiO₂ catalysts was investigated using a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effect of the presence of SO₂ on the adsorption of NO over the catalysts and the formation NO₂ from NO was studied. The relationship between the NO₂ formation, the NO adsorption, and the SO₂ adsorption was also studied. The presence of SO₂ was essential for the oxidative adsorption of NO over the catalysts. SO₂ was adsorbed and converted to SO₄ ^2-, then NO adsorbed, on the SO₂ pre-adsorbed catalyst and converted to NO₃^-. The presence of both SO₂ and NO contributed to the formation NO₂ from NO over the TiO ₂ samples. It was found that NO₂ was evolved from an equimolar reaction of NO and SO₂.

Original language	English
Pages (from-to)	1672-1676
Number of pages	5
Journal	Industrial and Engineering Chemistry Research
Volume	46
Issue number	6
DOIs	https://doi.org/10.1021/ie061631q
Publication status	Published - Mar 14 2007

ASJC Scopus subject areas

Chemistry(all)
Chemical Engineering(all)
Industrial and Manufacturing Engineering

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title = "Effects of SO2 on NO adsorption and NO2 formation over TiO2 low-temperature SCR catalyst",

abstract = "TiO2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH3. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO2 and NO over two kinds of TiO2 catalysts was investigated using a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effect of the presence of SO2 on the adsorption of NO over the catalysts and the formation NO2 from NO was studied. The relationship between the NO2 formation, the NO adsorption, and the SO2 adsorption was also studied. The presence of SO2 was essential for the oxidative adsorption of NO over the catalysts. SO2 was adsorbed and converted to SO4 2-, then NO adsorbed, on the SO2 pre-adsorbed catalyst and converted to NO3-. The presence of both SO2 and NO contributed to the formation NO2 from NO over the TiO 2 samples. It was found that NO2 was evolved from an equimolar reaction of NO and SO2.",

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T1 - Effects of SO2 on NO adsorption and NO2 formation over TiO2 low-temperature SCR catalyst

AU - Uddin, Md Azhar

AU - Ishibe, Koji

AU - Wu, Shengji

AU - Su, Caili

AU - Sasaoka, Eiji

PY - 2007/3/14

Y1 - 2007/3/14

N2 - TiO2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH3. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO2 and NO over two kinds of TiO2 catalysts was investigated using a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effect of the presence of SO2 on the adsorption of NO over the catalysts and the formation NO2 from NO was studied. The relationship between the NO2 formation, the NO adsorption, and the SO2 adsorption was also studied. The presence of SO2 was essential for the oxidative adsorption of NO over the catalysts. SO2 was adsorbed and converted to SO4 2-, then NO adsorbed, on the SO2 pre-adsorbed catalyst and converted to NO3-. The presence of both SO2 and NO contributed to the formation NO2 from NO over the TiO 2 samples. It was found that NO2 was evolved from an equimolar reaction of NO and SO2.

AB - TiO2 is known as a low-temperature selective catalyst for the reduction (LT-SCR) of NO with NH3. Furthermore, it is well-known that the oxidation of NO over the catalyst plays an important role in the LT-SCR. Adsorption of SO2 and NO over two kinds of TiO2 catalysts was investigated using a conventional flow type fixed-bed reactor at 100 °C under atmospheric pressure. The effect of the presence of SO2 on the adsorption of NO over the catalysts and the formation NO2 from NO was studied. The relationship between the NO2 formation, the NO adsorption, and the SO2 adsorption was also studied. The presence of SO2 was essential for the oxidative adsorption of NO over the catalysts. SO2 was adsorbed and converted to SO4 2-, then NO adsorbed, on the SO2 pre-adsorbed catalyst and converted to NO3-. The presence of both SO2 and NO contributed to the formation NO2 from NO over the TiO 2 samples. It was found that NO2 was evolved from an equimolar reaction of NO and SO2.

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Effects of SO₂ on NO adsorption and NO₂ formation over TiO₂ low-temperature SCR catalyst

Abstract

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