Submonolayer Mo-decorated V2O5–WO3/TiO2 provides abundant vanadia species and unsaturated V4+ species, accelerating the acid and redox cycling of low-temperature NH3-SCR.
Developing low-temperature (<300
°C) SO2-tolerant
catalysts for NO
x
reduction is a challenge.
A catalyst architecture of three-dimensional (3D) ordered mesoporous
CeO2 supported by submonolayer V2O5 and MnO2 (V2O5–MnO2/3D-CeO2) was successfully prepared to promote the SO2 resistance in low-temperature selective catalytic reduction
(SCR). The 3D ordered mesoporous channels were retained even after
the exposure of the catalyst to SO2 and H2O.
The presence of a highly 3D ordered mesoporous structure of V2O5–MnO2/3D-CeO2 can
lead to high vapor pressure, which was beneficial for ammonium bisulfate
vaporization and decomposition, eventually protecting the active vanadia
sites. The stable active crystalline V2O5 species
and the formative cerium sulfate promoters were crucial for determining
the low-temperature SCR activity and SO2 tolerance in the
presence of SO2 and H2O. Therefore, our V2O5–MnO2/3D-CeO2 catalyst
delivered a large temperature range of 250–320 °C with
NO conversion above 95%. The 3D ordered mesoporous channels of the
V2O5–MnO2/3D-CeO2 catalyst provided an effective way to improve the SO2 resistance at 250 °C.
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