Improved NO_x Reduction in the Presence of SO₂ by Using Fe₂O₃-Promoted Halloysite-Supported CeO₂–WO₃ Catalysts

Currently, selective catalytic reduction (SCR) of NOx with NH3 in the presence of SO2 by using vanadium-free catalysts is still an important issue for the removal of NOx for stationary sources. Developing high-performance catalysts for NOx reduction in the presence of SO2 is a significant challenge. In this work, a series of Fe2O3-promoted halloysite-supported CeO2–WO3 catalysts were synthesized by a molten salt treatment followed by the...