Citation: SHU Yun, ZHANG Fan, WANG Hong-chang, ZHU Jin-wei. Influence of SO₂ and H₂O on the selective catalytic reduction of NO_x over CeO₂/TiO₂/cordierite catalyst[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(9): 1111-1118. shu

Influence of SO₂ and H₂O on the selective catalytic reduction of NO_x over CeO₂/TiO₂/cordierite catalyst

1.
Research Center of Air Pollution Control Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Corresponding author: ZHANG Fan,
Received Date: 11 April 2014
Available Online: 13 June 2014
Fund Project: 国家自然科学基金(2012AA062505) (2012AA062505)中央级公益性科研院所基本科研业务专项(2013-YSKY-01)。 (2013-YSKY-01)

A monolithic CeO₂/TiO₂/cordierite deNO_x catalyst was prepared by an impregnation method, with cordierite as the substrate and CeO₂ as the active component. The CeO₂/TiO₂/cordierite catalyst exhibits excellent resistance against SO₂ and H₂O in the selective catalytic reduction (SCR) of NO_x with NH₃, compared with the commercial vanadium-based catalyst (V₂O₅-WO₃/TiO₂/cordierite); the CeO₂/TiO₂/cordierite catalyst gives a conversion of NO_x above 70% after 30 h resistance test against SO₂+H₂O, only declined by 5%. BET, XRD, FT-IR and TG results indicated that ammonium sulfate is formed on the surface of both CeO₂/TiO₂/cordierite and V₂O₅-WO₃/TiO₂/cordierite catalysts during the SCR reaction in the presence of SO₂ and H₂O, but on the former, the amount of ammonium sulfate deposited is much less. NH₃-DRIFT results suggested that the surface Brønsted acidity is strengthened, whereas the surface Lewis acidity is weakened during the SCR reaction in the presence of SO₂ and H₂O. XPS results further displayed that SO₂+H₂O in flue gas may induce a reduction of Ce from Ce⁴⁺ to Ce³⁺ on CeO₂/TiO₂/cordierite catalyst, resulting in an increase of the chemisorbed oxygen amount, which contributes to the excellent resistance of the CeO₂/TiO₂/cordierite catalyst against SO₂ and H₂O during the SCR reaction.
- CeO₂,
- TiO₂,
- cordierite,
- denitration,
- selective catalytic reduction of NO_x,
- SO₂ and H₂O resistance
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沈阳化工大学材料科学与工程学院沈阳 110142

Influence of SO2 and H2O on the selective catalytic reduction of NOx over CeO2/TiO2/cordierite catalyst

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Influence of SO₂ and H₂O on the selective catalytic reduction of NO_x over CeO₂/TiO₂/cordierite catalyst