Effect of SO<sub>2</sub> on NH<sub>3</sub> oxidation over a Cu-SAPO-34 SCR catalyst

Jangjou, Yasser; Ali, Mustafa; Chang, Qingyun; Wang, Di; Li, Junhui; Kumar, Ashok; Epling, William S.

doi:10.1039/c5cy02212f

Cited by 40 publications

(34 citation statements)

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“…Only a 12.6% reduction in the specific surface area was found for S-Cu-22. The sulfur species formation, caused by pore blocking, accounts for the reduction in the specific surface area, which agrees with many other studies [20,[28][29][30]. The result suggests that the CHA structure holds integrity during SO x sulfation.…”

Section: Bet and Xrd Resultssupporting

confidence: 91%

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

et al. 2019

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To reveal the role of SO 3 poisoning in Cu/SSZ-13 NH 3 -SCR catalysts, fresh and sulfated Cu/SSZ-13 catalysts were prepared in the presence or absence of SO 3 flux. The deactivation mechanism is probed by the changes of structural, copper species, and selective catalytic reduction (SCR) activity. The variations concentrate on the changes of copper species as the Chabazite (CHA) framework of Cu/SSZ-13 catalysts could keep intact at high ratios of SO 3 /SO x . The thermal gravimetric analyzer (TGA) results reveal that the copper sulfate formed during sulfation and the amounts of sulfate species increased with an increase in the SO 3 /SO x ratio. In contrast to the changing trend of copper sulfate, temperature program reduction (H 2 -TPR), and electron paramagnetic resonance (EPR) results manifest that, since the number of active copper ions declines with an increase of the SO 3/ SO x ratio, the active sites transform to these inactive species during sulfation. Due to the combination of NH 3 -SCR activity and the kinetic tests, it is shown that the decreased number of active sites is responsible for the declined SCR activity at low temperature. As Cu/SSZ-13 catalysts show excellent acid-resistance ability, our study reveals that the Cu/SSZ-13 catalyst is a good candidate for NO x elimination, especially when SO 3 exists.

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Section: Bet and Xrd Resultssupporting

confidence: 91%

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

et al. 2019

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“…The current understanding of Cu-zeolite catalyst deactivation by SO2, and Cu-CHA in particular, is that it originates from SO2 interaction with the Cu-sites. This can simply be adsorption of SO2 or could involve a chemical reaction between the SO2 and Cu-sites [2,[5][6][7][8][9][10][11][12][13]. X-ray photoemission and X-ray absorption spectroscopy indicate that the Cu in the ion-exchange positions reacts to form a CuSO4-like species [2].…”

Section: A C C E P T E D Mmentioning

confidence: 99%

“…The presence of SO2 or SO3 in a standard, NH3containing SCR-gas causes formation of ammonium sulfate, which is a solid below 300 C, and therefore, deactivation by ammonium sulfate only occurs in the low-temperature range. Ammonium sulfate can be removed by heating the catalyst to above 350 C, which means that regeneration from this type of deactivation is possible in an exhaust system [5,9,10].…”

Section: A C C E P T E D Mmentioning

confidence: 99%

Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3

Hammershøi

Jangjou

Epling

et al. 2018

Applied Catalysis B: Environmental

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“…Therefore, we can conclude that desorption peaks below 400°C originate from Brønsted acid sites; otherwise, the peaks can be attributed to Lewis acid sites. [56][57][58] Whether Lewis acid sites or Brønsted acid sites play a primary role in SCR reactions is correlated with catalysts. All of the catalysts had with similar desorption peaks in our TPD profiles, while the peaks positions and areas were different.…”

Section: Resultsmentioning

confidence: 99%

“…The peaks observed at 361°C could be ascribed to the reduction of MnO 2 to Mn 2 O 3 , and those observed at 480°C represented the combined reduction of Mn 2 O 3 to Mn 3 O 4 and of Eu 2 O 3 to EuO. [56][57][58] Whether Lewis acid sites or Brønsted acid sites play a primary role in SCR reactions is correlated with catalysts. It is widely accepted that lower reduction temperatures denoted to stronger redox properties.…”

Section: Xpsmentioning

confidence: 99%

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

et al. 2019

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Novel MnÀ EuÀ Fe catalysts were prepared via co-precipitation method for NO x removal by selective catalytic reduction with NH 3 (NH 3 À SCR). The MnÀ EuÀ Fe(1)-500 catalyst possessed the highest level of low-temperature activity, giving 98 % NO conversion at 100°C. This catalyst also exhibited excellent H 2 O resistance capacity, even at a high gas hourly space velocity (GHSV) of 75,000 h À 1 . The NO conversion still maintained at approximately 90 % in the presence of 15 % H 2 O at 230°C after 50 h, and the adverse effects of H 2 O could be quickly eliminated after the removal of H 2 O. Detailed characterization and analysis indicated that strong interactions among Mn, Eu and Fe resulted in the excellent low-temperature SCR activity and H 2 O resistance of the MnÀ EuÀ Fe(1)-500 catalyst. The strong interactions lead to larger specific surface area, higher concentrations of Mn 4 + , Fe 3 + and O α ; improved redox properties, increased acid sites and acid strength, and more adsorption amounts of NO/NH 3 in the presence of H 2 O. The MnÀ EuÀ Fe(1)-500 catalyst is a potential future catalyst for low-temperature NO x removal derived from high-H 2 O-content flue gases of natural gas combustion.

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Effect of SO₂ on NH₃ oxidation over a Cu-SAPO-34 SCR catalyst

Abstract: The impact of SO2 on NH3 oxidation, an undesired side reaction that can occur during NH3-SCR, was studied using Cu-SAPO-34.

Cited by 40 publications

References 20 publications

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR

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Effect of SO2 on NH3 oxidation over a Cu-SAPO-34 SCR catalyst

Abstract: The impact of SO2 on NH3 oxidation, an undesired side reaction that can occur during NH3-SCR, was studied using Cu-SAPO-34.

Cited by 40 publications

References 20 publications

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

The Role of SO3 Poisoning in CU/SSZ-13 NH3-SCR Catalysts

Reversible and irreversible deactivation of Cu-CHA NH3-SCRcatalysts by SO2 and SO3

Improved Low‐Temperature Activity and H2O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH3−SCR

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Effect of SO₂ on NH₃ oxidation over a Cu-SAPO-34 SCR catalyst

Improved Low‐Temperature Activity and H₂O Resistance of Fe‐Doped Mn−Eu Catalysts for NO Removal by NH₃−SCR